Asynchronous Tasks with Android Anthony Dahanne, Ing Jr identi.ca/twitter blog : Android Montreal, le 01/09/2010.

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Presentation transcript:

Asynchronous Tasks with Android Anthony Dahanne, Ing Jr identi.ca/twitter blog : Android Montreal, le 01/09/2010

Content Why should I care about multi threading ? What are the options ? AsyncTasks to the rescue ! AsyncTask API : the lifecycle AsyncTask API : real life example (demo) Q&A

Why should I care about threading ? Remote calls (Http) Intense computing (media manipulation) One thread = Frustrated user !

Why should I care about threading ? Remote calls (Http) Intense computing (media manipulation) Many threads = Happy user

What are the options ? Or you can try THE REAL THING ! Handler based API : Activity.runOnUiThread(Runnable) View.post(Runnable) View.postDelayed(Runnable, long) And.... Handler ! (android.os.Handler)

AsyncTasks to the rescue ! Asynctask API : Something doInBackground(String... params) { return null; } protected void onPreExecute() { } protected void onPostExecute(Something b) { } protected void onProgressUpdate(Ty... values) { } The best way to round kick your threads !

Asynchronous Tasks : the lifecycle

AsyncTask : real life example

The end ! Q&A !

References AsyncTasksDemo G2Android, the Gallery2 client for Android Painless threading, by Romain Guy Multithreading For Performance, by Gilles Debunne Photos : Slide 5 : Slide 6 : Video : Slide 9 :