How to fullscreen app after system boot

Hi,

 

I written a application that auto launch after system boot and with full screen window style, it is work fine after system boot and I manually unlock screen instantly, but if I do not unlock screen instantly, for example, wait for 10 seconds, the system status bar will overlay on my application. I think maybe system status bar launched before my app, so I set SystemClock.sleep(5000) after my app received system broadcast:BOOT_COMPLETED, but this is not useful.

 

Thank you,

Max