How to migrate to Permissions in Android from an older API?

        // Example of migrating to runtime permissions in Android
        if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA)
            != PackageManager.PERMISSION_GRANTED) {
            // Permission is not granted
            if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.CAMERA)) {
                // Show an explanation to the user
                // Asynchronously proceed with the request after the user's response
            } else {
                // No explanation needed, we can request the permission
                ActivityCompat.requestPermissions(this,
                        new String[]{Manifest.permission.CAMERA},
                        MY_PERMISSIONS_REQUEST_CAMERA);
            }
        } else {
            // Permission has already been granted
            openCamera();
        }