Activity com.avcit.conference.MainActivity has leaked window错误的理解，已解决！

Activity com.avcit.conference.MainActivity has leaked window android.widget.PopupWindow$PopupViewContainer@406dfc10 that was originally added here
android.view.WindowLeaked: Activity com.avcit.conference.MainActivity has leaked window android.widget.PopupWindow$PopupViewContainer@406dfc10 that was originally added here
at android.view.ViewRoot.<init>(ViewRoot.java:258)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:148)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
at android.view.Window$LocalWindowManager.addView(Window.java:424)
at android.widget.PopupWindow.invokePopup(PopupWindow.java:907)
at android.widget.PopupWindow.showAtLocation(PopupWindow.java:767)
at com.avcit.conference.MainActivity.alertExitDialog(MainActivity.java:352)
at com.avcit.conference.MainActivity$1.onReceive(MainActivity.java:110)
at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:709)
at android.os.Handler.handleCallback(Handler.java:587)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:130)
at android.app.ActivityThread.main(ActivityThread.java:3683)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
at dalvik.system.NativeStart.main(Native Method)

经过分析和多次的测试，发现dialog和popupwindow都会出现的，网上有好多的说这是因为dialog的没有关闭造成的，在activity.finish()之前关闭就行了，但是我这是一个特殊情况，这个dialog是在广播中打开的，调用dialog的dismiss方法是没有效果的，就是说dialog不要再广播中show();

暂时还没解决在广播中关闭dialog！！！

我的解决方法：在finish()的时候，不适用finish()方法，使用System.exit(0);的方式！可能这不是最好的方法，但是既然没有异常出现，应该就可以了！