Android異常一、異步任務導致的窗口句柄泄漏問題 --- 轉
先貼異常:
[java] view plaincopy
- 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)
- 這是在做一個項目的時候遇到的問題:在第一界面的Activity中,為了避免程序假死帶來的糟糕的用戶體驗,采用異步任務AsyncTask來訪問網絡,與服務器進行交互,并用
- ProgressDialog控件來告知用戶當前的程序進度。
- 在網上查了下別人的資料。才終于明白了原因。
- 上面的異常的意思是:存在窗口句柄的泄漏,即未能及時的銷毀某個PhoneWindow.
- 為什么會出現這樣的情況,因為,在異步任務里面已經發生了嚴重的錯誤,而導致Activity的強制關閉。Activity強制關閉了,可是ProgressDialog并沒有dismiss()掉,所以出現了
- 窗口句柄的泄漏。 而且,更嚴重的是,這個異常會覆蓋我們在AsyncTask里面發生的真正異常,這往往會誤導我們,把過多的精力放在查找所謂的內存泄漏的上面,而不是查找AsyncTask
- 中出現的錯誤。
- 參照別人的解決方法:
- 本解決方法并不能真正的解決問題,但是在一定程度上可以將真正導致錯誤的異常信息顯露出來。即重寫Activity的onDestory()方法,在該方法中調用dismiss()來解除對ProgressDialog
- 的引用。