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How To Change Admob AppID Using Firebase

 try {

    ApplicationInfo ai = getPackageManager().getApplicationInfo(getPackageName(), PackageManager.GET_META_DATA);
    Bundle bundle = ai.metaData;
    String myApiKey = bundle.getString("com.google.android.gms.ads.APPLICATION_ID");

    ai.metaData.putString("com.google.android.gms.ads.APPLICATION_ID", adUnitId);//you can replace your key APPLICATION_ID here
    String ApiKey = bundle.getString("com.google.android.gms.ads.APPLICATION_ID");

    unit.setText(ApiKey);



} catch (PackageManager.NameNotFoundException e) {

} catch (NullPointerException e) {

}