Fixed build warnings and imports.

java/admanager/AppOpenExample/app/src/main/java/com/google/android/gms/example/appopendemo/MainActivity.java

@@ -16,12 +16,12 @@
 package com.google.android.gms.example.appopendemo;
 
 import android.os.Bundle;
-import androidx.appcompat.app.AppCompatActivity;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.view.View;
 import android.widget.PopupMenu;
 import android.widget.Toast;
+import androidx.appcompat.app.AppCompatActivity;
 
 /** Main activity in the app. */
 public class MainActivity extends AppCompatActivity {

java/admanager/AppOpenExample/app/src/main/java/com/google/android/gms/example/appopendemo/MyApplication.java

@@ -24,9 +24,8 @@
 import android.widget.Toast;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
-import androidx.lifecycle.Lifecycle.Event;
-import androidx.lifecycle.LifecycleObserver;
-import androidx.lifecycle.OnLifecycleEvent;
+import androidx.lifecycle.DefaultLifecycleObserver;
+import androidx.lifecycle.LifecycleOwner;
 import androidx.lifecycle.ProcessLifecycleOwner;
 import com.google.android.gms.ads.AdError;
 import com.google.android.gms.ads.FullScreenContentCallback;
@@ -38,7 +37,7 @@
 
 /** Application class that initializes, loads and show ads when activities change states. */
 public class MyApplication extends Application
-    implements ActivityLifecycleCallbacks, LifecycleObserver {
+    implements ActivityLifecycleCallbacks, DefaultLifecycleObserver {
 
   private AppOpenAdManager appOpenAdManager;
   private Activity currentActivity;
@@ -54,9 +53,9 @@ public void onCreate() {
   }
 
   /** LifecycleObserver method that shows the app open ad when the app moves to foreground. */
-  @OnLifecycleEvent(Event.ON_START)
-  protected void onMoveToForeground() {
-    // Show the ad (if available) when the app moves to foreground.
+  @Override
+  public void onStart(@NonNull LifecycleOwner owner) {
+    DefaultLifecycleObserver.super.onStart(owner);
     appOpenAdManager.showAdIfAvailable(currentActivity);
   }
 

java/admanager/AppOpenExample/app/src/main/java/com/google/android/gms/example/appopendemo/SplashActivity.java

@@ -15,13 +15,14 @@
  */
 package com.google.android.gms.example.appopendemo;
 
+import android.annotation.SuppressLint;
 import android.app.Application;
 import android.content.Intent;
 import android.os.Bundle;
 import android.os.CountDownTimer;
-import androidx.appcompat.app.AppCompatActivity;
 import android.util.Log;
 import android.widget.TextView;
+import androidx.appcompat.app.AppCompatActivity;
 import com.google.android.gms.ads.MobileAds;
 import com.google.android.gms.example.appopendemo.MyApplication.OnShowAdCompleteListener;
 import java.util.concurrent.TimeUnit;
@@ -47,7 +48,7 @@ protected void onCreate(Bundle savedInstanceState) {
     setContentView(R.layout.activity_splash);
 
     // Create a timer so the SplashActivity will be displayed for a fixed amount of time.
-    createTimer(COUNTER_TIME_MILLISECONDS);
+    createTimer();
 
     googleMobileAdsConsentManager =
         GoogleMobileAdsConsentManager.getInstance(getApplicationContext());
@@ -77,22 +78,20 @@ protected void onCreate(Bundle savedInstanceState) {
     }
   }
 
-  /**
-   * Create the countdown timer, which counts down to zero and show the app open ad.
-   *
-   * @param time the number of milliseconds that the timer counts down from
-   */
-  private void createTimer(long time) {
+  /** Create the countdown timer, which counts down to zero and show the app open ad. */
+  private void createTimer() {
     final TextView counterTextView = findViewById(R.id.timer);
 
     CountDownTimer countDownTimer =
-        new CountDownTimer(time, 1000) {
+        new CountDownTimer(SplashActivity.COUNTER_TIME_MILLISECONDS, 1000) {
+          @SuppressLint("SetTextI18n")
           @Override
           public void onTick(long millisUntilFinished) {
             secondsRemaining = TimeUnit.MILLISECONDS.toSeconds(millisUntilFinished) + 1;
             counterTextView.setText("App is done loading in: " + secondsRemaining);
           }
 
+          @SuppressLint("SetTextI18n")
           @Override
           public void onFinish() {
             secondsRemaining = 0;

java/admanager/BannerExample/app/src/main/java/com/google/android/gms/example/bannerexample/MyActivity.java

