java.lang.IllegalArgumentException: View not attached to window manager

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最近遇到一个问题，在分屏的情况下弹出来一个ProgressDialog，在ProgressDialog还没有消失的时候，取消分屏，变成全屏，这时候就出现了crash，log如下：

--------- beginning of crash06-28 15:29:32.693  5522  5522 E AndroidRuntime: FATAL EXCEPTION: main06-28 15:29:32.693  5522  5522 E AndroidRuntime: Process: com.android.settings, PID: 552206-28 15:29:32.693  5522  5522 E AndroidRuntime: java.lang.IllegalArgumentException: View=DecorView@130e6b6[正在恢复网络设置] not attached to window manager06-28 15:29:32.693  5522  5522 E AndroidRuntime: at android.view.WindowManagerGlobal.findViewLocked(WindowManagerGlobal.java:518)06-28 15:29:32.693  5522  5522 E AndroidRuntime: at android.view.WindowManagerGlobal.removeView(WindowManagerGlobal.java:427)06-28 15:29:32.693  5522  5522 E AndroidRuntime: at android.view.WindowManagerImpl.removeViewImmediate(WindowManagerImpl.java:124)06-28 15:29:32.693  5522  5522 E AndroidRuntime: at android.app.Dialog.dismissDialog(Dialog.java:372)06-28 15:29:32.693  5522  5522 E AndroidRuntime: at android.app.Dialog.dismiss(Dialog.java:355)06-28 15:29:32.693  5522  5522 E AndroidRuntime: at com.android.settings.ResetNetWork$ResetNetTask.onPostExecute(ResetNetWork.java:237)06-28 15:29:32.693  5522  5522 E AndroidRuntime: at com.android.settings.ResetNetWork$ResetNetTask.onPostExecute(ResetNetWork.java:234)06-28 15:29:32.693  5522  5522 E AndroidRuntime: at android.os.AsyncTask.finish(AsyncTask.java:667)06-28 15:29:32.693  5522  5522 E AndroidRuntime: at android.os.AsyncTask.-wrap1(AsyncTask.java)06-28 15:29:32.693  5522  5522 E AndroidRuntime: at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:684)06-28 15:29:32.693  5522  5522 E AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:102)06-28 15:29:32.693  5522  5522 E AndroidRuntime: at android.os.Looper.loop(Looper.java:154)06-28 15:29:32.693  5522  5522 E AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:6259)06-28 15:29:32.693  5522  5522 E AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method)06-28 15:29:32.693  5522  5522 E AndroidRuntime: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:891)06-28 15:29:32.693  5522  5522 E AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:781)06-28 15:29:32.695  3130  7896 W ActivityManager:   Force finishing activity com.android.settings/.SubSettings

java.lang.IllegalArgumentException: View=DecorView@130e6b6[正在恢复网络设置] not attached to window manager，不难理解，这句话是说当前的decorview还没有附到

window上，为什么会出现这种情况呢，在网上查了一下果然有很多人遇到过这个问题，结合我这个bug的情况，原因就是在取消分屏的时候，Activity强制销毁并重新启动，但是此时
dialog还没有消失，在它消失的时候，之前它依附的Activity已经不存在了，所以才会not attached to window manager。
解决方法也很简单，在Activity销毁的时候也就是onDestory的时候把dialog dismiss就可以了。

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