/** 抛物线 */
public void parabolaRun(View view) {
ValueAnimator ani = new ValueAnimator();
ani.setDuration(1000);
ani.setObjectValues(new PointF(0, 0));
ani.setInterpolator(new LinearInterpolator());
ani.setEvaluator(
new TypeEvaluator<PointF>() {
@Override
public PointF evaluate(float fraction, PointF startValue, PointF endValue) {
Log.e("TAG", fraction + "");
// x方向的速度v=200px/s;y方向的加速度为0.5f,速度也是v
PointF point = new PointF();
point.x = mX * fraction;
point.y = mY * fraction * fraction;
return point;
}
});
ani.addUpdateListener(
new AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
PointF point = (PointF) animation.getAnimatedValue();
ivBall.setX(point.x);
ivBall.setY(point.y);
}
});
ani.start();
}
/** 圆周运动 */
public void circleRun(View view) {
ValueAnimator animator = new ValueAnimator();
animator.setDuration(10000);
animator.setTarget(mCircleBall);
animator.setObjectValues(new PointF(mCircleBall.getX(), mCircleBall.getY()));
animator.setInterpolator(new LinearInterpolator());
animator.setEvaluator(
new TypeEvaluator<PointF>() {
@Override
public PointF evaluate(float fraction, PointF startValue, PointF endValue) {
/** 设置圆的半径r为200px 圆点坐标为(x1,y1) 圆周上的点坐标的公式为 x = x1 + r * cos(wt) y = y1 + r * sin(wt) */
PointF point = new PointF();
point.x =
(float) (mScreenWidth / 2 + 200 * Math.cos(Math.toRadians(360 * fraction - 90)));
point.y = (float) (200 + 200 * Math.sin(Math.toRadians(360 * fraction - 90)));
return point;
}
});
// //设置重复模式，RESTART为结束后重新开始，REVERSE为按原来的轨迹逆向返回
// animator.setRepeatMode(Animation.RESTART);
// 设置重复次数，INFINITE为无限
animator.setRepeatCount(0);
animator.start();
animator.addUpdateListener(
new AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
PointF point = (PointF) animation.getAnimatedValue();
mCircleBall.setX(point.x);
mCircleBall.setY(point.y);
}
});
}
/**
* 抛物线
*
* @param view
*/
public void paowuxian(View view) {
final ValueAnimator valueAnimator = new ValueAnimator();
valueAnimator.setDuration(3000);
valueAnimator.setTarget(mBlueBall);
valueAnimator.setObjectValues(new PointF(0, 0));
valueAnimator.setInterpolator(new LinearInterpolator()); // 匀速
/**
* evaluator全部继承至TypeEvaluator接口，它只有一个evaluate()方法。它用来返回你要进行动画的那个属性在当前时间点所需要的属性值
* 根据属性的开始、结束值与TimeInterpolation计算出的因子计算出当前时间的属性值
*/
valueAnimator.setEvaluator(
new TypeEvaluator<PointF>() {
@Override
public PointF evaluate(float fraction, PointF startValue, PointF endValue) {
/**
* fraction 表示时间分值 画面绘制一帧所需要的时间 平抛运动可正交分解为两个运动：水平方向上的速度为V的匀速直线运动和竖直方向上的自由落体运动. 水平方向上位移是x
* = Vt； 竖直方向上的速度V = gt,位移y = gt²/2 这里设x的速度为200px/s g为260px/s 时间为3秒
*/
Log.e("sssssssss", fraction + "");
PointF point = new PointF();
point.x = 200 * 3 * fraction;
point.y = 260 * (fraction * 3) * (fraction * 3) / 2;
return point;
}
});
valueAnimator.start();
valueAnimator.addUpdateListener(
new AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
PointF point = (PointF) animation.getAnimatedValue();
mBlueBall.setX(point.x);
mBlueBall.setY(point.y);
}
});
/**
* 动画监听事件 AnimatorListenerAdapter继承了AnimatorListener接口，可以空实现所有的方法 你可以根据你的需要重写你需要的方法 主要的方法有
* onAnimationStart 开始 onAnimationRepeat 重复 onAnimationCancel 停止 onAnimationEnd 结束
*/
valueAnimator.addListener(
new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
super.onAnimationEnd(animation);
ViewGroup parent = (ViewGroup) mBlueBall.getParent();
if (mBlueBall != null) {
parent.removeView(mBlueBall);
}
}
@Override
public void onAnimationCancel(Animator animation) {
super.onAnimationCancel(animation);
}
});
}