diff --git a/01.SQLite-Single-Table-CRUD/app/build.gradle b/01.SQLite-Single-Table-CRUD/app/build.gradle
index 2b098dc..5ec2207 100644
--- a/01.SQLite-Single-Table-CRUD/app/build.gradle
+++ b/01.SQLite-Single-Table-CRUD/app/build.gradle
@@ -1,15 +1,14 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 27
-    buildToolsVersion '27.0.3'
+    compileSdkVersion 28
     defaultConfig {
         applicationId "com.hellohasan.sqlite_project"
         minSdkVersion 15
-        targetSdkVersion 27
+        targetSdkVersion 28
         versionCode 1
         versionName "1.0"
-        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }
     buildTypes {
         release {
@@ -21,15 +20,15 @@ android {
 
 dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
-    androidTestImplementation('com.android.support.test.espresso:espresso-core:2.2.2', {
+    androidTestImplementation('androidx.test.espresso:espresso-core:3.1.0', {
         exclude group: 'com.android.support', module: 'support-annotations'
     })
-    implementation 'com.android.support:appcompat-v7:27.1.1'
-    implementation 'com.android.support.constraint:constraint-layout:1.1.2'
-    implementation 'com.android.support:design:27.1.1'
-    implementation 'com.android.support:support-v4:27.1.1'
+    implementation 'androidx.appcompat:appcompat:1.1.0'
+    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
+    implementation 'com.google.android.material:material:1.0.0'
+    implementation 'androidx.legacy:legacy-support-v4:1.0.0'
     implementation 'com.orhanobut:logger:2.2.0'
-    implementation 'com.android.support:cardview-v7:27.1.1'
-    implementation 'com.android.support:recyclerview-v7:27.1.1'
+    implementation 'androidx.cardview:cardview:1.0.0'
+    implementation 'androidx.recyclerview:recyclerview:1.0.0'
     testImplementation 'junit:junit:4.12'
 }
diff --git a/01.SQLite-Single-Table-CRUD/app/src/androidTest/java/com/hellohasan/sqlite_project/ExampleInstrumentedTest.java b/01.SQLite-Single-Table-CRUD/app/src/androidTest/java/com/hellohasan/sqlite_project/ExampleInstrumentedTest.java
index 5cd0563..1298a67 100644
--- a/01.SQLite-Single-Table-CRUD/app/src/androidTest/java/com/hellohasan/sqlite_project/ExampleInstrumentedTest.java
+++ b/01.SQLite-Single-Table-CRUD/app/src/androidTest/java/com/hellohasan/sqlite_project/ExampleInstrumentedTest.java
@@ -1,8 +1,8 @@
 package com.hellohasan.sqlite_project;
 
 import android.content.Context;
-import android.support.test.InstrumentationRegistry;
-import android.support.test.runner.AndroidJUnit4;
+import androidx.test.platform.app.InstrumentationRegistry;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
 
 import org.junit.Test;
 import org.junit.runner.RunWith;
diff --git a/01.SQLite-Single-Table-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/CreateStudent/StudentCreateDialogFragment.java b/01.SQLite-Single-Table-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/CreateStudent/StudentCreateDialogFragment.java
index 0af194c..548b42d 100644
--- a/01.SQLite-Single-Table-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/CreateStudent/StudentCreateDialogFragment.java
+++ b/01.SQLite-Single-Table-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/CreateStudent/StudentCreateDialogFragment.java
@@ -2,7 +2,7 @@
 
 import android.app.Dialog;
 import android.os.Bundle;
-import android.support.v4.app.DialogFragment;
+import androidx.fragment.app.DialogFragment;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
diff --git a/01.SQLite-Single-Table-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/ShowStudentList/CustomViewHolder.java b/01.SQLite-Single-Table-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/ShowStudentList/CustomViewHolder.java
index b788800..2136a1c 100644
--- a/01.SQLite-Single-Table-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/ShowStudentList/CustomViewHolder.java
+++ b/01.SQLite-Single-Table-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/ShowStudentList/CustomViewHolder.java
@@ -1,6 +1,6 @@
 package com.hellohasan.sqlite_project.Features.ShowStudentList;
 
-import android.support.v7.widget.RecyclerView;
+import androidx.recyclerview.widget.RecyclerView;
 import android.view.View;
 import android.widget.ImageView;
 import android.widget.TextView;
diff --git a/01.SQLite-Single-Table-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/ShowStudentList/StudentListActivity.java b/01.SQLite-Single-Table-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/ShowStudentList/StudentListActivity.java
index fd7b604..d589600 100644
--- a/01.SQLite-Single-Table-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/ShowStudentList/StudentListActivity.java
+++ b/01.SQLite-Single-Table-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/ShowStudentList/StudentListActivity.java
@@ -2,12 +2,12 @@
 
 import android.content.DialogInterface;
 import android.os.Bundle;
-import android.support.design.widget.FloatingActionButton;
-import android.support.v7.app.AlertDialog;
-import android.support.v7.app.AppCompatActivity;
-import android.support.v7.widget.LinearLayoutManager;
-import android.support.v7.widget.RecyclerView;
-import android.support.v7.widget.Toolbar;
+import com.google.android.material.floatingactionbutton.FloatingActionButton;
+import androidx.appcompat.app.AlertDialog;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.recyclerview.widget.LinearLayoutManager;
+import androidx.recyclerview.widget.RecyclerView;
+import androidx.appcompat.widget.Toolbar;
 import android.view.Menu;
 import android.view.MenuInflater;
 import android.view.MenuItem;
diff --git a/01.SQLite-Single-Table-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/ShowStudentList/StudentListRecyclerViewAdapter.java b/01.SQLite-Single-Table-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/ShowStudentList/StudentListRecyclerViewAdapter.java
index 4ae2172..8b03116 100644
--- a/01.SQLite-Single-Table-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/ShowStudentList/StudentListRecyclerViewAdapter.java
+++ b/01.SQLite-Single-Table-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/ShowStudentList/StudentListRecyclerViewAdapter.java
@@ -2,8 +2,8 @@
 
 import android.content.Context;
 import android.content.DialogInterface;
-import android.support.v7.app.AlertDialog;
-import android.support.v7.widget.RecyclerView;
+import androidx.appcompat.app.AlertDialog;
+import androidx.recyclerview.widget.RecyclerView;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
diff --git a/01.SQLite-Single-Table-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/UpdateStudentInfo/StudentUpdateDialogFragment.java b/01.SQLite-Single-Table-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/UpdateStudentInfo/StudentUpdateDialogFragment.java
index d3cca1f..e6b1221 100644
--- a/01.SQLite-Single-Table-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/UpdateStudentInfo/StudentUpdateDialogFragment.java
+++ b/01.SQLite-Single-Table-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/UpdateStudentInfo/StudentUpdateDialogFragment.java
@@ -2,7 +2,7 @@
 
 import android.app.Dialog;
 import android.os.Bundle;
-import android.support.v4.app.DialogFragment;
+import androidx.fragment.app.DialogFragment;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
diff --git a/01.SQLite-Single-Table-CRUD/app/src/main/res/layout/activity_student_list.xml b/01.SQLite-Single-Table-CRUD/app/src/main/res/layout/activity_student_list.xml
index 57f811c..f81b844 100644
--- a/01.SQLite-Single-Table-CRUD/app/src/main/res/layout/activity_student_list.xml
+++ b/01.SQLite-Single-Table-CRUD/app/src/main/res/layout/activity_student_list.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
@@ -7,23 +7,23 @@
     android:background="@color/light_shadow"
     tools:context=".Features.ShowStudentList.StudentListActivity">
 
-    <android.support.design.widget.AppBarLayout
+    <com.google.android.material.appbar.AppBarLayout
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:theme="@style/AppTheme.AppBarOverlay">
 
-        <android.support.v7.widget.Toolbar
+        <androidx.appcompat.widget.Toolbar
             android:id="@+id/toolbar"
             android:layout_width="match_parent"
             android:layout_height="?attr/actionBarSize"
             android:background="?attr/colorPrimary"
             app:popupTheme="@style/AppTheme.PopupOverlay" />
 
-    </android.support.design.widget.AppBarLayout>
+    </com.google.android.material.appbar.AppBarLayout>
 
     <include layout="@layout/content_main" />
 
-    <android.support.design.widget.FloatingActionButton
+    <com.google.android.material.floatingactionbutton.FloatingActionButton
         android:id="@+id/fab"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
@@ -31,4 +31,4 @@
         android:layout_margin="@dimen/fab_margin"
         app:srcCompat="@drawable/ic_person_add_white_24dp" />
 
-</android.support.design.widget.CoordinatorLayout>
+</androidx.coordinatorlayout.widget.CoordinatorLayout>
diff --git a/01.SQLite-Single-Table-CRUD/app/src/main/res/layout/content_main.xml b/01.SQLite-Single-Table-CRUD/app/src/main/res/layout/content_main.xml
index 5a6f13e..e11dd51 100644
--- a/01.SQLite-Single-Table-CRUD/app/src/main/res/layout/content_main.xml
+++ b/01.SQLite-Single-Table-CRUD/app/src/main/res/layout/content_main.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
@@ -9,7 +9,7 @@
     tools:showIn="@layout/activity_student_list"
     android:layout_marginBottom="8dp">
 
-    <android.support.v7.widget.RecyclerView
+    <androidx.recyclerview.widget.RecyclerView
         android:id="@+id/studentRecyclerView"
         android:layout_width="0dp"
         android:layout_height="wrap_content"
@@ -17,7 +17,7 @@
         app:layout_constraintLeft_toLeftOf="parent"
         app:layout_constraintRight_toRightOf="parent">
 
-    </android.support.v7.widget.RecyclerView>
+    </androidx.recyclerview.widget.RecyclerView>
 
     <TextView
         android:id="@+id/emptyStudentListTextView"
@@ -31,4 +31,4 @@
         app:layout_constraintRight_toRightOf="parent"
         app:layout_constraintTop_toTopOf="parent" />
 
-</android.support.constraint.ConstraintLayout>
+</androidx.constraintlayout.widget.ConstraintLayout>
diff --git a/01.SQLite-Single-Table-CRUD/app/src/main/res/layout/fragment_student_create_dialog.xml b/01.SQLite-Single-Table-CRUD/app/src/main/res/layout/fragment_student_create_dialog.xml
index cc9b4dd..1be5775 100644
--- a/01.SQLite-Single-Table-CRUD/app/src/main/res/layout/fragment_student_create_dialog.xml
+++ b/01.SQLite-Single-Table-CRUD/app/src/main/res/layout/fragment_student_create_dialog.xml
@@ -1,4 +1,4 @@
-<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
@@ -64,4 +64,4 @@
         app:layout_constraintLeft_toRightOf="@+id/createButton"
         android:text="@string/cancel_button"/>
 
-</android.support.constraint.ConstraintLayout>
+</androidx.constraintlayout.widget.ConstraintLayout>
diff --git a/01.SQLite-Single-Table-CRUD/app/src/main/res/layout/fragment_student_update_dialog.xml b/01.SQLite-Single-Table-CRUD/app/src/main/res/layout/fragment_student_update_dialog.xml
index 794a8db..bf5ceb8 100644
--- a/01.SQLite-Single-Table-CRUD/app/src/main/res/layout/fragment_student_update_dialog.xml
+++ b/01.SQLite-Single-Table-CRUD/app/src/main/res/layout/fragment_student_update_dialog.xml
@@ -1,4 +1,4 @@
-<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
@@ -61,7 +61,7 @@
         android:layout_height="wrap_content"
         app:layout_constraintTop_toBottomOf="@+id/emailEditText"
         app:layout_constraintRight_toRightOf="parent"
-        app:layout_constraintLeft_toRightOf="@+id/createButton"
+        app:layout_constraintLeft_toRightOf="@+id/updateStudentInfoButton"
         android:text="@string/cancel_button"/>
 
-</android.support.constraint.ConstraintLayout>
+</androidx.constraintlayout.widget.ConstraintLayout>
diff --git a/01.SQLite-Single-Table-CRUD/app/src/main/res/layout/student_info.xml b/01.SQLite-Single-Table-CRUD/app/src/main/res/layout/student_info.xml
index 00d157a..8e2ad1d 100644
--- a/01.SQLite-Single-Table-CRUD/app/src/main/res/layout/student_info.xml
+++ b/01.SQLite-Single-Table-CRUD/app/src/main/res/layout/student_info.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     xmlns:app="http://schemas.android.com/apk/res-auto"
@@ -11,6 +11,8 @@
         android:layout_height="wrap_content"
         android:text="Student Information"
         android:textColor="@color/colorPrimary"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintLeft_toLeftOf="parent"
         android:textSize="18sp"/>
 
     <View
@@ -76,4 +78,4 @@
         app:layout_constraintRight_toRightOf="parent"
         android:text="Update"/>
 
-</android.support.constraint.ConstraintLayout>
\ No newline at end of file
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/01.SQLite-Single-Table-CRUD/app/src/main/res/layout/student_item.xml b/01.SQLite-Single-Table-CRUD/app/src/main/res/layout/student_item.xml
index 5e6b876..391bf45 100644
--- a/01.SQLite-Single-Table-CRUD/app/src/main/res/layout/student_item.xml
+++ b/01.SQLite-Single-Table-CRUD/app/src/main/res/layout/student_item.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     xmlns:app="http://schemas.android.com/apk/res-auto"
@@ -101,4 +101,4 @@
         android:layout_marginStart="4dp"
         android:layout_marginLeft="4dp"/>
 
-</android.support.constraint.ConstraintLayout>
\ No newline at end of file
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/01.SQLite-Single-Table-CRUD/build.gradle b/01.SQLite-Single-Table-CRUD/build.gradle
index ad6a928..3117577 100644
--- a/01.SQLite-Single-Table-CRUD/build.gradle
+++ b/01.SQLite-Single-Table-CRUD/build.gradle
@@ -6,7 +6,7 @@ buildscript {
         google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.1.3'
+        classpath 'com.android.tools.build:gradle:3.5.1'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
diff --git a/01.SQLite-Single-Table-CRUD/gradle.properties b/01.SQLite-Single-Table-CRUD/gradle.properties
index aac7c9b..9e6fce1 100644
--- a/01.SQLite-Single-Table-CRUD/gradle.properties
+++ b/01.SQLite-Single-Table-CRUD/gradle.properties
@@ -9,6 +9,8 @@
 
 # Specifies the JVM arguments used for the daemon process.
 # The setting is particularly useful for tweaking memory settings.
+android.enableJetifier=true
+android.useAndroidX=true
 org.gradle.jvmargs=-Xmx1536m
 
 # When configured, Gradle will run in incubating parallel mode.
diff --git a/01.SQLite-Single-Table-CRUD/gradle/wrapper/gradle-wrapper.properties b/01.SQLite-Single-Table-CRUD/gradle/wrapper/gradle-wrapper.properties
index 278830f..0b70111 100644
--- a/01.SQLite-Single-Table-CRUD/gradle/wrapper/gradle-wrapper.properties
+++ b/01.SQLite-Single-Table-CRUD/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
-#Wed Jun 27 16:11:27 BDT 2018
+#Thu Oct 31 11:10:54 BDT 2019
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.4-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.4.1-all.zip
diff --git a/02.SQLite-Multiple-(Two)-Tables-CRUD/app/build.gradle b/02.SQLite-Multiple-(Two)-Tables-CRUD/app/build.gradle
index 87149c1..ea1cc0d 100644
--- a/02.SQLite-Multiple-(Two)-Tables-CRUD/app/build.gradle
+++ b/02.SQLite-Multiple-(Two)-Tables-CRUD/app/build.gradle
@@ -1,15 +1,14 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 26
-    buildToolsVersion '27.0.3'
+    compileSdkVersion 28
     defaultConfig {
         applicationId "com.hellohasan.sqlite_project"
-        minSdkVersion 15
-        targetSdkVersion 26
+        minSdkVersion 19
+        targetSdkVersion 28
         versionCode 1
         versionName "1.0"
-        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         vectorDrawables.useSupportLibrary = true
     }
     buildTypes {
@@ -22,15 +21,15 @@ android {
 
 dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
-    androidTestImplementation('com.android.support.test.espresso:espresso-core:2.2.2', {
+    androidTestImplementation('androidx.test.espresso:espresso-core:3.1.0', {
         exclude group: 'com.android.support', module: 'support-annotations'
     })
-    implementation 'com.android.support:appcompat-v7:26.1.0'
-    implementation 'com.android.support.constraint:constraint-layout:1.0.2'
-    implementation 'com.android.support:design:26.1.0'
-    implementation 'com.android.support:support-v4:26.1.0'
-    implementation 'com.orhanobut:logger:2.1.1'
-    implementation 'com.android.support:cardview-v7:26.1.0'
-    implementation 'com.android.support:recyclerview-v7:26.1.0'
+    implementation 'androidx.appcompat:appcompat:1.1.0'
+    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
+    implementation 'com.google.android.material:material:1.0.0'
+    implementation 'androidx.legacy:legacy-support-v4:1.0.0'
+    implementation 'com.orhanobut:logger:2.2.0'
+    implementation 'androidx.cardview:cardview:1.0.0'
+    implementation 'androidx.recyclerview:recyclerview:1.0.0'
     testImplementation 'junit:junit:4.12'
 }
diff --git a/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/androidTest/java/com/hellohasan/sqlite_project/ExampleInstrumentedTest.java b/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/androidTest/java/com/hellohasan/sqlite_project/ExampleInstrumentedTest.java
index 5cd0563..1298a67 100644
--- a/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/androidTest/java/com/hellohasan/sqlite_project/ExampleInstrumentedTest.java
+++ b/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/androidTest/java/com/hellohasan/sqlite_project/ExampleInstrumentedTest.java
@@ -1,8 +1,8 @@
 package com.hellohasan.sqlite_project;
 
