You could set the rating to isIndicator after the user makes his first change
You should prompt the user to make sure his change is exactly as he wished. It can get pretty difficult to rate when the property stepSize (how precise the rating is) is 0.5
//You could prompt the user using a dialog to confirm he is done rating
ratingBar.setIsIndicator(true);
That should leave the UI unchanged(no greyish blur) and prevent the user from making a change (just like setEnabled(false))
In XML Layout
android:isIndicator="true"
Hope it helped