Android App 可能占据整个屏幕

Question

I am in middle of app development and what I want it that when user powers up his/her phone and the home screen loads, can there be a broadcast (from system) which could fire an app to launch and take up the whole screen?

Is is possible to do this?

Further, can this also be done via some background service, when the app wants, it should display and take full screen of user. Can this be done also?

What would I need to do for this?

Answer 1

Up until Android 10, you could register a broadcast for android.intent.action.BOOT_COMPLETED , and then you could start an Activity from there.

Starting from Andoid 10, there are some restrictions on opening activities from background. Check the documentation , there are a few exception that might possibly apply to you ( such as having SYSTEM_ALERT_WINDOW ).

Note that this kind of behaviour is frowned upon, as it's very intrusive ( some app randomly opening by itself feels like adware app ), so I'd suggest you don't go down this route.