记录一次腾讯X5Webview内存泄漏

作者: TMAC_EAH | 来源:发表于2020-08-11 14:46 被阅读0次

In com.sinochem.farm:3.1.6:13.
* androidx.lifecycle.ReportFragment has leaked:
* WebContentsObserverProxy.!(d)!
* ↳ h.!(a)!
* ↳ ArrayList.!(elementData)!
* ↳ array Object[].!([1])!
* ↳ WebViewChromiumExtension$WebContentsObserverExtension.!(a)!
* ↳ WebViewChromiumExtension.!(i)!
* ↳ X5WebViewAdapter.!(b)!
* ↳ BaseWebActivity.mFragments
* ↳ FragmentController.mHost
* ↳ Activity$HostCallbacks.mFragmentManager
* ↳ FragmentManagerImpl.mAdded
* ↳ ArrayList.elementData
* ↳ array Object[].[0]
* ↳ ReportFragment

* Reference Key: 15f37e3d-47f3-4fc9-8090-9af903c3ef44
* Device: HUAWEI HONOR PCT-AL10 PCT-AL10
* Android Version: 10 API: 29 LeakCanary: 1.6.2 0ebc1fc
* Durations: watch=5034ms, gc=164ms, heap dump=1965ms, analysis=38701ms

* Details:
* Instance of org.chromium.content.browser.webcontents.WebContentsObserverProxy
|   static $class$dexTypeIndex = 5135
|   static $class$componentType = null
|   static $class$iFields = 2704830752
|   static $class$primitiveType = 131072
|   static $class$ifTable = java.lang.Object[0]@1882063536 (0x702e02b0)
|   static $class$status = -536870912
|   static $class$clinitThreadId = 2177
|   static $class$accessFlags = 524288
|   static $class$classFlags = 0
|   static a = true
|   static $class$extData = null
|   static $class$shadow$_monitor_ = 0
|   static $class$virtualMethodsOffset = 4
|   static $class$sFields = 2704830728
|   static $class$methods = 2704830808
|   static $class$numReferenceInstanceFields = 2
|   static $class$referenceInstanceOffsets = 7
|   static $class$classLoader = dalvik.system.DexClassLoader@317457944 (0x12ec0618)
|   static $class$classSize = 289
|   static $class$objectSize = 32
|   static $class$superClass = org.chromium.content_public.browser.z
|   static $classOverhead = byte[164]@317467689 (0x12ec2c29)
|   static $class$copiedMethodsOffset = 33
|   static $class$vtable = null
|   static $class$objectSizeAllocFastPath = 32
|   static $class$name = null
|   static $class$numReferenceStaticFields = 0
|   static $class$dexCache = java.lang.DexCache@317485664 (0x12ec7260)
|   static $class$shadow$_klass_ = java.lang.Class
|   static $class$dexClassDefIndex = 4297
|   c = -443753536
|   d = org.chromium.base.h@320958936 (0x132171d8)
|   e = org.chromium.base.h$a@320958960 (0x132171f0)
|   b = null
|   shadow$_klass_ = org.chromium.content.browser.webcontents.WebContentsObserverProxy
|   shadow$_monitor_ = 0
* Instance of org.chromium.base.h
|   static $class$dexTypeIndex = 4624
|   static $class$componentType = null
|   static $class$iFields = 3137982920
|   static $class$primitiveType = 131072
|   static $class$ifTable = java.lang.Object[2]@320883848 (0x13204c88)
|   static $class$status = -536870912
|   static $class$clinitThreadId = 2177
|   static $class$accessFlags = 524289
|   static $class$classFlags = 0
|   static b = true
|   static $class$extData = null
|   static $class$shadow$_monitor_ = 0
|   static $class$virtualMethodsOffset = 11
|   static $class$sFields = 3137982896
|   static $class$methods = 3137982992
|   static $class$numReferenceInstanceFields = 1
|   static $class$referenceInstanceOffsets = 1
|   static $class$classLoader = dalvik.system.DexClassLoader@317457944 (0x12ec0618)
|   static $class$classSize = 209
|   static $class$objectSize = 21
|   static $class$superClass = java.lang.Object
|   static $classOverhead = byte[84]@317573561 (0x12edc9b9)
|   static $class$copiedMethodsOffset = 18
|   static $class$vtable = null
|   static $class$objectSizeAllocFastPath = 24
|   static $class$name = null
|   static $class$numReferenceStaticFields = 0
|   static $class$dexCache = java.lang.DexCache@317485664 (0x12ec7260)
|   static $class$shadow$_klass_ = java.lang.Class
|   static $class$dexClassDefIndex = 2610
|   a = java.util.ArrayList@320958984 (0x13217208)
|   c = 0
|   d = 2
|   e = false
|   shadow$_klass_ = org.chromium.base.h
|   shadow$_monitor_ = 0
* Instance of java.util.ArrayList
|   static $class$dexTypeIndex = 1430
|   static EMPTY_ELEMENTDATA = java.lang.Object[0]@1878049872 (0x6ff0c450)
|   static $class$componentType = null
|   st

