<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

     xmlns:tools="http://schemas.android.com/tools"

     android:layout_width="match_parent"

     android:layout_height="match_parent"

     tools:context="${relativePackage}.${activityClass}" >

     <RatingBar

         android:id="@+id/rb"

         android:layout_width="wrap_content"

         android:layout_height="30dp"

         android:layout_marginLeft="20dp"

         android:layout_marginTop="20dp"

         android:numStars="5"

         android:progressDrawable="@drawable/rating_star"

         android:stepSize="0.5" /> <!-- 自定义ratingbar样式 -->

     <TextView

         android:id="@+id/tv_num"

         android:layout_width="wrap_content"

         android:layout_height="wrap_content"

         android:layout_below="@+id/rb"

         android:layout_marginLeft="20dp"

         android:layout_marginTop="20dp"

         android:text="当前评分是：" />

     <TextView

         android:id="@+id/tv"

         android:layout_width="wrap_content"

         android:layout_height="wrap_content"

         android:layout_below="@+id/rb"

         android:layout_marginTop="20dp"

         android:layout_toRightOf="@id/tv_num"

         android:text="0.0"

         android:textColor="#FF0000" />

 </RelativeLayout>

 package com.example.ratingbar;

 import android.app.Activity;

 import android.os.Bundle;

 import android.view.Menu;

 import android.view.MenuItem;

 import android.view.View;

 import android.widget.RatingBar;

 import android.widget.RatingBar.OnRatingBarChangeListener;

 import android.widget.TextView;

 public class MainActivity extends Activity {

     private TextView tv;

     private RatingBar rb;

     @Override

     protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.activity_main);

         //找到控件

         tv = (TextView) findViewById(R.id.tv);

         rb = (RatingBar) findViewById(R.id.rb);

         rb.setOnRatingBarChangeListener(new OnRatingBarChangeListener() {//设置ratingbar监听器

             @Override

             public void onRatingChanged(RatingBar ratingBar, float rating, boolean fromUser) {

                 if(fromUser){//如果是用户操作

                     tv.setText(Float.toString(rating));//显示分数

                 }

             }

         });

     }

 }