Android_动画：Interpolator

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效果图

2种创建方式

Interpolator有2种创建方式，一种用xml创建，一种用java创建。

OvershootInterpolator overshoot = new OvershootInterpolator(1.0f);
OvershootInterpolator interpolator = (OvershootInterpolator) AnimationUtils.loadInterpolator(MainActivity.this, android.R.interpolator.overshoot);不强制转化，用Interpolator也可以
Interpolator interpolator =AnimationUtils.loadInterpolator(MainActivity.this, android.R.interpolator.overshoot);

注意：Interpolator是包android.view.animation下

import android.view.animation.Interpolator;

xml创建

private boolean flag = true;

Interpolator interpolator = AnimationUtils.loadInterpolator(MainActivity.this, android.R.interpolator.bounce);Path path1 = new Path();
path1.moveTo(1.0f, 1.0f);
path1.lineTo(0.2f, 0.2f);ObjectAnimator objectAnimator = ObjectAnimator.ofFloat(view, View.SCALE_X, View.SCALE_Y, path);
objectAnimator.setDuration(2000);
objectAnimator.setInterpolator(interpolator);
objectAnimator.start();

TranslationX、scaleX都是常量

常量	值
View.TRANSLATION_X	translationX
View.TRANSLATION_Y	translationY
View.TRANSLATION_Z
View.SCALE_X	translationZ
View.SCALE_Y	scaleX
View.ALPHA	scaleY
View.ROTATION	alpha
View.ROTATION_X	rotationX
View.ROTATION_Y	rotationY

xml的interpolator有多种类型

java创建

BounceInterpolator interpolator2 = new BounceInterpolator();
ObjectAnimator objectAnimatorX = ObjectAnimator.ofFloat(view, View.SCALE_X, 0.2f, 1.0f);
ObjectAnimator objectAnimatorY = ObjectAnimator.ofFloat(view, View.SCALE_Y, 0.2f, 1.0f);AnimatorSet set = new AnimatorSet();
set.playTogether(objectAnimatorX,objectAnimatorY);
set.setInterpolator(interpolator2);
set.setDuration(2000);
set.start();

Interpolator是interface，它有很多实现的子类

AccelerateDecelerateInterpolator,
AccelerateInterpolator,
AnticipateInterpolator,
AnticipateOvershootInterpolator,
BaseInterpolator,
BounceInterpolator,
CycleInterpolator,
DecelerateInterpolator,
FastOutLinearInInterpolator,
FastOutSlowInInterpolator,
LinearInterpolator,
LinearOutSlowInInterpolator,
OvershootInterpolator,
PathInterpolator

注意

使用path需要API>=21

ObjectAnimator.ofFloat(view, View.SCALE_X, View.SCALE_Y, path);//API>=21
ObjectAnimator.ofFloat(view,View.SCALE_X,0.2f,1.0f);

Demo

http://git.oschina.net/AnimationDemo/interpolator01

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