关于android.view.WindowLeaked(窗体泄露)的解决方案

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虽然是小问题一个，但也困扰了我一段时间，现在记下来，给自己做个备忘，也可以给其他人一个参考

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01-08 01:49:27.874: ERROR/WindowManager(473): Activity com.photos.MainActivity has leaked window android.widget.ImageButton@43e40d10 that was originally added here  
01-08 01:49:27.874: ERROR/WindowManager(473): android.view.WindowLeaked: Activity com.photos.MainActivity has leaked window android.widget.ImageButton@43e40d10 that was originally added here  
01-08 01:49:27.874: ERROR/WindowManager(473):     at android.view.ViewRoot.(ViewRoot.java:247)  
01-08 01:49:27.874: ERROR/WindowManager(473):     at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:148)  
01-08 01:49:27.874: ERROR/WindowManager(473):     at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)  
01-08 01:49:27.874: ERROR/WindowManager(473):     at android.view.Window$LocalWindowManager.addView(Window.java:424)  
01-08 01:49:27.874: ERROR/WindowManager(473):     at android.widget.PopupWindow.invokePopup(PopupWindow.java:828)  
01-08 01:49:27.874: ERROR/WindowManager(473):     at android.widget.PopupWindow.showAtLocation(PopupWindow.java:688)  
01-08 01:49:27.874: ERROR/WindowManager(473):     at com.photos.MainActivity.showCommonPopup(MainActivity.java:256)  
01-08 01:49:27.874: ERROR/WindowManager(473):     at com.photos.MainActivity.access$3(MainActivity.java:255)  
01-08 01:49:27.874: ERROR/WindowManager(473):     at com.photos.MainActivity$2.handleMessage(MainActivity.java:88)  
01-08 01:49:27.874: ERROR/WindowManager(473):     at android.os.Handler.dispatchMessage(Handler.java:99)  
01-08 01:49:27.874: ERROR/WindowManager(473):     at android.os.Looper.loop(Looper.java:123)  
01-08 01:49:27.874: ERROR/WindowManager(473):     at android.app.ActivityThread.main(ActivityThread.java:4627)  
01-08 01:49:27.874: ERROR/WindowManager(473):     at java.lang.reflect.Method.invokeNative(Native Method)  
01-08 01:49:27.874: ERROR/WindowManager(473):     at java.lang.reflect.Method.invoke(Method.java:521)  
01-08 01:49:27.874: ERROR/WindowManager(473):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)  
01-08 01:49:27.874: ERROR/WindowManager(473):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)  
01-08 01:49:27.874: ERROR/WindowManager(473):     at dalvik.system.NativeStart.main(Native Method)  
 

按字面了解，Window Leaked大概就是说一个窗体泄漏了，也就是我们常说的内存泄漏，为什么窗体会泄漏呢？

产生原因：
我们知道Android的每一个Activity都有个WindowManager窗体管理器，同样，构建在某个Activity之上的对话框、PopupWindow也有相应的WindowManager窗体管理器。因为对话框、PopupWindown不能脱离Activity而单独存在着，所以当某个Dialog或者某个PopupWindow正在显示的时候我们去finish()了承载该Dialog(或PopupWindow)的Activity时，就会抛Window Leaked异常了，因为这个Dialog(或PopupWindow)的WindowManager已经没有谁可以附属了，所以它的窗体管理器已经泄漏了。

android.view.WindowLeaked一般会发生在Activity 与Dialog的显示。

       Activity 中create 一个Dialog，若你先关闭Dialog再关闭Activity就是正常的，若你先关闭Activity再关闭Dialog就会报错这个android.view.WindowLeaked错误了。
       分析这个原因是：Dialog是基于Activity而创建的：new ProgressDialog(this)；this 就是Activity。 Activtity先finish,那Dialog就没得依附了，所以就会报android.view.WindowLeaked。




解决方法：
关闭(finish)某个Activity前，要确保附属在上面的Dialog或PopupWindow已经关闭(dismiss)了。
   也可在OnCreateDialog()中创建Dialog，让系统去管理对话框