LeakCanary를 적용해서 메모리 누수를 해결하자

debugImplementation 'com.squareup.leakcanary:leakcanary-android:2.7'

D/LeakCanary: Found 2 objects retained, not dumping heap yet (app is visible & < 5 threshold)

D/LeakCanary: D/LeakCanary: ==================================== D/LeakCanary: HEAP ANALYSIS RESULT D/LeakCanary: ==================================== D/LeakCanary: 2 APPLICATION LEAKS D/LeakCanary: References underlined with "~~~" are likely causes. D/LeakCanary: Learn more at https://squ.re/leaks. D/LeakCanary: 2794 bytes retained by leaking objects D/LeakCanary: Signature: c035c3809c96df4027ca1a434041f9edcfeacd97 D/LeakCanary: ┬─── D/LeakCanary: │ GC Root: System class D/LeakCanary: │ D/LeakCanary: ├─ android.provider.FontsContract class D/LeakCanary: │ Leaking: NO (SingVanaApplication↓ is not leaking and a class is never leaking) D/LeakCanary: │ ↓ static FontsContract.sContext D/LeakCanary: ├─ com.singvana.app.SingVanaApplication instance D/LeakCanary: │ Leaking: NO (SongsFragment↓ is not leaking and Application is a singleton) D/LeakCanary: │ mBase instance of android.app.ContextImpl D/LeakCanary: │ ↓ Hilt_SingVanaApplication.componentManager D/LeakCanary: ├─ dagger.hilt.android.internal.managers.ApplicationComponentManager instance D/LeakCanary: │ Leaking: NO (SongsFragment↓ is not leaking) D/LeakCanary: │ ↓ ApplicationComponentManager.component D/LeakCanary: ├─ com.singvana.app.DaggerSingVanaApplication_HiltComponents_SingletonC instance D/LeakCanary: │ Leaking: NO (SongsFragment↓ is not leaking) D/LeakCanary: │ ↓ DaggerSingVanaApplication_HiltComponents_SingletonC.horizontalContainerRepository D/LeakCanary: ├─ com.singvana.app.ui.common.HorizontalContainerRepository instance D/LeakCanary: │ Leaking: NO (SongsFragment↓ is not leaking) D/LeakCanary: │ ↓ HorizontalContainerRepository.onTouch D/LeakCanary: ├─ com.singvana.app.ui.main.songs.SongsFragment$initTabPager$2 instance D/LeakCanary: │ Leaking: NO (SongsFragment↓ is not leaking) D/LeakCanary: │ Anonymous subclass of kotlin.jvm.internal.Lambda D/LeakCanary: │ ↓ SongsFragment$initTabPager$2.this$0 D/LeakCanary: ├─ com.singvana.app.ui.main.songs.SongsFragment instance D/LeakCanary: │ Leaking: NO (Fragment#mFragmentManager is not null) D/LeakCanary: │ componentContext instance of dagger.hilt.android.internal.managers.ViewComponentManager$FragmentContextWrapper, D/LeakCanary: │ wrapping activity com.singvana.app.ui.main.MainActivity with mDestroyed = false D/LeakCanary: │ ↓ SongsFragment.tabPager$delegate D/LeakCanary: │ ~~~~~~~~~~~~~~~~~ D/LeakCanary: ├─ kotlin.SynchronizedLazyImpl instance D/LeakCanary: │ Leaking: UNKNOWN D/LeakCanary: │ Retaining 63.4 kB in 969 objects D/LeakCanary: │ ↓ SynchronizedLazyImpl._value D/LeakCanary: │ ~~~~~~ D/LeakCanary: ├─ com.singvana.app.util.TabPager instance D/LeakCanary: │ Leaking: UNKNOWN D/LeakCanary: │ Retaining 63.4 kB in 968 objects D/LeakCanary: │ ↓ TabPager.tabLayout D/LeakCanary: │ ~~~~~~~~~ D/LeakCanary: ├─ com.google.android.material.tabs.TabLayout instance D/LeakCanary: │ Leaking: UNKNOWN D/LeakCanary: │ Retaining 19.4 kB in 303 objects D/LeakCanary: │ View not part of a window view hierarchy D/LeakCanary: │ View.mAttachInfo is null (view detached) D/LeakCanary: │ View.mID = R.id.tabLayout D/LeakCanary: │ View.mWindowAttachCount = 1 D/LeakCanary: │ mContext instance of dagger.hilt.android.internal.managers.ViewComponentManager$FragmentContextWrapper, wrapping D/LeakCanary: │ activity com.singvana.app.ui.main.MainActivity with mDestroyed = false D/LeakCanary: │ ↓ View.mParent D/LeakCanary: │ ~~~~~~~ D/LeakCanary: ├─ androidx.constraintlayout.widget.ConstraintLayout instance D/LeakCanary: │ Leaking: UNKNOWN D/LeakCanary: │ Retaining 20.0 kB in 274 objects D/LeakCanary: │ View not part of a window view hierarchy D/LeakCanary: │ View.mAttachInfo is null (view detached) D/LeakCanary: │ View.mID = R.id.tab_pager D/LeakCanary: │ View.mWindowAttachCount = 1 D/LeakCanary: │ mContext instance of dagger.hilt.android.internal.managers.ViewComponentManager$FragmentContextWrapper, wrapping D/LeakCanary: │ activity com.singvana.app.ui.main.MainActivity with mDestroyed = false D/LeakCanary: │ ↓ View.mParent D/LeakCanary: │ ~~~~~~~ D/LeakCanary: ╰→ androidx.constraintlayout.widget.ConstraintLayout instance D/LeakCanary: Leaking: YES (ObjectWatcher was watching this because com.singvana.app.ui.main.songs.SongsFragment received D/LeakCanary: Fragment#onDestroyView() callback (references to its views should be cleared to prevent leaks)) D/LeakCanary: Retaining 2.8 kB in 66 objects D/LeakCanary: key = b7c8dbb9-883a-4a7a-88a0-535c901cebb7 D/LeakCanary: watchDurationMillis = 172013 D/LeakCanary: retainedDurationMillis = 167011 D/LeakCanary: View not part of a window view hierarchy D/LeakCanary: View.mAttachInfo is null (view detached) D/LeakCanary: View.mWindowAttachCount = 1 D/LeakCanary: mContext instance of dagger.hilt.android.internal.managers.ViewComponentManager$FragmentContextWrapper, wrapping D/LeakCanary: activity com.singvana.app.ui.main.MainActivity with mDestroyed = false D/LeakCanary: 3294 bytes retained by leaking objects D/LeakCanary: Signature: 1f677cb987fbf67c1fe3a8b879f5878ece297bd D/LeakCanary: ┬─── D/LeakCanary: │ GC Root: System class D/LeakCanary: │ D/LeakCanary: ├─ android.app.ActivityThread class D/LeakCanary: │ Leaking: NO (MainActivity↓ is not leaking and a class is never leaking) D/LeakCanary: │ ↓ static ActivityThread.sCurrentActivityThread D/LeakCanary: ├─ android.app.ActivityThread instance D/LeakCanary: │ Leaking: NO (MainActivity↓ is not leaking) D/LeakCanary: │ mInitialApplication instance of com.singvana.app.SingVanaApplication D/LeakCanary: │ mSystemContext instance of android.app.ContextImpl D/LeakCanary: │ mSystemUiContext instance of android.app.ContextImpl D/LeakCanary: │ ↓ ActivityThread.mTopActivityClient D/LeakCanary: ├─ android.app.ActivityThread$ActivityClientRecord instance D/LeakCanary: │ Leaking: NO (MainActivity↓ is not leaking) D/LeakCanary: │ activity instance of com.singvana.app.ui.main.MainActivity with mDestroyed = false D/LeakCanary: │ ↓ ActivityThread$ActivityClientRecord.activity D/LeakCanary: ├─ com.singvana.app.ui.main.MainActivity instance D/LeakCanary: │ Leaking: NO (SongsDetailFragment↓ is not leaking and Activity#mDestroyed is false) D/LeakCanary: │ mApplication instance of com.singvana.app.SingVanaApplication D/LeakCanary: │ mBase instance of androidx.appcompat.view.ContextThemeWrapper D/LeakCanary: │ ↓ ComponentActivity.mActivityResultRegistry D/LeakCanary: ├─ androidx.activity.ComponentActivity$2 