《Android 基础（二十五）》 View Animation

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:interpolator="@[package:]anim/interpolator_resource"
    android:shareInterpolator=["true" | "false"] >//子元素是否共享这个插值器

    <!--[0.0   ,   1.0] -->
    <alpha
        android:fromAlpha="float"
        android:toAlpha="float" />

    <!--[0.0, ？] -->
    <!-- pivotX,pivotY用来控制缩放的中心点-->
    <scale
        android:fromXScale="float"
        android:toXScale="float"
        android:fromYScale="float"
        android:toYScale="float"
        android:pivotX="float"
        android:pivotY="float" />

    <!-- in pixels relative to the normal position (such as "5"), in percentage relative to the element width (such as "5%"), or in percentage relative to the parent width (such as "5%p")-->
    <translate
        android:fromXDelta="float"
        android:toXDelta="float"
        android:fromYDelta="float"
        android:toYDelta="float" />

    <!-- android:pivotX, android:pivotY n pixels relative to the object's left edge (such as "5"), in percentage relative to the object's left edge (such as "5%"), or in percentage relative to the parent container's left edge (such as "5%p") -->
    <rotate
        android:fromDegrees="float"
        android:toDegrees="float"
        android:pivotX="float"
        android:pivotY="float" />
    <set>
        ...
    </set>
</set>

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <scale
        android:duration="2000"//时常(运行代码不要在这里做注释)
        android:pivotX="50%"
        android:pivotY="50%"//缩放中心点为视图的中心
        android:fromXScale="1.0"//起点大小
        android:fromYScale="1.0"
        android:toXScale="2.0"//目标大小
        android:toYScale="2.0" />
</set>

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <alpha
        android:duration="2000"//时常
        android:fromAlpha="1.0"//起始透明度
        android:interpolator="@android:anim/accelerate_decelerate_interpolator"//插值
        android:toAlpha="0.0" />//目标透明度
</set>

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <rotate
        android:duration="2000"//时常
        android:fromDegrees="0"//起始角度
        android:interpolator="@android:anim/decelerate_interpolator"//插值
        android:pivotX="50%"
        android:pivotY="50%"//旋转中心点为视图中心
        android:toDegrees="180" />//目标角度
</set>

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <translate
        android:duration="2000"//时常
        android:fromXDelta="0"
        android:fromYDelta="0"//起始位置相对于视图的位移
        android:interpolator="@android:anim/accelerate_interpolator"
        android:toXDelta="300"
        android:toYDelta="300" />//目标位置相对于视图的位移
</set>