How can I check how much free space an SD card mounted on an Android device has?

Question

How can I programmatically check how much free space an SD card mounted on an Android device has?

Answer 1

Here's a simpler way, that is usable since API level 9:

Environment.getExternalStorageDirectory().getUsableSpace();

http://developer.android.com/reference/java/io/File.html#getUsableSpace()