一、RatingBar几个常用属性

• numStars:星的总数量
• stepSize:变化的步长
• isIndicator:false:允许拖动改变评分条 true:不允许通过拖动改变评分条
• rating:初始的星数量

要想RatingBar显示设置的星总数，它的layout_width必须设置为wrap_content

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
      xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:tools="http://schemas.android.com/tools"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      tools:context="cn.ucai.day05_12_02_style.RatingbarActivity">
      <RatingBar
          android:id="@+id/ratingBar"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:numStars="5"
          android:isIndicator="false"
          android:rating="3"
          android:stepSize="0.5"/>
</RelativeLayout>

星的总数为5，初次显示3颗星，效果图

RatingBar.png

RatingBar监听事件RatingBar.OnRatingBarChangeListener

RatingBar bar= (RatingBar)findViewById(R.id.ratingBar);
bar.setOnRatingBarChangeListener(new RatingBar.OnRatingBarChangeListener()
 {
    @Override
    public void onRatingChanged(RatingBar ratingBar, float v, boolean b) {
        if(b){
           Toast.makeText(RatingbarActivity.this,"拖动星星数量"+v,Toast.LENGTH_SHORT).show();        
}
}});

二、自定义RatingBar几个常用属性

自定义RatingBar关键在于使用标签<layer-list/>以将多个图片按照顺序层叠起来。
分别设置固定id属性为@android:id/background和进度@android:id/progress

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:id="@android:id/background"
        android:drawable="@drawable/star_unselected"/>
    <item
        android:id="@android:id/progress"
        android:drawable="@drawable/star_selected"/>
</layer-list>

效果图

自定义RatingBar.png