Android学习之RatingBar评分组件

main.xml:

 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:id="@+id/MyLayout"
  android:orientation="vertical"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent">
  <RatingBar
    android:numStars="5"
    android:stepSize="0.5"
    android:isIndicator="false"
    android:id="@+id/ratingbarA"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"/>
  <RatingBar
    android:numStars="5"
    android:rating="3"
    android:isIndicator="true"
    android:id="@+id/ratingbarB"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"/>
  <TextView
    android:id="@+id/text"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"/>
</LinearLayout>

 

 

MyRatingBarDemo.java:

 

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

public class MyRatingBarDemo extends Activity {
  private RatingBar ratingBarA = null;          // 定义评分组件
  private TextView text = null;               // 文本显示组件

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    super.setContentView(R.layout.main);
    this.ratingBarA = (RatingBar) super.findViewById(R.id.ratingbarA) ;
    this.text = (TextView) super.findViewById(R.id.text) ;// 取得组件
    this.ratingBarA.setOnRatingBarChangeListener(
        new OnRatingBarChangeListenerImpl());   // 设置监听
  }

  private class OnRatingBarChangeListenerImpl implements
      RatingBar.OnRatingBarChangeListener {
    @Override
    public void onRatingChanged(RatingBar ratingBar, float rating,
        boolean fromUser) {
      MyRatingBarDemo.this.text.append("*** 当前值（Rating）："
          + ratingBar.getRating() + "，增长步长："
          + ratingBar.getStepSize() + "\n");    // 增加文本显示
    }
  } 
}