After 2.5 years, finally I am able to finish working on the new version. This is mainly to fix the problem introduced in Android 5.0 Lollipop that empty folder will turn into file after scan.
Others changes include support of runtime permission in Android 6.0 Marshmallow and also IDE change from Eclipse to Android Studio. Well but IDE change doesn’t affect the user anyway.
You can get the latest version of the app from Google Play below.