 import android.content.Context;
-import android.support.test.InstrumentationRegistry;
-import android.support.test.runner.AndroidJUnit4;
+import androidx.test.platform.app.InstrumentationRegistry;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
 
 import org.junit.Test;
 import org.junit.runner.RunWith;
diff --git a/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/StudentCRUD/CreateStudent/StudentCreateDialogFragment.java b/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/StudentCRUD/CreateStudent/StudentCreateDialogFragment.java
index fbe42ec..5a4cd3a 100644
--- a/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/StudentCRUD/CreateStudent/StudentCreateDialogFragment.java
+++ b/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/StudentCRUD/CreateStudent/StudentCreateDialogFragment.java
@@ -2,7 +2,7 @@
 
 import android.app.Dialog;
 import android.os.Bundle;
-import android.support.v4.app.DialogFragment;
+import androidx.fragment.app.DialogFragment;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
diff --git a/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/StudentCRUD/ShowStudentList/CustomViewHolder.java b/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/StudentCRUD/ShowStudentList/CustomViewHolder.java
index 04723d1..f143236 100644
--- a/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/StudentCRUD/ShowStudentList/CustomViewHolder.java
+++ b/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/StudentCRUD/ShowStudentList/CustomViewHolder.java
@@ -1,6 +1,6 @@
 package com.hellohasan.sqlite_project.Features.StudentCRUD.ShowStudentList;
 
-import android.support.v7.widget.RecyclerView;
+import androidx.recyclerview.widget.RecyclerView;
 import android.view.View;
 import android.widget.ImageView;
 import android.widget.TextView;
diff --git a/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/StudentCRUD/ShowStudentList/StudentListActivity.java b/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/StudentCRUD/ShowStudentList/StudentListActivity.java
index 4844721..bed33d8 100644
--- a/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/StudentCRUD/ShowStudentList/StudentListActivity.java
+++ b/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/StudentCRUD/ShowStudentList/StudentListActivity.java
@@ -2,12 +2,12 @@
 
 import android.content.DialogInterface;
 import android.os.Bundle;
-import android.support.design.widget.FloatingActionButton;
-import android.support.v7.app.AlertDialog;
-import android.support.v7.app.AppCompatActivity;
-import android.support.v7.widget.LinearLayoutManager;
-import android.support.v7.widget.RecyclerView;
-import android.support.v7.widget.Toolbar;
+import com.google.android.material.floatingactionbutton.FloatingActionButton;
+import androidx.appcompat.app.AlertDialog;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.recyclerview.widget.LinearLayoutManager;
+import androidx.recyclerview.widget.RecyclerView;
+import androidx.appcompat.widget.Toolbar;
 import android.view.Menu;
 import android.view.MenuInflater;
 import android.view.MenuItem;
diff --git a/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/StudentCRUD/ShowStudentList/StudentListRecyclerViewAdapter.java b/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/StudentCRUD/ShowStudentList/StudentListRecyclerViewAdapter.java
index 7195301..85db12d 100644
--- a/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/StudentCRUD/ShowStudentList/StudentListRecyclerViewAdapter.java
+++ b/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/StudentCRUD/ShowStudentList/StudentListRecyclerViewAdapter.java
@@ -3,8 +3,8 @@
 import android.content.Context;
 import android.content.DialogInterface;
 import android.content.Intent;
-import android.support.v7.app.AlertDialog;
-import android.support.v7.widget.RecyclerView;
+import androidx.appcompat.app.AlertDialog;
+import androidx.recyclerview.widget.RecyclerView;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
diff --git a/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/StudentCRUD/UpdateStudentInfo/StudentUpdateDialogFragment.java b/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/StudentCRUD/UpdateStudentInfo/StudentUpdateDialogFragment.java
index 6783244..629e112 100644
--- a/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/StudentCRUD/UpdateStudentInfo/StudentUpdateDialogFragment.java
+++ b/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/StudentCRUD/UpdateStudentInfo/StudentUpdateDialogFragment.java
@@ -2,7 +2,7 @@
 
 import android.app.Dialog;
 import android.os.Bundle;
-import android.support.v4.app.DialogFragment;
+import androidx.fragment.app.DialogFragment;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
diff --git a/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/SubjectCRUD/CreateSubject/SubjectCreateDialogFragment.java b/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/SubjectCRUD/CreateSubject/SubjectCreateDialogFragment.java
index 3ebd172..7a6c8b9 100644
--- a/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/SubjectCRUD/CreateSubject/SubjectCreateDialogFragment.java
+++ b/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/SubjectCRUD/CreateSubject/SubjectCreateDialogFragment.java
@@ -3,7 +3,7 @@
 
 import android.app.Dialog;
 import android.os.Bundle;
-import android.support.v4.app.DialogFragment;
+import androidx.fragment.app.DialogFragment;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
diff --git a/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/SubjectCRUD/ShowSubjectList/CustomViewHolder.java b/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/SubjectCRUD/ShowSubjectList/CustomViewHolder.java
index 09a2ae9..616e4c1 100644
--- a/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/SubjectCRUD/ShowSubjectList/CustomViewHolder.java
+++ b/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/SubjectCRUD/ShowSubjectList/CustomViewHolder.java
@@ -1,6 +1,6 @@
 package com.hellohasan.sqlite_project.Features.SubjectCRUD.ShowSubjectList;
 
-import android.support.v7.widget.RecyclerView;
+import androidx.recyclerview.widget.RecyclerView;
 import android.view.View;
 import android.widget.ImageView;
 import android.widget.TextView;
diff --git a/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/SubjectCRUD/ShowSubjectList/SubjectListActivity.java b/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/SubjectCRUD/ShowSubjectList/SubjectListActivity.java
index d95f3b2..f020145 100644
--- a/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/SubjectCRUD/ShowSubjectList/SubjectListActivity.java
+++ b/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/SubjectCRUD/ShowSubjectList/SubjectListActivity.java
@@ -2,12 +2,12 @@
 
 import android.content.DialogInterface;
 import android.os.Bundle;
-import android.support.design.widget.FloatingActionButton;
-import android.support.v7.app.AlertDialog;
-import android.support.v7.app.AppCompatActivity;
-import android.support.v7.widget.LinearLayoutManager;
-import android.support.v7.widget.RecyclerView;
-import android.support.v7.widget.Toolbar;
+import com.google.android.material.floatingactionbutton.FloatingActionButton;
+import androidx.appcompat.app.AlertDialog;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.recyclerview.widget.LinearLayoutManager;
+import androidx.recyclerview.widget.RecyclerView;
+import androidx.appcompat.widget.Toolbar;
 import android.view.Menu;
 import android.view.MenuInflater;
 import android.view.MenuItem;
diff --git a/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/SubjectCRUD/ShowSubjectList/SubjectListRecyclerViewAdapter.java b/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/SubjectCRUD/ShowSubjectList/SubjectListRecyclerViewAdapter.java
index f58c3fd..4dcd499 100644
--- a/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/SubjectCRUD/ShowSubjectList/SubjectListRecyclerViewAdapter.java
+++ b/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/SubjectCRUD/ShowSubjectList/SubjectListRecyclerViewAdapter.java
@@ -2,8 +2,8 @@
 
 import android.content.Context;
 import android.content.DialogInterface;
-import android.support.v7.app.AlertDialog;
-import android.support.v7.widget.RecyclerView;
+import androidx.appcompat.app.AlertDialog;
+import androidx.recyclerview.widget.RecyclerView;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
diff --git a/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/SubjectCRUD/UpdateSubjectInfo/SubjectUpdateDialogFragment.java b/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/SubjectCRUD/UpdateSubjectInfo/SubjectUpdateDialogFragment.java
index 12c443c..10c2d56 100644
--- a/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/SubjectCRUD/UpdateSubjectInfo/SubjectUpdateDialogFragment.java
+++ b/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_project/Features/SubjectCRUD/UpdateSubjectInfo/SubjectUpdateDialogFragment.java
@@ -3,7 +3,7 @@
 
 import android.app.Dialog;
 import android.os.Bundle;
-import android.support.v4.app.DialogFragment;
+import androidx.fragment.app.DialogFragment;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -43,7 +43,7 @@ public static SubjectUpdateDialogFragment newInstance(long subId, int pos, Subje
         args.putString("title", "Update subject information");
         subjectUpdateDialogFragment.setArguments(args);
 
