评分组件（RatingBar）

1.  RatingBarDemo.java

public class RatingBarDemo extends AppCompatActivity {
    private RatingBar ratingBarA = null;
    private TextView textView = null;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_rating_bar_demo);
        this.ratingBarA = (RatingBar)findViewById(R.id.ratingBar1);  //取得组件
        this.textView = (TextView)super.findViewById(R.id.text);
        this.ratingBarA.setOnRatingBarChangeListener(new OnRatingBarChangeListenerImpl()); //设置监听
    }
    private class OnRatingBarChangeListenerImpl implements RatingBar.OnRatingBarChangeListener {
        @Override
        public void onRatingChanged(RatingBar ratingBar, float rating, boolean fromUser) {
            RatingBarDemo.this.textView.append("**当前值："+ratingBar.getRating()+
            ",增长步长："+ratingBar.getStepSize()+"\n");  //增加文本
        }
    }
}

2.  activity_rating_bar_demo.xml

<!--有5星评分，每次评分步长0.5，用户可以操作-->
<RatingBar
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/ratingBarB"
    android:numStars="5"
    android:stepSize="0.5"
    android:isIndicator="false"
    android:layout_centerHorizontal="true" />

<!--默认3颗星-->
<RatingBar
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:rating="3"
    android:id="@+id/ratingBar1"
    android:layout_alignParentTop="true"
    android:layout_alignLeft="@+id/ratingBarB"
    android:layout_alignStart="@+id/ratingBarB"
    android:layout_marginTop="63dp"
    android:numStars="5"
    android:stepSize="0.5" />
<TextView
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:id="@+id/text"
    android:layout_below="@+id/ratingBar1"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:layout_marginTop="52dp" />