Xml实现图片旋转

1. 需求：不使用Java代码，实现旋转图片动画

2.实现：使用Progressbar控件

3. anim/anim_loading.xml

<?xml version="1.0" encoding="utf-8"?>
<rotate xmlns:android="http://schemas.android.com/apk/res/android"
    android:drawable="@drawable/loading"
    android:pivotX="50.0%"
    android:pivotY="50.0%"/>

<!-- 修改转动速率-->
<?xml version="1.0" encoding="utf-8"?>
<rotate xmlns:android="http://schemas.android.com/apk/res/android"
    android:drawable="@drawable/loading"
    android:fromDegrees="-720"
    android:duration="400"
    android:toDegrees="0"
    android:pivotX="50.0%"
    android:pivotY="50.0%"/>

4.values/styles.xml加入

 <!-- loading 动画-->
    <style name="progressbar_style">
        <item name="android:maxWidth">50.0dip</item>
        <item name="android:maxHeight">50.0dip</item>
        <item name="android:indeterminateDrawable">@anim/anim_loading</item>
        <item name="android:minWidth">50.0dip</item>
        <item name="android:minHeight">50.0dip</item>
    </style>

5.layout

 <ProgressBar
            android:layout_width="200dp"
            android:layout_height="200dp"
            style="@style/progressbar_style"/>