Memory Leaks at SerialBinder

[talhacomak]

I am getting memory leak error at SerialBinder instance in Serial Service. I converted TerminalFragment into an Activity and i inserted bindService function to onCreate() and unbindService function to end of the onDestroy() methods. Where could the problem be and any suggestion for solutions? Thanks for advance.

[kai-morich]

i also use startService and stopService and keep a reference to the service in onServiceConnected. The fragment uses setRetainInstance() to only get a single instance created and the service reference is still valid after rotation. you should check if service reference is still valid after rotating your Android device

[talhacomak]

The memory leak is occuring after onDestroy method of the Activity. The Leak Canary Logs:

┬───
│ GC Root: Global variable in native code
│
├─ mpackage.bluetooth.SerialService$SerialBinder instance
│    Leaking: UNKNOWN
│    Retaining 28 B in 1 objects
│    this$0 instance of mpackage.SerialService
│    ↓ SerialService$SerialBinder.this$0
│                                 ~~~~~~
╰→ mpackage.SerialService instance
​     Leaking: YES (ObjectWatcher was watching this because mpackage.bluetooth.SerialService received Service#onDestroy()
​     callback and Service not held by ActivityThread)
​     Retaining 693 B in 11 objects
​     key = 5980adb2-c359-4363-9726-13d02d33777b
​     watchDurationMillis = 6755
​     retainedDurationMillis = 1752
​     mApplication instance of mpackage.BaseApp
​     mBase instance of android.app.ContextImpl

METADATA

Build.VERSION.SDK_INT: 27
Build.MANUFACTURER: AGM
LeakCanary version: 2.9.1
App process name: mpackage
Class count: 6755
Instance count: 115426
Primitive array count: 71206
Object array count: 10276
Thread count: 30
Heap total bytes: 10624694
Bitmap count: 170
Bitmap total bytes: 293038536
Large bitmap count: 4
Large bitmap total bytes: 148390448
Db 1: closed /data/user/0/mpackage/databases/frnsc.s3db
Db 2: closed /data/user/0/mpackage/databases/frnsc.s3db
Db 3: closed /data/user/0/mpackage/databases/frnsc.s3db
Stats: LruCache[maxSize=3000,hits=32975,misses=68391,hitRate=32%]
RandomAccess[bytes=3762398,reads=68391,travel=15029771222,range=13539355,size=16
550259]
Analysis duration: 18288 ms```