如何创建Android广告插播式广告？

我不明白它在InterstitialAd和我coudnt找到任何example.if你有一个例子，你可以发布它。我尝试旗帜，是它的工作原理。但是当我尝试在InterstitialAd我得到error.i希望当我打开应用程序，我想看到​​的广告。

i dont get it InterstitialAd and i coudnt find any example.if you have a example, can you post it .i try banner is it works . but when i try InterstitialAd i get error.i want when i open app i wanna see ads .

谢谢！

package com.example.reklam3;

import android.app.Activity;

import com.google.ads.*;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

import com.google.ads.Ad;
import com.google.ads.AdListener;
import com.google.ads.AdRequest;
import com.google.ads.AdRequest.ErrorCode;
import com.google.ads.InterstitialAd;

public class MainActivity extends Activity implements AdListener{

  private InterstitialAd interstitial;

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

    // Create the interstitial
    interstitial = new InterstitialAd(this,"ca-app-pub-90707885707358xx");

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

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

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

  @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

}
}

如果你有一个sipmle〔实施例，你可以将它张贴.ty

if you have a sipmle examle can you post it .ty