Android: displaying icons on device's desktop -

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i know how facebook messenger work. mean, guess there service running in background, broadcast receiver. baffles me when receive message, circle person's profile picture pops on home screen.

https://encrypted-tbn1.gstatic.com/images?q=tbn:and9gcq7ik8vphoc1ork3vf-ltozptsptdtgzzgecofsk49hxyikdmv4

how can achieve that? displaying icons desktop. (no, not want set shortcuts).

i have not used facebook app, might misunderstand want do, might achieavable widget?
if want more 'dynamic' experience, without needing user place widget, can use intent or broadcast launch transparent activity (here question on transparent activties). activity can display views want show on top on whatever user viewing (such home screen).


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