How to determine the lock screen is on the top of the other activity, or the other activity is on the top of the lock screen?

Question

I encountered a problem,

• MyActivity is under the LockScreen, in this case, I need to launch MyActivity from framework by clicking volume button;
• MyActivity is on the top of Lockscreen, in this case, I do nothing.

But I don't know how to distinguish this two situations in framework. I know how to get the top activity, however, LockScreen isn't a activity.

I have a temporary solution, if MyActivity has LayoutParams.FLAG_SHOW_WHEN_LOCKED property, set a custom system property, so I know whether launch MyActivity by this custom system property, but I don't think this is good.

I want to know whether there is a better solution.

Answer 1

Register BroadcastReceiver "android.intent.action.USER_PRESENT" in CameraActivity and detect whenever screen unlock event happens. Than Based on your requirement you can manage your code.

USER_PRESENT Receiver

in your MainActivity inside oncreate you can check whether screen is locked or not

KeyguardManager keyguardManager = (KeyguardManager) 
context.getSystemService(Context.KEYGUARD_SERVICE);
if( keyguardManager .inKeyguardRestrictedInputMode()) {
 //it is locked
} else {
 //it is not locked
}