问题
This is for the first time i am using external storage in android. I need some help how can i perform different operations such as how to check whether External Storage is available or not?, How to write files or pictures into storage .
回答1:
how to check whether External Storage is available or not?
Use Environment.getExternalStorageState().
How to write files or pictures into storage
Use standard Java I/O, working off a directory built using Environment.getExternalStorageDirectory().
回答2:
To clarify the first part of CommonsWare's answer (I couldn't seem to add a comment to the comment stream): you want to check that...
Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED);
... is true.
来源：https://stackoverflow.com/questions/3598445/how-can-i-use-external-storage-in-android