本文实例为大家分享了android自定义view实现圆周运动的具体代码，供大家参考，具体内容如下

思想

自定义Animation，自己定义半径，相当于原来控件的位置为（0,0），按照每个角度区间，计算新的位置，跟着时间变动

逆时针转动

public class VenusCircleAnimation extends Animation { private int radii; public VenusCircleAnimation(int radii) { this.radii = radii; } @Override protected void applyTransformation(float interpolatedTime, Transformation t) { //根据取值范围 确定圆周运动的角度范围。360-0 float d = 360 * interpolatedTime;//interpolatedTime 取值范围 0-1,表示时间 if (d > 360) { //算法二 d = d-360; } int[] ps = getNewLocation((int) d, radii);// t.getMatrix().setTranslate(ps[0], ps[1]); } public int[] getNewLocation(int newAngle, int r) { int newAngle1; int newX = 0, newY = 0; if (newAngle >= 0 && newAngle <= 90) { // Math.PI/180得到的结果就是1°，然后再乘以角度得到角度 newX = (int) ( - (r * Math.cos(newAngle * Math.PI / 180))); newY = (int) (r * Math.sin(newAngle * Math.PI / 180)); } else if (newAngle >= 90 && newAngle <= 180) {// 90-180 newAngle1 = 180 - newAngle; newX = (int) (r * Math.cos(newAngle1 * Math.PI / 180)); newY = (int) (r * Math.sin(newAngle1 * Math.PI / 180)); } else if (newAngle >= 180 && newAngle <= 270) {//180-270 newAngle1 = 270 - newAngle; newX = (int) (r * Math.sin(newAngle1 * Math.PI / 180)); newY = (int) ( - (r * Math.cos(newAngle1 * Math.PI / 180))); } else if (newAngle >= 270) {//270-360 newAngle1 = 360 - newAngle; newX = (int) ( - (r * Math.cos(newAngle1 * Math.PI / 180))); newY = (int) ( - (r * Math.sin(newAngle1 * Math.PI / 180))); } return new int[]{newX, newY}; }}

顺时针

public class CircleAnimation extends Animation { private int radii; public CircleAnimation(int radii) { this.radii = radii; } @Override protected void applyTransformation(float interpolatedTime, Transformation t) { float d = 360 * interpolatedTime ; if (d > 360) { d = d - 360; } int[] ps = getNewLocation((int) d, radii);// t.getMatrix().setTranslate(ps[0], ps[1]); } public int[] getNewLocation(int newAngle, int r) { int newAngle1; int newX = 0, newY = 0; if (newAngle >= 0 && newAngle <= 90) { newX = (int) (r * Math.sin(newAngle * Math.PI / 180)); newY = (int) ( - (r * Math.cos(newAngle * Math.PI / 180))); } else if (newAngle >= 90 && newAngle <= 180) {// 90-180 newAngle1 = 180 - newAngle; newX = (int) (r * Math.sin(newAngle1 * Math.PI / 180)); newY = (int) (r * Math.cos(newAngle1 * Math.PI / 180)); } else if (newAngle >= 180 && newAngle <= 270) {//180-270 newAngle1 = 270 - newAngle; newX = (int) ( - (r * Math.cos(newAngle1 * Math.PI / 180))); newY = (int) (r * Math.sin(newAngle1 * Math.PI / 180)); } else if (newAngle >= 270 && newAngle <= 360) {//270-360 newAngle1 = 360 - newAngle; newX = (int) ( - (r * Math.sin(newAngle1 * Math.PI / 180))); newY = (int) ( - (r * Math.cos(newAngle1 * Math.PI / 180))); } return new int[]{newX, newY}; }}

使用

CircleAnimation animationw = new CircleAnimation(m); animationw.setDuration(d); animationw.setRepeatCount(-1); animationw.setInterpolator(new LinearInterpolator()); imageView.startAnimation(animationw);

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。