I recently wanted to implement Interstitial Ads in my app, but I soon realized that showing the ad crashes the app. I isolated the code into another activity, to make sure it’s not tampered by anything, but no luck.
Here’s the isolated activity:
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import com.google.android.gms.ads.AdError;
import com.google.android.gms.ads.AdRequest;
import com.google.android.gms.ads.FullScreenContentCallback;
import com.google.android.gms.ads.LoadAdError;
import com.google.android.gms.ads.MobileAds;
import com.google.android.gms.ads.initialization.InitializationStatus;
import com.google.android.gms.ads.initialization.OnInitializationCompleteListener;
import com.google.android.gms.ads.interstitial.InterstitialAd;
import com.google.android.gms.ads.interstitial.InterstitialAdLoadCallback;
public class InterstitialAdsPleaseDontCrash extends AppCompatActivity {
public static final String TAG = "Test Tag";
private InterstitialAd mInterstitialAd;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_interstitial_ads_please_dont_crash);
MobileAds.initialize(this, new OnInitializationCompleteListener() {
@Override
public void onInitializationComplete(InitializationStatus initializationStatus) {
}
});
AdRequest adRequest = new AdRequest.Builder().build();
InterstitialAd.load(this, "ca-app-pub-3940256099942544/1033173712", adRequest,
new InterstitialAdLoadCallback() {
@Override
public void onAdLoaded(@NonNull InterstitialAd interstitialAd) {
// The mInterstitialAd reference will be null until
// an ad is loaded.
mInterstitialAd = interstitialAd;
Log.i(TAG, "onAdLoaded");
}
@Override
public void onAdFailedToLoad(@NonNull LoadAdError loadAdError) {
// Handle the error
Log.d(TAG, loadAdError.toString());
mInterstitialAd = null;
}
});
mInterstitialAd.setFullScreenContentCallback(new FullScreenContentCallback(){
@Override
public void onAdClicked() {
// Called when a click is recorded for an ad.
Log.d(TAG, "Ad was clicked.");
}
@Override
public void onAdDismissedFullScreenContent() {
// Called when ad is dismissed.
// Set the ad reference to null so you don't show the ad a second time.
Log.d(TAG, "Ad dismissed fullscreen content.");
mInterstitialAd = null;
}
@Override
public void onAdFailedToShowFullScreenContent(AdError adError) {
// Called when ad fails to show.
Log.e(TAG, "Ad failed to show fullscreen content.");
mInterstitialAd = null;
}
@Override
public void onAdImpression() {
// Called when an impression is recorded for an ad.
Log.d(TAG, "Ad recorded an impression.");
}
@Override
public void onAdShowedFullScreenContent() {
// Called when ad is shown.
Log.d(TAG, "Ad showed fullscreen content.");
}
});
if (mInterstitialAd != null) {
mInterstitialAd.show(InterstitialAdsPleaseDontCrash.this);
} else {
Log.d("TAG", "The interstitial ad wasn't ready yet.");
}
}
}
Seems like the FullScreenContentCallback is causing issues.
Here’s the error log:
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.rodo.fakeupdate, PID: 22522
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.rodo.fakeupdate/com.rodo.fakeupdate.InterstitialAdsPleaseDontCrash}: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.google.android.gms.ads.interstitial.InterstitialAd.setFullScreenContentCallback(com.google.android.gms.ads.FullScreenContentCallback)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:4035)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:4201)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:103)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2438)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loopOnce(Looper.java:226)
at android.os.Looper.loop(Looper.java:313)
at android.app.ActivityThread.main(ActivityThread.java:8669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:571)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1135)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.google.android.gms.ads.interstitial.InterstitialAd.setFullScreenContentCallback(com.google.android.gms.ads.FullScreenContentCallback)' on a null object reference
at com.rodo.fakeupdate.InterstitialAdsPleaseDontCrash.onCreate(InterstitialAdsPleaseDontCrash.java:54)
at android.app.Activity.performCreate(Activity.java:8290)
at android.app.Activity.performCreate(Activity.java:8270)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1329)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:4009)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:4201)Â
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:103)Â
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)Â
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)Â
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2438)Â
at android.os.Handler.dispatchMessage(Handler.java:106)Â
at android.os.Looper.loopOnce(Looper.java:226)Â
at android.os.Looper.loop(Looper.java:313)Â
at android.app.ActivityThread.main(ActivityThread.java:8669)Â
at java.lang.reflect.Method.invoke(Native Method)Â
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:571)Â
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1135)Â
>Solution :
You should check mInterstitialAd object not to be null before attaching it with setFullScreenContentCallback.
if (mInterstitialAd != null) {
mInterstitialAd.setFullScreenContentCallback(new FullScreenContentCallback(){
@Override
public void onAdClicked() {
// Called when a click is recorded for an ad.
Log.d(TAG, "Ad was clicked.");
}
@Override
public void onAdDismissedFullScreenContent() {
// Called when ad is dismissed.
// Set the ad reference to null so you don't show the ad a second time.
Log.d(TAG, "Ad dismissed fullscreen content.");
mInterstitialAd = null;
}
@Override
public void onAdFailedToShowFullScreenContent(AdError adError) {
// Called when ad fails to show.
Log.e(TAG, "Ad failed to show fullscreen content.");
mInterstitialAd = null;
}
@Override
public void onAdImpression() {
// Called when an impression is recorded for an ad.
Log.d(TAG, "Ad recorded an impression.");
}
@Override
public void onAdShowedFullScreenContent() {
// Called when ad is shown.
Log.d(TAG, "Ad showed fullscreen content.");
}
});
mInterstitialAd.show(InterstitialAdsPleaseDontCrash.this);
} else {
Log.d("TAG", "The interstitial ad wasn't ready yet.");
}