android异常：dialog窗口句柄泄露

抛出异常：Activity ... has leaked window com.android.internal.policy.impl.PhoneWindow$... that was orifinally added here.

即：窗体已关闭，但dialog仍显示。

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异常原因：在关闭当前Activity的同时，没有及时调用dismiss来解除对dialog的引用。

解决办法：在活动跳转的同时要记得加上dialog.dismiss();