AsyncTask 不能调用onPostExecute()方法

Question

enter code hereAsyncTask类如下：

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();
}
}

另外一个方法如下：

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

wait是boolean值。
为什么AsyncTask 不能调用onPostExecute()方法呢？

Answer 1

private class AsyncTask extends AsyncTask<Void, Void, Void> {
        ProgressDialog progressDialog;

        @Override
        protected void onPreExecute() {
            super.onPreExecute();

        }

        @Override
        protected Void doInBackground(Void... params) {

        }

        @Override
        protected void onPostExecute(Void result) {
            super.onPostExecute(result);
            progressDialog.dismiss();

        }
    }

        }

        @Override
        protected void onPostExecute(Void result) {
            super.onPostExecute(result);
            progressDialog.dismiss();

        }
    }