Crosswalk XWalkResourceClient

How can I implement WebviewClient(XWalkResourceClient) so my app opens external Urls. At the moment is opens all Urls Internal. I tried with different examples but its not calling external Urls.

public class MainActivity extends Activity {
private XWalkView xWalkWebView;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    xWalkWebView=(XWalkView)findViewById(R.id.xwalkWebView);
            xWalkWebView.load("http://cityfind.co/", null);



    // turn on debugging
    XWalkPreferences.setValue(XWalkPreferences.REMOTE_DEBUGGING, true);
}

@Override
protected void onPause() {
    super.onPause();
    if (xWalkWebView != null) {
        xWalkWebView.pauseTimers();
        xWalkWebView.onHide();
    }
}

@Override
protected void onResume() {
    super.onResume();
    if (xWalkWebView != null) {
        xWalkWebView.resumeTimers();
        xWalkWebView.onShow();
    }
}

@Override
protected void onDestroy() {
    super.onDestroy();
    if (xWalkWebView != null) {
        xWalkWebView.onDestroy();
    }
}

}