Android动画总结 (valueAnimator、objectAnimator、AnimatorSet、PropertyValuesHolder、Interpolator)
16lz
2021-01-26
参考官方文档:https://developer.android.com/guide/topics/graphics/prop-animation#api-overview
概述
笔者近期接触到android动画,将诸多概念都稍微整理了一下。
一方面做一个知识的记录,另一方面也给刚接触android动画的初学者一个参考。
主要内容
- ValueAnimator
- ObjectAnimator(包括AnimatorSet,PropertyValuesHolder)
- AnimatorSet 和 PropertyValuesHolder
- 插值器(Interpolator)
valueAnimator
valueAnimator可以控制某个值的变化,通过在值变化的同时刷新View来实现动画。
下面的例子是实现TextView中值的刷新:
ValueAnimator valueAnimator = ValueAnimator.ofInt(0, 1000); valueAnimator.setDuration(5000); valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator animation) { tv1.setText(animation.getAnimatedValue() + ""); } }); valueAnimator.start();
ObjectAnimator
ObjectAnimator可以对某个View执行属性动画,常见的属性动画有旋转,平移,缩放等。
ObjectAnimator一般是配合着AnimatorSet或者PropertyValuesHolder使用,demo如下,以下两块代码实现的是同一种效果:“btn先放大后缩小”。
属性动画有以下几种:(来自官方文档)
- translationX,translationY:从当前位置开始平移
- rotation, rotationX, rotationY:旋转
- scaleX , scaleY:缩放
- pivotX , pivotY:旋转和缩放的参照点,默认是View的中心
- x , y:平移到当前容器的某个绝对位置
- alpha:透明度
/* ObjectAnimator + PropertyValuesHolder */ PropertyValuesHolder xHolder = PropertyValuesHolder.ofFloat("scaleX", 1, 1.5f, 0.8f, 1); PropertyValuesHolder yHolder = PropertyValuesHolder.ofFloat("scaleY", 1, 1.5f, 0.8f, 1); ObjectAnimator objectAnimator = ObjectAnimator.ofPropertyValuesHolder(btn0, xHolder, yHolder); objectAnimator.setDuration(3000); objectAnimator.start(); /* * ObjectAnimator + AnimatorSet */ ObjectAnimator anim1 = ObjectAnimator.ofFloat(btn1, "scaleX", 1, 1.5f, 0.8f, 1); ObjectAnimator anim2 = ObjectAnimator.ofFloat(btn1, "scaleY", 1, 1.5f, 0.8f, 1); final AnimatorSet animatorSet = new AnimatorSet(); animatorSet.play(anim1); animatorSet.play(anim2).with(anim1); animatorSet.setDuration(3000); animatorSet.start();
AnimatorSet 和 PropertyValuesHolder
PropertyValuesHolder:
适合在实现“单个View连续动画”的情况下使用,使用AnimatorSet在一些情况下会比PropertyValuesHolder复杂一些。
比如要实现View的循环播放,使用PropertyValuesHolder实现的代码如下:
objectAnimator.setRepeatCount(-1);
使用AnimatorSet实现的代码如下:
animatorSet.addListener(new Animator.AnimatorListener() { @Override public void onAnimationStart(Animator animation) { } @Override public void onAnimationEnd(Animator animation) { if (animatorSet != null) { animatorSet.start(); } } @Override public void onAnimationCancel(Animator animation) { } @Override public void onAnimationRepeat(Animator animation) { } });
AnimatorSet
适合在动画比较复杂的情况下使用,比如有多个View的动画需要同时进行或者交替进行,这种情况使用PropertyValuesHolder是很难实现的。
再比如,对于同一个View的动画不连续的情况,PropertyValuesHolder也比较难实现,或者说实现更加复杂。
demo中,View执行完平移之后再执行缩放逻辑。
ObjectAnimator anim11 = ObjectAnimator.ofFloat(tv2, "translationX", 200); ObjectAnimator anim22 = ObjectAnimator.ofFloat(tv2, "scaleX", 1, 1.5f, 1f); ObjectAnimator anim33 = ObjectAnimator.ofFloat(tv2, "scaleY", 1, 1.5f, 1f); final AnimatorSet animatorSet2 = new AnimatorSet(); animatorSet2.play(anim11); animatorSet2.play(anim22).after(anim11); animatorSet2.play(anim33).with(anim22); animatorSet2.setDuration(3000); animatorSet2.start();
插值器(Interpolator)
插值器可以控制动画变化的速率,设置非常简单,代码如下:
ValueAnimator valueAnimator = ValueAnimator.ofInt(0, 1000); valueAnimator.setDuration(5000); valueAnimator.setInterpolator(new DecelerateInterpolator());//设置插值器 valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator animation) { tv1.setText(animation.getAnimatedValue() + ""); } }); valueAnimator.start();
插值器类型:(来自官方文档)
- AccelerateDecelerateInterpolator:开始和结束的时候慢,中间快
