<?xml version="1.0" encoding="utf-8"?> 
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" 
  xmlns:app="http://schemas.android.com/apk/res-auto" 
  xmlns:tools="http://schemas.android.com/tools" 
  android:layout_width="match_parent" 
  android:layout_height="match_parent" 
  tools:context="com.amy.ratingbartest.MainActivity"> 
 
  <LinearLayout 
    android:orientation="vertical" 
    android:layout_width="0dp" 
    android:layout_height="wrap_content" 
    tools:layout_editor_absoluteY="0dp" 
    tools:layout_editor_absoluteX="8dp"> 
    <!-- 星级评分条 --> 
    <RatingBar 
      android:id="@+id/ratingBar1" 
      android:numStars="5" 
      android:rating="2.5" 
      android:isIndicator="false" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" /> 
 
    <!-- 按钮 --> 
    <Button 
      android:id="@+id/button1" 
      android:text="提交" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" /> 
 
  </LinearLayout> 
 
</android.support.constraint.ConstraintLayout> 

package com.amy.ratingbartest; 
 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.View; 
import android.widget.Button; 
import android.widget.RatingBar; 
import android.widget.Toast; 
 
public class MainActivity extends AppCompatActivity { 
 
  private RatingBar ratingBar;//星级评分条 
  @Override 
  protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    ratingBar = (RatingBar) findViewById(R.id.ratingBar1); 
    Button button = (Button) findViewById(R.id.button1); 
    button.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
        /** 
         * getRating():用于获取等级，表示选中的几颗星 
         * getStepSize():用语获取每次至少要改变多少个星级 
         * getProgress():用语获取进度，获取到的进度值为getRating()方法返回值与getStepSize()方法返回值之积 
         */ 
        int result = ratingBar.getProgress(); 
        float rating = ratingBar.getRating(); 
        float step = ratingBar.getStepSize(); 
        Log.e("星级评分条","step="+step+"result="+result+"rating="+rating); 
        Toast.makeText(MainActivity.this,"你得到了"+rating+"颗星",Toast.LENGTH_SHORT).show(); 
      } 
    }); 
  } 
}