Activity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView

今天程式在樂phone上測出來一個bug：

從頁面內退出程式時候第一次退不出去，需要第二次推出才可以。

在DDMS上跟蹤發現報兩個錯誤：

08-19 13:51:18.286: ERROR/AndroidRuntime(5765): java.lang.SecurityException: Permission Denial: starting Intent { act=android.intent.action.MAIN cat=[android.intent.category.HOME] flg=0x10000000 cmp=com.android.launcher/.Launcher} 
from ProcessRecord{302a32c0 5765:com.up591.android/10087} 
(pid=5765, uid=10087) requires android.permission.REORDER_TASKS
08-19 14:16:04.576: ERROR/AndroidRuntime(6302): java.lang.SecurityException: 
Permission Denial: starting Intent { act=android.intent.action.MAIN cat=[android.intent.category.HOME]
flg=0x10000000 cmp=com.android.launcher/.Launcher } from ProcessRecord{2ffee120 6302:com.up591.android/10087}
(pid=6302, uid=10087) requires android.permission.REORDER_TASKS

以及

08-19 14:17:13.446: ERROR/WindowManager(6428): Activity com.up591.android.view.MainActivity has leaked 
window com.android.internal.policy.impl.PhoneWindow$DecorView@2fd590c8 that was originally added here
08-19 14:17:13.446: ERROR/WindowManager(6428): android.view.WindowLeaked: Activity com.up591.android.view.
MainActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@2fd590c8 that 
was originally added here
08-19 14:17:13.446: ERROR/WindowManager(6428):     at android.view.ViewRoot.<init>(ViewRoot.java:247)
08-19 14:17:13.446: ERROR/WindowManager(6428):     at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:148)
08-19 14:17:13.446: ERROR/WindowManager(6428):     at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
08-19 14:17:13.446: ERROR/WindowManager(6428):     at android.view.Window$LocalWindowManager.addView(Window.java:444)
08-19 14:17:13.446: ERROR/WindowManager(6428):     at android.app.Dialog.show(Dialog.java:248)
08-19 14:17:13.446: ERROR/WindowManager(6428):     at com.up591.android.asyncTasks.NetworkTask.onPreExecute(NetworkTask.java:51)
08-19 14:17:13.446: ERROR/WindowManager(6428):     at com.up591.android.asyncTasks.GetRootCatalogTask.onPreExecute(GetRootCatalogTask.java:38)
08-19 14:17:13.446: ERROR/WindowManager(6428):     at android.os.AsyncTask.execute(AsyncTask.java:391)
08-19 14:17:13.446: ERROR/WindowManager(6428):     at com.up591.android.view.PractiseActivity.getList(PractiseActivity.java:221)
08-19 14:17:13.446: ERROR/WindowManager(6428):     at com.up591.android.view.PractiseActivity.onAfterCreate(PractiseActivity.java:79)
08-19 14:17:13.446: ERROR/WindowManager(6428):     at com.up591.android.common.BaseActivity.onCreate(BaseActivity.java:122)
08-19 14:17:13.446: ERROR/WindowManager(6428):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
08-19 14:17:13.446: ERROR/WindowManager(6428):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2658)
08-19 14:17:13.446: ERROR/WindowManager(6428):     at android.app.ActivityThread.startActivityNow(ActivityThread.java:2534)
08-19 14:17:13.446: ERROR/WindowManager(6428):     at android.app.LocalActivityManager.moveToState(LocalActivityManager.java:127)
08-19 14:17:13.446: ERROR/WindowManager(6428):     at android.app.LocalActivityManager.startActivity(LocalActivityManager.java:339)
08-19 14:17:13.446: ERROR/WindowManager(6428):     at android.widget.TabHost$IntentContentStrategy.getContentView(TabHost.java:692)
08-19 14:17:13.446: ERROR/WindowManager(6428):     at android.widget.TabHost.setCurrentTab(TabHost.java:354)
08-19 14:17:13.446: ERROR/WindowManager(6428):     at android.widget.TabHost.addTab(TabHost.java:230)
08-19 14:17:13.446: ERROR/WindowManager(6428):     at com.up591.android.view.MainActivity.onCreate(MainActivity.java:51)
08-19 14:17:13.446: ERROR/WindowManager(6428):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
08-19 14:17:13.446: ERROR/WindowManager(6428):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2658)
08-19 14:17:13.446: ERROR/WindowManager(6428):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2710)
08-19 14:17:13.446: ERROR/WindowManager(6428):     at android.app.ActivityThread.access$2300(ActivityThread.java:131)
08-19 14:17:13.446: ERROR/WindowManager(6428):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2049)
08-19 14:17:13.446: ERROR/WindowManager(6428):     at android.os.Handler.dispatchMessage(Handler.java:99)
08-19 14:17:13.446: ERROR/WindowManager(6428):     at android.os.Looper.loop(Looper.java:123)
08-19 14:17:13.446: ERROR/WindowManager(6428):     at android.app.ActivityThread.main(ActivityThread.java:4737)
08-19 14:17:13.446: ERROR/WindowManager(6428):     at java.lang.reflect.Method.invokeNative(Native Method)
08-19 14:17:13.446: ERROR/WindowManager(6428):     at java.lang.reflect.Method.invoke(Method.java:521)
08-19 14:17:13.446: ERROR/WindowManager(6428):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:876)
08-19 14:17:13.446: ERROR/WindowManager(6428):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:634)
08-19 14:17:13.446: ERROR/WindowManager(6428):     at dalvik.system.NativeStart.main(Native Method)

大概的意思是：第一個是說系統沒有改變Z軸排列任務的許可權

第二個是說  表單泄露錯誤

在Google後發現。表單泄露的原因是有些dialog或則processDialog等引起的。這些空間依附的Activity已經關閉而這些控制項還在運行中。所以導致bug

典型的場合是activity 和dialog同時顯示 要先dialog.dismiss() 後activity.finish() 如果直接finish() 會出錯 但不影響功能。

解決的辦法是通過加入android.permission.REORDER_TASKS    許可權解決

目前還不知道是不是因為沒有許可權所以導致樂phone不能夠很好的釋放頁面資源。有待進一步研討