Starter code: AndroidX

app/build.gradle

@@ -1,15 +1,14 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 25
-    buildToolsVersion "25.0.2"
+    compileSdkVersion 31
     defaultConfig {
         applicationId "com.example.android.shushme"
-        minSdkVersion 16
-        targetSdkVersion 25
+        minSdkVersion 23
+        targetSdkVersion 31
         versionCode 1
         versionName "1.0"
-        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+        testInstrumentationRunner 'androidx.test.runner.AndroidJUnitRunner'
     }
     buildTypes {
         release {
@@ -20,11 +19,11 @@ android {
 }
 
 dependencies {
-    compile fileTree(dir: 'libs', include: ['*.jar'])
-    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+    androidTestImplementation('androidx.test.espresso:espresso-core:3.1.0', {
         exclude group: 'com.android.support', module: 'support-annotations'
     })
-    compile 'com.android.support:appcompat-v7:25.1.0'
-    compile 'com.android.support:recyclerview-v7:25.0.1'
-    testCompile 'junit:junit:4.12'
+    implementation 'androidx.appcompat:appcompat:1.4.1'
+    implementation 'androidx.recyclerview:recyclerview:1.2.1'
+    testImplementation 'junit:junit:4.13.2'
 }

app/src/main/AndroidManifest.xml

@@ -7,8 +7,10 @@
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
         android:supportsRtl="true"
-        android:theme="@style/AppTheme">
-        <activity android:name="com.example.android.shushme.MainActivity">
+        android:theme="@style/AppTheme"
+        android:fullBackupContent="@xml/backup_descriptor">
+        <activity android:name="com.example.android.shushme.MainActivity"
+            android:exported="true">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
                 <category android:name="android.intent.category.LAUNCHER" />

app/src/main/java/com/example/android/shushme/MainActivity.java

@@ -17,9 +17,9 @@
 */
 
 import android.os.Bundle;
-import android.support.v7.app.AppCompatActivity;
-import android.support.v7.widget.LinearLayoutManager;
-import android.support.v7.widget.RecyclerView;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.recyclerview.widget.LinearLayoutManager;
+import androidx.recyclerview.widget.RecyclerView;
 
 public class MainActivity extends AppCompatActivity {
 
@@ -41,7 +41,7 @@ protected void onCreate(Bundle savedInstanceState) {
         setContentView(R.layout.activity_main);
 
         // Set up the recycler view
-        mRecyclerView = (RecyclerView) findViewById(R.id.places_list_recycler_view);
+        mRecyclerView =findViewById(R.id.places_list_recycler_view);
         mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
         mAdapter = new PlaceListAdapter(this);
         mRecyclerView.setAdapter(mAdapter);

app/src/main/java/com/example/android/shushme/PlaceListAdapter.java

@@ -17,7 +17,7 @@
 */
 
 import android.content.Context;
-import android.support.v7.widget.RecyclerView;
+import androidx.recyclerview.widget.RecyclerView;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -83,8 +83,8 @@ class PlaceViewHolder extends RecyclerView.ViewHolder {
 
         public PlaceViewHolder(View itemView) {
             super(itemView);
-            nameTextView = (TextView) itemView.findViewById(R.id.name_text_view);
-            addressTextView = (TextView) itemView.findViewById(R.id.address_text_view);
+            nameTextView = itemView.findViewById(R.id.name_text_view);
+            addressTextView = itemView.findViewById(R.id.address_text_view);
         }
 
     }

app/src/main/java/com/example/android/shushme/provider/PlaceContentProvider.java

@@ -24,7 +24,7 @@
 import android.database.Cursor;
 import android.database.sqlite.SQLiteDatabase;
 import android.net.Uri;
-import android.support.annotation.NonNull;
+import androidx.annotation.NonNull;
 
 import static com.example.android.shushme.provider.PlaceContract.PlaceEntry;
 

app/src/main/res/layout/activity_main.xml

@@ -50,7 +50,7 @@
                 android:paddingTop="4dp"
                 android:src="@drawable/ic_globe_primary_24dp" />
 
-            <Switch
+            <androidx.appcompat.widget.SwitchCompat
                 android:id="@+id/enable_switch"
                 android:layout_width="match_parent"
                 android:layout_height="match_parent"
@@ -83,7 +83,7 @@
             android:layout_marginTop="4dp"
             android:background="@color/colorPrimary" />
 
-        <android.support.v7.widget.RecyclerView
+        <androidx.recyclerview.widget.RecyclerView
             android:id="@+id/places_list_recycler_view"
             android:layout_width="match_parent"
             android:layout_height="wrap_content" />

app/src/main/res/xml/backup_descriptor.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<full-backup-content>
+    <!-- Exclude specific shared preferences that contain GCM registration Id -->
+</full-backup-content>

build.gradle

@@ -2,10 +2,11 @@
 
 buildscript {
     repositories {
-        jcenter()
+        google()
+        mavenCentral()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.2.3'
+        classpath 'com.android.tools.build:gradle:7.0.4'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
@@ -14,7 +15,8 @@ buildscript {
 
 allprojects {
     repositories {
-        jcenter()
+        google()
+        mavenCentral()
     }
 }
 

gradle.properties

@@ -10,7 +10,8 @@
 # Specifies the JVM arguments used for the daemon process.
 # The setting is particularly useful for tweaking memory settings.
 org.gradle.jvmargs=-Xmx1536m
-
+android.enableJetifier=true
+android.useAndroidX=true
 # When configured, Gradle will run in incubating parallel mode.
 # This option should only be used with decoupled projects. More details, visit
 # http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
-#Mon Dec 28 10:00:20 PST 2015
+#Thu Jan 20 17:04:55 IST 2022
 distributionBase=GRADLE_USER_HOME
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.3.3-bin.zip
 distributionPath=wrapper/dists
-zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-2.14.1-all.zip
+zipStoreBase=GRADLE_USER_HOME