java - 如何避免链接多个 AsyncTask 调用？

Question

我必须多次调用 Web 服务，但每一步都使用上一步的值，所以现在我有一个巨大的 AsyncTask 链:每个 AsyncTask 都在前一步。这非常非常难看，而且很难修改。我怎样才能避免这种情况？我想将每个步骤放在一个单独的函数中:

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
}

如何调用 GetValueFromService() 以便 step5() 函数返回在 GetValueFromService() 函数中计算的值？

Answer 1

你能不能做:

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) {
    }
}