Question

以下是Leakcanary SDK提供的泄漏说明。从下面的行无法检测到我必须在哪一行进行更改以使代码可行，因为描述仅给出了类名，而没有给出特定的代码。

ApplicationLeak(className=com.pilotflyingj.plugin.a_android.ui.component.loyalty.RewardFragment, leakTrace=
┬
├─ android.view.inputmethod.InputMethodManager
│    Leaking: NO (InputMethodManager↓ is not leaking and a class is never leaking)
│    GC Root: System class
│    ↓ static InputMethodManager.sInstance
├─ android.view.inputmethod.InputMethodManager
│    Leaking: NO (DecorView↓ is not leaking and InputMethodManager is a singleton)
│    ↓ InputMethodManager.mNextServedView
├─ com.android.internal.policy.DecorView
│    Leaking: NO (View attached)
│    mContext instance of com.android.internal.policy.DecorContext, wrapping activity com.pilotflyingj.plugin.a_android.ui.component.main.MainFrameActivity with mDestroyed = false
│    Parent android.view.ViewRootImpl not a android.view.View
│    View#mParent is set
│    View#mAttachInfo is not null (view attached)
│    View.mWindowAttachCount = 1
│    ↓ DecorView.mAttachInfo
│                ~~~~~~~~~~~
├─ android.view.View$AttachInfo
│    Leaking: UNKNOWN
│    ↓ View$AttachInfo.mTreeObserver
│                      ~~~~~~~~~~~~~
├─ android.view.ViewTreeObserver
│    Leaking: UNKNOWN
│    ↓ ViewTreeObserver.mOnScrollChangedListeners
│                       ~~~~~~~~~~~~~~~~~~~~~~~~~
├─ android.view.ViewTreeObserver$CopyOnWriteArray
│    Leaking: UNKNOWN
│    ↓ ViewTreeObserver$CopyOnWriteArray.mData
│                                        ~~~~~
├─ java.util.ArrayList
│    Leaking: UNKNOWN
│    ↓ ArrayList.elementData
│                ~~~~~~~~~~~
├─ java.lang.Object[]
│    Leaking: UNKNOWN
│    ↓ array Object[].[2]
│                     ~~~
├─ com.pilotflyingj.plugin.a_android.ui.component.loyalty.-$$Lambda$RewardFragment$-e5xQ8M432-uGOrhL3ajFrvOVQg
│    Leaking: UNKNOWN
│    ↓ -$$Lambda$RewardFragment$-e5xQ8M432-uGOrhL3ajFrvOVQg.f$0
│                                                           ~~~
╰→ com.pilotflyingj.plugin.a_android.ui.component.loyalty.RewardFragment
     Leaking: YES (Fragment#mFragmentManager is null and ObjectWatcher was watching this)
     key = 11be43e3-0bcf-42fb-a087-025e52576844
     watchDurationMillis = 8225
     retainedDurationMillis = 3220
, retainedHeapByteSize=8730107)```


How to detech exact line of leak in class. Above is the leak description provided by leakcanary sdk.

Answer 1

打开com.pilotflyingj.plugin.a_android.ui.component.loyalty.RewardFragment类，然后查找ViewTreeObserver.OnScrollChangedListener的实现。

发生泄漏是因为RewardFragment在ViewTreeObserver上设置了一个OnScrollChangedListener，但在该片段被销毁时并未将其删除。

如何在课堂上检测出确切发生泄漏的地方

1 个答案: