Change file permissions programmatically

Question

I have a method that copies a png file, but the file is created with permissions set to read only by owner. I want to change the permissions to 777. I'm not getting any errors, but the file permissions aren't changed.

private void SaveImage(Bitmap finalBitmap){
    String root = Environment.getExternalStorageDirectory().toString();
    File myDir = new File(root + "/Movies");
    String fname = desc +".mkv";
    File file = new File (myDir, fname);
    String chmod_path = (root + "/" +  fname);
    final File ch_file = new File(chmod_path);
    try {
        FileOutputStream out = new FileOutputStream(file);
        finalBitmap.compress(Bitmap.CompressFormat.PNG, 90, out);
        out.flush();
        out.close();
        ch_file.setReadable(true, false);
        ch_file.setExecutable(true, false);
        ch_file.setWritable(true, false);
    } catch (Exception e) {
        e.printStackTrace();
    }

}

Possible duplicate of [How do i programmatically change file permissions?](http://stackoverflow.com/questions/664432/how-do-i-programmatically-change-file-permissions) — coletrain, Feb 07 '17 at 16:47
@HopefullyHelpful The png file that is copied is used to "trick" plex into thinking its a video, but it doesn't work unless the permissions are at least read/execute by anyone. — user2631279, Feb 07 '17 at 16:50
Files don't need to be executable unless they are actual scripts. — OneCricketeer, Feb 07 '17 at 16:52
@cricket_007 "The user account needs to have at least read and execute permission for the directories and content."- Plex Website — user2631279, Feb 07 '17 at 16:53
Anyways, you only need execute on the directory in order to list the contents. Execute does nothing on a file unless it's actually runnable — OneCricketeer, Feb 07 '17 at 16:56
@cricket_007 No. I'm using the barcode scanner tool on my phone to get the name of the blu-ray. Then I'm making a "fake" video file with the same name. I then will copy all of those files and put them on my desktop for plex to scan. — user2631279, Feb 07 '17 at 16:57
Okay, then why do you think changing the file permissions on your Android device will affect the permissions on your server? — OneCricketeer, Feb 07 '17 at 16:58

Change file permissions programmatically

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