可以在同一个Activity中同时实施Admob横幅广告和插页式广告，只需要在代码中分别定义两个adView对象即可。具体代码示例如下：

//导入Admob广告SDK import com.google.android.gms.ads.AdView; import com.google.android.gms.ads.InterstitialAd;

public class MainActivity extends AppCompatActivity {

private AdView mAdView;
private InterstitialAd mInterstitialAd;

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

    //加载横幅广告
    mAdView = findViewById(R.id.adView);
    AdRequest adRequest = new AdRequest.Builder().build();
    mAdView.loadAd(adRequest);

    //加载插页式广告
    mInterstitialAd = new InterstitialAd(this);
    mInterstitialAd.setAdUnitId("你的插页式广告ID");
    mInterstitialAd.loadAd(new AdRequest.Builder().build());

    //监听插页式广告是否加载完成
    mInterstitialAd.setAdListener(new AdListener() {
        @Override
        public void onAdLoaded() {
            //如果广告加载完成，则显示广告
            mInterstitialAd.show();
        }
    });
}

}