I write a AsyncTask as below:

class Load extends AsyncTask<String, String, String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected String doInBackground(String... aurl) {
//do job seconds
//stop at here, and does not run onPostExecute
}
@Override
protected void onPostExecute(String unused) {
super.onPostExecute(unused);
wait = false;
new Load().execute();
}
}

And the other method as below:

public void click() {
new Load().execute();
while(wait) {
;
}
}

The wait is a global boolean value.