本文实例为大家分享了Android自定义View实现气泡动画的具体代码，供大家参考，具体内容如下
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：Android实现气泡动画
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.JvmField
var radius = 0
// 圆心
@kotlin.jvm.JvmField
var cx = 0f
// 圆心
@kotlin.jvm.JvmField
var cy = 0f
// X轴速度
@kotlin.jvm.JvmField
var vx = 0f
// Y轴速度
@kotlin.jvm.JvmField
var vy = 0f
@kotlin.jvm.JvmField
var paint: Paint? = null
// 移动
fun move() {
//向角度的方向移动，偏移圆心
cx += vx
cy += 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;
}
}
@Override
protected 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- radius
mBall.cx = this.mRandom.nextInt(this.mWidth - mBall.radius) + mBall.radius;
mBall.cy = this.mRandom.nextInt(this.mHeight - mBall.radius) + mBall.radius;
}
}
@Override
protected 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.JvmField
var radius = 0
// 圆心
@kotlin.jvm.JvmField
var cx = 0f
// 圆心
@kotlin.jvm.JvmField
var cy = 0f
// X轴速度
@kotlin.jvm.JvmField
var vx = 0f
// Y轴速度
@kotlin.jvm.JvmField
var vy = 0f
@kotlin.jvm.JvmField
var paint: Paint? = null
// 移动
fun move() {
//向角度的方向移动，偏移圆心
cx += vx
cy += 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);
}
@Override
protected 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;
}
@Override
protected 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;
}
}
}
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自学编程网。
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