How to ask runtime permissions for Camera in Android , Runtime storage permissions

Question

I am doing an application to scan barcodes on a button click and it was working fine up to Lollipop versions. When I came to Marshmallow it stopped working. This is the erro

Answer 1

    if (ContextCompat.checkSelfPermission(getContext(),
            Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {

        if (ActivityCompat.shouldShowRequestPermissionRationale((Activity)
                getContext(), Manifest.permission.CAMERA)) {


        } else {
            ActivityCompat.requestPermissions((Activity) getContext(), 
                    new String[]{Manifest.permission.CAMERA},
                    MY_PERMISSIONS_REQUEST_CAMERA);
        }

    }