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POCannot cancel running AsyncTask in AsyncTaskLoader
 

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  1. POCannot cancel running AsyncTask in AsyncTaskLoader
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    <p>I want to cancel running AsyncTask (in AsyncTaskLoader) when the user clicks the home button. Here is what I created so far:</p> <pre><code>package cz.davidliska.android.loaders; import java.text.SimpleDateFormat; import java.util.Date; import android.content.Context; import android.os.Bundle; import android.support.v4.app.FragmentActivity; import android.support.v4.app.LoaderManager; import android.support.v4.content.AsyncTaskLoader; import android.support.v4.content.Loader; import android.util.Log; public class MainActivity extends FragmentActivity implements LoaderManager.LoaderCallbacks&lt;Date&gt; { private static final String TAG = "loader"; private Date date; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); LoaderManager.enableDebugLogging(true); getSupportLoaderManager().initLoader(0, savedInstanceState, this); } private static class DateLoader extends AsyncTaskLoader&lt;Date&gt; { public static final String STATE_DATE_LOADER = "dateloader.state"; private Date mDate; public DateLoader(Context context, Bundle savedInstanceState) { super(context); if (savedInstanceState != null) { long timeStamp = savedInstanceState.getLong(STATE_DATE_LOADER); if (timeStamp != 0L) mDate = new Date(timeStamp); } } @Override protected void onStartLoading() { Log.d(TAG, "Loader.onStartLoading()"); if (mDate != null) { deliverResult(mDate); } else { forceLoad(); } } @Override public void deliverResult(Date data) { super.deliverResult(data); Log.d(TAG, "Loader.deliverResult()"); mDate = data; } @Override protected void onStopLoading() { super.onStopLoading(); cancelLoad(); // try to cancel AsyncTask Log.d(TAG, "Loader.onStopLoading()"); } @Override protected void onForceLoad() { // overridden in AsyncTaskLoader super.onForceLoad(); Log.d(TAG, "Loader.onForceLoad()"); } @Override protected void onReset() { super.onReset(); mDate = null; Log.d(TAG, "Loader.onForceLoad()"); } @Override public void onContentChanged() { super.onContentChanged(); Log.d(TAG, "Loader.onContentChanged()"); } @Override protected void onAbandon() { super.onAbandon(); Log.d(TAG, "Loader.onContentChanged()"); } @Override public Date loadInBackground() { // AsyncTaskLoader only Log.d(TAG, "Loader.loadInBackground()"); try { // there will be some HttpClient.execute() while(true) { Thread.sleep(100); Log.d(TAG, "Loader.loadInBackground() still running"); } } catch (InterruptedException e) { Log.d(TAG, "Loader.loadInBackground() interupted"); } Log.d(TAG, "Loader.loadInBackground() finished"); return new Date(); } @Override public void onCanceled(Date data) { // AsyncTaskLoader only super.onCanceled(data); Log.d(TAG, "Loader.onCanceled()"); } @Override protected Date onLoadInBackground() { // AsyncTaskLoader only Log.d(TAG, "Loader.onContentChanged()"); return super.onLoadInBackground(); } @Override public void abandon() { Log.d(TAG, "Loader.abandon()"); super.abandon(); } @Override public boolean cancelLoad() { Log.d(TAG, "Loader.cancelLoad()"); return super.cancelLoad(); } @Override public void forceLoad() { Log.d(TAG, "Loader.forceLoad()"); super.forceLoad(); } @Override public boolean isAbandoned() { Log.d(TAG, "Loader.isAbandoned()"); return super.isAbandoned(); } @Override public boolean isReset() { Log.d(TAG, "Loader.isReset()"); return super.isReset(); } @Override public boolean isStarted() { Log.d(TAG, "Loader.isStarted()"); return super.isStarted(); } @Override public void reset() { Log.d(TAG, "Loader.reset()"); super.reset(); } @Override public void stopLoading() { Log.d(TAG, "Loader.stopLoading()"); super.stopLoading(); } @Override public boolean takeContentChanged() { Log.d(TAG, "Loader.takeContentChanged()"); return super.takeContentChanged(); } } @Override protected void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); if (date != null) outState.putLong(DateLoader.STATE_DATE_LOADER, date.getTime()); } public Loader&lt;Date&gt; onCreateLoader(int id, Bundle args) { Log.d(TAG, "LoaderCallback.onCreateLoader()"); if (args != null) Log.d(TAG, "bundle: " + args.getLong(DateLoader.STATE_DATE_LOADER)); return new DateLoader(this, args); } public void onLoadFinished(Loader&lt;Date&gt; loader, Date data) { Log.d(TAG, "LoaderCallback.onLoadFinished(): " + new SimpleDateFormat("dd/MM/yyyy").format(data)); date = data; } public void onLoaderReset(Loader&lt;Date&gt; loader) { Log.d(TAG, "LoaderCallback.onLoaderReset()"); } } </code></pre> <p>So in onStopLoading() i am calling cancelLoad(), which i think should cancel current task, but AsyncTask in AsyncTaskLoader is still running (while loop in loadInBackground() is still in progress).</p> <p>The problem is maybe in cancelLoad() method in "java.android.support.v4.content.AsyncTaskLoader.java", where mTask.cancel(boolean) is called with "false" in arguments:</p> <pre><code>public boolean cancelLoad() { ... boolean cancelled = mTask.cancel(false); </code></pre> <p>Is there any chance to cancel running AsyncTask in AsyncTaskLoader?</p>
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