无法将admob添加到libgdx项目

android {
    // ...
    dependencies {
        implementation 'com.google.android.gms:play-services-ads:20.4.0'
    }
}

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

public class AndroidLauncher extends AndroidApplication {

    private AdView adView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // 创建AdView对象
        adView = new AdView(this);
        adView.setAdSize(AdSize.BANNER);
        adView.setAdUnitId("YOUR_AD_UNIT_ID");

        // 将AdView添加到布局中
        RelativeLayout layout = new RelativeLayout(this);
        layout.addView(adView, RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);

        // 设置布局为主视图
        setContentView(layout);

        // 加载广告
        AdRequest adRequest = new AdRequest.Builder().build();
        adView.loadAd(adRequest);
    }

    // ...
}

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />