Android: How to remove files from External storage?
Its very simple:
File file = new File(YOUR_IMAGE_PATH).delete();
if(file.exists())
file.delete();
Hope it will help you.
I think you forgot to put the write permission in your AndroidManifest.xml file, that's why delete() always return false.
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />