问题描述
经过多次轮换和应用程序在后台运行后，我发现此泄漏。这是堆栈跟踪，我无法理解原因。另外 32474006 字节保留的对象非常多。我有 10 个相同的泄漏。
32474006 bytes retained by leaking objects
displaying only 1 leak trace out of 10 with the same signature
Signature: 329ec5b3be0cfe3ed2fc888129f5a6be93fb9
┬───
│ GC Root: Global variable in native code
│
├─ android.app.LoadedApk$Servicedispatcher$DeathMonitor instance
│ Leaking: UNKNowN
│ ↓ LoadedApk$Servicedispatcher$DeathMonitor.this$0
│ ~~~~~~
├─ android.app.LoadedApk$Servicedispatcher instance
│ Leaking: UNKNowN
│ ↓ LoadedApk$Servicedispatcher.mContext
│ ~~~~~~~~
╰→ com.ics.homework.ui.MainActivity instance
Leaking: YES (ObjectWatcher was watching this because com.ics.homework.ui.MainActivity received Activity#onDestroy() callback and Activity#mDestroyed is true)
key = 8bcc50f8-ea3f-47d9-8dc3-904042a58df4
watchDurationMillis = 60220
retainedDurationMillis = 55216
====================================
0 LIBRARY LEAKS
泄漏原因
@AndroidEntryPoint
class MainActivity : AppCompatActivity(),NavController.OnDestinationChangedListener {
....
override fun onStart() {
super.onStart()
findChromeCustomTabsNavigator(navController).bindCustomTabsService()
}
....
}
我尝试使用 This Tutorial
实现 Chrome 自定义标签@Navigator.Name("chrome")
class ChromeCustomTabsNavigator(
private val context: Context
) : Navigator<ChromeCustomTabsNavigator.Destination>() {
/**
* Initialized when `findChromeCustomTabsNavigator().bindCustomTabsService()` is called.
*/
private var session: CustomTabsSession? = null
private val urisInProgress = mutableMapOf<Uri,Long>()
private var connection :CustomTabsServiceConnection?= null
/**
* Prevent the user from repeatedly launching Chrome Custom Tabs for the same URL. Throttle
* rapid repeats unless the URL has finished loading,or this timeout has passed (just in
* case something went wrong with detecting that the page finished loading).
* Feel free to change this value with [Fragment.findChromeCustomTabsNavigator.throttleTimeout()]
* if you feel the need,or for testing purposes.
* Defaults to two seconds.
*/
@SuppressWarnings("WeakerAccess")
var throttleTimeout: Long = 2000L
private val upIconBitmap: Bitmap by lazy {
AppCompatResources.getDrawable(context,R.drawable.ic_baseline_keyboard_backspace_24)?.toBitmap()!!
}
override fun createDestination() =
Destination(this)
override fun navigate(
destination: Destination,args: Bundle?,navOptions: NavOptions?,navigatorExtras: Extras?
): NavDestination? {
// The Navigation framework enforces the destination URL being non-null
val uri = args?.getParcelable<Uri>(KEY_URI)!!
if (!shouldAllowLaunch(uri)) return null
buildCustomTabsIntent(destination).launchUrl(context,uri)
return null // Do not add to the back stack,managed by Chrome Custom Tabs
}
override fun popBackStack() = true // Managed by Chrome Custom Tabs
private fun buildCustomTabsIntent(destination: Destination): CustomTabsIntent {
val builder = CustomTabsIntent.Builder()
val params = CustomTabColorSchemeParams.Builder()
session?.let { builder.setSession(it) }
builder.setColorScheme(destination.colorScheme)
if (destination.toolbarColor != 0) {
params.setToolbarColor(ContextCompat.getColor(context,destination.toolbarColor))
}
if (destination.navigationBarColor != 0) {
params.setNavigationBarColor(ContextCompat.getColor(context,destination.navigationBarColor))
}
builder.setDefaultColorSchemeParams(params.build())
builder.setStartAnimations(context,destination.enteranim,destination.popEnteranim)
builder.setExitAnimations(context,destination.popExitAnim,destination.exitAnim)
builder.setShowTitle(destination.showTitle)
if (destination.upInsteadOfClose) {
builder.setCloseButtonIcon(upIconBitmap)
}
if (destination.addDefaultShareMenuItem) {
builder.setShareState(CustomTabsIntent.SHARE_STATE_ON)
}
val customTabsIntent = builder.build()
// Adding referrer so websites kNow where their traffic came from,per Google's recommendations:
// https://medium.com/google-developers/best-practices-for-custom-tabs-5700e55143ee
customTabsIntent.intent.putExtra(
Intent.EXTRA_REFERRER,Uri.parse("android-app://" + context.packageName)
)
return customTabsIntent
}
private fun shouldAllowLaunch(uri: Uri): Boolean {
urisInProgress[uri]?.let { tabStartTime ->
// Have we launched this URI before recently?
