Are there known issues with Android Services on 4.1.x (Jelly Bean)? -

-

my question shot in dark: deal android 4.x / jelly bean? there known problems services, stickiness, foreground, etc.?

backstory: tested music player application on sorts of android devices , emulators , on physical jelly bean device (samsung rugby pro). found mediaplayer oncompletion function not being fired consistently when screen turned off. isn't fired several minutes. when screen on, whether or not activity shown, application works fine.

(there no problems on gingerbread, kitkat, lollipop, or marshmallow. have physical devices versions , work flawlessly.)

device information:

  • os version: 3.0.31-656355
  • release: 4.1.1
  • device: comancheatt
  • model: samsung-sgh-i547
  • product: comancheuc
  • brand: samsung
  • display: jro03l.i547ucbll1
  • cpu_abi: armeabi-v7a
  • cpu_abi2: armeabi
  • hardware: qcom
  • id: jro03l
  • manufacturer: samsung
  • user: se.infra
  • host: sep-125

i figured out; hope helps ...

the problem not in firing oncompletion event rather reset() blocks indefinitely. had attributed android issue #959: mediaplayer "crash" (deadlocks calling thread) when resetting or releasing unused mediaplayer incorrect case.

my particular problem aggressive sleep behavior on test device. bug pop when ran in airplane mode few other apps because call reset() (or release()) releases mediaplayer instance's wakelock. once occurred device sleep , code appear block in function. unable reproduce debugger attached and/or plugged in because either of prevented device sleeping!

my solution create separately managed wakelock acquire() when playback begins , release() after songs have played through. technically, when activity has been paused , release on resume because it's unnecessary hold wakelock when device awake already.

powermanager powermanager = (powermanager) getsystemservice(power_service); wakelock wakelock = powermanager.newwakelock(powermanager.partial_wake_lock, "mytag"); wakelock.acquire();

Comments

Post a Comment

Popular posts from this blog

ios - Memory not freeing up after popping viewcontroller using ARC -

-
hi project arc based, using uinavigationcontroller make transition between viewcontroller. using profiler analyse happening behind scene memory. noticed when push viewcontroller allocate memory components , when pop not freeing allocated memory. since using arc unable implement dealloc or release component. have analysed in detail , there no memory leak in project. i not using strong property push viewcontroller. here how pushing viewcontroller. viewcontroller *obj = [[viewcontroller alloc] init]; [self.navigationcontroller pushviewcontroller:obj animated:no]; any clue whats going on? should free memory have consumed. please advise your description indicates have retain cycle, leads objects not being deallocated. typical source of retain cycles properties assigned loading nib files (usually declared iboutlet ). two strategies break them , release objects: declare property weak : @property (nonatomic, weak) iboutlet uilabel *statuslabel; set property nil in...
Read more

Django REST Framework perform_create: You cannot call `.save()` after accessing `serializer.data` -

-
i have following viewset: class artistprofileviewset(viewsets.modelviewset): queryset = artistprofile.objects.all() serializer_class = artistprofileserializer def perform_create(self, serializer): if serializer.is_valid(): serializer.save() with following serializers: class simpleartisttrackserializer(serializers.hyperlinkedmodelserializer): class meta: model = artisttrack fields = (...my fields...) class artistprofileserializer(serializers.hyperlinkedmodelserializer): owners = userserializer(many=true, required=false) tracks = simpleartisttrackserializer(many=true, required=false) class meta: model = artistprofile fields = (...my fields...) i getting following error: assertionerror: cannot call `.save()` after accessing `serializer.data`.if need access data before committing database inspect 'serializer.validated_data' instead. i don't see editing serializer.data object. th...
Read more

Why does Go error when trying to marshal this JSON? -

-
i'm trying rather simple example of trying decode json file structs using golang. however, when attempting error that json: cannot unmarshal object go value of type []main.track which don't understand. here's code in question, , json can found here . package main import ( "encoding/json" "fmt" "net/http" "os" ) // tracks group of track types type tracks struct { tracks []track } // track represents singular track type track struct { name string url string artist artist } // artist represents single artist type artist struct { name string mbid string url string } func main() { url := "http://ws.audioscrobbler.com/2.0/?method=geo.gettoptracks&api_key=c1572082105bd40d247836b5c1819623&format=json&country=netherlands" response, err := http.get(url) if err != nil { fmt.printf("%s\n", err) os.exit(1) } de...
Read more