Image and videos unreadable after move in Android

Question

I'm using this functions to move some images and videos to custom folders:

public static void moveFile(File src, File dst) throws IOException {
    FileChannel inChannel = new FileInputStream(src).getChannel();
    FileChannel outChannel = new FileOutputStream(dst).getChannel();
    try {
        inChannel.transferTo(0, inChannel.size(), outChannel);
    } finally {
        if (inChannel != null)
            inChannel.close();
        if (outChannel != null)
            outChannel.close();
    }
    dst.setExecutable(true);
    dst.setReadable(true);
    src.delete();
}

The files are moved correctly and the src files got deleted fine. The problem is that when I try to open the image or video with any gallery it shows black or impossible to play video. So I checked with file manager and saw that files' permissions are wrong. Have you got any suggestions?

Thanks.