instance D/LeakCanary: │ Leaking: NO (SongsDetailFragment↓ is not leaking) D/LeakCanary: │ Anonymous subclass of androidx.activity.result.ActivityResultRegistry D/LeakCanary: │ this$0 instance of com.singvana.app.ui.main.MainActivity with mDestroyed = false D/LeakCanary: │ ↓ ActivityResultRegistry.mKeyToCallback D/LeakCanary: ├─ java.util.HashMap instance D/LeakCanary: │ Leaking: NO (SongsDetailFragment↓ is not leaking) D/LeakCanary: │ ↓ HashMap.table D/LeakCanary: ├─ java.util.HashMap$Node[] array D/LeakCanary: │ Leaking: NO (SongsDetailFragment↓ is not leaking) D/LeakCanary: │ ↓ HashMap$Node[].[8] D/LeakCanary: ├─ java.util.HashMap$Node instance D/LeakCanary: │ Leaking: NO (SongsDetailFragment↓ is not leaking) D/LeakCanary: │ ↓ HashMap$Node.value D/LeakCanary: ├─ androidx.activity.result.ActivityResultRegistry$CallbackAndContract instance D/LeakCanary: │ Leaking: NO (SongsDetailFragment↓ is not leaking) D/LeakCanary: │ ↓ ActivityResultRegistry$CallbackAndContract.mCallback D/LeakCanary: ├─ androidx.fragment.app.FragmentManager$10 instance D/LeakCanary: │ Leaking: NO (SongsDetailFragment↓ is not leaking) D/LeakCanary: │ Anonymous class implementing androidx.activity.result.ActivityResultCallback D/LeakCanary: │ ↓ FragmentManager$10.this$0 D/LeakCanary: ├─ androidx.fragment.app.FragmentManagerImpl instance D/LeakCanary: │ Leaking: NO (SongsDetailFragment↓ is not leaking) D/LeakCanary: │ ↓ FragmentManager.mParent D/LeakCanary: ├─ com.singvana.app.ui.main.songs.SongsDetailFragment instance D/LeakCanary: │ Leaking: NO (Fragment#mFragmentManager is not null) D/LeakCanary: │ componentContext instance of dagger.hilt.android.internal.managers.ViewComponentManager$FragmentContextWrapper, D/LeakCanary: │ wrapping activity com.singvana.app.ui.main.MainActivity with mDestroyed = false D/LeakCanary: │ Fragment.mTag=f0 D/LeakCanary: │ ↓ SongsDetailFragment.horizontalContainerAdapter$delegate D/LeakCanary: │ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ D/LeakCanary: ├─ kotlin.SynchronizedLazyImpl instance D/LeakCanary: │ Leaking: UNKNOWN D/LeakCanary: │ Retaining 20 B in 1 objects D/LeakCanary: │ ↓ SynchronizedLazyImpl._value D/LeakCanary: │ ~~~~~~ D/LeakCanary: ├─ com.singvana.app.ui.common.HorizontalContainerAdapter instance D/LeakCanary: │ Leaking: UNKNOWN D/LeakCanary: │ Retaining 288 B in 15 objects D/LeakCanary: │ ↓ HorizontalContainerAdapter.onScrollToPosition D/LeakCanary: │ ~~~~~~~~~~~~~~~~~~ D/LeakCanary: ├─ com.singvana.app.ui.common.HorizontalContainerAdapter$Holder$1 instance D/LeakCanary: │ Leaking: UNKNOWN D/LeakCanary: │ Retaining 16 B in 1 objects D/LeakCanary: │ Anonymous subclass of kotlin.jvm.internal.Lambda D/LeakCanary: │ ↓ HorizontalContainerAdapter$Holder$1.this$0 D/LeakCanary: │ ~~~~~~ D/LeakCanary: ├─ com.singvana.app.ui.common.HorizontalContainerAdapter$Holder instance D/LeakCanary: │ Leaking: UNKNOWN D/LeakCanary: │ Retaining 120 B in 2 objects D/LeakCanary: │ ↓ RecyclerView$ViewHolder.mOwnerRecyclerView D/LeakCanary: │ ~~~~~~~~~~~~~~~~~~ D/LeakCanary: ├─ androidx.recyclerview.widget.RecyclerView instance D/LeakCanary: │ Leaking: UNKNOWN D/LeakCanary: │ Retaining 32.3 kB in 532 objects D/LeakCanary: │ View not part of a window view hierarchy D/LeakCanary: │ View.mAttachInfo is null (view detached) D/LeakCanary: │ View.mID = R.id.recyclerView D/LeakCanary: │ View.mWindowAttachCount = 1 D/LeakCanary: │ mContext instance of dagger.hilt.android.internal.managers.ViewComponentManager$FragmentContextWrapper, wrapping D/LeakCanary: │ activity com.singvana.app.ui.main.MainActivity with mDestroyed = false D/LeakCanary: │ ↓ View.mParent D/LeakCanary: │ ~~~~~~~ D/LeakCanary: ├─ androidx.swiperefreshlayout.widget.SwipeRefreshLayout instance D/LeakCanary: │ Leaking: UNKNOWN D/LeakCanary: │ Retaining 28.0 kB in 418 objects D/LeakCanary: │ View not part of a window view hierarchy D/LeakCanary: │ View.mAttachInfo is null (view detached) D/LeakCanary: │ View.mID = R.id.refreshLayout D/LeakCanary: │ View.mWindowAttachCount = 1 D/LeakCanary: │ mContext instance of dagger.hilt.android.internal.managers.ViewComponentManager$FragmentContextWrapper, wrapping D/LeakCanary: │ activity com.singvana.app.ui.main.MainActivity with mDestroyed = false D/LeakCanary: │ ↓ View.mParent D/LeakCanary: │ ~~~~~~~ D/LeakCanary: ╰→ androidx.constraintlayout.widget.ConstraintLayout instance D/LeakCanary: Leaking: YES (ObjectWatcher was watching this because com.singvana.app.ui.main.songs.SongsDetailFragment received D/LeakCanary: Fragment#onDestroyView() callback (references to its views should be cleared to prevent leaks)) D/LeakCanary: Retaining 3.3 kB in 54 objects D/LeakCanary: key = 9ee99d31-d7cf-4321-bf93-5406bfef78b9 D/LeakCanary: watchDurationMillis = 172014 D/LeakCanary: retainedDurationMillis = 167011 D/LeakCanary: View not part of a window view hierarchy D/LeakCanary: View.mAttachInfo is null (view detached) D/LeakCanary: View.mWindowAttachCount = 1 D/LeakCanary: mContext instance of dagger.hilt.android.internal.managers.ViewComponentManager$FragmentContextWrapper, wrapping D/LeakCanary: activity com.singvana.app.ui.main.MainActivity with mDestroyed = false D/LeakCanary: ==================================== D/LeakCanary: 0 LIBRARY LEAKS D/LeakCanary: A Library Leak is a leak caused by a known bug in 3rd party code that you do not have control over. D/LeakCanary: See https://square.github.io/leakcanary/fundamentals-how-leakcanary-works/#4-categorizing-leaks D/LeakCanary: ==================================== D/LeakCanary: 0 UNREACHABLE OBJECTS D/LeakCanary: An unreachable object is still in memory but LeakCanary could not find a strong reference path D/LeakCanary: from GC roots. D/LeakCanary: ==================================== D/LeakCanary: METADATA D/LeakCanary: Please include this in bug reports and Stack Overflow questions. D/LeakCanary: Build.VERSION.SDK_INT: 30 D/LeakCanary: Build.MANUFACTURER: samsung D/LeakCanary: LeakCanary version: 2.7 D/LeakCanary: App process name: com.singvana.app D/LeakCanary: Stats: LruCache[maxSize=3000,hits=7349,misses=144157,hitRate=4%] D/LeakCanary: RandomAccess[bytes=7738904,reads=144157,travel=85703839598,range=44141375,size=54828669] D/LeakCanary: Heap dump reason: user request D/LeakCanary: Analysis duration: 7300 ms D/LeakCanary: Heap dump file path: /storage/emulated/0/Download/leakcanary-com.singvana.app/2021-10-01_14-52-06_637.hprof D/LeakCanary: Heap dump timestamp: 1633067536774 D/LeakCanary: Heap dump duration: 2418 ms D/LeakCanary: ====================================

