MainActivity.java

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;    }}

 

activity_main.xml