[移动开发]PopupWindow未关闭异常

如果在activity中声明了PopupWindow，确保在关闭当前activity时候，PopupWindow已经关闭，否则会引起Window Leaked。异常如下：

E/WindowManager: android.view.WindowLeaked: Activity com.xxx.XXXActivity has leaked window android.widget.PopupWindow$PopupDecorView{8b0d12b V.E...... R....... 0,0-55,66} that was originally added here
        at android.view.ViewRootImpl.<init>(ViewRootImpl.java:733)
        at android.view.ViewRootImpl.<init>(ViewRootImpl.java:717)
        at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:399)
        at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:109)
        at android.widget.PopupWindow.invokePopup(PopupWindow.java:1576)
        at android.widget.PopupWindow.showAtLocation(PopupWindow.java:1342)
        at android.widget.PopupWindow.showAtLocation(PopupWindow.java:1308)
        at org.chromium.android_webview.PopupTouchHandleDrawable.show(chromium-TrichromeWebViewGoogle.apk-stable-410410681:18)
        at android.os.MessageQueue.nativePollOnce(Native Method)
        at android.os.MessageQueue.next(MessageQueue.java:335)
        at android.os.Looper.loop(Looper.java:183)
        at android.app.ActivityThread.main(ActivityThread.java:7656)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)

原因
Android的每一个Activity都有个WindowManager窗体管理器，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PopupWindow正在显示的时候我们去finish()了承载该PopupWindow的Activity时，就会抛Window Leaked异常了，因为这个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。

解决方法
关闭(finish)某个Activity前，要确保附属在上面的PopupWindow已经关闭(dismiss)了。如下：

if (popWindow!= null) {
    popWindow.dismiss();
}