android - Receive touch event on any screen -

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i'm trying make custom navigation button , have disabled default navigation buttons provided android rooting device. want custom navigation buttons disappear after interval of time (say 5 seconds). have managed so. want make such whenever touch anywhere on screen, can detect touch event , show navigation bar. whether i'm on homescreen or application, can receive touch event. there way or need go android source code?

thank you

oncreate of service: used windowmanager.layoutparams.flag_watch_outside_touch flag. 

@override     public void oncreate() {         super.oncreate();         toast.maketext(getbasecontext(),"oncreate", toast.length_long).show();         mview = new hudview(this);         windowmanager.layoutparams params = new windowmanager.layoutparams(                 windowmanager.layoutparams.type_system_overlay,                 windowmanager.layoutparams.flag_watch_outside_touch,                 pixelformat.translucent);         params.gravity = gravity.right | gravity.top;         params.settitle("load average");         windowmanager wm = (windowmanager) getsystemservice(window_service);         wm.addview(mview, params);     }

now, start getting each , every click event.

see creating system overlay window (always on top)


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