android com.google.android.videos ANR

来源：互联网发布：sra数据上传编辑：程序博客网时间：2024/06/13 19:54

发生ANR的时候这个进程(com.google.android.videos)的主线程stack如下:

"main" prio=5 tid=1 Native......at android.os.BinderProxy.transactNative(Native method)  at android.os.BinderProxy.transact(Binder.java:503)  at com.android.vending.contentfilters.IContentFiltersService$Stub$Proxy.getContentFiltersAndIntent(SourceFile:138)  at com.google.android.videos.contentfiltering.ContentFiltersManager.saveContentFiltersToPreference(SourceFile:438)  at com.google.android.videos.contentfiltering.ContentFiltersManager.access$100(SourceFile:81)  at com.google.android.videos.contentfiltering.ContentFiltersManager$1.onServiceConnected(SourceFile:423)  at android.app.LoadedApk$ServiceDispatcher.doConnected(LoadedApk.java:1223)  at android.app.LoadedApk$ServiceDispatcher$RunConnection.run(LoadedApk.java:1240)  at android.os.Handler.handleCallback(Handler.java:739)  at android.os.Handler.dispatchMessage(Handler.java:95)  at android.os.Looper.loop(Looper.java:148)  at android.app.ActivityThread.main(ActivityThread.java:5446)......

阻塞在binder调用中，因此需要继续看binder服务端为什么没有及时返回。这个对应的binder服务端是进程com.android.vending。

此时com.android.vending对应的binder线程的堆栈如下：

Cmd line: com.android.vending"Binder_2" prio=5 tid=8 Waitingheld mutexes=at java.lang.Object.wait!(Native method)    waiting on <0x0ee7a0e1> (a com.android.volley.toolbox.RequestFuture)    at java.lang.Object.wait(Object.java:423)    at com.android.volley.toolbox.RequestFuture.doGet(RequestFuture.java:111)    locked <0x0ee7a0e1> (a com.android.volley.toolbox.RequestFuture)    at com.android.volley.toolbox.RequestFuture.get(RequestFuture.java:88)    at com.google.android.finsky.api.model.DfeContentFilters.fetchOverNetwork$6f1d50b6(DfeContentFilters.java:54)    at com.google.android.finsky.services.ContentFiltersService$1.getContentFiltersAndIntent(ContentFiltersService.java:69)    at com.android.vending.contentfilters.IContentFiltersService$Stub.onTransact(IContentFiltersService.java:50)    at android.os.Binder.execTransact(Binder.java:453)

通过反编译com.android.vending代码，看到binder服务端代码如下：

public class ContentFiltersService extends Service {......private final IContentFiltersService.Stub mBinder = new IContentFiltersService.Stub() {public final Bundle getContentFiltersAndIntent(                          ......                          DfeContentFilters localDfeContentFilters = new DfeContentFilters(localFinskyApp.getDfeApi(null),ContentFiltersService.this);  boolean bool = localDfeContentFilters.isCacheStale(); ......if (bool)localContentFilterSettingsResponse = localDfeContentFilters.fetchOverNetwork$6f1d50b6();                         ......               }......}

这里在if(bool)成立时会执行DfeContentFilters对象localDfeContentFilters的fetchOverNetwork$6f2d50b6方法。从stack信息看这个方法继续调用到RequestFuture.doGet.

RequestFuture.doGet代码:

100     private synchronized T doGet(Long timeoutMs)101             throws InterruptedException, ExecutionException, TimeoutException {102         if (mException != null) {103             throw new ExecutionException(mException);104         }105 106         if (mResultReceived) {107             return mResult;108         }109 110         if (timeoutMs == null) {111             wait(0);112         } else if (timeoutMs > 0) {113             wait(timeoutMs);114         }115 116         if (mException != null) {117             throw new ExecutionException(mException);118         }119 120         if (!mResultReceived) {121             throw new TimeoutException();122         }123 124         return mResult;125     }

这里如果网络有问题就会导致等待超时最终导致binder调用时间过长，调用的app:com.google.android.videos主线程ANR.

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