Android 6.0 Permission Denial: requires permission android.permission.WRITE_SETTINGS

Question

As you can see from my manifest below, I\'ve added the permission,What am I missing?

Answer 1

if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.M) {
            boolean settingsCanWrite = Settings.System.canWrite(this);

            if(!settingsCanWrite) {
                Toast.makeText(this, "Require Permission to Handle Screen Brightness", Toast.LENGTH_LONG).show();
                Intent intent = new Intent(Settings.ACTION_MANAGE_WRITE_SETTINGS);
                startActivity(intent);
            }
        }