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, "當(dāng)前分?jǐn)?shù)="+rating);      System.out.println("當(dāng)前分?jǐn)?shù)="+rating);    }  }    class ClickListener implements OnClickListener  {    @Override    public void onClick(View v)    {  //在當(dāng)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="5"    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="評(píng)分"     /> </LinearLayout>