override fun onDestroyView() { recyclerView.adapter = null super.onDestroyView() }

tabLayoutMediator.detach() viewPager.adapter = null tabLayout.removeOnTabSelectedListener(tabOnTabSelectedListener) tabLayout.clearOnTabSelectedListeners() viewPager.unregisterOnPageChangeCallback(onPageChangeCallback) viewPager.clearDisappearingChildren() tabPager.rootLayout.removeAllViews() rootLayout.removeAllViews()

var onClick: ((CollaboDetail) -> Unit)? = null var onClickSing: ((CollaboDetail) -> Unit)? = null var onClickCollaboCount: ((CollaboDetail) -> Unit)? = null var onClickTrash: ((CollaboDetail, Int) -> Unit)? = null var onClickProfile: ((CollaboDetail) -> Unit)? = null

recyclerView.adapter = null rootLayout = removeAllViews() adapter.clearFunctions() /*adapter.clearFunctions() onClick = null onClickSing = null onClickCollaboCount = null onClickTrash = null onClickProfile = null */ player.clearMediaItems() player.release() /* player = SimpleExoPlayer.Builder(requireContext()).build() */

import androidx.fragment.app.Fragment import androidx.lifecycle.DefaultLifecycleObserver import androidx.lifecycle.LifecycleOwner import com.singvana.app.remote.CollaboDetail import kotlin.properties.ReadWriteProperty import kotlin.reflect.KProperty class AutoClearedValue<T : Any>(val fragment: Fragment) : ReadWriteProperty<Fragment, T> { private var _value: T? = null init { fragment.lifecycle.addObserver(object : DefaultLifecycleObserver { override fun onCreate(owner: LifecycleOwner) { fragment.viewLifecycleOwnerLiveData.observe(fragment) { viewLifecycleOwner -> viewLifecycleOwner?.lifecycle?.addObserver(object : DefaultLifecycleObserver { override fun onDestroy(owner: LifecycleOwner) { _value = null } }) } } }) } override fun getValue(thisRef: Fragment, property: KProperty<*>): T { return _value ?: throw IllegalStateException("should never call auto-cleared-value get when it might not be available") } override fun setValue(thisRef: Fragment, property: KProperty<*>, value: T) { _value = value } } /** * Creates an [AutoClearedValue] associated with this fragment. */ fun <T : Any> Fragment.autoCleared() = AutoClearedValue<T>(this)

class AutoClearedValue<T : Any>(val fragment: Fragment, var onDestroy: (T) -> Unit) : ReadWriteProperty<Fragment, T> { private var _value: T? = null init { fragment.lifecycle.addObserver(object : DefaultLifecycleObserver { override fun onCreate(owner: LifecycleOwner) { fragment.viewLifecycleOwnerLiveData.observe(fragment) { viewLifecycleOwner -> viewLifecycleOwner?.lifecycle?.addObserver(object : DefaultLifecycleObserver { override fun onDestroy(owner: LifecycleOwner) { _value?.let { onDestroy.invoke(it) } _value = null } }) } } }) } override fun getValue(thisRef: Fragment, property: KProperty<*>): T { return _value ?: throw IllegalStateException("should never call auto-cleared-value get when it might not be available") } override fun setValue(thisRef: Fragment, property: KProperty<*>, value: T) { _value = value } } /** * Creates an [AutoClearedValue] associated with this fragment. */ fun <T : Any> Fragment.autoCleared(onDestroy : (T)->Unit) = AutoClearedValue<T>(this, onDestroy)

abstract class BaseFragment<B : ViewDataBinding>(@LayoutRes val layoutId: Int) : Fragment() { protected var binding by autoCleared<B>(onDestroy = { onDestroyBindingView(it) }) override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? { binding = DataBindingUtil.inflate(inflater,layoutId, container, false) return binding.root } final override fun onViewCreated(view: View, savedInstanceState: Bundle?) { binding.lifecycleOwner = this onViewCreated(savedInstanceState) } . . .

class UsingFragment : BaseFragment<FragmenUsingBinding>(R.layout.fragment_using) { . . . override fun onDestroyBindingView(b: FragmenUsingBinding) { player.clearMediaItems() player.release() b.recyclerView.adapter = null b.rootLayout.removeAllViews() singWithMeAdapter.clearFunctions() collaboAdapter.clearFunctions() } }