@@ -17,7 +17,6 @@
 package com.google.android.gms.example.bannerexample;
 
 import android.os.Bundle;
-import androidx.appcompat.app.AppCompatActivity;
 import android.util.DisplayMetrics;
 import android.util.Log;
 import android.view.Display;
@@ -27,6 +26,7 @@
 import android.widget.FrameLayout;
 import android.widget.PopupMenu;
 import android.widget.Toast;
+import androidx.appcompat.app.AppCompatActivity;
 import com.google.android.gms.ads.AdSize;
 import com.google.android.gms.ads.MobileAds;
 import com.google.android.gms.ads.RequestConfiguration;

java/admanager/InterstitialExample/app/src/main/java/com/google/android/gms/example/interstitialexample/MyActivity.java

@@ -18,7 +18,6 @@
 import android.annotation.SuppressLint;
 import android.os.Bundle;
 import android.os.CountDownTimer;
-import androidx.appcompat.app.AppCompatActivity;
 import android.util.Log;
 import android.view.Menu;
 import android.view.MenuItem;
@@ -28,6 +27,7 @@
 import android.widget.TextView;
 import android.widget.Toast;
 import androidx.annotation.NonNull;
+import androidx.appcompat.app.AppCompatActivity;
 import com.google.android.gms.ads.AdError;
 import com.google.android.gms.ads.FullScreenContentCallback;
 import com.google.android.gms.ads.LoadAdError;
@@ -244,8 +244,11 @@ public void onAdFailedToLoad(@NonNull LoadAdError loadAdError) {
             adIsLoading = false;
             String error =
                 String.format(
+                    java.util.Locale.US,
                     "domain: %s, code: %d, message: %s",
-                    loadAdError.getDomain(), loadAdError.getCode(), loadAdError.getMessage());
+                    loadAdError.getDomain(),
+                    loadAdError.getCode(),
+                    loadAdError.getMessage());
             Toast.makeText(
                     MyActivity.this, "onAdFailedToLoad() with error: " + error, Toast.LENGTH_SHORT)
                 .show();

java/admanager/NativeAdsExample/app/src/main/java/com/google/example/gms/nativeadsexample/MainActivity.java

@@ -19,7 +19,6 @@
 import android.annotation.SuppressLint;
 import android.os.Build;
 import android.os.Bundle;
-import androidx.appcompat.app.AppCompatActivity;
 import android.util.Log;
 import android.view.Menu;
 import android.view.MenuItem;
@@ -32,6 +31,7 @@
 import android.widget.RatingBar;
 import android.widget.TextView;
 import android.widget.Toast;
+import androidx.appcompat.app.AppCompatActivity;
 import com.google.android.gms.ads.AdListener;
 import com.google.android.gms.ads.AdLoader;
 import com.google.android.gms.ads.LoadAdError;

java/admanager/RewardedInterstitialExample/app/src/main/java/com/google/ads/rewardedinterstitialexample/AdDialogFragment.java

@@ -6,13 +6,13 @@
 import android.content.DialogInterface;
 import android.os.Bundle;
 import android.os.CountDownTimer;
-import androidx.fragment.app.DialogFragment;
-import androidx.appcompat.app.AlertDialog;
 import android.util.Log;
 import android.view.View;
 import android.widget.TextView;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
+import androidx.appcompat.app.AlertDialog;
+import androidx.fragment.app.DialogFragment;
 
 /**
  * A dialog fragment to inform the users about an upcoming interstitial video ad and let the user

java/admanager/RewardedVideoExample/app/src/main/java/com/google/ads/rewardedvideoexample/MainActivity.java

@@ -4,7 +4,6 @@
 import android.app.Activity;
 import android.os.Bundle;
 import android.os.CountDownTimer;
-import androidx.appcompat.app.AppCompatActivity;
 import android.util.Log;
 import android.view.Menu;
 import android.view.MenuItem;
@@ -14,6 +13,7 @@
 import android.widget.TextView;
 import android.widget.Toast;
 import androidx.annotation.NonNull;
+import androidx.appcompat.app.AppCompatActivity;
 import com.google.android.gms.ads.AdError;
 import com.google.android.gms.ads.FullScreenContentCallback;
 import com.google.android.gms.ads.LoadAdError;

java/admob/AppOpenExample/app/src/main/java/com/google/android/gms/example/appopenexample/MainActivity.java

