ProgressDialog的dismiss方法与cancel方法的区别
ProgressDialog，它有两个方法dialog.cancel() 和pdialog.dismiss();?都是取消关闭ProgressDialog，但它们有什么区别吗？
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就是当使用cancel()的时候，则会同时调用你注册的DialogInterface.OnCancelListener()这个方法。以下是相关API的解释
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public void cancel ()
Since: API Level 1
Cancel the dialog. This is essentially the same as calling dismiss(), but it will also call your DialogInterface.OnCancelListener (if registered).
public void dismiss ()
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Since: API Level 1
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Dismiss this dialog, removing it from the screen. This method can be
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invoked safely from any thread. Note that you should not override this
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method to do cleanup when the dialog is dismissed, instead implement
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that in onStop().
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