My Android app is crashing after implementing Interstitial ads

[Joaquim Mussassa]

I followed the tutorial for ADmob Interstitial ads (on their site) and my app started crashing on the emulator. Here is the code:
package com.urbannet.kubulabotfree;

import android.app.DownloadManager;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import android.util.Log;
import android.view.ContextMenu;
import android.view.MenuItem;
import android.view.View;
import android.webkit.URLUtil;
import android.webkit.WebResourceRequest;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Toast;

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;

import kubulabotfree.R;

public class MainActivity extends AppCompatActivity {
public static final String TAG = "MainActivity";
private InterstitialAd mInterstitialAd;
private WebView myWebView;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
MobileAds.initialize(this, new OnInitializationCompleteListener() {
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(@NonNull 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(MainActivity.this);
} else {
Log.d("TAG", "The interstitial ad wasn't ready yet.");
}

myWebView = (WebView) findViewById(R.id.webView);
WebSettings webSettings = myWebView.getSettings();

webSettings.setJavaScriptEnabled(true);
//improve webView performance
//myWebView.getSettings().setRenderPriority(WebSettings.RenderPriority.HIGH);
//myWebView.getSettings().setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);
//myWebView.getSettings().setAppCacheEnabled(true);
myWebView.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);
webSettings.setDomStorageEnabled(true);
//webSettings.setLayoutAlgorithm(WebSettings.LayoutAlgorithm.NARROW_COLUMNS);
//webSettings.setUseWideViewPort(true);
//webSettings.setSavePassword(true);
webSettings.setSaveFormData(true);
//webSettings.setEnableSmoothTransition(true);

myWebView.getSettings().setPluginState(WebSettings.PluginState.ON);
myWebView.loadUrl("https://kubulabotfree.soundtrip.store/");
//myWebView.setWebViewClient(new WebViewClient());

myWebView.setWebViewClient(new WebViewClient() {
@Override
public boolean shouldOverrideUrlLoading(WebView view, WebResourceRequest request) {

if((String.valueOf(request.getUrl())).contains("https://kubulabotfree.soundtrip.store/")) {
view.loadUrl(String.valueOf(request.getUrl()));
} else {
Intent intent = new Intent(Intent.ACTION_VIEW, request.getUrl());
view.getContext().startActivity(intent);
}

return true;
}
});

}

@Override
public void onCreateContextMenu(ContextMenu contextMenu, View view, ContextMenu.ContextMenuInfo contextMenuInfo) {
super.onCreateContextMenu(contextMenu, view, contextMenuInfo);

final WebView.HitTestResult webViewHitTestResult = myWebView.getHitTestResult();

if (webViewHitTestResult.getType() == WebView.HitTestResult.IMAGE_TYPE ||
webViewHitTestResult.getType() == WebView.HitTestResult.SRC_IMAGE_ANCHOR_TYPE) {

contextMenu.setHeaderTitle("Download Image From Below");

contextMenu.add(0, 1, 0, "Save - Download Image")
.setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
@Override
public boolean onMenuItemClick(MenuItem menuItem) {

String DownloadImageURL = webViewHitTestResult.getExtra();

if (URLUtil.isValidUrl(DownloadImageURL)) {

DownloadManager.Request request = new DownloadManager.Request(Uri.parse(DownloadImageURL));
request.allowScanningByMediaScanner();
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
DownloadManager downloadManager = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
downloadManager.enqueue(request);

Toast.makeText(MainActivity.this, "Image Downloaded Successfully.", Toast.LENGTH_LONG).show();
} else {
Toast.makeText(MainActivity.this, "Sorry.. Something Went Wrong.", Toast.LENGTH_LONG).show();
}
return false;
}
});
}

}

@Override
public void onBackPressed() {
if (myWebView.canGoBack()) {
myWebView.goBack();
} else {
super.onBackPressed();

}

}

}

[Mobile Ads SDK Forum Advisor]

Hi,

Thank you for reaching out to us.

For us to better check this in our end, we may request the following information below aside from the code you've used below.

• Sample app project that the crashes is reproducible
• Steps to replicate
• SDK versions
• App ID
• Device name and versions affected
• Full stack trace of the crashes

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Mobile Ads SDK Team