android - LeakCanary 没有提供足够的信息来识别泄漏

Question

我正在使用 LeakCanary，但堆分析结果没有提供足够的信息来检测任何泄漏。它只提到 Activity 正在泄漏。

D/LeakCanary: ​
    ====================================
    HEAP ANALYSIS RESULT
    ====================================
    1 APPLICATION LEAKS
    
    References underlined with "~~~" are likely causes.
    Learn more at https://squ.re/leaks.
    
    298153 bytes retained by leaking objects
    Signature: a610bac3ef989ac5dc5a69244fc2882de5617
    ┬───
    │ GC Root: System class
    │
    ├─ android.provider.FontsContract class
    │    Leaking: NO (MyApplication↓ is not leaking and a class is never leaking)
    │    ↓ static FontsContract.sContext
    ├─ com.example.MyApplication instance
    │    Leaking: NO (Application is a singleton)
    │    mBoundService instance of com.example.services.SessionService
    │    mBase instance of android.app.ContextImpl
    │    ↓ Application.mLoadedApk
    │                  ~~~~~~~~~~
    ├─ android.app.LoadedApk instance
    │    Leaking: UNKNOWN
    │    Retaining 302.8 kB in 4641 objects
    │    mApplication instance of com.example.MyApplication
    │    ↓ LoadedApk.mReceivers
    │                ~~~~~~~~~~
    ├─ android.util.ArrayMap instance
    │    Leaking: UNKNOWN
    │    Retaining 301.7 kB in 4615 objects
    │    ↓ ArrayMap.mArray
    │               ~~~~~~
    ├─ java.lang.Object[] array
    │    Leaking: UNKNOWN
    │    Retaining 301.7 kB in 4613 objects
    │    ↓ Object[].[2]
    │               ~~~
    ╰→ com.example.activities.SelectActivity instance
    ​     Leaking: YES (ObjectWatcher was watching this because com.example.activities.SelectActivity received
    ​     Activity#onDestroy() callback and Activity#mDestroyed is true)
    ​     Retaining 298.2 kB in 4579 objects
    ​     key = 68660c30-bc17-4a74-a5e2-c54f6d676c59
    ​     watchDurationMillis = 5185
    ​     retainedDurationMillis = 183
    ​     mApplication instance of com.example.MyApplication
    ​     mBase instance of androidx.appcompat.view.ContextThemeWrapper
    ====================================
    0 LIBRARY LEAKS

我从这个跟踪中知道的是 SelectActivity 正在泄漏。但我想不通为什么？该 Activity 本身有 1000 多行，我希望除了遍历每一行并检查可能的泄漏候选之外是否有任何捷径。

Answer 1

Activity 是否注册任何广播接收器？泄漏跟踪显示 LoadedApk.mReceivers，它是接收器到接收器调度器的 ArrayMap， Activity 是接收器调度器。