Android UI设计 评分控件RatingBar用法

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<?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"
>
<TextView  android:id="@+id/tv"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text=""
/>
<RatingBar android:id="@+id/rb"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:numStars="3"
android:rating="1"
/>
<!--这里要注意了，layout_width必须是wrap_content,如果设成fill_parent，
不管你在后面把满分设为几颗星，它都会把屏幕横向显示满为止-->
</LinearLayout>

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android:numStars="3"
android:rating="1"

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package com.pocketdigi;

import android.app.Activity;
import android.os.Bundle;
import android.widget.RatingBar;
import android.widget.TextView;
import android.widget.RatingBar.OnRatingBarChangeListener;

public class main extends Activity {
/** Called when the activity is first created. */
RatingBar rb;
TextView tv;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
tv=(TextView)findViewById(R.id.tv);
rb=(RatingBar)findViewById(R.id.rb);
rb.setNumStars(5);
rb.setRating(3);
rb.setOnRatingBarChangeListener(rbLis);
//定义一个监听器
}
private OnRatingBarChangeListener rbLis=new OnRatingBarChangeListener(){

@Override
public void onRatingChanged(RatingBar ratingBar, float rating,
boolean fromUser) {
tv.setText(String.valueOf(rb.getRating()));
//输出评分
}

};
}