Android activity over default lock screen

Question

How can I display an Activity or Dialog to be visible over the lock screen?

I have already tried displaying my lock activity when screen turns on by setting various window type in Activity.onCreate() method:

TYPE_PRIORITY_PHONE
TYPE_SYSTEM_ALERT
TYPE_KEYGUARD

and others together with SYSTEM_ALERT_WINDOW and INTERNAL_SYSTEM_WINDOW permissions.

My activity is visible after I unlock the device.

UPDATE:

I actually already managed to display my own Activity instead of default lock screen. It work perfectly unless you use HOME button.

Answer 1

getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON|             WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD|             WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED|             WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON); 

try using this flags to disable lock screen when the activity is started.

After API level 17 you can use

<activity         android:name=".yourActivityName"         android:showOnLockScreen="true"         android:screenOrientation="sensorPortrait" > 

showOnLockScreen like in the example...

Answer 2

Don't go for activity, because android will not show lock screen behind your activity for security reason, so use service instead of Activity.

Below is my code in onStartCommand of my service.

WindowManager mWindowManager = (WindowManager) getSystemService(WINDOW_SERVICE);  View mView = mInflater.inflate(R.layout.score, null);  WindowManager.LayoutParams mLayoutParams = new WindowManager.LayoutParams( ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT, 0, 0, WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY, WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED     | WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD     | WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON /* | WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON */, PixelFormat.RGBA_8888);  mWindowManager.addView(mView, mLayoutParams); 

And add <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" /> to manifest