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POAsyncTask doInBackground does not run
 

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    <p>I'm having a problem with the AsyncTask class. It seems like my task stops working after creating 4 or 5 tasks. </p> <p>Im having 2 activities. MainActivity which only holds a button that starts a second activity called ImageActivity.</p> <p>ImageActivity is very simple. it got an onCreate that sets the layout, and then it starts a new AsyncTask that loads an image from the internet. This works fine the first few times. But than it suddenly stops working. The onPreExecute method is run every time, but not the doInBackground method. I have tried to simplify the doInBackground with a sleeping loop, and the same thing happens. I cant understand this behavour since the asynctask is both canceled and set to null in the onDestroy method. So every time i start a new ImageActivity, i also create a fresh AsyncTask.</p> <p>I recreate the ImageActivity and the task by hitting the back button, and than clicking the button on the MainActivity.</p> <p>Any ideas anyone? I'm really struggling with this one.</p> <p>UPDATE: Code that starts the ImageActivity (inside a button onClickListener)</p> <pre><code>Intent intent = new Intent(); intent.addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION); intent.setClassName(this, ImageActivity.class.getName()); startActivity(intent); </code></pre> <p>The code above starts this activity</p> <pre><code> public class ImageActivity extends Activity { private AsyncTask&lt;Void, Void, Void&gt; task; public void onCreate(Bundle bundle) { super.onCreate(bundle); setContentView(R.layout.main); task = new AsyncTask&lt;Void, Void, Void&gt;() { @Override protected void onPreExecute() { Log.d(TAG, "onPreExecute()"); } @Override protected Void doInBackground(Void... params) { Log.d(TAG, "doInBackground() -- Here is the download"); // downloadBitmap("http://mydomain.com/image.jpg") return null; } @Override protected void onPostExecute(Void res) { Log.d(TAG, "onPostExecute()"); if(isCancelled()){ return; } } }.execute(); } @Override protected void onDestroy() { super.onDestroy(); task.cancel(true); } } </code></pre> <p>UPDATE:</p> <p>I have tested using a combination of traditional Threads and runOnUiThread method, and it seems to work better. Now the thread runs every time.</p>
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    1. USVidar Vestnes
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    1. COPost your code. How are you calling it. We have no idea how to help you without code
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    2. COHaving exactly the same issue, after starting multiple AsyncTasks in my app, the app only executes up to onPreExecute(), but does not enter doInBackground(). Trying your Thread approach now..
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      1. USMathias Conradt
    3. COI am having the same problem. The weird thing is that it varies from device to device. It occurs on a tablet (Android 4.0), but a phone (Android 2.3.4) running exactly the same code does not have it.
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