Changing System File Permission

I've really tried everything: NetHackFileHelpers How to get File Permission Mode programmatically in Java Change file permission in application Mount R/W system in android applica

Solution 1:

Here is my solution:

        Process sh = Runtime.getRuntime().exec("su", null, new File("/system/bin/"));
        OutputStream os = sh.getOutputStream();

        os.write(("chmod 777 <filepath>").getBytes("ASCII"));
        os.flush();
        os.close();
        sh.waitFor();