Need to show a dialog on top of all other Apps for a custom hardware on Android

Question

I need to show a dialog (more like a horizontal bar) on press of a custom Key (on my custom device powered by Android). This dialog should appear on top of any other application(say "A") that might be running when the Key is pressed.
The app "A" should keep on running and its UI should be visible (i.e the app "A: should not go to "_onPause_()"). It should work something similar to_ SystemUI_'s volume change dialog when Volume Hard Keys are pressed. I want to make minimum changes in framework.
My understanding is that I need to make changes in _PhoneWindowManager.java_ to handle the press of custom Key, which will then call my app residing in application layer, which will just inflate the dialog.
Would this work? If so, is there a better way to implement it? If not, how can I implement this?

Comments

Quick question: why not just show it in the notification bar?  Thats what it was made for..

Answer 1

U need a service that listen to keystrokes and show a toast, or u can use DialogInterface.

Answer 2

use

intent.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);