解決API<8時引起的AlerDialog is not created – java.lan...

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

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

首先解釋下showDialog()和onCreateDialog直接的關係。

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

api < 8 時，showDialog(int id) ---> onCreateDialog(int id) 。此時，onCreateDialog(int)返回null將報錯，具體看代碼：
[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]

結論：
一、要使用showDialog(int id)顯示Dialog，就必須重寫onCreateDialog(int id)
二、使用showDialog(int id,Bundle b)顯示Dialog，可重寫onCreateDialog(int id,Bundle b)或onCreateDialog(int id)
三、默認onCreateDialog(int id,Bundle b)調用onCreateDialog(int id)
四、顯示Dialog時，如果不須要使用Bundle傳參數，可只重寫onCreateDialog(int id)

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

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