Android自定義View實現(xiàn)氣泡動畫

更新時間：2021年04月23日 17:22:54 作者：JJJJiangYH

這篇文章主要為大家詳細(xì)介紹了Android自定義View實現(xiàn)氣泡動畫，文中示例代碼介紹的非常詳細(xì)，具有一定的參考價值，感興趣的小伙伴們可以參考一下

本文實例為大家分享了Android自定義View實現(xiàn)氣泡動畫的具體代碼，供大家參考，具體內(nèi)容如下

一、前言

最近有需求制作一個水壺的氣泡動畫，首先在網(wǎng)上查找了一番，找到了一個文章：Android實現(xiàn)氣泡動畫

測試了一下發(fā)現(xiàn)，如果把它作為子視圖的話，會出現(xiàn)小球溢出邊界的情況。所以簡單的修改了一下。

二、代碼

1. 隨機(jī)移動的氣泡

Ball類

/**
 * @author jiang yuhang
 * @date 2021-04-18 19:57
 */
class Ball {
    // 半徑
    @kotlin.jvm.JvmField
    var radius = 0

    // 圓心
    @kotlin.jvm.JvmField
    var cx = 0f

    // 圓心
    @kotlin.jvm.JvmField
    var cy = 0f

    // X軸速度
    @kotlin.jvm.JvmField
    var vx = 0f

    // Y軸速度
    @kotlin.jvm.JvmField
    var vy = 0f

    @kotlin.jvm.JvmField
    var paint: Paint? = null

    // 移動
    fun move() {
        //向角度的方向移動，偏移圓心
        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類

/**
 * @author jiang yuhang
 * @date 2021-04-18 19:53
 */
public class BallView extends View {
    private final Random mRandom;
    private final int mCount = 5;   // 小球個數(shù)
    private final int minSpeed = 5; // 小球最小移動速度
    private final int maxSpeed = 20; // 小球最大移動速度

    public Ball[] mBalls;   // 用來保存所有小球的數(shù)組
    private int maxRadius;  // 小球最大半徑
    private int minRadius; // 小球最小半徑
    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(設(shè)置顏色和畫筆, 初始化移動的角度)
        this.mRandom = new Random();
        final RandomColor randomColor = new RandomColor(); // 隨機(jī)生成好看的顏色，github開源庫。
        this.mBalls = new Ball[this.mCount];

        for (int i = 0; i < this.mCount; i++) {
            this.mBalls[i] = new Ball();
            // 設(shè)置畫筆
            final Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
            paint.setColor(randomColor.randomColor());
            paint.setStyle(Paint.Style.FILL);
            paint.setAlpha(180);
            paint.setStrokeWidth(0);

            // 設(shè)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;

        // 初始化圓的半徑和圓心
        for (Ball mBall : this.mBalls) {
            mBall.radius = this.mRandom.nextInt(this.maxRadius + 1 - this.minRadius) + this.minRadius;
            // 初始化圓心的位置， x最小為 radius， 最大為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();
        // 先畫出所有圓
        for (int i = 0; i < this.mCount; i++) {
            final Ball ball = this.mBalls[i];
            canvas.drawCircle(ball.cx, ball.cy, ball.radius, ball.paint);
        }

        // 球碰撞邊界
        for (int i = 0; i < this.mCount; i++) {
            final Ball ball = this.mBalls[i];
            this.collisionDetectingAndChangeSpeed(ball); // 碰撞邊界的計算
            ball.move(); // 移動
        }

        final long stopTime = System.currentTimeMillis();
        final long runTime = stopTime - startTime;
        // 16毫秒執(zhí)行一次
        this.postInvalidateDelayed(Math.abs(runTime - 16));
    }

    // 判斷球是否碰撞碰撞邊界
    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的判斷是防止重復(fù)檢測碰撞，然后黏在墻上了=。=
        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.熱水氣泡

/**
 * @author jiang yuhang
 * @date 2021-04-18 19:57
 */
class Ball {
    // 半徑
    @kotlin.jvm.JvmField
    var radius = 0

    // 圓心
    @kotlin.jvm.JvmField
    var cx = 0f

    // 圓心
    @kotlin.jvm.JvmField
    var cy = 0f

    // X軸速度
    @kotlin.jvm.JvmField
    var vx = 0f

    // Y軸速度
    @kotlin.jvm.JvmField
    var vy = 0f

    @kotlin.jvm.JvmField
    var paint: Paint? = null

    // 移動
    fun move() {
        //向角度的方向移動，偏移圓心
        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(); // 隨機(jī)生成好看的顏色，github開源庫。
    private final Random mRandom = new Random();
    private final int mCount = 5;   // 小球個數(shù)
    private final int minSpeed = 5; // 小球最小移動速度
    private final int maxSpeed = 15; // 小球最大移動速度
    public Ball[] mBalls = new Ball[this.mCount];   // 用來保存所有小球的數(shù)組
    private int maxRadius;  // 小球最大半徑
    private int minRadius; // 小球最小半徑
    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(設(shè)置顏色和畫筆, 初始化移動的角度)
        for (int i = 0; i < mBalls.length; i++) {
            this.mBalls[i] = getRandomBall();
        }
    }

    private Ball getRandomBall() {
        Ball mBall = new Ball();
        // 設(shè)置畫筆
        setRandomBall(mBall);
        return mBall;
    }

    private void setRandomBall(Ball ball) {
        // 設(shè)置畫筆
        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;

        // 設(shè)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();
        // 先畫出所有圓
        for (int i = 0; i < this.mCount; i++) {
            final Ball ball = this.mBalls[i];
            canvas.drawCircle(ball.cx, ball.cy, ball.radius, ball.paint);
        }

        // 球碰撞邊界
        for (int i = 0; i < this.mCount; i++) {
            collisionDetectingAndChangeSpeed(mBalls[i]); // 碰撞邊界的計算
            mBalls[i].move(); // 移動
        }

        final long stopTime = System.currentTimeMillis();
        final long runTime = stopTime - startTime;
        // 16毫秒執(zhí)行一次
        this.postInvalidateDelayed(Math.abs(runTime - 16));
    }

    // 判斷球是否碰撞碰撞邊界
    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的判斷是防止重復(fù)檢測碰撞，然后黏在墻上了=。=
        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;
        }
    }
}