View not attached to window manager crash 的解决办法

转自：http://stackoverflow.com/questions/22924825/view-not-attached-to-window-manager-crash

+50

How to reproduce the bug:

Enable this option on your device: Settings -> Developer Options -> Don't keep Activities.
Press Home button while the AsyncTask is executing and the ProgressDialog is showing.

The Android OS will destroy an activity as soon as it is hidden. When onPostExecute is called the Activity will be in "finishing" state and the ProgressDialog will be not attached to Activity.

How to fix it:

Check for the activity state in your onPostExecute method.
Dismiss the ProgressDialog in onDestroy method. Otherwise, android.view.WindowLeakedexception will be thrown. This exception usually comes from dialogs that are still active when the activity is finishing.

public class YourActivity extends Activity {

    <...>

    private void showProgressDialog() {
        if (pDialog == null) {
            pDialog = new ProgressDialog(StartActivity.this);
            pDialog.setMessage("Loading. Please wait...");
            pDialog.setIndeterminate(false);
            pDialog.setCancelable(false);
        }
        pDialog.show();
    }

    private void dismissProgressDialog() {
        if (pDialog != null && pDialog.isShowing()) {
            pDialog.dismiss();
        }
    }

    @Override
    protected void onDestroy() {
        dismissProgressDialog();
        super.onDestroy();
    }

    class LoadAllProducts extends AsyncTask<String, String, String> {

        /**
         * Before starting background thread Show Progress Dialog
         * */
        @Override
        protected void onPreExecute() {
            showProgressDialog();
        }

        /**
         * getting All products from url
         * */
        protected String doInBackground(String... args)
        {
            doMoreStuff("internet");
            return null;
        }


        /**
         * After completing background task Dismiss the progress dialog
         * **/
        protected void onPostExecute(String file_url)
        {
            if (YourActivity.this.isDestroyed()) { // or call isFinishing() if min sdk version < 17
                return;
            }
            dismissProgressDialog();
            something(note);
        }
    }
}