一、前言

最近有需求制作一个水壶的气泡动画，首先在网上查找了一番，找到了一个文章。

https://blog.csdn.net/u010386612/article/details/50580080

测试了一下发现，如果把它作为子视图的话，会出现小球溢出边界的情况。所以简单的修改了一下。

二、代码

1. 随机移动的气泡

Ball类

/*** @author jiang yuhang* @date 2021-04-18 19:57*/
class Ball {// 半径@kotlin.jvm.JvmFieldvar radius = 0// 圆心@kotlin.jvm.JvmFieldvar cx = 0f// 圆心@kotlin.jvm.JvmFieldvar cy = 0f// X轴速度@kotlin.jvm.JvmFieldvar vx = 0f// Y轴速度@kotlin.jvm.JvmFieldvar vy = 0f@kotlin.jvm.JvmFieldvar paint: Paint? = null// 移动fun move() {//向角度的方向移动，偏移圆心cx += vxcy += vy}fun left(): Int {return (cx - radius).toInt()}fun right(): Int {return (cx + radius).toInt()}fun bottom(): Int {return (cy + radius).toInt()}fun top(): Int {return (cy - radius).toInt()}
}

BallView类

/*** @author jiang yuhang* @date 2021-04-18 19:53*/
public class BallView extends View {private final Random mRandom;private final int mCount = 5;   // 小球个数private final int minSpeed = 5; // 小球最小移动速度private final int maxSpeed = 20; // 小球最大移动速度public Ball[] mBalls;   // 用来保存所有小球的数组private int maxRadius;  // 小球最大半径private int minRadius; // 小球最小半径private int mWidth = 200;private int mHeight = 200;public BallView(final Context context, final AttributeSet attrs) {super(context, attrs);// 初始化所有球(设置颜色和画笔, 初始化移动的角度)this.mRandom = new Random();final RandomColor randomColor = new RandomColor(); // 随机生成好看的颜色，github开源库。this.mBalls = new Ball[this.mCount];for (int i = 0; i < this.mCount; i++) {this.mBalls[i] = new Ball();// 设置画笔final Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);paint.setColor(randomColor.randomColor());paint.setStyle(Paint.Style.FILL);paint.setAlpha(180);paint.setStrokeWidth(0);// 设置速度final float speedX = (this.mRandom.nextInt(this.maxSpeed - this.minSpeed + 1) + 5) / 10f;final float speedY = (this.mRandom.nextInt(this.maxSpeed - this.minSpeed + 1) + 5) / 10f;this.mBalls[i].paint = paint;this.mBalls[i].vx = this.mRandom.nextBoolean() ? speedX : -speedX;this.mBalls[i].vy = this.mRandom.nextBoolean() ? speedY : -speedY;}}@Overrideprotected void onMeasure(final int widthMeasureSpec, final int heightMeasureSpec) {super.onMeasure(widthMeasureSpec, heightMeasureSpec);this.mWidth = View.resolveSize(this.mWidth, widthMeasureSpec);this.mHeight = View.resolveSize(this.mHeight, heightMeasureSpec);this.setMeasuredDimension(this.mWidth, this.mHeight);this.maxRadius = this.mWidth / 12;this.minRadius = this.maxRadius / 2;// 初始化圆的半径和圆心for (Ball mBall : this.mBalls) {mBall.radius = this.mRandom.nextInt(this.maxRadius + 1 - this.minRadius) + this.minRadius;// 初始化圆心的位置， x最小为 radius， 最大为mwidth- radiusmBall.cx = this.mRandom.nextInt(this.mWidth - mBall.radius) + mBall.radius;mBall.cy = this.mRandom.nextInt(this.mHeight - mBall.radius) + mBall.radius;}}@Overrideprotected void onDraw(final Canvas canvas) {final long startTime = System.currentTimeMillis();// 先画出所有圆for (int i = 0; i < this.mCount; i++) {final Ball ball = this.mBalls[i];canvas.drawCircle(ball.cx, ball.cy, ball.radius, ball.paint);}// 球碰撞边界for (int i = 0; i < this.mCount; i++) {final Ball ball = this.mBalls[i];this.collisionDetectingAndChangeSpeed(ball); // 碰撞边界的计算ball.move(); // 移动}final long stopTime = System.currentTimeMillis();final long runTime = stopTime - startTime;// 16毫秒执行一次this.postInvalidateDelayed(Math.abs(runTime - 16));}// 判断球是否碰撞碰撞边界public void collisionDetectingAndChangeSpeed(final Ball ball) {final int left = 0;final int top = 0;final int right = this.mWidth;final int bottom = this.mHeight;final float speedX = ball.vx;final float speedY = ball.vy;// 碰撞左右，X的速度取反。 speed的判断是防止重复检测碰撞，然后黏在墙上了=。=if (ball.left() <= left && speedX < 0) {ball.vx = -ball.vx;} else if (ball.top() <= top && speedY < 0) {ball.vy = -ball.vy;} else if (ball.right() >= right && speedX > 0) {ball.vx = -ball.vx;} else if (ball.bottom() >= bottom && speedY > 0) {ball.vy = -ball.vy;}}
}

