RatingBar评分条是SeekBar拖动条的子类。现阶段系统自带了3种样式，我们同样用例子来演示他的使用方法和属性设置：
1、main.xml的代码：
<?xml version= 1.0encoding= 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/RatingBar01
android:layout_width= wrap_content
android:rating= 3默认分值设为3
android:layout_marginTop= 20dp
android:layout_height= wrap_content >
</RatingBar>
<RatingBar
android:id= @+id/RatingBar03
android:layout_width= wrap_content
android:numStars= 5星星数量设为5
android:rating= 4默认分值设为4
android:isIndicator= false在ratingBarStyleIndicator样式中此项默认值是TRUE，会导致不可操作
style= ?android:attr/ratingBarStyleIndicator指示器（Indicator）样式
android:layout_marginTop= 20dp
android:layout_height= wrap_content >
</RatingBar>
<RatingBar
android:id= @+id/RatingBar02
android:layout_width= wrap_content
android:isIndicator= false同上
android:numStars= 10
android:rating= 8
style= ?android:attr/ratingBarStyleSmall小星星样式
android:layout_marginTop= 20dp
android:layout_height= wrap_content >
</RatingBar>
</LinearLayout>
2、在HelloRatingBar.java的代码里我们实现了3个评分条联动的功能：
package android.basic.lesson11;
import android.app.Activity;
import android.os.Bundle;
import android.widget.RatingBar;
import android.widget.RatingBar.OnRatingBarChangeListener;
public class MainHelloRatingBar extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//定义组件对象
final RatingBar rb1 = (RatingBar)findViewById(R.id.RatingBar01);
final RatingBar rb2 = (RatingBar)findViewById(R.id.RatingBar02);
final RatingBar rb3 = (RatingBar)findViewById(R.id.RatingBar03);
//定义评分监听器
OnRatingBarChangeListener orbcl= new OnRatingBarChangeListener(){
@Override
public void onRatingChanged(RatingBar ratingBar, float rating,
boolean fromUser) {
switch(ratingBar.getId()){
case R.id.RatingBar01:
//把第一个评分条的值取出来设置给其他评分条
rb2.setRating(rb1.getRating());
rb3.setRating(rb1.getRating()*2);//十颗星所以乘以2
break;
case R.id.RatingBar02:
rb1.setRating(rb2.getRating());
rb3.setRating(rb2.getRating()*2);
break;
case R.id.RatingBar03:
rb1.setRating(rb3.getRating()/2);
rb2.setRating(rb3.getRating()/2);
break;
}
}
} ;
//绑定监听器
rb1.setOnRatingBarChangeListener(orbcl);
rb2.setOnRatingBarChangeListener(orbcl);
rb3.setOnRatingBarChangeListener(orbcl);
}
}
3、运行程序，点击评分条看看效果，使用左右键再试试
有兴趣的同学可以研究一下，如何更换评分条中的图片，譬如罢星星换成花朵什么的。
