取消Android asyncTask进度对话框

Question

I have an android application that employs AsyncTasks with progress dialogs.
My problem is that although i have managed to cancel the AsynchTasks i get

Activity ... has leaked window 

Its because even though i have managed to cancel the asynchTask i havent cancelled the progress dialog.
how can i guarantee to cancel the asynctasks progress dialog?

@SuppressWarnings("rawtypes")
public OnCancelListener buildOnCancelListener(final AsyncTask asyncTask) {
return new DialogInterface.OnCancelListener() {
@Override
public void onCancel(final DialogInterface dialogInterface) {
    asyncTask.cancel(true);
    }
};
}

Answer 1

Put yourDialog.dismiss(); in the onCancelled method and in onPostExecute . If you are using AsyncTask.cancel(...) the onCancelled() will be invoked after doInBackground() NOT onPostExecute().

This is documented here .

Answer 2

This is because you're trying to move to a new Activity without dismissing the Dialog first.

You can try this:

• use publishProgress() and onProgressUpdate() in AsyncTask to update the ProgressDialog .
• in onProgressUpdate() tests for the dialog to be visible/alive before trying to update it. This will not bring any synchronization issue since onProgressUpdate run in the same UI Thread of the activity.
• call dialog.dismiss() both on onCanceled() and onPostExecute() .
• be sure to call dialog.dismiss() in Activity.onStop() if your dialog is already visible.

Calling dialog.dismiss() in onCancel() will not guarantee that the problem is solved since