안드로이드 구글 애드몹 전면광고 넣기

package com.example;

import com.google.android.gms.ads.AdRequest;
import com.google.android.gms.ads.AdView;
import com.google.android.gms.ads.InterstitialAd;

import android.app.Activity;
import android.widget.Toast;

public class BackPressCloseHandler {

    private long backKeyPressedTime = 0;
    private Toast toast;
    
    private Activity activity;
    private InterstitialAd interstitial;
    
    public BackPressCloseHandler(Activity context)
    {
        this.activity = context;
        Start ();
    }
    
    void Start () {
        // ads
        
        interstitial = new InterstitialAd(this.activity);
        interstitial.setAdUnitId("ca-app-pub-**********************");
      
        // Create an empty ad request.
        AdRequest request = new AdRequest.Builder().build();
        // Load the Ads with the request.
        
        interstitial.loadAd(request);
    }
    
    
    public void onBackPressed()
    {
        if(System.currentTimeMillis() > backKeyPressedTime + 2000)
        {
            backKeyPressedTime = System.currentTimeMillis();
            showToast();
            return;
        }
        
        if(System.currentTimeMillis() <= backKeyPressedTime + 2000)
        {
//            activity.finish();
            Utils.ShutdownApplication();
            toast.cancel();
            if(interstitial != null)
            {
                interstitial.show();
            }
        }
    }
    
    private void showToast()
    {
        toast = Toast.makeText(activity, "\'뒤로\' 버튼을 한번 더 누르시면 종료됩니다.", Toast.LENGTH_SHORT);
        toast.show();
    }
}

위의 코드로 Java Class를 만들고 각 화면 Activity에서 해당 Class를 이용하면 된다.
아래 코드는 각 Activity에서 사용하는 부분이다. 핵심적인 부분만 코드로 남겨둔다.

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
//        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_main);
        
            backPressClosehandler = new BackPressCloseHandler(this);
}