How to make android app to first thing to be launched after Unlocking phone

I need urgent help to make a android app to be launched after unlocking the phone.

I want always on top kind of functionality in App, Means whenever phone unlocked by the user , they should see the app.

is it Possi开发者_StackOverflow社区ble??

Thank in Advance

Not really. You could approximate it by having your app replace the home screen/launcher, but the user will still be able to revert to the original one through the settings menu.

Yes. This thread discusses that there is an Intent Object that you can capture using a BroadcastReceiver. The BroadcastReceiver can then run the code you need or launch an Activity, etc.