android - my application not resume when reopen? -

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my application not resuming previous state when reopen although working when call recieved or other application open , closed comes in front

but

when home_key pressed start first activity.

it not happened on emulator happens on device

it happens activity among many activities in app

do reimplement onresume() method in activity?

i'm not sure state need restore, perhaps saving android activity state using save instance state might (duplicate?)?

you familiar activity lifecycle?


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