Android: HTTP requests in AsyncTask are not parallel

Question

I am writing an application for fans of my local cinema , which shows the calendar for the next few days. The list of films for each day is retrieved using a parameterized HTTP call from the site (the answer contains Hebrew, so if you clicked on a link and got some gibberish it's probably OK).

The application displays the schedule for the next eight days, so it makes 8 calls requesting the schedule for the day.

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

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

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 running at the same time. Days load slowly one by one, which is very slow:

What is the best way to run these AsyncCalls at the same time?

Answer 1

AsyncTask , as you know, gets into regression in Android 4.x, where the system executes them one at a time, and does not execute them at the same time, as it did with Android 1.6. This is by design: basically, on newer platforms, you can revert to the old parallel behavior by calling executeOnExecutor() instead of execute() . Mark Murphy (known as Commonsware at StackOverflow) has all the details sorted on his blog.

Answer 2

Basically, AsyncTask creates only one thread for you, which runs in the background.

You can achieve what you want in two ways.

• First, you can create separate AsyncTasks for each of the operations.
• Secondly, by creating multiple threads in the doInBackground method and creating parallel requests and processes. After that, you can notify your user interface by publishing them to onProgressUpdate or onPostExecute.

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