how to unlock the screen when BroadcastReceiver is called?

As you can guess, i register an alarm by AlarmMana开发者_C百科ger. And the BroadcastReceiver will be called correctly. But when it called, my phone screen is still locked. I notice the default AlarmClock application is not like this. So my question is, how to unlock the screen when the BroadcastReceiver is called ? (Unlock the screen can make the user to operate my Activity directly) Thanks in advance.

The source code for the alarm clock is in the Android source code. AlarmClock is gone, but has been replaced by DeskClock. Source code is here. I glanced over the code real quick, and their receiver seems to use the KeyguardManager. Check out the docs, that seems to be what you want.

EDIT: I'll add your findings here. This code should do:

final Window win = getWindow();
win.addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED
              | WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD); 
win.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON
              | WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON);

Open the Activity A which you want to start from onReceive(....). Paste this in onCreate() of that Activity A

     final Window win= getWindow();
    win.addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED | 
              WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD);
    win.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON |
               WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON);

Make sure you are not pasting it before setContentView(....) :)