Android_动画：Interpolator

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

Demo

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