if (System.currentTimeMillis() - tabStartTime > throttleTimeout) {
// Since we've exceeded the throttle timeout,continue as normal,launching
// the destination and updating the time.
Timber.w("Throttle timeout for $uri exceeded. This means ChromeCustomTabsNavigator Failed to accurately determine that the URL finished loading. If you see this error frequently,it Could indicate a bug in ChromeCustomTabsNavigator.")
} else {
// The user has tried to repeatedly open the same URL in rapid succession. Let them chill.
// The tab probably just hasn't opened yet. Abort opening the tab a second time.
urisInProgress.remove(uri)
return false
}
}
urisInProgress[uri] = System.currentTimeMillis()
return true
}
/**
* Boilerplate setup for Chrome Custom Tabs. This should suffice for most apps using Chrome
* Custom Tabs with the Navigation component. It warms up Chrome in advance to save a few
* milliseconds,and sets a [CustomTabsSession] for the [ChromeCustomTabsNavigator] so that
* [CustomTabsSession.mayLaunchUrl] can be called from application code.
*/
fun bindCustomTabsService() {
connection = object : CustomTabsServiceConnection() {
override fun onCustomTabsServiceConnected(name: ComponentName,client: CustomTabsClient) {
client.warmup(0L)
session = client.newSession(customTabsCallback)
//context.unbindService(this)
}
override fun onServicedisconnected(name: ComponentName?) {}
}
CustomTabsClient.bindCustomTabsService(context,CUSTOM_TAB_PACKAGE_NAME,connection!!)
}
fun unBindCustomTabsService(){
if(connection !=null) return
context.unbindService(connection!!)
}
/**
* Possibly pre-load one or more URLs. Note that
* per https://developer.chrome.com/multidevice/android/customtabs#pre-render-content,* mayLaunchUrl should only be used if the odds are at least 50% of the user clicking
* the link.
* @see [CustomTabsSession.mayLaunchUrl] for more details on mayLaunchUrl.
*/
fun mayLaunchUrl(url: Uri,extras: Bundle? = null,otherLikelyBundles: List<Bundle>? = null) {
session?.mayLaunchUrl(url,extras,otherLikelyBundles)
}
val customTabsCallback: CustomTabsCallback by lazy {
object : CustomTabsCallback() {
override fun onNavigationEvent(navigationEvent: Int,extras: Bundle?) {
when (navigationEvent) {
NAVIGATION_ABORTED,NAVIGATION_Failed,NAVIGATION_FINISHED -> {
// Navigation has finished. Remove the indication that page has not finished
// loading,so we will allow the user to try to open the same page again.