@@ -16,12 +16,12 @@
 package com.google.android.gms.example.appopenexample;
 
 import android.os.Bundle;
-import androidx.appcompat.app.AppCompatActivity;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.view.View;
 import android.widget.PopupMenu;
 import android.widget.Toast;
+import androidx.appcompat.app.AppCompatActivity;
 
 /** Main activity in the app. */
 public class MainActivity extends AppCompatActivity {

java/admob/AppOpenExample/app/src/main/java/com/google/android/gms/example/appopenexample/SplashActivity.java

@@ -15,13 +15,14 @@
  */
 package com.google.android.gms.example.appopenexample;
 
+import android.annotation.SuppressLint;
 import android.app.Application;
 import android.content.Intent;
 import android.os.Bundle;
 import android.os.CountDownTimer;
-import androidx.appcompat.app.AppCompatActivity;
 import android.util.Log;
 import android.widget.TextView;
+import androidx.appcompat.app.AppCompatActivity;
 import com.google.android.gms.ads.MobileAds;
 import com.google.android.gms.example.appopenexample.MyApplication.OnShowAdCompleteListener;
 import java.util.concurrent.TimeUnit;
@@ -87,12 +88,14 @@ private void createTimer(long time) {
 
     CountDownTimer countDownTimer =
         new CountDownTimer(time, 1000) {
+          @SuppressLint("SetTextI18n")
           @Override
           public void onTick(long millisUntilFinished) {
             secondsRemaining = TimeUnit.MILLISECONDS.toSeconds(millisUntilFinished) + 1;
             counterTextView.setText("App is done loading in: " + secondsRemaining);
           }
 
+          @SuppressLint("SetTextI18n")
           @Override
           public void onFinish() {
             secondsRemaining = 0;

java/admob/BannerExample/app/src/main/java/com/google/android/gms/example/bannerexample/MyActivity.java

@@ -17,7 +17,6 @@
 package com.google.android.gms.example.bannerexample;
 
 import android.os.Bundle;
-import androidx.appcompat.app.AppCompatActivity;
 import android.util.DisplayMetrics;
 import android.util.Log;
 import android.view.Display;
@@ -27,6 +26,7 @@
 import android.widget.FrameLayout;
 import android.widget.PopupMenu;
 import android.widget.Toast;
+import androidx.appcompat.app.AppCompatActivity;
 import com.google.android.gms.ads.AdRequest;
 import com.google.android.gms.ads.AdSize;
 import com.google.android.gms.ads.AdView;

java/admob/FullScreenNativeExample/app/build.gradle

@@ -2,11 +2,10 @@ apply plugin: "com.android.application"
 
 android {
     namespace "com.google.example.gms.fullscreennativeexample"
-    compileSdkVersion 34
+    compileSdk 34
     defaultConfig {
         applicationId "com.google.android.gms.example.fullscreennativeexample"
         minSdkVersion 19
-        multiDexEnabled = true
         targetSdkVersion 34
         versionCode 1
         versionName "1.0"
@@ -24,6 +23,9 @@ dependencies {
     implementation 'androidx.appcompat:appcompat:1.6.1'
     implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
     implementation 'androidx.recyclerview:recyclerview:1.3.0'
-    implementation 'com.google.android.exoplayer:exoplayer:2.18.6'
-    implementation 'com.google.android.gms:play-services-ads:22.6.0'
+    implementation 'androidx.media3:media3-exoplayer:1.2.0'
+    implementation 'androidx.media3:media3-exoplayer-dash:1.2.0'
+    implementation 'androidx.media3:media3-ui:1.2.0'
+    implementation "androidx.media3:media3-session:1.2.0"
+    implementation 'com.google.android.gms:play-services-ads:22.5.0'
 }

java/admob/FullScreenNativeExample/app/src/main/AndroidManifest.xml

@@ -8,7 +8,6 @@
     <application
         android:allowBackup="true"
         android:icon="@mipmap/ic_launcher"
-        android:name="androidx.multidex.MultiDexApplication"
         android:roundIcon="@mipmap/ic_launcher_round"
         android:label="@string/app_name"
         android:networkSecurityConfig="@xml/network_security_config"

java/admob/FullScreenNativeExample/app/src/main/java/com/google/example/gms/fullscreennativeexample/ContentViewHolder.java

@@ -16,22 +16,24 @@
 
 package com.google.example.gms.fullscreennativeexample;
 