-        subjectUpdateDialogFragment.setStyle(android.support.v4.app.DialogFragment.STYLE_NORMAL, R.style.CustomDialog);
+        subjectUpdateDialogFragment.setStyle(DialogFragment.STYLE_NORMAL, R.style.CustomDialog);
 
         return subjectUpdateDialogFragment;
     }
diff --git a/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/res/layout/activity_student_list.xml b/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/res/layout/activity_student_list.xml
index 2f610b8..2767472 100644
--- a/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/res/layout/activity_student_list.xml
+++ b/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/res/layout/activity_student_list.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
@@ -7,12 +7,12 @@
     android:background="@color/light_shadow"
     tools:context=".Features.StudentCRUD.ShowStudentList.StudentListActivity">
 
-    <android.support.design.widget.AppBarLayout
+    <com.google.android.material.appbar.AppBarLayout
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:theme="@style/AppTheme.AppBarOverlay">
 
-        <android.support.v7.widget.Toolbar
+        <androidx.appcompat.widget.Toolbar
             android:id="@+id/toolbar"
             android:layout_width="match_parent"
             android:layout_height="?attr/actionBarSize"
@@ -20,11 +20,11 @@
             app:popupTheme="@style/AppTheme.PopupOverlay"
             app:title="@string/student_list"/>
 
-    </android.support.design.widget.AppBarLayout>
+    </com.google.android.material.appbar.AppBarLayout>
 
     <include layout="@layout/content_main" />
 
-    <android.support.design.widget.FloatingActionButton
+    <com.google.android.material.floatingactionbutton.FloatingActionButton
         android:id="@+id/fab"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
@@ -32,4 +32,4 @@
         android:layout_margin="@dimen/fab_margin"
         app:srcCompat="@drawable/ic_person_add_white_24dp" />
 
-</android.support.design.widget.CoordinatorLayout>
+</androidx.coordinatorlayout.widget.CoordinatorLayout>
diff --git a/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/res/layout/activity_subject_list.xml b/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/res/layout/activity_subject_list.xml
index 1d5ee66..7b966d8 100644
--- a/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/res/layout/activity_subject_list.xml
+++ b/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/res/layout/activity_subject_list.xml
@@ -1,17 +1,17 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     tools:context="com.hellohasan.sqlite_project.Features.SubjectCRUD.ShowSubjectList.SubjectListActivity">
 
-    <android.support.design.widget.AppBarLayout
+    <com.google.android.material.appbar.AppBarLayout
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:theme="@style/AppTheme.AppBarOverlay">
 
-        <android.support.v7.widget.Toolbar
+        <androidx.appcompat.widget.Toolbar
             android:id="@+id/toolbar"
             android:layout_width="match_parent"
             android:layout_height="?attr/actionBarSize"
@@ -19,11 +19,11 @@
             app:popupTheme="@style/AppTheme.PopupOverlay"
             app:title="@string/subject_list"/>
 
-    </android.support.design.widget.AppBarLayout>
+    </com.google.android.material.appbar.AppBarLayout>
 
     <include layout="@layout/content_main" />
 
-    <android.support.design.widget.FloatingActionButton
+    <com.google.android.material.floatingactionbutton.FloatingActionButton
         android:id="@+id/fab"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
@@ -31,4 +31,4 @@
         android:layout_margin="@dimen/fab_margin"
         app:srcCompat="@drawable/ic_subject_add_24dp" />
 
-</android.support.design.widget.CoordinatorLayout>
+</androidx.coordinatorlayout.widget.CoordinatorLayout>
diff --git a/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/res/layout/content_main.xml b/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/res/layout/content_main.xml
index e3b7e55..529cfa8 100644
--- a/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/res/layout/content_main.xml
+++ b/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/res/layout/content_main.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
@@ -13,10 +13,12 @@
         android:id="@+id/summaryTextView"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintLeft_toLeftOf="parent"
         android:text="@string/database_summary"
         android:padding="8dp"/>
 
-    <android.support.v7.widget.RecyclerView
+    <androidx.recyclerview.widget.RecyclerView
         android:id="@+id/recyclerView"
         android:layout_width="0dp"
         android:layout_height="wrap_content"
@@ -25,7 +27,7 @@
         app:layout_constraintRight_toRightOf="parent"
         android:layout_marginTop="16dp">
 
-    </android.support.v7.widget.RecyclerView>
+    </androidx.recyclerview.widget.RecyclerView>
 
     <TextView
         android:id="@+id/emptyListTextView"
@@ -39,4 +41,4 @@
         app:layout_constraintRight_toRightOf="parent"
         app:layout_constraintTop_toTopOf="parent" />
 
-</android.support.constraint.ConstraintLayout>
+</androidx.constraintlayout.widget.ConstraintLayout>
diff --git a/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/res/layout/fragment_student_create_dialog.xml b/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/res/layout/fragment_student_create_dialog.xml
index 38308a7..fe2b670 100644
--- a/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/res/layout/fragment_student_create_dialog.xml
+++ b/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/res/layout/fragment_student_create_dialog.xml
@@ -1,4 +1,4 @@
-<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
@@ -64,4 +64,4 @@
         app:layout_constraintLeft_toRightOf="@+id/createButton"
         android:text="@string/cancel_button"/>
 
-</android.support.constraint.ConstraintLayout>
+</androidx.constraintlayout.widget.ConstraintLayout>
diff --git a/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/res/layout/fragment_student_update_dialog.xml b/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/res/layout/fragment_student_update_dialog.xml
index 3212736..752882a 100644
--- a/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/res/layout/fragment_student_update_dialog.xml
+++ b/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/res/layout/fragment_student_update_dialog.xml
@@ -1,4 +1,4 @@
-<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
@@ -64,4 +64,4 @@
         app:layout_constraintLeft_toRightOf="@+id/createButton"
         android:text="@string/cancel_button"/>
 
-</android.support.constraint.ConstraintLayout>
+</androidx.constraintlayout.widget.ConstraintLayout>
diff --git a/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/res/layout/fragment_subject_create_dialog.xml b/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/res/layout/fragment_subject_create_dialog.xml
index 11c03c0..e42c75a 100644
--- a/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/res/layout/fragment_subject_create_dialog.xml
+++ b/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/res/layout/fragment_subject_create_dialog.xml
@@ -1,4 +1,4 @@
-<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
@@ -54,4 +54,4 @@
         app:layout_constraintLeft_toRightOf="@id/createButton"
         android:text="@string/cancel_button"/>
 
-</android.support.constraint.ConstraintLayout>
+</androidx.constraintlayout.widget.ConstraintLayout>
diff --git a/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/res/layout/fragment_subject_update_dialog.xml b/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/res/layout/fragment_subject_update_dialog.xml
index 2d7ecea..ad070b5 100644
--- a/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/res/layout/fragment_subject_update_dialog.xml
+++ b/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/res/layout/fragment_subject_update_dialog.xml
@@ -1,4 +1,4 @@
-<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
@@ -54,4 +54,4 @@
         app:layout_constraintLeft_toRightOf="@id/updateButton"
         android:text="@string/cancel_button"/>
     
-</android.support.constraint.ConstraintLayout>
+</androidx.constraintlayout.widget.ConstraintLayout>
diff --git a/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/res/layout/item_student.xml b/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/res/layout/item_student.xml
index 5e6b876..391bf45 100644
--- a/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/res/layout/item_student.xml
+++ b/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/res/layout/item_student.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     xmlns:app="http://schemas.android.com/apk/res-auto"
@@ -101,4 +101,4 @@
         android:layout_marginStart="4dp"
         android:layout_marginLeft="4dp"/>
 
-</android.support.constraint.ConstraintLayout>
\ No newline at end of file
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/res/layout/item_subject.xml b/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/res/layout/item_subject.xml
index f3b8ab6..e4ab88a 100644
--- a/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/res/layout/item_subject.xml
+++ b/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/res/layout/item_subject.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.constraint.ConstraintLayout
+<androidx.constraintlayout.widget.ConstraintLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
@@ -29,7 +29,7 @@
         android:layout_height="wrap_content"
         app:layout_constraintTop_toTopOf="parent"
         app:layout_constraintRight_toLeftOf="@+id/crossImageView"
-        android:src="@drawable/ic_mode_edit_black_24dp"
+        app:srcCompat="@drawable/ic_mode_edit_black_24dp"
         android:alpha="0.5"
         android:layout_marginEnd="8dp"
         android:layout_marginRight="8dp"
@@ -41,7 +41,7 @@
         android:layout_height="wrap_content"
         app:layout_constraintTop_toTopOf="parent"
         app:layout_constraintRight_toRightOf="parent"
-        android:src="@drawable/ic_delete_black_24dp"
+        app:srcCompat="@drawable/ic_delete_black_24dp"
         android:alpha="0.5"
         android:contentDescription="@string/cross_image_content_description" />
 
