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POCalling Async Task
 

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    <p>I am streaming a radio Stream. I want to generate a notification when the song in the stream changes. I am using streamscraper (http://code.google.com/p/streamscraper) to get the metadata of the current stream, and I try to generate a notification when the metadata changes. </p> <p>Here is the Async Task that I created to implement this. </p> <pre><code>public class updateMetadata extends AsyncTask&lt;String, Void, PlaylistSong&lt;BaseArtist, BaseAlbum&gt;&gt; { private static final String TAG = updateMetadata.class.getSimpleName(); private PlaylistSong&lt;BaseArtist, BaseAlbum&gt; oldSong = null; private PlaylistSong&lt;BaseArtist, BaseAlbum&gt; newSong = null; private metadataHarvester fetchMetadata = new metadataHarvester(); private String streamUrl = null; @Override protected PlaylistSong&lt;BaseArtist, BaseAlbum&gt; doInBackground(String... urls) { for (String url : urls) { try { oldSong = fetchMetadata.prepareRadioSong(url); } catch (Exception e) { e.printStackTrace(); } streamUrl = url; } newSong = oldSong; while (newSong == oldSong) { try { newSong = fetchMetadata.prepareRadioSong(streamUrl); } catch (Exception e) { e.printStackTrace(); } } return newSong; } @Override protected void onPostExecute(PlaylistSong&lt;BaseArtist, BaseAlbum&gt; song) { Log.v(TAG, "New Song: " + song.getTitle()); } } </code></pre> <p>The application is built on two linked projects. Project A is where the Application is initialised and Project B contains the collections and the playing logic. I want to use this task in Project B. Here is the play function (in project B).</p> <pre><code>protected synchronized void play(final IMediaPlayerWrapper mp) { streamURL = streamFetcher.getStreamUrl(); Log.i(TAG, "Stream URL: " + streamURL); try { Log.i(TAG, "Testing metadata harvester"); radioSong = metadata.prepareRadioSong(streamURL); } catch (Exception e) { Log.w(TAG, e); } updateMetadata(radioSong); currentPlaylistManager.clearPlaylist(); currentPlaylistManager.appendSongAtEnd(radioSong); listenerInformer.informCurrentSongChangeListener(radioSong); try { mp.setSong(radioSong, streamURL); mp.play(); if (mp.isPlaying()) { setPlayerState(PlayerState.PLAY); } } catch (Exception e) { Log.w(TAG, e); setPlayerState(PlayerState.ERROR); } updateMetadata metadataChecker = new updateMetadata(); metadataChecker.execute(streamURL); } </code></pre> <p>When I try to execute it, the application crashes. </p> <p>Here, is the complete error trace:</p> <pre><code>04-04 23:34:34.975: E/WindowManager(18080): Activity ch.ethz.dcg.pancho2.view.radioplayer.RadioPlayerActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@4053e8f0 that was originally added here 04-04 23:34:34.975: E/WindowManager(18080): android.view.WindowLeaked: Activity ch.ethz.dcg.pancho2.view.radioplayer.RadioPlayerActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@4053e8f0 that was originally added here 04-04 23:34:34.975: E/WindowManager(18080): at android.view.ViewRoot.&lt;init&gt;(ViewRoot.java:258) 04-04 23:34:34.975: E/WindowManager(18080): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:148) 04-04 23:34:34.975: E/WindowManager(18080): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91) 04-04 23:34:34.975: E/WindowManager(18080): at android.view.Window$LocalWindowManager.addView(Window.java:424) 04-04 23:34:34.975: E/WindowManager(18080): at android.app.Dialog.show(Dialog.java:241) 04-04 23:34:34.975: E/WindowManager(18080): at android.app.ProgressDialog.show(ProgressDialog.java:107) 04-04 23:34:34.975: E/WindowManager(18080): at android.app.ProgressDialog.show(ProgressDialog.java:90) 04-04 23:34:34.975: E/WindowManager(18080): at ch.ethz.dcg.pancho2.view.radioplayer.RadioPlayerActivity$5.onClick(RadioPlayerActivity.java:276) 04-04 23:34:34.975: E/WindowManager(18080): at android.view.View.performClick(View.java:2485) 04-04 23:34:34.975: E/WindowManager(18080): at android.view.View$PerformClick.run(View.java:9080) 04-04 23:34:34.975: E/WindowManager(18080): at android.os.Handler.handleCallback(Handler.java:587) 04-04 23:34:34.975: E/WindowManager(18080): at android.os.Handler.dispatchMessage(Handler.java:92) 04-04 23:34:34.975: E/WindowManager(18080): at android.os.Looper.loop(Looper.java:130) 04-04 23:34:34.975: E/WindowManager(18080): at android.app.ActivityThread.main(ActivityThread.java:3683) 04-04 23:34:34.975: E/WindowManager(18080): at java.lang.reflect.Method.invokeNative(Native Method) 04-04 23:34:34.975: E/WindowManager(18080): at java.lang.reflect.Method.invoke(Method.java:507) 04-04 23:34:34.975: E/WindowManager(18080): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 04-04 23:34:34.975: E/WindowManager(18080): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 04-04 23:34:34.975: E/WindowManager(18080): at dalvik.system.NativeStart.main(Native Method) </code></pre> <p>I am confused in my understanding of Async Tasks. Is this not the correct way to use them?</p> <p>EDIT: Answer added separately. </p>
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    1. COBasically you're trying to show dialog after you're exit activity. There are various reasons for the above to happen, but I don't see anything about dialog in your code. Do you use dialog?
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    2. CONo, I am trying to Log the new song after the current song has changed. No dialog or anything at this stage. I already have a onSongChanged listener set up. I can just call that when I am sure the checking for new songs bit is working.
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    3. COr u trying to show any dialog or progress dialog in your RadioPlayerActivity onclick method?
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