with(urisInProgress.entries) {
remove(first())
}
}
}
}
}
}
companion object {
private const val TAG = "ChroMetabsNavigator"
private const val CUSTOM_TAB_PACKAGE_NAME = "com.android.chrome"
const val KEY_URI = "uri"
}
@NavDestination.Classtype(Activity::class)
class Destination(navigator: Navigator<out NavDestination>) : NavDestination(navigator) {
var colorScheme: Int = 1
@ColorRes
var toolbarColor: Int = 0
@ColorRes
var navigationBarColor: Int = 0
@AnimRes
var enteranim: Int = 0
@AnimRes
var exitAnim: Int = 0
@AnimRes
var popEnteranim: Int = 0
@AnimRes
var popExitAnim: Int = 0
var showTitle: Boolean = false
var upInsteadOfClose: Boolean = false
var addDefaultShareMenuItem: Boolean = false
override fun onInflate(context: Context,attrs: AttributeSet) {
super.onInflate(context,attrs)
context.withStyledAttributes(attrs,R.styleable.ChromeCustomTabsNavigator,0) {
colorScheme = getInt(R.styleable.ChromeCustomTabsNavigator_colorScheme,0)
toolbarColor = getResourceId(R.styleable.ChromeCustomTabsNavigator_toolbarColor,0)
navigationBarColor =
getResourceId(R.styleable.ChromeCustomTabsNavigator_navigationBarColor,0)
enteranim = getResourceId(R.styleable.ChromeCustomTabsNavigator_enteranim,0)
exitAnim = getResourceId(R.styleable.ChromeCustomTabsNavigator_exitAnim,0)
popEnteranim = getResourceId(R.styleable.ChromeCustomTabsNavigator_popEnteranim,0)
popExitAnim = getResourceId(R.styleable.ChromeCustomTabsNavigator_popExitAnim,0)
showTitle = getBoolean(R.styleable.ChromeCustomTabsNavigator_showTitle,false)
upInsteadOfClose =
getBoolean(R.styleable.ChromeCustomTabsNavigator_upInsteadOfClose,false)
addDefaultShareMenuItem =
getBoolean(R.styleable.ChromeCustomTabsNavigator_addDefaultShareMenuItem,false)
}
}
}
}
/**
* From https://proandroiddev.com/add-chrome-custom-tabs-to-the-android-navigation-component-75092ce20c6a
*/
class EnhancednavHostFragment : NavHostFragment() {
@SuppressLint("RestrictedApi")
override fun onCreateNavController(navController: NavController) {
super.onCreateNavController(navController)
context?.let { navController.navigatorProvider += ChromeCustomTabsNavigator(it) }
}
}
扩展功能
fun Fragment.findChromeCustomTabsNavigator(): ChromeCustomTabsNavigator =
findNavController().navigatorProvider.getNavigator(ChromeCustomTabsNavigator::class.java)
fun AppCompatActivity.findChromeCustomTabsNavigator(navController: NavController): ChromeCustomTabsNavigator =
navController.navigatorProvider.getNavigator(ChromeCustomTabsNavigator::class.java)
注意我在主要活动中绑定服务，因为我必须在抽屉中使用自定义选项卡以及一些片段。
EnhancednavHostFragment- 在主活动布局内添加
<androidx.fragment.app.FragmentContainerView
android:id="@+id/fragmentContainerView"
android:name="com.ics.homework.utils.EnhancednavHostFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:defaultNavHost="true"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/toolbar"
app:navGraph="@navigation/main_nav_graph" />
解决方法
这看起来像是 Android 框架代码中的漏洞，您可以通过查看 LoadedApk.java 的源代码来发现。
当一个单独的进程连接到您的进程中的服务时，会创建一个 ServiceDispatcher.DeathMonitor。这用于在连接的进程终止时通知 LoadedApk。
这里的泄漏发生是因为服务被破坏了，但不知何故对 DeathMonitor 的本机引用没有被释放。这似乎意味着 IBinder.unleakToDeath() 没有被 LoadedApk 调用。
您应该尝试在最新的 Android 版本上重现，看看错误是否仍然存在。如果是，请在 AOSP 中提交错误。
,看起来泄漏是由线路引起的：
navController.addOnDestinationChangedListener(this)
在这里，您将 Activity 的实例传递给控制器，但在 Activity 被销毁时永远不会将其删除，因此会发生泄漏。
我建议在 onResume 中添加侦听器并在 onPause 中将其删除。