java - Android AsyncTask 等待完成

Question

我正在 Android 应用程序中使用 AsyncTask 调用 Web 服务，但我不知道如何等待 onPostExecute 完成:

//Call Async Web Service here 
AsyncCallWS task = new AsyncCallWS();
task.execute();
//Need to wait to fill this in ** Its not  waiting.
String sCall = rslt;
String[] aCall = sCall.split("//|");

private class AsyncCallWS extends AsyncTask<Void, Void, Void> {
    @Override
    protected void onPreExecute() {
        Log.i(TAG, "onPreExecute");
    }
    @Override
    protected Void doInBackground(Void... params) {
        Log.i(TAG, "doInBackground");
        GetURL();
        return null;
    }
    @Override
    protected void onPostExecute(Void result) {
        Log.i(TAG, "onPostExecute");
        try{
            //Results HERE
            rslt = resultString.toString();
        }
        catch(Exception ex)
        {rslt = ex.toString()+ "|" + ex.toString();}

    }
}

Answer 1

我不清楚你不能/不想从 onPostExecute 做什么，但是如果你想执行与任务不耦合的东西(这样你就可以运行任务)，你可以使用回调从任何地方)

private class OnFinishedListener {
    void onFinished(String rslt);
}

private class AsyncCallWS extends AsyncTask<Void, Void, Void> {

    private OnFinishedListener mAfter;

    public AsyncCallWS(OnFinishedListener after) {
        mAfter = after;
    }

    ...

    @Override
    protected void onPostExecute(Void result) {
        ....
        if (mAfter != null) {
            //you didnt illustrate what resultString is, you might
            //want this to be the returned value from doInBackground
            mAfter.onFinished(resultString.toString());
        }
    }

}

使用

new AsyncCallWS(new OnFinishedListener {
    public void onFinished(String rslt) {
        //for example
        String sCall = rslt;
        String[] aCall = sCall.split("//|");
    }
}).execute();