Why is my android activity being stopped? -

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i have inherited code application need modify (yuck). activity in question implements surfaceholder.callback , sensoreventlistener. activity custom camera.

the code works fine autofocus, , take picture. once picture taken, start activity result crop image. activity started, surfaceholder.callback surfacedestroyed called (as expected). @ point existing application releases camera (as expected). however, when new crop activity launched, original camera activity stopped (stack trace: instrumentation.callactivityonstop->activity.performstop).

edit: complete stack trace when onstop of activity called:

cameraactivity.onstop() line: 784       instrumentation.callactivityonstop(activity) line: 1219 cameraactivity(activity).performstop() line: 5186       activitythread.performstopactivityinner(activitythread$activityclientrecord, activitythread$stopinfo, boolean, boolean) line: 3003      activitythread.handlestopactivity(ibinder, boolean, int) line: 3052     activitythread.access$1000(activitythread, ibinder, boolean, int) line: 139     activitythread$h.handlemessage(message) line: 1251      activitythread$h(handler).dispatchmessage(message) line: 99     looper.loop() line: 137 activitythread.main(string[]) line: 4918        method.invokenative(object, object[], class, class[], class, int, boolean) line: not available [native method]  method.invoke(object, object...) line: 511      zygoteinit$methodandargscaller.run() line: 1004 zygoteinit.main(string[]) line: 771     nativestart.main(string[]) line: not available [native method]

because of camera activity no longer active, , doesn't receive result crop activity.

why destroying surface/releasing camera cause camera activity stop? must missing here...

make sure request code passed startactivityforresult positive or activity not result. weird part of api has bitten me before:

to quote docs: https://developer.android.com/reference/android/app/activity.html#startactivityforresult

requestcode if >= 0, code returned in onactivityresult() when activity exits.

in general, onstop can called time activity not foreground activity. not prevent receiving activity results. activity can restarted in order receive result.

http://developer.android.com/guide/components/activities.html

also, pay attention task affinity , stack , make sure crop activity running part of same task keep activity being stopped, again no assurances.

http://developer.android.com/guide/components/tasks-and-back-stack.html


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