How to show interstitial ads after loading the home screen?

Question

I need help, I would like to display an interstitial ad after the home screen loads, but my code is giving the following failure:

java.lang.Illegalstateexception: isLoaded must be called on the main UI thread.

Here is my code:

public class SplashScreenActivity extends AppCompatActivity {

    InterstitialAd mInterstitialAd;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_splash_screen);

        // FIREBASE INTERSTICIAL
        mInterstitialAd = new InterstitialAd(this);
        mInterstitialAd.setAdUnitId("ca-app-pub-2565065222479596/3931476543");

        mInterstitialAd.setAdListener(new AdListener() {
            @Override
            public void onAdClosed() {
                requestNewInterstitial();
            }
        });

        requestNewInterstitial();

        Toast.makeText(this,"* Necessário Acesso a Internet *",Toast.LENGTH_LONG).show();

        Thread timerThread = new Thread() {
            public void run() {
                try {
                    sleep(5000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                } finally {

                    if (mInterstitialAd.isLoaded()) {
                        mInterstitialAd.show();
                        Intent intent = new Intent(SplashScreenActivity.this, MainActivity.class);
                        startActivity(intent);
                    }
                    else
                    {
                        Intent intent = new Intent(SplashScreenActivity.this, MainActivity.class);
                    }
                }

            }
        };
        timerThread.start();

    }

    // FIREBASE INTERSTICIAL
    private void requestNewInterstitial() {
        AdRequest adRequest = new AdRequest.Builder()
                .addTestDevice("SEE_YOUR_LOGCAT_TO_GET_YOUR_DEVICE_ID")
                .build();

        mInterstitialAd.loadAd(adRequest);
    }

}

DEBUG:

    01-22 16:27:03.048 13840-13970/? E/AndroidRuntime: FATAL EXCEPTION: Thread-6
    Process: idea.tisco.pepavideos, PID: 13840
    java.lang.IllegalStateException: isLoaded must be called on the main UI thread.
    at oc.b(:com.google.android.gms.DynamiteModulesA@11951448:20)
    at com.google.android.gms.ads.internal.a.d(:com.google.android.gms.DynamiteModulesA@11951448:98)
    at com.google.android.gms.ads.internal.client.ak.onTransact(:com.google.android.gms.DynamiteModulesA@11951448:14)
    at android.os.Binder.transact(Binder.java:499)
    at com.google.android.gms.internal.zzep$zza$zza.isReady(Unknown Source)
    at com.google.android.gms.internal.zzfa.isLoaded(Unknown Source)
    at com.google.android.gms.ads.InterstitialAd.isLoaded(Unknown Source)
    at company.ts.SplashScreenActivity$2.run(SplashScreenActivity.java:50)

Even after debugging, I couldn’t understand the reason for the error.

I would just like to display an interstitial right after the home screen or when I open the main activity.

Thank you very much!

Answer 1

When you create a thread on Android, you nay can modify the thread user interface directly. It is necessary to use the method runOnUiThread.

Thus:

runOnUiThread(new Runnable() {
    @Override
    public void run() {
        if (mInterstitialAd.isLoaded()) {
            mInterstitialAd.show();
        }
    }
});

And to carry the InterstitialAd, just add the code below in your method onCreate

mInterstitialAd = new InterstitialAd(this);
mInterstitialAd.setAdUnitId("ca-app-pub-2565065222479596/3931476543");
mInterstitialAd.loadAd(new AdRequest.Builder().build());