- AccelerateInterpolator:开始的时候慢,然后加速
- AnticipateInterpolator:开始先后退,然后向前
- AnticipateOvershootInterpolator: 开始先后退,然向前到超标,最后回到最终值
- BounceInterpolator :最后会反弹
- CycleInterpolator:动画会重复一定的周期数
- DecelerateInterpolator:开始快,然后减速
- LinearInterpolator:变化匀速
- OvershootInterpolator:到达最终值后超标,再回到最终值
- TimeInterpolator:用来自定义插值器
demo代码:
public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); LinearLayout linearLayout = new LinearLayout(this); linearLayout.setOrientation(LinearLayout.VERTICAL); setContentView(linearLayout); // test View final TextView tv1 = new TextView(this); tv1.setText(0 + ""); tv1.setTextSize(30); linearLayout.addView(tv1); final Button btn0 = new Button(this); btn0.setText("btn0"); linearLayout.addView(btn0); final Button btn1 = new Button(this); btn1.setText("btn1"); linearLayout.addView(btn1); final TextView tv2 = new TextView(this); tv2.setText("tv2"); tv2.setTextSize(30); linearLayout.addView(tv2); final Button btn2 = new Button(this); btn2.setText("btn2"); linearLayout.addView(btn2); final Button btn3 = new Button(this); btn3.setText("btn3"); linearLayout.addView(btn3); /* * ValueAnimator +时间插值器演示 */ ValueAnimator valueAnimator = ValueAnimator.ofInt(0, 1000); valueAnimator.setDuration(5000); valueAnimator.setInterpolator(new DecelerateInterpolator());//设置插值器 valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator animation) { tv1.setText(animation.getAnimatedValue() + ""); } }); valueAnimator.start(); /* ObjectAnimator + PropertyValuesHolder */ PropertyValuesHolder xHolder = PropertyValuesHolder.ofFloat("scaleX", 1, 1.5f, 0.8f, 1); PropertyValuesHolder yHolder = PropertyValuesHolder.ofFloat("scaleY", 1, 1.5f, 0.8f, 1); ObjectAnimator objectAnimator = ObjectAnimator.ofPropertyValuesHolder(btn0, xHolder, yHolder); objectAnimator.setDuration(3000);// objectAnimator.setRepeatCount(-1); objectAnimator.start(); /* * ObjectAnimator + AnimatorSet */ ObjectAnimator anim1 = ObjectAnimator.ofFloat(btn1, "scaleX", 1, 1.5f, 0.8f, 1); ObjectAnimator anim2 = ObjectAnimator.ofFloat(btn1, "scaleY", 1, 1.5f, 0.8f, 1); final AnimatorSet animatorSet = new AnimatorSet(); animatorSet.play(anim1); animatorSet.play(anim2).with(anim1); animatorSet.setDuration(3000); animatorSet.addListener(new Animator.AnimatorListener() { @Override public void onAnimationStart(Animator animation) { } @Override public void onAnimationEnd(Animator animation) { if (animatorSet != null) { animatorSet.start(); } } @Override public void onAnimationCancel(Animator animation) { } @Override public void onAnimationRepeat(Animator animation) { } }); animatorSet.start(); /* * ObjectAnimator + AnimatorSet */ ObjectAnimator anim11 = ObjectAnimator.ofFloat(tv2, "translationX", 200); ObjectAnimator anim22 = ObjectAnimator.ofFloat(tv2, "scaleX", 1, 1.5f, 1f); ObjectAnimator anim33 = ObjectAnimator.ofFloat(tv2, "scaleY", 1, 1.5f, 1f); final AnimatorSet animatorSet2 = new AnimatorSet(); animatorSet2.play(anim11); animatorSet2.play(anim22).after(anim11); animatorSet2.play(anim33).with(anim22); animatorSet2.setDuration(3000); animatorSet2.start(); }}
更多相关文章
- Android中设置启动动画
- Android(安卓)绘制一个Loading动画__向图片中缓慢填充颜色,从而
- Android(安卓)RotateAnimation动画不能旋转的问题
- android 旋转动画一直转,不卡顿
- Android(安卓)View体系(三)--实现 View 的滑动七种方式
- Android(安卓)属性动画 实现view翻转 旋转 平移 拉伸 透明度 背
- Android(安卓)API 中文 (51) —— ZoomButtonsController
- Android中一个动画应用于两个View中不同步的问题
- Android(安卓)API 中文 (52) —— ZoomButtonsController.OnZoomLi