Keep screen alive and app in front of lockscreen

Question

when i start a google maps navigation it keeps the screen alive and if i turn it off and on again with the power button, the maps app is above the lockscreen and only when i minimize the app, i have to unlock the screen. So i can turn the screen off and on and still use the app without having to unlock the screen

How can i achieve that for my own app?

I know i cann keep the screen on with

getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);

but that doesn't prevent me from having to unlock the screen after turning it off and on again.

Answer 1

You can use something like the screen pinning option . The application will be over the lock screen but it's not done programmatically, however it does the effect you want.

Instructions to pin an app on the screen:

• Go to Settings →Security→Screen pinning
• Enable screen pinning and also the option "Ask for unlock pattern before unpinning"
• Now open the app you want, then switch over to the overview menu
• Tap on the pin icon on the app.

However, if you want to do it with code, see the attribute : android:showOnLockScreen="true" and the link :

• Android activity over default lock screen
• Starting activity from service on lock screen turns on the screen but does not show the activity itself
• FLAG SHOW WHEN LOCKED

Answer 2

您应该将getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON) setContentView() getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON)下面，并将android:keepScreenOn="true"放入主布局的根视图中。

Answer 3

ok, thanks to the answer given by Arnauld Alex, i got it. Just add

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

before the setContentView(...)