给RatingBar改图片

RatingBar是我们在系统显示分数的好组件，但是我们一般想把RatingBar装饰的更好看，想把更好看的图片用来替换系统默认的图片，系统默认的样子是这样的：

下图是个不错的选择哦：

想要实现如上效果，首先我们在styles.xml写入一个样式：

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <style name="foodRatingBar" parent="@android:style/Widget.RatingBar">
        <item name="android:progressDrawable">@drawable/food_ratingbar_full</item>
        <item name="android:minHeight">48dip</item>
        <item name="android:maxHeight">48dip</item>
    </style>
</resources>

<?xml version="1.0" encoding="utf-8"?>
<resources>
	<style name="foodRatingBar" parent="@android:style/Widget.RatingBar">
		<item name="android:progressDrawable">@drawable/food_ratingbar_full</item>
		<item name="android:minHeight">48dip</item>
  		<item name="android:maxHeight">48dip</item>
	</style>
</resources>

然后在Drawable文件夹下建food_rating_bar_full.xml文件，内容如下：

<?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/food_ratingbar_full_empty" />
    <item android:id="@+android:id/secondaryProgress"
          android:drawable="@drawable/food_ratingbar_full_empty" />
    <item android:id="@+android:id/progress"
          android:drawable="@drawable/food_ratingbar_full_filled" />
</layer-list>

<?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/food_ratingbar_full_empty" />
    <item android:id="@+android:id/secondaryProgress"
          android:drawable="@drawable/food_ratingbar_full_empty" />
    <item android:id="@+android:id/progress"
          android:drawable="@drawable/food_ratingbar_full_filled" />
</layer-list>

food_ratingbar_full_empty是代表没有选中图片效果，food_ratingbar_full_filled选中图片效果。
最后将style放入RatingBar中，即可实现你的图片效果：

<RatingBar   android:id="@+id/my_rating_bar"
            ...
            style="@style/foodRatingBar" />