- #1
Darkmisc
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- TL;DR Summary
- I copied code from the Admob developer page for a rewarded ad and it doesn't work. I get a Null Pointer Exception.
Hi everyone
I've cut and pasted code from here to test rewarded interstitial ads. https://developers.google.com/admob/android/rewarded-interstitial
The only change I've made is to call the ad upon a button click.
When I click the button to call the ad, the program crashes and makes reference to a Null Pointer Exception caused by the following lines:
Does anyone know why this is happening?
Full code and stacktrace below.
Thanks
Here is the stacktrace.
I've cut and pasted code from here to test rewarded interstitial ads. https://developers.google.com/admob/android/rewarded-interstitial
The only change I've made is to call the ad upon a button click.
When I click the button to call the ad, the program crashes and makes reference to a Null Pointer Exception caused by the following lines:
line with error:
rewardedInterstitialAd.show(/* Activity */ MainActivity.this,/*
OnUserEarnedRewardListener */ MainActivity.this);Does anyone know why this is happening?
Full code and stacktrace below.
Thanks
MainActivity:
import static androidx.constraintlayout.helper.widget.MotionEffect.TAG;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import android.annotation.SuppressLint;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
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.OnUserEarnedRewardListener;
import com.google.android.gms.ads.initialization.InitializationStatus;
import com.google.android.gms.ads.initialization.OnInitializationCompleteListener;
import com.google.android.gms.ads.rewarded.RewardItem;
import com.google.android.gms.ads.rewardedinterstitial.RewardedInterstitialAd;
import com.google.android.gms.ads.rewardedinterstitial.RewardedInterstitialAdLoadCallback;
public class MainActivity extends AppCompatActivity implements OnUserEarnedRewardListener {
private RewardedInterstitialAd rewardedInterstitialAd;
private String TAG = "MainActivity";
TextView textView;
Button button;
int value;
@Override
public void onUserEarnedReward(@NonNull RewardItem rewardItem) {
Log.i(TAG, "User earned reward.");
value++;
textView.setText(String.valueOf(value));
}
@SuppressLint("MissingInflatedId")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
int value =0;
textView = findViewById(R.id.textView);
textView.setText(String.valueOf(value));
button = findViewById(R.id.button); MobileAds.initialize(this, new OnInitializationCompleteListener() {
@Override
public void onInitializationComplete(InitializationStatus initializationStatus) {
}
});
loadAd();
}
public void onClick (View view){
**rewardedInterstitialAd.show(/* Activity */ MainActivity.this,/*
OnUserEarnedRewardListener */ MainActivity.this);**
}
public void loadAd(){
RewardedInterstitialAd.load(MainActivity.this, "ca-app-pub-3940256099942544/5354046379",
new AdRequest.Builder().build(), new RewardedInterstitialAdLoadCallback() {
@Override
public void onAdLoaded(RewardedInterstitialAd ad) {
rewardedInterstitialAd = ad;
rewardedInterstitialAd.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.");
rewardedInterstitialAd = null;
}
@Override
public void onAdFailedToShowFullScreenContent(AdError adError) {
// Called when ad fails to show.
Log.e(TAG, "Ad failed to show fullscreen content.");
rewardedInterstitialAd = 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.");
}
});
}
@Override
public void onAdFailedToLoad(LoadAdError loadAdError) {
Log.d(TAG, loadAdError.toString());
rewardedInterstitialAd = null;
}
});
}
}Here is the stacktrace.
stacktrace:
E FATAL EXCEPTION: main
Process: com.xxmassdeveloper.rewardedads2, PID: 20217
java.lang.IllegalStateException: Could not execute method for android:onClick
at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:473)
at android.view.View.performClick(View.java:7870)
at android.widget.TextView.performClick(TextView.java:14970)
at com.google.android.material.button.MaterialButton.performClick(MaterialButton.java:1202)
at android.view.View.performClickInternal(View.java:7839)
at android.view.View.access$3600(View.java:886)
at android.view.View$PerformClick.run(View.java:29363)
at android.os.Handler.handleCallback(Handler.java:883)
at android.os.Handler.dispatchMessage(Handler.java:100)
at android.os.Looper.loop(Looper.java:237)
at android.app.ActivityThread.main(ActivityThread.java:7948)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1075)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:468)
at android.view.View.performClick(View.java:7870)
at android.widget.TextView.performClick(TextView.java:14970)
at com.google.android.material.button.MaterialButton.performClick(MaterialButton.java:1202)
at android.view.View.performClickInternal(View.java:7839)
at android.view.View.access$3600(View.java:886)
at android.view.View$PerformClick.run(View.java:29363)
at android.os.Handler.handleCallback(Handler.java:883)
at android.os.Handler.dispatchMessage(Handler.java:100)
at android.os.Looper.loop(Looper.java:237)
at android.app.ActivityThread.main(ActivityThread.java:7948)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1075)
**Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.google.android.gms.ads.rewardedinterstitial.RewardedInterstitialAd.show(android.app.Activity, com.google.android.gms.ads.OnUserEarnedRewardListener)' on a null object reference
at com.xxmassdeveloper.rewardedads2.MainActivity.onClick(MainActivity.java:64)**
at java.lang.reflect.Method.invoke(Native Method)
at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:468)
at android.view.View.performClick(View.java:7870)
at android.widget.TextView.performClick(TextView.java:14970)
at com.google.android.material.button.MaterialButton.performClick(MaterialButton.java:1202)
at android.view.View.performClickInternal(View.java:7839)
at android.view.View.access$3600(View.java:886)
at android.view.View$PerformClick.run(View.java:29363)
at android.os.Handler.handleCallback(Handler.java:883)
at android.os.Handler.dispatchMessage(Handler.java:100)
at android.os.Looper.loop(Looper.java:237)
at android.app.ActivityThread.main(ActivityThread.java:7948)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1075)
2023-02-01 10:30:03.908 20217-20217 Process com.xxmassdeveloper.rewardedads2 I Sending signal. PID: 20217 SIG: 9
---------------------------- PROCESS ENDED (20217) for package com.xxmassdeveloper.rewardedads2 ----------------------------
2023-02-01 10:30:04.207 3675-5653 WindowManager pid-3675 E win=Window{81ddba7 u0 com.xxmassdeveloper.rewardedads2/com.xxmassdeveloper.rewardedads2.MainActivity EXITING} destroySurfaces: appStopped=false win.mWindowRemovalAllowed=true win.mRemoveOnExit=true win.mViewVisibility=0 caller=com.android.server.wm.AppWindowToken.destroySurfaces:1200 com.android.server.wm.AppWindowToken.destroySurfaces:1181 com.android.server.wm.WindowState.onExitAnimationDone:5030 com.android.server.wm.-$$Lambda$01bPtngJg5AqEoOWfW3rWfV7MH4.accept:2 java.util.ArrayList.forEach:1262 com.android.server.wm.AppWindowToken.onAnimationFinished:3549 com.android.server.wm.AppWindowToken.commitVisibility:860
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