How to validate downloaded file present in device or not on android device?

hey guys,

I need to know how can I validate the downloaded file from app is present on android device or not ? Pls help Can you guys share links to throw some light for this?

@shashi_kumar Workaround is to use adb command

cmd : adb shell ls mnt/sdcard2/swami.txt

output if exist on sdcard : mnt/sdcard2/swami.txt
output if does not exist on sdcard : mnt/sdcard2/swami2.txt: No such file or directory