三星Android 13（One UI 5）含WebView的Activity内存泄漏问题排查

我们通过LeakCanary工具检测发现，搭载Android 13（One UI 5）的三星设备上，使用WebView的Activity存在内存泄漏问题：用户关闭Activity后，即便onDestroy()方法已执行，该Activity仍驻留在内存中，受影响设备的ANR（应用无响应）情况明显增加。该问题在运行Android 13的Pixel 4设备上无法复现。

只需加载包含WebView的布局并关闭Activity，即可触发该内存泄漏。以下是可复现问题的代码及LeakCanary检测报告：

AndroidManifest.xml #

<activity
  android:name=".HomeActivity"
  android:exported="false"
  android:theme="@style/AppTheme.NoActionBar">
</activity> 

activity_home.xml（包含WebView组件） #

<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="br.com.gabba.myapp.presentation.WebViewActivity"
    tools:viewBindingIgnore="true">

    <com.google.android.material.appbar.AppBarLayout
        android:id="@+id/appBarLayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/AppTheme.AppBarOverlay"
        android:background="@drawable/bg_header"
        android:gravity="bottom"
        app:elevation="0dp">

        <androidx.appcompat.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:paddingStart="8dp"
            app:contentInsetLeft="0dp"
            app:contentInsetStart="0dp"
            app:contentInsetStartWithNavigation="0dp"
            app:popupTheme="@style/AppTheme.PopupOverlay"
            app:title="@string/app_name"
            app:titleTextAppearance="@style/Toolbar.TitleTextExterno" />

    </com.google.android.material.appbar.AppBarLayout>

    <FrameLayout
        android:id="@+id/frameLayout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior">

        <WebView
            android:id="@+id/webview"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />


    </FrameLayout>

</androidx.coordinatorlayout.widget.CoordinatorLayout>

HomeActivity.kt（加载含WebView的布局即可触发问题） #

package br.com.gabba.myapp.presentation

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import br.com.gabba.myapp.R

class HomeActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_home)
    }
}

app/build.gradle #

(...)
implementation 'androidx.activity:activity-ktx:1.6.1'

(...)
debugImplementation 'com.squareup.leakcanary:leakcanary-android:2.10'

LeakCanary检测报告 #

│ GC Root: Global variable in native code
                                                                                                │
                                                                                                ├─ J1 instance
                                                                                                │    Leaking: UNKNOWN
                                                                                                │    Retaining 137,3 kB in 1971 objects
                                                                                                │    ↓ WindowAndroid.p
                                                                                                │                    ~
                                                                                                ├─ b30 instance
                                                                                                │    Leaking: UNKNOWN
                                                                                                │    Retaining 136,2 kB in 1930 objects
                                                                                                │    ↓ b30.b
                                                                                                │          ~
                                                                                                ├─ com.android.internal.policy.PhoneWindow instance
                                                                                                │    Leaking: YES (Window#mDestroyed is true)
                                                                                                │    Retaining 136,2 kB in 1929 objects
                                                                                                │    mContext instance of br.com.gabba.myapp.presentation.HomeActivity with mDestroyed = true
                                                                                                │    mOnWindowDismissedCallback instance of br.com.gabba.myapp.presentation.HomeActivity with mDestroyed = true
                                                                                                │    ↓ Window.mContext
                                                                                                ╰→ br.com.gabba.myapp.presentation.HomeActivity instance
                                                                                                ​     Leaking: YES (ObjectWatcher was watching this because br.com.gabba.myapp.presentation.HomeActivity received
                                                                                                ​     Activity#onDestroy() callback and Activity#mDestroyed is true)
                                                                                                ​     Retaining 6,8 kB in 245 objects
                                                                                                ​     key = afa4c248-0006-4b43-9660-d2131e74893a
                                                                                                ​     watchDurationMillis = 8817
                                                                                                ​     retainedDurationMillis = 3814
                                                                                                ​     mApplication instance of br.com.gabba.myapp.myappApplication
                                                                                                ​     mBase instance of androidx.appcompat.view.ContextThemeWrapper
                                                                                                
                                                                                                METADATA
                                                                                                
                                                                                                Build.VERSION.SDK_INT: 33
                                                                                                Build.MANUFACTURER: samsung
                                                                                                LeakCanary version: 2.10
                                                                                                App process name: br.com.gabba.myapp
                                                                                                Class count: 29960
                                                                                                Instance count: 230083
                                                                                                Primitive array count: 152647
                                                                                                Object array count: 33977
                                                                                                Thread count: 72
                                                                                                Heap total bytes: 32257183
                                                                                                Bitmap count: 7
                                                                                                Bitmap total bytes: 5674439
                                                                                                Large bitmap count: 0
                                                                                                Large bitmap total bytes: 0
                                                                                                Db 1: closed /data/user/0/br.com.gabba.myapp/databases/google_app_measurement_local.db
                                                                                                Db 2: open /data/user/0/br.com.gabba.myapp/databases/leaks.db
                                                                                                Db 3: open /data/user/0/br.com.gabba.myapp/databases/com.microsoft.appcenter.persistence
                                                                                                Db 4: open /data/user/0/br.com.gabba.myapp/no_backup/androidx.work.workdb
                                                                                                Db 5: open /data/user/0/br.com.gabba.myapp/databases/com.google.android.datatransport.events
                                                                                                Stats: LruCache[maxSize=3000,hits=119796,misses=220169,hitRate=35%]
                                                                                                RandomAccess[bytes=11094589,reads=220169,travel=116557590219,range=37155332,size=47075038]
                                                                                                Analysis duration: 10730 ms

内容的提问来源于stack exchange，提问作者DRBF