public class FacebookTestActivity extends DroidGap {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        super.loadUrl("file:///android_asset/www/index.html");
    }
}

this.cordova.getThreadPool().execute(new Runnable() {
    @Override
    public void run() {

       super.loadUrl("file:///android_asset/www/index.html");
    }

});