KeyguardManager FLAG_DISMISS_KEYGUARD for Service

Question

When the screen is turned on, I want to check is power button activated it, if yes, it will auto dismiss the keyguard and run the toast.

When the screen is turned o

Answer 1

Okay so this is not as simple as it would seem Services cannot actually own the currently running activity but you need an activity to get a reference to the window

So you could do that bit a couple of different ways.

Turning off the screen from a service
In the answer given in this question a dummy activity is created (one that is not inflated) and used to get the window (works but not sure what if the uninflated activity causes a leak or other issues. Plus it seems kinda like a dirty hack)

Or.....

The CommonWares way

how can i get the current foreground activity from a service
You could handle the actual window manipulation in a callback fired when your service broadcasts an intent to the activity that will be doing this. (Better design but a bit more archetectural reworking) Example

Once you decide how you want to do (I would recommend #2) The following should work but, note I have not tested it.

//Get the window from the context
WindowManager wm = Context.getSystemService(Context.WINDOW_SERVICE);

//Unlock
//http://developer.android.com/reference/android/app/Activity.html#getWindow()
Window window = getWindow();  
window.addFlags(wm.LayoutParams.FLAG_DISMISS_KEYGUARD);  

//Lock device
DevicePolicyManager mDPM;
mDPM = (DevicePolicyManager)getSystemService(Context.DEVICE_POLICY_SERVICE);