@@ -83,4 +83,4 @@
         android:layout_marginStart="4dp"
         android:layout_marginLeft="4dp"/>
 
-</android.support.constraint.ConstraintLayout>
\ No newline at end of file
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/res/layout/student_info.xml b/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/res/layout/student_info.xml
index d25b90e..243cd15 100644
--- a/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/res/layout/student_info.xml
+++ b/02.SQLite-Multiple-(Two)-Tables-CRUD/app/src/main/res/layout/student_info.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     xmlns:app="http://schemas.android.com/apk/res-auto"
@@ -11,6 +11,8 @@
         android:layout_height="wrap_content"
         android:text="@string/student_information"
         android:textColor="@color/colorPrimary"
+        app:layout_constraintLeft_toLeftOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
         android:textSize="18sp"/>
 
     <View
@@ -78,4 +80,4 @@
         app:layout_constraintRight_toRightOf="parent"
         android:text="@string/update"/>
 
-</android.support.constraint.ConstraintLayout>
\ No newline at end of file
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/02.SQLite-Multiple-(Two)-Tables-CRUD/build.gradle b/02.SQLite-Multiple-(Two)-Tables-CRUD/build.gradle
index ad6a928..3117577 100644
--- a/02.SQLite-Multiple-(Two)-Tables-CRUD/build.gradle
+++ b/02.SQLite-Multiple-(Two)-Tables-CRUD/build.gradle
@@ -6,7 +6,7 @@ buildscript {
         google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.1.3'
+        classpath 'com.android.tools.build:gradle:3.5.1'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
diff --git a/02.SQLite-Multiple-(Two)-Tables-CRUD/gradle.properties b/02.SQLite-Multiple-(Two)-Tables-CRUD/gradle.properties
index aac7c9b..9e6fce1 100644
--- a/02.SQLite-Multiple-(Two)-Tables-CRUD/gradle.properties
+++ b/02.SQLite-Multiple-(Two)-Tables-CRUD/gradle.properties
@@ -9,6 +9,8 @@
 
 # Specifies the JVM arguments used for the daemon process.
 # The setting is particularly useful for tweaking memory settings.
+android.enableJetifier=true
+android.useAndroidX=true
 org.gradle.jvmargs=-Xmx1536m
 
 # When configured, Gradle will run in incubating parallel mode.
diff --git a/02.SQLite-Multiple-(Two)-Tables-CRUD/gradle/wrapper/gradle-wrapper.properties b/02.SQLite-Multiple-(Two)-Tables-CRUD/gradle/wrapper/gradle-wrapper.properties
index a3f0bf2..3435c93 100644
--- a/02.SQLite-Multiple-(Two)-Tables-CRUD/gradle/wrapper/gradle-wrapper.properties
+++ b/02.SQLite-Multiple-(Two)-Tables-CRUD/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
-#Wed Jun 06 14:10:58 BDT 2018
+#Thu Oct 31 11:21:27 BDT 2019
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.4-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.4.1-all.zip
diff --git a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/build.gradle b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/build.gradle
index 26cc8b4..8f74054 100644
--- a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/build.gradle
+++ b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/build.gradle
@@ -1,14 +1,14 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 27
+    compileSdkVersion 28
     defaultConfig {
         applicationId "com.hellohasan.sqlite_multiple_three_tables_crud"
-        minSdkVersion 17
-        targetSdkVersion 27
+        minSdkVersion 19
+        targetSdkVersion 28
         versionCode 1
         versionName "1.0"
-        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         vectorDrawables.useSupportLibrary = true
     }
     buildTypes {
@@ -21,13 +21,13 @@ android {
 
 dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
-    implementation 'com.android.support:appcompat-v7:27.1.1'
-    implementation 'com.android.support.constraint:constraint-layout:1.1.0'
-    implementation 'com.android.support:design:27.1.1'
-    implementation 'com.android.support:cardview-v7:27.1.1'
-    implementation 'com.android.support:recyclerview-v7:27.1.1'
+    implementation 'androidx.appcompat:appcompat:1.1.0'
+    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
+    implementation 'com.google.android.material:material:1.0.0'
+    implementation 'androidx.cardview:cardview:1.0.0'
+    implementation 'androidx.recyclerview:recyclerview:1.0.0'
     testImplementation 'junit:junit:4.12'
-    androidTestImplementation 'com.android.support.test:runner:1.0.2'
-    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
     implementation 'com.orhanobut:logger:2.2.0'
 }
diff --git a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/androidTest/java/com/hellohasan/sqlite_multiple_three_tables_crud/ExampleInstrumentedTest.java b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/androidTest/java/com/hellohasan/sqlite_multiple_three_tables_crud/ExampleInstrumentedTest.java
index b1dc055..5df2f5c 100644
--- a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/androidTest/java/com/hellohasan/sqlite_multiple_three_tables_crud/ExampleInstrumentedTest.java
+++ b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/androidTest/java/com/hellohasan/sqlite_multiple_three_tables_crud/ExampleInstrumentedTest.java
@@ -1,8 +1,8 @@
 package com.hellohasan.sqlite_multiple_three_tables_crud;
 
 import android.content.Context;
-import android.support.test.InstrumentationRegistry;
-import android.support.test.runner.AndroidJUnit4;
+import androidx.test.platform.app.InstrumentationRegistry;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
 
 import org.junit.Test;
 import org.junit.runner.RunWith;
diff --git a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/student_crud/student_create/StudentCreateDialogFragment.java b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/student_crud/student_create/StudentCreateDialogFragment.java
index 0acb74d..18e12c3 100644
--- a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/student_crud/student_create/StudentCreateDialogFragment.java
+++ b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/student_crud/student_create/StudentCreateDialogFragment.java
@@ -2,7 +2,7 @@
 
 import android.app.Dialog;
 import android.os.Bundle;
-import android.support.v4.app.DialogFragment;
+import androidx.fragment.app.DialogFragment;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
diff --git a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/student_crud/student_list_show/StudentListActivity.java b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/student_crud/student_list_show/StudentListActivity.java
index f96e049..d1c16cc 100644
--- a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/student_crud/student_list_show/StudentListActivity.java
+++ b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/student_crud/student_list_show/StudentListActivity.java
@@ -2,11 +2,11 @@
 
 import android.content.Intent;
 import android.os.Bundle;
-import android.support.design.widget.FloatingActionButton;
-import android.support.v7.app.AppCompatActivity;
-import android.support.v7.widget.LinearLayoutManager;
-import android.support.v7.widget.RecyclerView;
-import android.support.v7.widget.Toolbar;
+import com.google.android.material.floatingactionbutton.FloatingActionButton;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.recyclerview.widget.LinearLayoutManager;
+import androidx.recyclerview.widget.RecyclerView;
+import androidx.appcompat.widget.Toolbar;
 import android.view.View;
 import android.view.Menu;
 import android.view.MenuItem;
diff --git a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/student_crud/student_list_show/StudentListAdapter.java b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/student_crud/student_list_show/StudentListAdapter.java
index 0dc1ab7..06a063e 100644
--- a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/student_crud/student_list_show/StudentListAdapter.java
+++ b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/student_crud/student_list_show/StudentListAdapter.java
@@ -3,9 +3,9 @@
 import android.content.Context;
 import android.content.DialogInterface;
 import android.content.Intent;
-import android.support.annotation.NonNull;
-import android.support.v7.app.AlertDialog;
-import android.support.v7.widget.RecyclerView;
+import androidx.annotation.NonNull;
+import androidx.appcompat.app.AlertDialog;
+import androidx.recyclerview.widget.RecyclerView;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
diff --git a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/student_crud/student_list_show/StudentViewHolder.java b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/student_crud/student_list_show/StudentViewHolder.java
index dc88110..4265918 100644
--- a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/student_crud/student_list_show/StudentViewHolder.java
+++ b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/student_crud/student_list_show/StudentViewHolder.java
@@ -1,6 +1,6 @@
 package com.hellohasan.sqlite_multiple_three_tables_crud.features.student_crud.student_list_show;
 
