Android资源类型之Animation

Android的Resource Types说的是：保存在res/anim，res/drawable，res/color，res/layout，res/menu，res/values目录下的文件所涉及的类型。本文只讲Animation.

Animation Resources

Define pre-determined animations.
Tween animations are saved in res/anim/ and accessed from the R.anim class.
Frame animations are saved in res/drawable/ and accessed from the R.drawable class.

Color State List Resource

Define a color resources that changes based on the View state.
Saved in res/color/ and accessed from the R.color class.

Drawable Resources

Define various graphics with bitmaps or XML.
Saved in res/drawable/ and accessed from the R.drawable class.

Layout Resource

Define the layout for your application UI.
Saved in res/layout/ and accessed from the R.layout class.

Menu Resource

Define the contents of your application menus.
Saved in res/menu/ and accessed from the R.menu class.

String Resources

Define strings, string arrays, and plurals (and include string formatting and styling).
Saved in res/values/ and accessed from the R.string, R.array, and R.plurals classes.

Style Resource

Define the look and format for UI elements.
Saved in res/values/ and accessed from the R.style class.

More Resource Types

Define values such as booleans, integers, dimensions, colors, and other arrays.
Saved in res/values/ but each accessed from unique R sub-classes (such as R.bool, R.integer, R.dimen, etc.).

Animation Resources

1、分类

Animation分两类：Property Animation和View Animation。

Property Animation：通过修改一个对象的属性值来实现动画，用到的是 Animator 类。

View Animation：其又定义了两种动画框架：Tween animation和Frame animation。

    Tween Animation：针对单一图片执行各类转换操作来实现动画，用到的是Animation类。

    Frame Animation：通过一组图片按一定顺序展示来实现动画，用到的是AnimationDrawable类。

2、Animator与Animation抽象类的继承关系：

Animator        AnimatorSet        ValueAnimator                ObjectAnimator                TimeAnimator

Animation        ScaleAnimation        TranslateAnimation        AlphaAnimation        RotateAnimation        AnimationSet

3、XML属性规范

Property Animation:

文件位置：res/animator/filename.xml

资源类型： ValueAnimator, ObjectAnimator, or AnimatorSet

资源引用：In Java: R.animator.filename In XML: @[package:]animator/filename

语法：

<set  android:ordering=["together" | "sequentially"]>    <objectAnimator        android:propertyName="string"        android:duration="int"        android:valueFrom="float | int | color"        android:valueTo="float | int | color"        android:startOffset="int"        android:repeatCount="int"        android:repeatMode=["repeat" | "reverse"]        android:valueType=["intType" | "floatType"]/>    <animator        android:duration="int"        android:valueFrom="float | int | color"        android:valueTo="float | int | color"        android:startOffset="int"        android:repeatCount="int"        android:repeatMode=["repeat" | "reverse"]        android:valueType=["intType" | "floatType"]/>    <set>        ...    </set></set>

注：根节点必须为<set>, <objectAnimator>, or <animator>

<set> 代表 AnimatorSet.

<objectAnimator> 代表 ObjectAnimator.

<animator> 代表 ValueAnimator.

另，AnimatorSet调用范例（ObjectAnimator与ValueAnimator调用类似）：

AnimatorSet set = (AnimatorSet) AnimatorInflater.loadAnimator(myContext,    R.anim.property_animator);set.setTarget(myObject);set.start();

View Animation

Tween Animation:

文件位置：res/anim/filename.xml

资源类型： Animation的子类：ScaleAnimation、TranslateAnimation、AlphaAnimation、RotateAnimation or AnimationSet.

资源引用：In Java: R.anim.filename In XML: @[package:]anim/filename

语法：

<?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"] >    <alpha        android:fromAlpha="float"        android:toAlpha="float" />    <scale        android:fromXScale="float"        android:toXScale="float"        android:fromYScale="float"        android:toYScale="float"        android:pivotX="float"        android:pivotY="float" />    <translate        android:fromXDelta="float"        android:toXDelta="float"        android:fromYDelta="float"        android:toYDelta="float" />    <rotate        android:fromDegrees="float"        android:toDegrees="float"        android:pivotX="float"        android:pivotY="float" />    <set>        ...    </set></set>

注：根节点必须为<alpha>, <scale>, <translate>, <rotate>, or<set>

<alpha> 代表 AlphaAnimation.

<scale> 代表 ScaleAnimation.

<translate> 代表 TranslateAnimation.

<rotate> 代表 RotateAnimation.

<set> 代表 AnimationSet.

另，AnimationSet调用范例（其他Animation调用一致）：

ImageView image = (ImageView) findViewById(R.id.image);Animation hyperspaceJump = AnimationUtils.loadAnimation(this, R.anim.hyperspace_jump);image.startAnimation(hyperspaceJump);

系统提供的加速器：

Interpolator classResource IDAccelerateDecelerateInterpolator@android:anim/accelerate_decelerate_interpolatorAccelerateInterpolator@android:anim/accelerate_interpolatorAnticipateInterpolator@android:anim/anticipate_interpolatorAnticipateOvershootInterpolator@android:anim/anticipate_overshoot_interpolatorBounceInterpolator@android:anim/bounce_interpolatorCycleInterpolator@android:anim/cycle_interpolatorDecelerateInterpolator@android:anim/decelerate_interpolatorLinearInterpolator@android:anim/linear_interpolatorOvershootInterpolator@android:anim/overshoot_interpolator

Frame Animation

文件位置：res/drawable/filename.xml

资源类型： AnimationDrawable

资源引用：In Java: R.drawable.filename In XML: @[package:]drawable.filename

语法：

<?xml version="1.0" encoding="utf-8"?><animation-list xmlns:android="http://schemas.android.com/apk/res/android"    android:oneshot=["true" | "false"] >    <item        android:drawable="@[package:]drawable/drawable_resource_name"        android:duration="integer" /></animation-list>

调用范例：

ImageView rocketImage = (ImageView) findViewById(R.id.rocket_image);rocketImage.setBackgroundResource(R.drawable.rocket_thrust);rocketAnimation = (AnimationDrawable) rocketImage.getBackground();rocketAnimation.start();