android 带阻尼的周期运动

public void animate(View view) {        PropertyValuesHolder propertyValuesHolder = PropertyValuesHolder.ofFloat("y", view.getY(), view.getY()+70);        ObjectAnimator objectAnimator = ObjectAnimator.ofPropertyValuesHolder(view, propertyValuesHolder);        objectAnimator.setInterpolator(new CycleInterpolator(2));        objectAnimator.setDuration(400);        objectAnimator.start();    }

这个是y轴方向的一个周期运动（简谐运动）

我想让震幅越来越小我重写了CycleInterpolator

public class MyCycleInterpolator extends CycleInterpolator {    private  float cycles;    public MyCycleInterpolator(float cycles) {        super(cycles);        this.cycles=cycles;    }    public MyCycleInterpolator(Context context, AttributeSet attrs) {        super(context, attrs);    }    public float getInterpolation(float input) {        // return (float)(Math.sin(2 * cycles * Math.PI * (input)));        return (float)(Math.sin(2 * cycles * Math.PI * (input)))*(1f-input);    }}

根据简谐运动公式

我根据时间因子 input确定振幅 A=(1-input) 越来越小

实现了有阻尼上下震动的效果

  public void animateY(View view) {        PropertyValuesHolder propertyValuesHolder = PropertyValuesHolder.ofFloat("y", view.getY(), view.getY()+70);        ObjectAnimator objectAnimator = ObjectAnimator.ofPropertyValuesHolder(view, propertyValuesHolder);        objectAnimator.setInterpolator(new MyCycleInterpolator(2));        objectAnimator.setDuration(400);        objectAnimator.start();    }

还有放大缩小的跟果冻似的效果

    public void animateScale(View view){        PropertyValuesHolder propertyValuesHolder1 = PropertyValuesHolder.ofFloat("scaleX",1f,1.5f);        PropertyValuesHolder propertyValuesHolder2 = PropertyValuesHolder.ofFloat("scaleY",1f,1.5f);        ObjectAnimator objectAnimator = ObjectAnimator.ofPropertyValuesHolder(view, propertyValuesHolder1,propertyValuesHolder2);        objectAnimator.setInterpolator(new MyCycleInterpolator(2));        objectAnimator.setDuration(400);        objectAnimator.start();    }

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