解决方案：
一顿百度，最终结果就是这个，浪费很久时间，这个能解决内存泄漏，我走了些弯路

 public void onDestroy() {
        if (x5WebView != null) {
//            x5WebView.clearCache(true);
            x5WebView.stopLoading();
            x5WebView.removeAllViewsInLayout();
            x5WebView.removeAllViews();
            x5WebView.setWebViewClient(null);
            try {
                CookieSyncManager.getInstance().stopSync();
            } catch (Exception e) {
                e.printStackTrace();
            }
            x5WebView.destroy();
            x5WebView = null;
        }
       super.onDestroy();
}

项目中用 ButterKnife 我在onDestroyView解绑定，x5WebView 会置 null，导致onDestroy 收尾工作无法正常执行，从而导致内存泄漏。 $\color{red}{（ButterKnife 老版本解绑不会置null绑定view，这样的话倒是我手贱升级负优化了。。。。）}$

    mUnbinder = ButterKnife.bind(this, view);//ButterKnife注解

    @Override
    public void onDestroyView() {
        super.onDestroyView();
      //-----------------------解绑提前了，导致内存泄漏
    }

    @Override
    public void onDetach() {
        // 移到这里解绑即可解决问题
        if (mUnbinder != null) {
            mUnbinder.unbind();
        }
        super.onDetach();
    }

生命周期如下，啧啧，多亏了debug发现xwebview意料之外变null了，不然，我还得百度，并且还查不到问题~~

2020-08-11 14:31:07.612 20841-20841/ E/:::::::::BaseWebFragment:::::::: BaseWebFragment===================>>onAttach
2020-08-11 14:31:07.612 20841-20841/ E/:::::::::BaseWebFragment:::::::: BaseWebFragment===================>>onCreate
2020-08-11 14:31:07.775 20841-20841/ E/:::::::::BaseWebFragment:::::::: BaseWebFragment===================>>onViewCreated
2020-08-11 14:31:07.775 20841-20841/ E/:::::::::BaseWebFragment:::::::: BaseWebFragment===================>>onActivityCreated
2020-08-11 14:31:07.775 20841-20841/ E/:::::::::BaseWebFragment:::::::: BaseWebFragment===================>>onStart
2020-08-11 14:31:07.778 20841-20841/ E/:::::::::BaseWebFragment:::::::: BaseWebFragment========onResume=========>程序运行时间：166毫秒
2020-08-11 14:31:07.778 20841-20841/ E/:::::::::BaseWebFragment:::::::: BaseWebFragment===================>>onResume
2020-08-11 14:31:15.307 20841-20841/ E/:::::::::BaseWebFragment:::::::: BaseWebFragment===================>>onPause
2020-08-11 14:31:15.533 20841-20841/ E/:::::::::BaseWebFragment:::::::: BaseWebFragment===================>>onStop
2020-08-11 14:31:15.536 20841-20841/ E/:::::::::BaseWebFragment:::::::: BaseWebFragment===================>>onDestroyView
2020-08-11 14:31:15.545 20841-20841/ W/System.err:     at com.sinochem.gardencrop.web.BaseWebFragment.destroyWebView(BaseWebFragment.java:235)
2020-08-11 14:31:15.545 20841-20841/ W/System.err:     at com.sinochem.gardencrop.web.BaseWebFragment.onDestroy(BaseWebFragment.java:219)
2020-08-11 14:31:15.558 20841-20841/ W/System.err:     at com.sinochem.gardencrop.web.BaseWebFragment.destroyWebView(BaseWebFragment.java:248)
2020-08-11 14:31:15.558 20841-20841/ W/System.err:     at com.sinochem.gardencrop.web.BaseWebFragment.onDestroy(BaseWebFragment.java:219)
2020-08-11 14:31:15.559 20841-20841/ E/:::::::::BaseWebFragment:::::::: BaseWebFragment===================>>onDestroy
2020-08-11 14:31:15.559 20841-20841/ E/:::::::::BaseWebFragment:::::::: BaseWebFragment===================>>onDetach

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