本文實例為大家分享了android自定義view實現(xiàn)圓周運動的具體代碼，供大家參考，具體內(nèi)容如下

思想

自定義Animation，自己定義半徑，相當于原來控件的位置為（0,0），按照每個角度區(qū)間，計算新的位置，跟著時間變動

逆時針轉(zhuǎn)動

public class VenusCircleAnimation extends Animation { private int radii; public VenusCircleAnimation(int radii) { this.radii = radii; } @Override protected void applyTransformation(float interpolatedTime, Transformation t) { //根據(jù)取值范圍 確定圓周運動的角度范圍。360-0 float d = 360 * interpolatedTime;//interpolatedTime 取值范圍 0-1,表示時間 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得到的結(jié)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}; }}

順時針

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);

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