Android动画之属性动画

概述一、前言属性动画可以实现补间动画的所有效果，且还能实现补间动画实现不了的效果，接下来就来学习一下属性动画。二、ValueAnimator的使用//创建一个从1到100的整型动画//获取屏幕宽度intwidthPixels=getResources().getDisplayMetrics().widthPixels; 一、前言

属性动画可以实现补间动画的所有效果，且还能实现补间动画实现不了的效果，接下来就来学习一下属性动画。

二、ValueAnimator的使用

 //创建一个从1到100的整型动画        //获取屏幕宽度        int wIDthPixels = getResources().getdisplayMetrics().wIDthPixels;// ;        //创建一个从1到100的整型动画        ValueAnimator valueAnimator = ValueAnimator.ofInt(- (int) mTvHello.getPaint().measureText(getResources().getString(R.string.app_name)),wIDthPixels);        //给动画设置一个线性的插值器        valueAnimator.setInterpolator(new linearInterpolator());        //设置动画的执行时长        valueAnimator.setDuration(4000);//        设置动画的重复次数        valueAnimator.setRepeatCount(ValueAnimator.INFINITE);        //设置动画的重复模式，REVERSE表示逆向重复，RESTART表示连续重复        valueAnimator.setRepeatMode(ValueAnimator.RESTART);        //给动画设置一个估值器        valueAnimator.setEvaluator(new IntEvaluator());        //设置动画的当前时间，取值范围为0~duration//        valueAnimator.setCurrentPlayTime(1000);        //设置动画的时间因子//        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LolliPOP_MR1) {//            valueAnimator.setCurrentFraction(0.5f);//        }        //给动画设置启动延迟，例如当前就是延迟1s启动动画        valueAnimator.setStartDelay(1000);        //给动画设置当前动态监听        valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {            @OverrIDe            public voID onAnimationUpdate(ValueAnimator animation) {                float animatedFraction = animation.getAnimatedFraction();                Integer integer = (Integer) animation.getAnimatedValue();                mTvHello.setTranslationX(integer.floatValue());                Log.d(TAG, "onAnimationUpdate: integer:" + integer + " animatedFraction" + animatedFraction);            }        });        //给动画设置状态监听        valueAnimator.addListener(new Animator.AnimatorListener() {            @OverrIDe            public voID onAnimationStart(Animator animation) {                //动画开始                Log.d(TAG, "onAnimationStart: ");            }            @OverrIDe            public voID onAnimationEnd(Animator animation) {                //动画结束                Log.d(TAG, "onAnimationEnd: ");            }            @OverrIDe            public voID onAnimationCancel(Animator animation) {                //取消动画                Log.d(TAG, "onAnimationCancel: ");            }            @OverrIDe            public voID onAnimationRepeat(Animator animation) {                //重复动画                Log.d(TAG, "onAnimationRepeat: ");            }        });        //启动动画        valueAnimator.start();

通过代码可以看到，ValueAnimator并不能直接让某个控件平移、缩放、渐变、旋转，而是它能在一段时间内动态的计算出一些值，要实现动画效果，那么可以将控件的属性设置为该值，当这些属性连续变化时，就能出现动画效果。以上代码的动画效果图如下：

三、ObjectAnimator的使用渐变

ObjectAnimator animator = ObjectAnimator.offloat(mTvHello, "Alpha", 1.0f, 0f);        animator.setDuration(3000);        animator.addListener(new Animator.AnimatorListener() {            @OverrIDe            public voID onAnimationStart(Animator animation) {                Log.d(TAG, "onAnimationStart: ");            }            @OverrIDe            public voID onAnimationEnd(Animator animation) {                Log.d(TAG, "onAnimationEnd: ");            }            @OverrIDe            public voID onAnimationCancel(Animator animation) {                Log.d(TAG, "onAnimationCancel: ");            }            @OverrIDe            public voID onAnimationRepeat(Animator animation) {                Log.d(TAG, "onAnimationRepeat: ");            }        });        animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {            @OverrIDe            public voID onAnimationUpdate(ValueAnimator animation) {                float animatedValue = (float) animation.getAnimatedValue();                Log.d(TAG, "onAnimationUpdate: "+animatedValue);            }        });        animator.setRepeatCount(ValueAnimator.INFINITE);        animator.setRepeatMode(ValueAnimator.REVERSE);        animator.start();

缩放

        ObjectAnimator animator = ObjectAnimator.offloat(mTvHello, "ScaleX", 1.0f, 0f);        animator.setDuration(3000);        animator.addListener(new Animator.AnimatorListener() {            @OverrIDe            public voID onAnimationStart(Animator animation) {                Log.d(TAG, "onAnimationStart: ");            }            @OverrIDe            public voID onAnimationEnd(Animator animation) {                Log.d(TAG, "onAnimationEnd: ");            }            @OverrIDe            public voID onAnimationCancel(Animator animation) {                Log.d(TAG, "onAnimationCancel: ");            }            @OverrIDe            public voID onAnimationRepeat(Animator animation) {                Log.d(TAG, "onAnimationRepeat: ");            }        });        animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {            @OverrIDe            public voID onAnimationUpdate(ValueAnimator animation) {                float animatedValue = (float) animation.getAnimatedValue();                Log.d(TAG, "onAnimationUpdate: "+animatedValue);            }        });        animator.setRepeatCount(ValueAnimator.INFINITE);        animator.setRepeatMode(ValueAnimator.REVERSE);        animator.start();