-import android.support.v7.widget.RecyclerView;
+import androidx.recyclerview.widget.RecyclerView;
 import android.view.View;
 import android.widget.ImageView;
 import android.widget.TextView;
diff --git a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/student_crud/student_update/StudentUpdateDialogFragment.java b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/student_crud/student_update/StudentUpdateDialogFragment.java
index 0c71a5b..c823884 100644
--- a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/student_crud/student_update/StudentUpdateDialogFragment.java
+++ b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/student_crud/student_update/StudentUpdateDialogFragment.java
@@ -2,7 +2,7 @@
 
 import android.app.Dialog;
 import android.os.Bundle;
-import android.support.v4.app.DialogFragment;
+import androidx.fragment.app.DialogFragment;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
diff --git a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/subject_crud/subject_create/SubjectCreateDialogFragment.java b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/subject_crud/subject_create/SubjectCreateDialogFragment.java
index b42c15b..8d8bd3a 100644
--- a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/subject_crud/subject_create/SubjectCreateDialogFragment.java
+++ b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/subject_crud/subject_create/SubjectCreateDialogFragment.java
@@ -1,9 +1,9 @@
 package com.hellohasan.sqlite_multiple_three_tables_crud.features.subject_crud.subject_create;
 
 import android.app.Dialog;
-import android.support.v4.app.DialogFragment;
+import androidx.fragment.app.DialogFragment;
 import android.os.Bundle;
-import android.support.annotation.Nullable;
+import androidx.annotation.Nullable;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -37,7 +37,7 @@ public static SubjectCreateDialogFragment newInstance(String title, SubjectCrudL
         args.putString("title", title);
         subjectCreateDialogFragment.setArguments(args);
 
-        subjectCreateDialogFragment.setStyle(android.support.v4.app.DialogFragment.STYLE_NORMAL, R.style.CustomDialog);
+        subjectCreateDialogFragment.setStyle(DialogFragment.STYLE_NORMAL, R.style.CustomDialog);
 
         return subjectCreateDialogFragment;
     }
diff --git a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/subject_crud/subject_list_show/SubjectListActivity.java b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/subject_crud/subject_list_show/SubjectListActivity.java
index f286d05..02f63a2 100644
--- a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/subject_crud/subject_list_show/SubjectListActivity.java
+++ b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/subject_crud/subject_list_show/SubjectListActivity.java
@@ -1,11 +1,11 @@
 package com.hellohasan.sqlite_multiple_three_tables_crud.features.subject_crud.subject_list_show;
 
 import android.os.Bundle;
-import android.support.design.widget.FloatingActionButton;
-import android.support.v7.app.AppCompatActivity;
-import android.support.v7.widget.LinearLayoutManager;
-import android.support.v7.widget.RecyclerView;
-import android.support.v7.widget.Toolbar;
+import com.google.android.material.floatingactionbutton.FloatingActionButton;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.recyclerview.widget.LinearLayoutManager;
+import androidx.recyclerview.widget.RecyclerView;
+import androidx.appcompat.widget.Toolbar;
 import android.view.View;
 import android.widget.TextView;
 
diff --git a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/subject_crud/subject_list_show/SubjectListAdapter.java b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/subject_crud/subject_list_show/SubjectListAdapter.java
index 653cc36..365c3f3 100644
--- a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/subject_crud/subject_list_show/SubjectListAdapter.java
+++ b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/subject_crud/subject_list_show/SubjectListAdapter.java
@@ -2,9 +2,9 @@
 
 import android.content.Context;
 import android.content.DialogInterface;
-import android.support.annotation.NonNull;
-import android.support.v7.app.AlertDialog;
-import android.support.v7.widget.RecyclerView;
+import androidx.annotation.NonNull;
+import androidx.appcompat.app.AlertDialog;
+import androidx.recyclerview.widget.RecyclerView;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
diff --git a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/subject_crud/subject_list_show/SubjectViewHolder.java b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/subject_crud/subject_list_show/SubjectViewHolder.java
index 5b14692..7933cb1 100644
--- a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/subject_crud/subject_list_show/SubjectViewHolder.java
+++ b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/subject_crud/subject_list_show/SubjectViewHolder.java
@@ -1,6 +1,6 @@
 package com.hellohasan.sqlite_multiple_three_tables_crud.features.subject_crud.subject_list_show;
 
-import android.support.v7.widget.RecyclerView;
+import androidx.recyclerview.widget.RecyclerView;
 import android.view.View;
 import android.widget.ImageView;
 import android.widget.TextView;
diff --git a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/subject_crud/subject_update/SubjectUpdateDialogFragment.java b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/subject_crud/subject_update/SubjectUpdateDialogFragment.java
index 2eba43e..fe1dafc 100644
--- a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/subject_crud/subject_update/SubjectUpdateDialogFragment.java
+++ b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/subject_crud/subject_update/SubjectUpdateDialogFragment.java
@@ -2,7 +2,7 @@
 
 import android.app.Dialog;
 import android.os.Bundle;
-import android.support.v4.app.DialogFragment;
+import androidx.fragment.app.DialogFragment;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
diff --git a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/taken_subject_crud/subject_assign/SubjectAssignActivity.java b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/taken_subject_crud/subject_assign/SubjectAssignActivity.java
index 9adaea5..b1bfe27 100644
--- a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/taken_subject_crud/subject_assign/SubjectAssignActivity.java
+++ b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/taken_subject_crud/subject_assign/SubjectAssignActivity.java
@@ -1,9 +1,9 @@
 package com.hellohasan.sqlite_multiple_three_tables_crud.features.taken_subject_crud.subject_assign;
 
-import android.support.v7.app.AppCompatActivity;
+import androidx.appcompat.app.AppCompatActivity;
 import android.os.Bundle;
-import android.support.v7.widget.LinearLayoutManager;
-import android.support.v7.widget.RecyclerView;
+import androidx.recyclerview.widget.LinearLayoutManager;
+import androidx.recyclerview.widget.RecyclerView;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.TextView;
diff --git a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/taken_subject_crud/subject_assign/SubjectAssignListAdapter.java b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/taken_subject_crud/subject_assign/SubjectAssignListAdapter.java
index 25a9343..dfe5076 100644
--- a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/taken_subject_crud/subject_assign/SubjectAssignListAdapter.java
+++ b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/taken_subject_crud/subject_assign/SubjectAssignListAdapter.java
@@ -1,8 +1,8 @@
 package com.hellohasan.sqlite_multiple_three_tables_crud.features.taken_subject_crud.subject_assign;
 
 import android.content.Context;
-import android.support.annotation.NonNull;
-import android.support.v7.widget.RecyclerView;
+import androidx.annotation.NonNull;
+import androidx.recyclerview.widget.RecyclerView;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
diff --git a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/taken_subject_crud/subject_assign/SubjectAssignViewHolder.java b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/taken_subject_crud/subject_assign/SubjectAssignViewHolder.java
index d4c94f6..679254a 100644
--- a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/taken_subject_crud/subject_assign/SubjectAssignViewHolder.java
+++ b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/taken_subject_crud/subject_assign/SubjectAssignViewHolder.java
@@ -1,6 +1,6 @@
 package com.hellohasan.sqlite_multiple_three_tables_crud.features.taken_subject_crud.subject_assign;
 
-import android.support.v7.widget.RecyclerView;
+import androidx.recyclerview.widget.RecyclerView;
 import android.view.View;
 import android.widget.CheckBox;
 import android.widget.TextView;
diff --git a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/taken_subject_crud/taken_subject_show/StudentTakenSubjectActivity.java b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/taken_subject_crud/taken_subject_show/StudentTakenSubjectActivity.java
index 4511887..5bb5ad5 100644
--- a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/taken_subject_crud/taken_subject_show/StudentTakenSubjectActivity.java
+++ b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/taken_subject_crud/taken_subject_show/StudentTakenSubjectActivity.java
@@ -1,10 +1,10 @@
 package com.hellohasan.sqlite_multiple_three_tables_crud.features.taken_subject_crud.taken_subject_show;
 
 import android.content.Intent;
-import android.support.v7.app.AppCompatActivity;
+import androidx.appcompat.app.AppCompatActivity;
 import android.os.Bundle;
-import android.support.v7.widget.LinearLayoutManager;
-import android.support.v7.widget.RecyclerView;
+import androidx.recyclerview.widget.LinearLayoutManager;
+import androidx.recyclerview.widget.RecyclerView;
 import android.view.View;
 import android.widget.ImageView;
 import android.widget.TextView;
diff --git a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/taken_subject_crud/taken_subject_show/TakenSubjectListAdapter.java b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/taken_subject_crud/taken_subject_show/TakenSubjectListAdapter.java
index 4cb312f..ebd10c0 100644
--- a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/taken_subject_crud/taken_subject_show/TakenSubjectListAdapter.java
+++ b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/taken_subject_crud/taken_subject_show/TakenSubjectListAdapter.java
@@ -1,8 +1,8 @@
 package com.hellohasan.sqlite_multiple_three_tables_crud.features.taken_subject_crud.taken_subject_show;
 
 import android.content.Context;
-import android.support.annotation.NonNull;
-import android.support.v7.widget.RecyclerView;
+import androidx.annotation.NonNull;
+import androidx.recyclerview.widget.RecyclerView;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
diff --git a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/taken_subject_crud/taken_subject_show/TakenSubjectViewHolder.java b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/taken_subject_crud/taken_subject_show/TakenSubjectViewHolder.java
index d3bebd9..c5434af 100644
--- a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/taken_subject_crud/taken_subject_show/TakenSubjectViewHolder.java
+++ b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/java/com/hellohasan/sqlite_multiple_three_tables_crud/features/taken_subject_crud/taken_subject_show/TakenSubjectViewHolder.java
@@ -1,6 +1,6 @@
 package com.hellohasan.sqlite_multiple_three_tables_crud.features.taken_subject_crud.taken_subject_show;
 
