How do I show an interstitial ad when an application closes?

Question

I have this code, and works perfectly, but the ad is showed when i start the app, and i want to show the ad when I press back(to exit app) and press yes. So when finish(); happened, I want to show my interstitial ad.

package inter.ad;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.ActivityNotFoundException;
import android.content.DialogInterface;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.KeyEvent;
import android.widget.Toast;

import com.google.ads.*;
import com.google.ads.AdRequest.ErrorCode;



public class MainActivity extends Activity implements AdListener {

  private InterstitialAd interstitial;

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    // Create the interstitial
    interstitial = new InterstitialAd(this, "my ad id");

    // Create ad request
    AdRequest adRequest = new AdRequest();

    // Begin loading your interstitial
    interstitial.loadAd(adRequest);

    // Set Ad Listener to use the callbacks below
    interstitial.setAdListener(this);
  }

  @Override
  public void onReceiveAd(Ad ad) {
    Log.d("OK", "Received ad");
    if (ad == interstitial) {
      interstitial.show();
    }
  }

@Override
public void onDismissScreen(Ad arg0) {
    // TODO Auto-generated method stub

}

@Override
public void onFailedToReceiveAd(Ad arg0, ErrorCode arg1) {
    // TODO Auto-generated method stub

}

@Override
public void onLeaveApplication(Ad arg0) {
    // TODO Auto-generated method stub

}

@Override
public void onPresentScreen(Ad arg0) {
    // TODO Auto-generated method stub

}



public boolean onKeyDown(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_BACK) {
        exitByBackKey();

        //moveTaskToBack(false);

        return true;
    }
    return super.onKeyDown(keyCode, event);
}
protected void exitByBackKey() {

    AlertDialog alertbox = new AlertDialog.Builder(this)
    .setMessage("Do you want to Exit?")
    .setPositiveButton("Yes", new DialogInterface.OnClickListener() {

        // do something when the button is clicked
        public void onClick(DialogInterface arg0, int arg1) {

            finish();
            //close();


        }
    })

    .setNeutralButton("Rate us!", new DialogInterface.OnClickListener() {

        // do something when the button is clicked
        public void onClick(DialogInterface arg0, int arg1) {

             {
                Uri uri = Uri.parse("market://details?id=" + getPackageName());
                Intent goToMarket = new Intent(Intent.ACTION_VIEW, uri);
                try {
                    startActivity(goToMarket);
                } catch (ActivityNotFoundException e) {
                    Toast.makeText(getApplicationContext(), "Couldn´t launch Google Play", 
                            Toast.LENGTH_LONG).show();
                }
            }


        }
    })

    .setNegativeButton("No", new DialogInterface.OnClickListener() {

        // do something when the button is clicked
        public void onClick(DialogInterface arg0, int arg1) {
                       }
    })
      .show();
    }
 }

Answer 1

Don't do this.

Interstitial ads are fine for when you're staying in the app, but I guarantee when you try to spam them as they exit the app, their fingers will stray very quickly to the "uninstall" button.

If you want to do things when the activity is leaving focus, it belongs in onPause(), onStop() or onDestroy() depending on the level of control you need.

Take a look at the Android documentation on exactly how to do this.