Avoid locking the screen while ProgressDialog is displaying

Question

I want to show a progressBar while some instructions execute in background, but I don't want to lock the screen. This code is locking the screen:

private class ConvertDataInBackground extends AsyncTask<Params, Void, Boolean> {

        private MyProgressDialog mProgressDialog;

        @Override
        public void onPreExecute() {
            if(mProgressDialog == null)
                mProgressDialog = MyProgressDialog.show(mActivity, null, null);
        }

        @Override
        protected Boolean doInBackground(Params...params) {
            boolean conversionResult = executeConversion(params[0].item1, params[0].item2, params[0].item3);
            return conversionResult;
        }

        @Override
        protected void onPostExecute(Boolean result) {
            try {
                if(mProgressDialog.isShowing()) 
                    mProgressDialog.dismiss();
                if(result) {
                    Toast toast = Toast.makeText(mActivity, R.string.conversion_result, Toast.LENGTH_SHORT);
                    toast.setGravity(Gravity.CENTER, 0, 0);
                    toast.show();
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
}

Execution of instruction in background may take a while, and I want the user to be able to work with the interface. Do you know anyway that we can work with interface, while progressDialog is displaying at the top?

Dialogs in Android are usually modal. You can try creating the dialog then adding `FLAG_NOT_TOUCH_MODAL` to its window parameters - but I'm not sure if it will work. — Aleks G, Aug 08 '13 at 11:03
Take a look at the `PowerManager` API and the `WakeLock` method. There's various flags you can call to prevent dimming, locking and sleeping. https://developer.android.com/reference/android/os/PowerManager.html#SCREEN_DIM_WAKE_LOCK — Joshua Pinter, May 13 '17 at 22:37

score 4 · Accepted Answer · answered Aug 08 '13 at 13:32

Dialogs in Android are usually modal. You can try creating the dialog then adding FLAG_NOT_TOUCH_MODAL to its window parameters - but I'm not sure if it will work. The idea behind it will be something like this:

ProgressDialog dialog = new ProgressDialog(this);
dialog.setMessage(...);
dialog.setTitle(...);
dialog.getWindow().addFlags(WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL);

Note at the same time that it may be easier to just add a ProgressBar to your activity's layout and show it when needed instead of creating a dialog - this is, in fact, what Google documentation recommends. Android developer's guide on dialogs has this to say:

Avoid ProgressDialog

Android includes another dialog class called ProgressDialog that shows a dialog with a progress bar. However, if you need to indicate loading or indeterminate progress, you should instead follow the design guidelines for Progress & Activity and use a ProgressBar in your layout.

score 2 · Answer 2 · answered Aug 08 '13 at 11:00

2

I think that in your activity you must specify the FLAG_KEEP_SCREEN_ON flag:

    getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);

For me it worked.

answered Aug 08 '13 at 11:00

Ivan

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Avoid locking the screen while ProgressDialog is displaying

2 Answers2