在编写Android程序的时候，遇到一个隐藏性问题。仔细查看LogCat，错误信息如下：

10-31 13:03:34.549: ERROR/WindowManager(444): Activity com.iqiwu.android.NoticeActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@437d1570 that was originally added here

10-31 13:03:34.549: ERROR/WindowManager(444): android.view.WindowLeaked: Activity com.iqiwu.android.NoticeActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@437d1570 that was originally
added here

10-31 13:03:34.549: ERROR/WindowManager(444): at android.view.ViewRoot.<init>(ViewRoot.java:214)

10-31 13:03:34.549: ERROR/WindowManager(444): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:148)

10-31 13:03:34.549: ERROR/WindowManager(444): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)

10-31 13:03:34.549: ERROR/WindowManager(444): at android.view.Window$LocalWindowManager.addView(Window.java:409)

10-31 13:03:34.549: ERROR/WindowManager(444): at android.app.Dialog.show(Dialog.java:238)

10-31 13:03:34.549: ERROR/WindowManager(444): at android.app.AlertDialog$Builder.show(AlertDialog.java:802)

10-31 13:03:34.549: ERROR/WindowManager(444): atcom.iqiwu.android.NoticeActivity.setAlarmNotice(NoticeActivity.java:139)

10-31 13:03:34.549: ERROR/WindowManager(444): atcom.iqiwu.android.NoticeActivity.onCreate(NoticeActivity.java:68)

10-31 13:03:34.549: ERROR/WindowManager(444): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1123)

……

从错误提示中可以看出，错误产生过程如下：NoticeActivity.onCreate -> NoticeActivity.setAlarmNotice -> AlertDialog$Builder.show，于是发现错误，在关闭Activity的时候，没有关闭AlertDialog！！！

解决方法：

我们知道，在关闭Activity的时候，Activity会调用自己的onPause函数，只要在这里关闭AlertDialog就可以啦！！！至于怎么关闭，其实很简单，调用AlertDialog.dismiss();就可以了。O(∩_∩)o
哈哈

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