Android：AsyncTask中的HTTP请求不是并发的 [英] Android: HTTP requests in AsyncTask are not concurrent

问题描述

我在为）具有所有详细信息。

I'm writing a fan app for my local cinematheque, which shows the screening calendar for the next few days. The per-day film list is retrieved using a parametrized HTTP call from the site (The answer contains Hebrew, so if you clicked the link and got some Gibberish it's probably OK).

The app displays the schedule for the next eight days, so It makes 8 calls with per-day schedule request.

private class GetMoviesTask extends AsyncTask<Integer, Void, List<Film>>

doInBackground() retrieves the list of films per day, and onPostExecute() updates the interface.

The AsyncTask is called from MainActivity.onCreate():

for (int i=0; i<NUMBER_OF_DAYS_TO_VIEW; i++){
    new GetMoviesTask().execute(i);
}

The problem is that AsyncTask is not executed concurrently. The days are slowly loaded one after another, which is painfully slow:

What's the best way to start these AsyncCalls concurrently?

解决方案

AsyncTask has been known to hit a regression in Android 4.x, where the system executes them one at a time instead of executing them concurrently as it did since Android 1.6. This is by design: basically, on newer platforms, you can revert to the old concurrent behaviour by calling executeOnExecutor() instead of execute(). Mark Murphy (known as Commonsware on StackOverflow) has all the details sorted on his blog.

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