-import android.support.v7.widget.RecyclerView;
+import androidx.recyclerview.widget.RecyclerView;
 import android.view.View;
 import android.widget.ImageView;
 import android.widget.TextView;
diff --git a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/activity_student_list.xml b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/activity_student_list.xml
index b3c332f..5328332 100644
--- a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/activity_student_list.xml
+++ b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/activity_student_list.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
@@ -7,12 +7,12 @@
     android:background="@color/activity_background"
     tools:context="com.hellohasan.sqlite_multiple_three_tables_crud.features.student_crud.student_list_show.StudentListActivity">
 
-    <android.support.design.widget.AppBarLayout
+    <com.google.android.material.appbar.AppBarLayout
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:theme="@style/AppTheme.AppBarOverlay">
 
-        <android.support.v7.widget.Toolbar
+        <androidx.appcompat.widget.Toolbar
             android:id="@+id/toolbar"
             android:layout_width="match_parent"
             android:layout_height="?attr/actionBarSize"
@@ -20,11 +20,11 @@
             app:popupTheme="@style/AppTheme.PopupOverlay"
             app:title="@string/app_name"/>
 
-    </android.support.design.widget.AppBarLayout>
+    </com.google.android.material.appbar.AppBarLayout>
 
     <include layout="@layout/content_main" />
 
-    <android.support.design.widget.FloatingActionButton
+    <com.google.android.material.floatingactionbutton.FloatingActionButton
         android:id="@+id/fab"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
@@ -32,4 +32,4 @@
         android:layout_margin="@dimen/fab_margin"
         app:srcCompat="@drawable/ic_person_add_24dp" />
 
-</android.support.design.widget.CoordinatorLayout>
+</androidx.coordinatorlayout.widget.CoordinatorLayout>
diff --git a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/activity_student_taken_subject.xml b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/activity_student_taken_subject.xml
index ff6a298..f837bb8 100644
--- a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/activity_student_taken_subject.xml
+++ b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/activity_student_taken_subject.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
@@ -38,7 +38,7 @@
         app:layout_constraintTop_toTopOf="@id/titleLabel"
         app:srcCompat="@drawable/ic_add_subject_24dp" />
 
-    <android.support.v7.widget.RecyclerView
+    <androidx.recyclerview.widget.RecyclerView
         android:id="@+id/recyclerView"
         android:layout_width="0dp"
         android:layout_height="0dp"
@@ -49,7 +49,7 @@
         app:layout_constraintTop_toBottomOf="@id/titleLabel"
         tools:listitem="@layout/item_taken_subject">
 
-    </android.support.v7.widget.RecyclerView>
+    </androidx.recyclerview.widget.RecyclerView>
 
     <TextView
         android:id="@+id/noDataFoundTextView"
@@ -70,4 +70,4 @@
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent" />
 
-</android.support.constraint.ConstraintLayout>
\ No newline at end of file
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/activity_subject_assign.xml b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/activity_subject_assign.xml
index bfb1bf3..68a11db 100644
--- a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/activity_subject_assign.xml
+++ b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/activity_subject_assign.xml
@@ -1,12 +1,12 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     tools:context=".features.taken_subject_crud.subject_assign.SubjectAssignActivity">
 
-    <android.support.v7.widget.RecyclerView
+    <androidx.recyclerview.widget.RecyclerView
         android:id="@+id/recyclerView"
         android:layout_width="0dp"
         android:layout_height="0dp"
@@ -16,7 +16,7 @@
         app:layout_constraintStart_toStartOf="parent"
         tools:listitem="@layout/item_subject_assign">
 
-    </android.support.v7.widget.RecyclerView>
+    </androidx.recyclerview.widget.RecyclerView>
 
     <TextView
         android:id="@+id/noDataFoundTextView"
@@ -38,4 +38,4 @@
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent" />
 
-</android.support.constraint.ConstraintLayout>
\ No newline at end of file
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/activity_subject_list.xml b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/activity_subject_list.xml
index 9bb4511..df2dc6e 100644
--- a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/activity_subject_list.xml
+++ b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/activity_subject_list.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
@@ -7,12 +7,12 @@
     android:background="@color/activity_background"
     tools:context=".features.subject_crud.subject_list_show.SubjectListActivity">
 
-    <android.support.design.widget.AppBarLayout
+    <com.google.android.material.appbar.AppBarLayout
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:theme="@style/AppTheme.AppBarOverlay">
 
-        <android.support.v7.widget.Toolbar
+        <androidx.appcompat.widget.Toolbar
             android:id="@+id/toolbar"
             android:layout_width="match_parent"
             android:layout_height="?attr/actionBarSize"
@@ -20,11 +20,11 @@
             app:popupTheme="@style/AppTheme.PopupOverlay"
             app:title="@string/title_activity_subjects" />
 
-    </android.support.design.widget.AppBarLayout>
+    </com.google.android.material.appbar.AppBarLayout>
 
     <include layout="@layout/content_subjects" />
 
-    <android.support.design.widget.FloatingActionButton
+    <com.google.android.material.floatingactionbutton.FloatingActionButton
         android:id="@+id/fab"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
@@ -32,4 +32,4 @@
         android:layout_margin="@dimen/fab_margin"
         app:srcCompat="@drawable/ic_add_subject_24dp" />
 
-</android.support.design.widget.CoordinatorLayout>
\ No newline at end of file
+</androidx.coordinatorlayout.widget.CoordinatorLayout>
\ No newline at end of file
diff --git a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/activity_taken_subject.xml b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/activity_taken_subject.xml
index dad6f36..295b2f3 100644
--- a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/activity_taken_subject.xml
+++ b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/activity_taken_subject.xml
@@ -1,9 +1,9 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     tools:context=".features.taken_subject_crud.TakenSubjectActivity">
 
-</android.support.constraint.ConstraintLayout>
\ No newline at end of file
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/content_main.xml b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/content_main.xml
index 04bed15..c8c93b1 100644
--- a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/content_main.xml
+++ b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/content_main.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
@@ -8,7 +8,7 @@
     tools:context="com.hellohasan.sqlite_multiple_three_tables_crud.features.student_crud.student_list_show.StudentListActivity"
     tools:showIn="@layout/activity_student_list">
 
-    <android.support.v7.widget.RecyclerView
+    <androidx.recyclerview.widget.RecyclerView
         android:id="@+id/recyclerView"
         android:layout_width="0dp"
         android:layout_height="0dp"
@@ -19,7 +19,7 @@
         app:layout_constraintTop_toTopOf="parent"
         tools:listitem="@layout/item_student_card_view">
 
-    </android.support.v7.widget.RecyclerView>
+    </androidx.recyclerview.widget.RecyclerView>
 
     <include
         android:id="@+id/rowCountLayout"
@@ -42,4 +42,4 @@
         app:layout_constraintTop_toTopOf="parent"
         tools:visibility="visible" />
 
-</android.support.constraint.ConstraintLayout>
+</androidx.constraintlayout.widget.ConstraintLayout>
diff --git a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/content_subjects.xml b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/content_subjects.xml
index b890347..8fbc134 100644
--- a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/content_subjects.xml
+++ b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/content_subjects.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
@@ -8,7 +8,7 @@
     tools:context=".features.subject_crud.subject_list_show.SubjectListActivity"
     tools:showIn="@layout/activity_subject_list">
 
-    <android.support.v7.widget.RecyclerView
+    <androidx.recyclerview.widget.RecyclerView
         android:id="@+id/recyclerView"
         android:layout_width="0dp"
         android:layout_height="0dp"
@@ -19,7 +19,7 @@
         app:layout_constraintTop_toTopOf="parent"
         tools:listitem="@layout/item_subject_card_view">
 
-    </android.support.v7.widget.RecyclerView>
+    </androidx.recyclerview.widget.RecyclerView>
 
     <include
         android:id="@+id/rowCountLayout"
@@ -42,4 +42,4 @@
         app:layout_constraintTop_toTopOf="parent"
         tools:visibility="visible" />
 
-</android.support.constraint.ConstraintLayout>
\ No newline at end of file
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/fragment_student_create_dialog.xml b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/fragment_student_create_dialog.xml
index 2c9abc4..815be1b 100644
--- a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/fragment_student_create_dialog.xml
+++ b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/fragment_student_create_dialog.xml
@@ -1,4 +1,4 @@
-<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
@@ -63,4 +63,4 @@
         app:layout_constraintLeft_toRightOf="@+id/createButton"
         android:text="@string/cancel_button"/>
 
