解决API<8时引起的AlerDialog is not created – java.lan...

解决API<8时引起的AlerDialog is not created - java.lang.IllegalArgumentException: Activity#onCreateDialog did not create a dialog for id 1

报错：java.lang.IllegalArgumentException: Activity#onCreateDialog did not create a dialog for id 4

首先解释下showDialog()和onCreateDialog直接的关系。

api >= 8 时, showDialog(int id,Bundle b) --> onCreateDialog(int id,Bundle b)

api < 8 时，showDialog(int id) ---> onCreateDialog(int id) 。此时，onCreateDialog(int)返回null将报错，具体看代码：
[url]http://grepcode.com/file/repository.grepcode.com/java/ext/com.google.android/android/2.1_r2/android/app/Activity.java#Activity.showDialog%28int%29[/url]

结论：
一、要使用showDialog(int id)显示Dialog，就必须重写onCreateDialog(int id)
二、使用showDialog(int id,Bundle b)显示Dialog，可重写onCreateDialog(int id,Bundle b)或onCreateDialog(int id)
三、默认onCreateDialog(int id,Bundle b)调用onCreateDialog(int id)
四、显示Dialog时，如果不须要使用Bundle传参数，可只重写onCreateDialog(int id)

其它参考：
[url]http://stackoverflow.com/questions/4225526/android-runtimeexception-oncreatedialog-did-not-create-a-dialog-for-id[/url] 

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