Android: Turn screen ON and notify user

I have some Intent. When intent fires, I want to se开发者_如何学Cnd a popup notification like an AlertBox and turn screen ON to let User see the notification immediately (I mean without showing a lockscreen).

If you've used, for example, HandcentSMS then you understand what I mean (like a popup notification when accept a message)

How to organize this? Any code examples? What kind of permissions I have to use?

Thank you in advance.

Check out PowerManager.

PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
PowerManager.WakeLock wl = pm.newWakeLock(PowerManager.SCREEN_DIM_WAKE_LOCK, "My Tag");
wl.acquire();
//Do whatever you need right here
wl.release(); 

Your activity should have the following code in onCreate() implementation:

@Override
   public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);

      getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON|
               WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD|
               WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED|
               WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON);

      setContentView( R.layout.myLayout);

      // rest of initialization
}

You invoke the activity using an intent. Here is an example:

Intent startIntent = new Intent(context, MyActivity.class);

startIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

context.startActivity(startIntent);

Perhaps KeyguardLock will do what you want: popup your notification and then call disableKeyguard, then re-enable when the user is done or after you time out.

Security-wise it is a little risky, but there you go.