Can I get information when locked in a Android App

I开发者_开发百科 developed a android appli. It's a widget. and I wanna get information whether the display locked or not. How can I do?

KeyguardManager keyguardManager = (KeyguardManager) getSystemService(KEYGUARD_SERVICE);

boolean isDisplayLocked = keyguardManager.inKeyguardRestrictedInputMode();

if (isDisplayLocked) {

  //your code

}