如何避免链接数AsyncTask的电话？ [英] How to avoid chaining several AsyncTask calls?

问题描述

我不得不多次调用Web服务，但每一步都使用从previous一步的值，所以现在我有一个巨大AsyncTasks链：每个AsyncTask的是在onPostExecute）的执行（ AsyncTask的在previous步骤。这是非常非常难看，而且很难修改。我怎样才能避免这种情况？我希望把每一步一个单独的函数：

I have to make several calls to a web service, but each step uses the values from the previous step, so right now I have a huge chain of AsyncTasks: each AsyncTask is executed in the onPostExecute() of the AsyncTask of the previous step. This is very very ugly, and very hard to modify. How can I avoid this? I would like to put each step in a separate function:

int step5() //this function is on the main UI thread
{
   return getStep5ValuesFromWebService() + valuesFromPreviousSteps;
}

int getStep5ValuesFromWebService()
{
   //do work on new thread
   //GetValueFromService(); <-- this is the function that returns an int from the web service, but it has to be called from another thread
}

如何调GetValueFromService（），从而使步骤5（）函数返回GetValueFromService（）函数计算出的值α

How to call GetValueFromService() so that the step5() function returns the value calculated in the GetValueFromService() function?

推荐答案

可以这样做：

private class MyAsync extends AsyncTask<String, Integer, Long> {

    protected Long doInBackground(String... symbols) {
        step1();
        step2();
        step3();
        step4();
        step5();
    }

    private void step1(){}
    private void step2(){}
    private void step3(){}
    private void step4(){}
    private void step5(){}

    protected void onProgressUpdate(Integer... progress) {
    }

    protected void onPostExecute(Long result) {
    }
}

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