-</android.support.constraint.ConstraintLayout>
+</androidx.constraintlayout.widget.ConstraintLayout>
diff --git a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/fragment_student_update_dialog.xml b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/fragment_student_update_dialog.xml
index 89f62fb..abedf75 100644
--- a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/fragment_student_update_dialog.xml
+++ b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/fragment_student_update_dialog.xml
@@ -1,4 +1,4 @@
-<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
@@ -63,4 +63,4 @@
         app:layout_constraintLeft_toRightOf="@+id/updateButton"
         android:text="@string/cancel_button"/>
 
-</android.support.constraint.ConstraintLayout>
+</androidx.constraintlayout.widget.ConstraintLayout>
diff --git a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/fragment_subject_create_dialog.xml b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/fragment_subject_create_dialog.xml
index 8cc4e35..e31f361 100644
--- a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/fragment_subject_create_dialog.xml
+++ b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/fragment_subject_create_dialog.xml
@@ -1,4 +1,4 @@
-<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
@@ -52,4 +52,4 @@
         app:layout_constraintRight_toRightOf="parent"
         app:layout_constraintTop_toTopOf="@id/createButton" />
 
-</android.support.constraint.ConstraintLayout>
+</androidx.constraintlayout.widget.ConstraintLayout>
diff --git a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/fragment_subject_update_dialog.xml b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/fragment_subject_update_dialog.xml
index f1d7311..e5d36a5 100644
--- a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/fragment_subject_update_dialog.xml
+++ b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/fragment_subject_update_dialog.xml
@@ -1,4 +1,4 @@
-<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
@@ -51,4 +51,4 @@
         app:layout_constraintRight_toRightOf="parent"
         app:layout_constraintTop_toTopOf="@id/updateButton" />
 
-</android.support.constraint.ConstraintLayout>
+</androidx.constraintlayout.widget.ConstraintLayout>
diff --git a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/item_student_card_view.xml b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/item_student_card_view.xml
index e841fcd..7e1f0b4 100644
--- a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/item_student_card_view.xml
+++ b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/item_student_card_view.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.v7.widget.CardView
+<androidx.cardview.widget.CardView
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
@@ -8,7 +8,7 @@
     app:cardElevation="4dp"
     app:cardUseCompatPadding="true">
 
-    <android.support.constraint.ConstraintLayout
+    <androidx.constraintlayout.widget.ConstraintLayout
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:padding="8dp">
@@ -40,6 +40,6 @@
             app:layout_constraintTop_toTopOf="parent"
             app:srcCompat="@drawable/ic_delete_black_24dp" />
 
-    </android.support.constraint.ConstraintLayout>
+    </androidx.constraintlayout.widget.ConstraintLayout>
 
-</android.support.v7.widget.CardView>
\ No newline at end of file
+</androidx.cardview.widget.CardView>
\ No newline at end of file
diff --git a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/item_subject_assign.xml b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/item_subject_assign.xml
index b1232cd..ed3231a 100644
--- a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/item_subject_assign.xml
+++ b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/item_subject_assign.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.v7.widget.CardView
+<androidx.cardview.widget.CardView
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
@@ -10,7 +10,7 @@
     android:focusable="true"
     app:cardUseCompatPadding="true">
 
-    <android.support.constraint.ConstraintLayout
+    <androidx.constraintlayout.widget.ConstraintLayout
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:padding="8dp">
@@ -49,6 +49,6 @@
             app:layout_constraintTop_toBottomOf="@id/courseCodeTextView"
             tools:text="@string/course_credit" />
 
-    </android.support.constraint.ConstraintLayout>
+    </androidx.constraintlayout.widget.ConstraintLayout>
 
-</android.support.v7.widget.CardView>
\ No newline at end of file
+</androidx.cardview.widget.CardView>
\ No newline at end of file
diff --git a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/item_subject_card_view.xml b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/item_subject_card_view.xml
index c8f9258..0984f2f 100644
--- a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/item_subject_card_view.xml
+++ b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/item_subject_card_view.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.v7.widget.CardView
+<androidx.cardview.widget.CardView
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
@@ -11,7 +11,7 @@
     android:focusable="true"
     app:cardUseCompatPadding="true">
 
-    <android.support.constraint.ConstraintLayout
+    <androidx.constraintlayout.widget.ConstraintLayout
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:padding="8dp">
@@ -62,6 +62,6 @@
             app:layout_constraintTop_toTopOf="parent"
             app:srcCompat="@drawable/ic_edit_black_24dp" />
 
-    </android.support.constraint.ConstraintLayout>
+    </androidx.constraintlayout.widget.ConstraintLayout>
 
-</android.support.v7.widget.CardView>
\ No newline at end of file
+</androidx.cardview.widget.CardView>
\ No newline at end of file
diff --git a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/item_taken_subject.xml b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/item_taken_subject.xml
index 10a6a3c..df4f75d 100644
--- a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/item_taken_subject.xml
+++ b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/item_taken_subject.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.v7.widget.CardView
+<androidx.cardview.widget.CardView
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
@@ -11,7 +11,7 @@
     android:focusable="true"
     app:cardUseCompatPadding="true">
 
-    <android.support.constraint.ConstraintLayout
+    <androidx.constraintlayout.widget.ConstraintLayout
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:padding="8dp">
@@ -51,6 +51,6 @@
             app:layout_constraintTop_toTopOf="parent"
             app:srcCompat="@drawable/ic_delete_black_24dp" />
 
-    </android.support.constraint.ConstraintLayout>
+    </androidx.constraintlayout.widget.ConstraintLayout>
 
-</android.support.v7.widget.CardView>
\ No newline at end of file
+</androidx.cardview.widget.CardView>
\ No newline at end of file
diff --git a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/layout_student_info.xml b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/layout_student_info.xml
index 4acde55..adc665d 100644
--- a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/layout_student_info.xml
+++ b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/layout_student_info.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     xmlns:app="http://schemas.android.com/apk/res-auto"
@@ -69,4 +69,4 @@
         app:layout_constraintTop_toBottomOf="@id/emailTitle"
         tools:text="01559541265" />
 
-</android.support.constraint.ConstraintLayout>
\ No newline at end of file
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/layout_table_row_count.xml b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/layout_table_row_count.xml
index 47e49a6..e5c8131 100644
--- a/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/layout_table_row_count.xml
+++ b/03.SQLite-Multiple-(Three)-Tables-CRUD/app/src/main/res/layout/layout_table_row_count.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
@@ -31,4 +31,4 @@
         app:layout_constraintStart_toStartOf="parent"
         tools:text="@string/taken_subject_count" />
 
-</android.support.constraint.ConstraintLayout>
\ No newline at end of file
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/03.SQLite-Multiple-(Three)-Tables-CRUD/build.gradle b/03.SQLite-Multiple-(Three)-Tables-CRUD/build.gradle
index 43c0708..4244a30 100644
--- a/03.SQLite-Multiple-(Three)-Tables-CRUD/build.gradle
+++ b/03.SQLite-Multiple-(Three)-Tables-CRUD/build.gradle
@@ -7,7 +7,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.1.3'
+        classpath 'com.android.tools.build:gradle:3.5.1'
         
 
         // NOTE: Do not place your application dependencies here; they belong
diff --git a/03.SQLite-Multiple-(Three)-Tables-CRUD/gradle.properties b/03.SQLite-Multiple-(Three)-Tables-CRUD/gradle.properties
index aac7c9b..9e6fce1 100644
--- a/03.SQLite-Multiple-(Three)-Tables-CRUD/gradle.properties
+++ b/03.SQLite-Multiple-(Three)-Tables-CRUD/gradle.properties
@@ -9,6 +9,8 @@
 
 # Specifies the JVM arguments used for the daemon process.
 # The setting is particularly useful for tweaking memory settings.
+android.enableJetifier=true
+android.useAndroidX=true
 org.gradle.jvmargs=-Xmx1536m
 
 # When configured, Gradle will run in incubating parallel mode.
diff --git a/03.SQLite-Multiple-(Three)-Tables-CRUD/gradle/wrapper/gradle-wrapper.properties b/03.SQLite-Multiple-(Three)-Tables-CRUD/gradle/wrapper/gradle-wrapper.properties
index 3411cbf..1f3dc43 100644
--- a/03.SQLite-Multiple-(Three)-Tables-CRUD/gradle/wrapper/gradle-wrapper.properties
+++ b/03.SQLite-Multiple-(Three)-Tables-CRUD/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
-#Sun Apr 22 18:05:46 BDT 2018
+#Thu Oct 31 11:30:33 BDT 2019
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.4-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.4.1-all.zip