package com.example.mars_2500_ratingbar;

import android.support.v7.app.ActionBarActivity;

import android.support.v7.app.ActionBar;

import android.support.v4.app.Fragment;

import android.app.Activity;

import android.os.Bundle;

import android.util.Log;

import android.view.LayoutInflater;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.view.View.OnClickListener;

import android.view.ViewGroup;

import android.widget.Button;

import android.widget.RatingBar;

import android.widget.RatingBar.OnRatingBarChangeListener;

import android.os.Build;

public class MainActivity extends Activity

{

    RatingBar ratingBar;

    Button button1;

    public static String TAG="MainActivity";

    @Override

    protected void onCreate(Bundle savedInstanceState)

    {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        ratingBar=(RatingBar)findViewById(R.id.ratingBar1);

        ratingBar.setOnRatingBarChangeListener(new RatingBarChangeListener());

        button1=(Button)findViewById(R.id.buttn1);

        button1.setOnClickListener(new ClickListener());

    }

    class RatingBarChangeListener implements OnRatingBarChangeListener

    {

        @Override

        public void onRatingChanged(RatingBar ratingBar, float rating,

                boolean fromUser)

        {

            Log.i(TAG, "当前分数="+rating);

            System.out.println("当前分数="+rating);

        }

    }

    class ClickListener implements OnClickListener

    {

        @Override

        public void onClick(View v)

        {    //在当前加0.5分

            ratingBar.setRating(ratingBar.getRating()+0.5f);

        }

    }

    @Override

    public boolean onCreateOptionsMenu(Menu menu)

    {

        // Inflate the menu; this adds items to the action bar if it is present.

        getMenuInflater().inflate(R.menu.main, menu);

        return true;

    }

}

<?xml version="1.0" encoding="UTF-8"?>

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

         android:orientation="vertical"

         android:layout_width="fill_parent"

         android:layout_height="fill_parent"

         >

<RatingBar

        android:id="@+id/ratingBar1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:numStars=""

        android:stepSize="0.5"

        />

    <Button

        android:id="@+id/buttn1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_below="@id/ratingBar1"

        android:text="评分"

         />

 </LinearLayout>