Android View Not Attached to Window Manager

View not attached to window manager crash

How to reproduce the bug:

1. Enable this option on your device: Settings -> Developer Options -> Don't keep Activities.
2. 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:

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

Try this fixed code:

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);
        }
    }
}

android View not attached to window manager

I had this issue where on a screen orientation change, the activity finished before the AsyncTask with the progress dialog completed. I seemed to resolve this by setting the dialog to null onPause() and then checking this in the AsyncTask before dismissing.

@Override
public void onPause() {
    super.onPause();

    if ((mDialog != null) && mDialog.isShowing())
        mDialog.dismiss();
    mDialog = null;
}

... in my AsyncTask:

protected void onPreExecute() {
    mDialog = ProgressDialog.show(mContext, "", "Saving changes...",
            true);
}

protected void onPostExecute(Object result) {
   if ((mDialog != null) && mDialog.isShowing()) { 
        mDialog.dismiss();
   }
}

View=DecorView@47b2334[Connecting] not attached to window manager

this error comes when you are trying to attach the progress dialog to an Activity that is already destroyed or in the background. Check if the activity is running by :

activity.isfinishing() if it is false then attach the progressdialog.

@Override
    protected void onPreExecute() {
        progressDialog.setTitle("Connecting");
        progressDialog.setMessage("Trying to connect to your server. Please wait...");
        progressDialog.setCancelable(false);
        progressDialog.setCanceledOnTouchOutside(false);
        if(!context.isFinishing()){
           progressDialog.show();
         }

    }

View not attached to window manager, dialog dismiss

Use a try statement.

new CountDownTimer(700, 100) {
        public void onTick(long millisUntilFinished) {
        }
        public void onFinish() {
           try {
               dialog.dismiss();
               dialog = null;
          } catch (Exception e) {
               //TODO: Fill in exception
          }
        }
    }.start();

View not attached to window manager (whats the solution?)

Dismiss the dialog in your onFinish or onDestroy of the launching activity.

Or/And

Don't let your activity handle the orientation changes.

You might find some help in these answers :
java.lang.IllegalArgumentException: View not attached to window manager

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