Android异常一、异步任务导致的窗口句柄泄漏问题
先贴异常：[java]
05-05 10:36:41.009: E/WindowManager(4243): Activity com.tao.MyActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@405241b0 that was originally added here
05-05 10:36:41.009: E/WindowManager(4243): android.view.WindowLeaked: Activity com.tao.MyActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@405241b0 that was originally added here
05-05 10:36:41.009: E/WindowManager(4243): at android.view.ViewRoot.<init>(ViewRoot.java:265)
05-05 10:36:41.009: E/WindowManager(4243): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:148)
05-05 10:36:41.009: E/WindowManager(4243): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
05-05 10:36:41.009: E/WindowManager(4243): at android.view.Window$LocalWindowManager.addView(Window.java:424)
05-05 10:36:41.009: E/WindowManager(4243): at android.app.Dialog.show(Dialog.java:241)
05-05 10:36:41.009: E/WindowManager(4243): at android.app.ProgressDialog.show(ProgressDialog.java:107)
05-05 10:36:41.009: E/WindowManager(4243): at android.app.ProgressDialog.show(ProgressDialog.java:95)
05-05 10:36:41.009: E/WindowManager(4243): at com.unifable.activity.MySecretaryActivity.onCreate(MySecretaryActivity.java:50)
05-05 10:36:41.009: E/WindowManager(4243): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
05-05 10:36:41.009: E/WindowManager(4243): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
05-05 10:36:41.009: E/WindowManager(4243): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
05-05 10:36:41.009: E/WindowManager(4243): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
05-05 10:36:41.009: E/WindowManager(4243): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
05-05 10:36:41.009: E/WindowManager(4243): at android.os.Handler.dispatchMessage(Handler.java:99)
05-05 10:36:41.009: E/WindowManager(4243): at android.os.Looper.loop(Looper.java:130)
05-05 10:36:41.009: E/WindowManager(4243): at android.app.ActivityThread.main(ActivityThread.java:3683)
05-05 10:36:41.009: E/WindowManager(4243): at java.lang.reflect.Method.invokeNative(Native Method)
05-05 10:36:41.009: E/WindowManager(4243): at java.lang.reflect.Method.invoke(Method.java:507)
05-05 10:36:41.009: E/WindowManager(4243): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:906)
05-05 10:36:41.009: E/WindowManager(4243): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:664)
05-05 10:36:41.009: E/WindowManager(4243): at dalvik.system.NativeStart.main(Native Method)
这是在做一个项目的时候遇到的问题。在第一界面的Activity中，为了避免因程序假死而带来的糟糕用户体验，采用异步任务<span style="font-family:Arial, 'Liberation Sans', 'DejaVu Sans', sans-serif;border-collapse: collapse; line-height: 18px; ">AsyncTask</span>来访问网络，与服务器进行交互，并用<p><span style="white-space:pre"></span><span style="font-family:Arial, 'Liberation Sans', 'DejaVu Sans', sans-serif;border-collapse: collapse; line-height: 18px;">ProgressDialog控件来告知用户当前的程序进度。</span></p><p><span style="font-family:Arial, 'Liberation Sans', 'DejaVu Sans', sans-serif;border-collapse: collapse; line-height: 18px;">在网上查了下别人的资料，才终于明白原因。
</span></p><p><span style="font-family:Arial, 'Liberation Sans', 'DejaVu Sans', sans-serif;border-collapse: collapse; line-height: 18px; ">上面的异常的意思是</span><span style="font-family:Arial, 'Liberation Sans', 'DejaVu Sans', sans-serif;">：</span>存在窗口句柄泄露，即未能及时销毁某个PhoneWindow。</p><p>为什么会出现这样的情况，因为，在异步任务里面已经发生了严重错误，而导致Activity的强制关闭。Activity强制关闭了，可是<span style="font-family:Arial, 'Liberation Sans', 'DejaVu Sans', sans-serif;border-collapse: collapse; line-height: 18px;">ProgressDialog</span>并没有dimiss()掉，所以出现了</p><p>窗口句柄的泄漏。而且，更严重的是，这个异常会覆盖我们在<span style="font-family:Arial, 'Liberation Sans', 'DejaVu Sans', sans-serif;border-collapse: collapse; line-height: 18px; ">AsyncTask里面发生的真正异常，</span>这往往误导了我们，把过多的精力放在查找所谓的内存泄露上了，而不是查找<span style="font-family:Arial, 'Liberation Sans', 'DejaVu Sans', sans-serif;border-collapse: collapse; line-height: 18px; ">AsyncTask</span>
</p><p>中出现的情况。</p><p>
</p><p><span style="white-space:pre"></span>参照别人的解决方法：</p><p><span style="white-space: pre; "></span>本解决方法并不能真正的解决问题，但是在一定程度上可以将真正导致错误的异常信息显露出来。即重写Activity的onDestroy方法，在方法中调用dismiss来解除对<span style="font-family:Arial, 'Liberation Sans', 'DejaVu Sans', sans-serif;border-collapse: collapse; line-height: 18px; ">ProgressDialog等的引用。</span></p>
摘自 LonelyRoamer的专栏
补充：移动开发 , Android ,
