Android 控件之RatingBar评分条

RatingBar是Adnroid中的评分条。效果挺得的

源码下载

一、概述

　　　　RatingBar是SeekBar和ProgressBar的扩展，用星星来评级。使用的默认大小RatingBar时，用户可以触摸/拖动或使用键来设置评分，它有俩种样式（大、小），其中大的只适合指示，不适合于用户交互。

二、实例

1.布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:paddingLeft="10dip"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <RatingBar android:id="@+id/ratingbar1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:numStars="3"
        android:rating="2.5" />

    <RatingBar android:id="@+id/ratingbar2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:numStars="5"
        android:rating="2.25" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dip">
       
        <TextView android:id="@+id/rating"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
           
        <RatingBar android:id="@+id/small_ratingbar"
            style="?android:attr/ratingBarStyleSmall"
            android:layout_marginLeft="5dip"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical" />
           
    </LinearLayout>

    <RatingBar android:id="@+id/indicator_ratingbar"
        style="?android:attr/ratingBarStyleIndicator"
        android:layout_marginLeft="5dip"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_vertical" />
           
</LinearLayout>

2.Java代码

package wjq.WidgetDemo;

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

public class RatingBarDemo extends Activity implements
  OnRatingBarChangeListener {
 private RatingBar mSmallRatingBar;
 private RatingBar mIndicatorRatingBar;
 private TextView mRatingText;

 /*
  * (non-Javadoc)
  *
  * @see android.app.Activity#onCreate(android.os.Bundle)
  */
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  // TODO Auto-generated method stub
  super.onCreate(savedInstanceState);
  setContentView(R.layout.ratingbarpage);
  
   mRatingText = (TextView) findViewById(R.id.rating);

         // We copy the most recently changed rating on to these indicator-only
         // rating bars
         mIndicatorRatingBar = (RatingBar) findViewById(R.id.indicator_ratingbar);
         mSmallRatingBar = (RatingBar) findViewById(R.id.small_ratingbar);
        
         // The different rating bars in the layout. Assign the listener to us.
         ((RatingBar)findViewById(R.id.ratingbar1)).setOnRatingBarChangeListener(this);
         ((RatingBar)findViewById(R.id.ratingbar2)).setOnRatingBarChangeListener(this);
 }

 @Override
 public void onRatingChanged(RatingBar ratingBar, float rating,
   boolean fromUser) {
   final int numStars = ratingBar.getNumStars();
         mRatingText.setText(
                  " 受欢迎度" + rating + "/" + numStars);

         // Since this rating bar is updated to reflect any of the other rating
         // bars, we should update it to the current values.
         if (mIndicatorRatingBar.getNumStars() != numStars) {
             mIndicatorRatingBar.setNumStars(numStars);
             mSmallRatingBar.setNumStars(numStars);
         }
         if (mIndicatorRatingBar.getRating() != rating) {
             mIndicatorRatingBar.setRating(rating);
             mSmallRatingBar.setRating(rating);
         }
         final float ratingBarStepSize = ratingBar.getStepSize();
         if (mIndicatorRatingBar.getStepSize() != ratingBarStepSize) {
             mIndicatorRatingBar.setStepSize(ratingBarStepSize);
             mSmallRatingBar.setStepSize(ratingBarStepSize);
         }

 }

}