 ObjectAnimator animator = ObjectAnimator.offloat(mTvHello, "ScaleY", 1.0f, 0f);        animator.setDuration(3000);        animator.addListener(new Animator.AnimatorListener() {            @OverrIDe            public voID onAnimationStart(Animator animation) {                Log.d(TAG, "onAnimationStart: ");            }            @OverrIDe            public voID onAnimationEnd(Animator animation) {                Log.d(TAG, "onAnimationEnd: ");            }            @OverrIDe            public voID onAnimationCancel(Animator animation) {                Log.d(TAG, "onAnimationCancel: ");            }            @OverrIDe            public voID onAnimationRepeat(Animator animation) {                Log.d(TAG, "onAnimationRepeat: ");            }        });        animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {            @OverrIDe            public voID onAnimationUpdate(ValueAnimator animation) {                float animatedValue = (float) animation.getAnimatedValue();                Log.d(TAG, "onAnimationUpdate: "+animatedValue);            }        });        animator.setRepeatCount(ValueAnimator.INFINITE);        animator.setRepeatMode(ValueAnimator.REVERSE);        animator.start();

平移

ObjectAnimator animator = ObjectAnimator.offloat(mTvHello, "TranslationX", 0.0f, getResources().getdisplayMetrics().wIDthPixels/2);        animator.setDuration(3000);        animator.addListener(new Animator.AnimatorListener() {            @OverrIDe            public voID onAnimationStart(Animator animation) {                Log.d(TAG, "onAnimationStart: ");            }            @OverrIDe            public voID onAnimationEnd(Animator animation) {                Log.d(TAG, "onAnimationEnd: ");            }            @OverrIDe            public voID onAnimationCancel(Animator animation) {                Log.d(TAG, "onAnimationCancel: ");            }            @OverrIDe            public voID onAnimationRepeat(Animator animation) {                Log.d(TAG, "onAnimationRepeat: ");            }        });        animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {            @OverrIDe            public voID onAnimationUpdate(ValueAnimator animation) {                float animatedValue = (float) animation.getAnimatedValue();                Log.d(TAG, "onAnimationUpdate: "+animatedValue);            }        });        animator.setRepeatCount(ValueAnimator.INFINITE);        animator.setRepeatMode(ValueAnimator.REVERSE);        animator.start();

ObjectAnimator animator = ObjectAnimator.offloat(mTvHello, "TranslationY", 0.0f, getResources().getdisplayMetrics().wIDthPixels/2);        animator.setDuration(3000);        animator.addListener(new Animator.AnimatorListener() {            @OverrIDe            public voID onAnimationStart(Animator animation) {                Log.d(TAG, "onAnimationStart: ");            }            @OverrIDe            public voID onAnimationEnd(Animator animation) {                Log.d(TAG, "onAnimationEnd: ");            }            @OverrIDe            public voID onAnimationCancel(Animator animation) {                Log.d(TAG, "onAnimationCancel: ");            }            @OverrIDe            public voID onAnimationRepeat(Animator animation) {                Log.d(TAG, "onAnimationRepeat: ");            }        });        animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {            @OverrIDe            public voID onAnimationUpdate(ValueAnimator animation) {                float animatedValue = (float) animation.getAnimatedValue();                Log.d(TAG, "onAnimationUpdate: "+animatedValue);            }        });        animator.setRepeatCount(ValueAnimator.INFINITE);        animator.setRepeatMode(ValueAnimator.REVERSE);        animator.start();

旋转

 ObjectAnimator animator = ObjectAnimator.offloat(mTvHello, "Rotation", 0.0f, 360f);        animator.setDuration(3000);        animator.setInterpolator(new linearInterpolator());        animator.addListener(new Animator.AnimatorListener() {            @OverrIDe            public voID onAnimationStart(Animator animation) {                Log.d(TAG, "onAnimationStart: ");            }            @OverrIDe            public voID onAnimationEnd(Animator animation) {                Log.d(TAG, "onAnimationEnd: ");            }            @OverrIDe            public voID onAnimationCancel(Animator animation) {                Log.d(TAG, "onAnimationCancel: ");            }            @OverrIDe            public voID onAnimationRepeat(Animator animation) {                Log.d(TAG, "onAnimationRepeat: ");            }        });        animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {            @OverrIDe            public voID onAnimationUpdate(ValueAnimator animation) {                float animatedValue = (float) animation.getAnimatedValue();                Log.d(TAG, "onAnimationUpdate: "+animatedValue);            }        });        animator.setRepeatCount(ValueAnimator.INFINITE);        animator.setRepeatMode(ValueAnimator.RESTART);        animator.start();

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