CODEWITHSUNDEEP
javaandroidmultithreadingandroid-asynctaskrunnable
user3119384
user3119384

Reputation: 339

Android - Runnable run() function is not working

I am working on an android application extending activity and implementing Runnable.

The problem is that the run() function is not launched and I'm not sure if implementing Runnable make it launch automaticly as AsyncTask?

Here is my code

 public class MainActivity extends FragmentActivity implements
        ActionBar.TabListener, Runnable {

        ...

        @Override
        public void run() {
         // mediaPlayer is myMediaPlayer
         // progress is my SeekBar
        Log.w("Tunesto", "testabababab");
         int currentPosition = 0;
         int total = mediaPlayer.getDuration();
         progress.setMax(total);
         while (mediaPlayer != null && currentPosition < total) {
             try {
                 Thread.sleep(1000);
                 currentPosition = mediaPlayer.getCurrentPosition();
             } catch (InterruptedException e) {
                 return;
             } catch (Exception e) {
                 return;
             }
             progress.setProgress(currentPosition);
             Log.w("MyApp", String.valueOf(currentPosition));
         }
        }
 }

Obviously if I launch Run fro, the UI Thread it will freeze the screen because of the sleep method, so how should I do to let the Run method to run?

Thank you!

Upvotes: 1

Views: 3352

Answers (2)

Narendra Pathai
Narendra Pathai

Reputation: 41945

You will have to use AsyncTask in Android.

Steps to perform:

  • Create a nested class which extends AsyncTask
  • Implement the doInBackground method, where your logic should reside
  • Call the execute method on your nested class instance from where you need to call run()

The fact is i'm not sure if it's possible to stop an asyntask?

You can cancel the async task using the cancel() method on the AsyncTask. Refer to Android Documentation for more details on this.

Edit

To move your code inside the run() function to an AsyncTask, you will put anything that is "setting up" UI stuff inside onPreExecute() such as creating a ProgressBar. Then put your work in such as calling sleep() and other things that can't be done on the UI Thread inside doInBackground(). If you need to update your seek bar you can do that in onProgressUpdate() by calling publishProgress() inside doInBackground(). Finally, if you need to dismiss the ProgressBar or do some ending UI stuff you will do that in onPostExecute().

The reason for that explanation is because all methods of AsyncTask run on the UI Thread except for doInBackground().

AsyncTask Docs

Vogella: Background tasks in Android

Upvotes: 3

David O&#39;Meara
David O&#39;Meara

Reputation: 3033

new Thread(this).start();

Although an anonymous inner class on either the handler or async would be better than making the activity itself Runnable.

Upvotes: 0

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