2.热水气泡

/*** @author jiang yuhang* @date 2021-04-18 19:57*/
class Ball {// 半径@kotlin.jvm.JvmFieldvar radius = 0// 圆心@kotlin.jvm.JvmFieldvar cx = 0f// 圆心@kotlin.jvm.JvmFieldvar cy = 0f// X轴速度@kotlin.jvm.JvmFieldvar vx = 0f// Y轴速度@kotlin.jvm.JvmFieldvar vy = 0f@kotlin.jvm.JvmFieldvar paint: Paint? = null// 移动fun move() {//向角度的方向移动，偏移圆心cx += vxcy += vy}fun left(): Int {return (cx - radius).toInt()}fun right(): Int {return (cx + radius).toInt()}fun bottom(): Int {return (cy + radius).toInt()}fun top(): Int {return (cy - radius).toInt()}
}

/*** @author jiang yuhang* @date 2021-04-18 19:53*/
public class BallView extends View {final RandomColor randomColor = new RandomColor(); // 随机生成好看的颜色，github开源库。private final Random mRandom = new Random();private final int mCount = 5;   // 小球个数private final int minSpeed = 5; // 小球最小移动速度private final int maxSpeed = 15; // 小球最大移动速度public Ball[] mBalls = new Ball[this.mCount];   // 用来保存所有小球的数组private int maxRadius;  // 小球最大半径private int minRadius; // 小球最小半径private int mWidth = 200;private int mHeight = 200;public BallView(final Context context, final AttributeSet attrs) {super(context, attrs);}@Overrideprotected void onMeasure(final int widthMeasureSpec, final int heightMeasureSpec) {super.onMeasure(widthMeasureSpec, heightMeasureSpec);this.mWidth = View.resolveSize(this.mWidth, widthMeasureSpec);this.mHeight = View.resolveSize(this.mHeight, heightMeasureSpec);this.setMeasuredDimension(this.mWidth, this.mHeight);this.maxRadius = this.mWidth / 12;this.minRadius = this.maxRadius / 2;// 初始化所有球(设置颜色和画笔, 初始化移动的角度)for (int i = 0; i < mBalls.length; i++) {this.mBalls[i] = getRandomBall();}}private Ball getRandomBall() {Ball mBall = new Ball();// 设置画笔setRandomBall(mBall);return mBall;}private void setRandomBall(Ball ball) {// 设置画笔final Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);paint.setColor(randomColor.randomColor());paint.setStyle(Paint.Style.FILL);paint.setAlpha(180);paint.setStrokeWidth(0);ball.paint = paint;// 设置速度final float speedX = (this.mRandom.nextInt(this.maxSpeed - this.minSpeed + 1) + 5) / 10f;final float speedY = (this.mRandom.nextInt(this.maxSpeed - this.minSpeed + 1) + 5) / 10f;ball.vx = this.mRandom.nextBoolean() ? speedX : -speedX;ball.vy = -speedY;ball.radius = mRandom.nextInt(maxRadius + 1 - minRadius) + minRadius;ball.cx = mRandom.nextInt(mWidth - ball.radius) + ball.radius;ball.cy = mHeight - ball.radius;}@Overrideprotected void onDraw(final Canvas canvas) {final long startTime = System.currentTimeMillis();// 先画出所有圆for (int i = 0; i < this.mCount; i++) {final Ball ball = this.mBalls[i];canvas.drawCircle(ball.cx, ball.cy, ball.radius, ball.paint);}// 球碰撞边界for (int i = 0; i < this.mCount; i++) {collisionDetectingAndChangeSpeed(mBalls[i]); // 碰撞边界的计算mBalls[i].move(); // 移动}final long stopTime = System.currentTimeMillis();final long runTime = stopTime - startTime;// 16毫秒执行一次this.postInvalidateDelayed(Math.abs(runTime - 16));}// 判断球是否碰撞碰撞边界public void collisionDetectingAndChangeSpeed(Ball ball) {final int left = 0;final int top = 0;final int right = this.mWidth;final int bottom = this.mHeight;final float speedX = ball.vx;final float speedY = ball.vy;// 碰撞左右，X的速度取反。 speed的判断是防止重复检测碰撞，然后黏在墙上了=。=if (ball.left() <= left && speedX < 0) {ball.vx = -ball.vx;} else if (ball.top() <= top && speedY < 0) {setRandomBall(ball);} else if (ball.right() >= right && speedX > 0) {ball.vx = -ball.vx;}}
}

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Android 气泡动画（自定义View类）

Android 气泡动画（自定义View类）

一、前言

二、代码

1. 随机移动的气泡

2.热水气泡

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