RatingBar ratingBar = (RatingBar) findViewById(R.id.rating_bar);
        ratingBar.setEnabled(false);
        ratingBar.setRating(4);

<RatingBar
    android:id="@+id/rating_bar"
    android:saveEnabled="false"
    android:isIndicator="true"
    android:rating="0"
    style="?android:attr/ratingBarStyle"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"/>

ratingBar.setEnabled(false);