how to get the file names stored in sd card in android

Question

i have a folder in sd card which contains several files. now i need to get the names of that files. can anybody have any idea how to get the file names stored in s

Answer 1

In Android 5.0 Lollipop, I found that we need add the permission to Manifest:

If not, we could not see any file in sdcard. I take an hour to find this!