-import static com.google.android.exoplayer2.ExoPlayerLibraryInfo.TAG;
+import static android.content.ContentValues.TAG;
 
 import android.net.Uri;
 import android.util.Log;
 import android.view.View;
-import com.google.android.exoplayer2.MediaItem;
-import com.google.android.exoplayer2.Player;
-import com.google.android.exoplayer2.SimpleExoPlayer;
-import com.google.android.exoplayer2.ui.PlayerView;
-import com.google.android.exoplayer2.upstream.RawResourceDataSource;
+import androidx.annotation.OptIn;
+import androidx.media3.common.MediaItem;
+import androidx.media3.common.Player;
+import androidx.media3.common.util.UnstableApi;
+import androidx.media3.datasource.RawResourceDataSource;
+import androidx.media3.exoplayer.ExoPlayer;
+import androidx.media3.ui.PlayerView;
 import com.google.example.gms.fullscreennativeexample.FeedAdapter.ContentFeedItem;
 
 /** A ViewHolder representing video content. */
 public class ContentViewHolder extends FeedViewHolder {
   private final PlayerView playerView;
-  private final SimpleExoPlayer player;
+  private final ExoPlayer player;
 
   public ContentViewHolder(View itemView) {
     super(itemView);
@@ -44,7 +46,7 @@ public void onClick(View view) {
           }
         });
 
-    player = new SimpleExoPlayer.Builder(itemView.getContext()).build();
+    player = new ExoPlayer.Builder(itemView.getContext()).build();
     player.setRepeatMode(Player.REPEAT_MODE_ALL);
     playerView = (PlayerView) itemView.findViewById(R.id.player_view);
     playerView.setPlayer(player);
@@ -76,6 +78,7 @@ public PlayerView getPlayerView() {
   }
 
   /** Expecting the id of raw resource video file. */
+  @OptIn(markerClass = UnstableApi.class)
   public void bind(ContentFeedItem contentFeedItem, int position) {
     Player player = this.getPlayer();
     Uri uri = RawResourceDataSource.buildRawResourceUri(contentFeedItem.getResourceId());

java/admob/FullScreenNativeExample/app/src/main/java/com/google/example/gms/fullscreennativeexample/FeedAdapter.java

@@ -16,11 +16,11 @@
 
 package com.google.example.gms.fullscreennativeexample;
 
-import androidx.recyclerview.widget.RecyclerView;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import androidx.annotation.NonNull;
+import androidx.recyclerview.widget.RecyclerView;
 import com.google.android.gms.ads.nativead.NativeAd;
 import java.util.ArrayList;
 

java/admob/FullScreenNativeExample/app/src/main/java/com/google/example/gms/fullscreennativeexample/FeedViewHolder.java

@@ -16,8 +16,8 @@
 
 package com.google.example.gms.fullscreennativeexample;
 
-import androidx.recyclerview.widget.RecyclerView;
 import android.view.View;
+import androidx.recyclerview.widget.RecyclerView;
 
 /** ViewHolder instance which holds the actual feed. */
 public abstract class FeedViewHolder extends RecyclerView.ViewHolder {

java/admob/FullScreenNativeExample/app/src/main/java/com/google/example/gms/fullscreennativeexample/RecyclerViewFragment.java

@@ -17,13 +17,13 @@
 package com.google.example.gms.fullscreennativeexample;
 
 import android.os.Bundle;
-import androidx.fragment.app.Fragment;
-import androidx.recyclerview.widget.LinearLayoutManager;
-import androidx.recyclerview.widget.RecyclerView;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import androidx.fragment.app.Fragment;
+import androidx.recyclerview.widget.LinearLayoutManager;
 import androidx.recyclerview.widget.PagerSnapHelper;
+import androidx.recyclerview.widget.RecyclerView;
 import com.google.example.gms.fullscreennativeexample.FeedAdapter.AdFeedItem;
 import com.google.example.gms.fullscreennativeexample.NativeAdsPool.OnPoolRefreshedListener;
 
@@ -60,7 +60,8 @@ public View onCreateView(
     nativeAdsPool = new NativeAdsPool(this.getContext());
     nativeAdsPool.init(
         (OnPoolRefreshedListener) () -> feedAdapter.add(new AdFeedItem(nativeAdsPool.pop())));
-    nativeAdsPool.refresh(/* numOfAds= */ 5);
+    // numOfAds=
+    nativeAdsPool.refresh(5);
     return rootView;
   }
 }