Android烟花效果(SurfaceView实现)

时间:2022-04-27 11:58:34

烟花效果搜出来好像很多,但是没有太好的例子,于是自己做了一个效果,仅仅是完成了定制的需求。看下效果:
Android烟花效果(SurfaceView实现)

效果是,一个气泡抛物线出来,然后爆开。大致跟上次分享的点赞特效差不多,仅仅是根据需求绘制不同的效果:SurfaceView实现点赞效果

把相同代码去掉了,要直接用的话拼接一下吧,这里主要是说一下绘制过程

/** * 直播页面点赞特效,采用SurfaceView绘制 * 与普通控件使用方法类似,点赞是只需要调用startBomb()即可 */
public class BombView extends SurfaceView implements SurfaceHolder.Callback {

    private static final int MAX_BUBBLE_COUNT = 90;

    private SurfaceHolder   mHolder; 
    private DrawTask        mDrawTask; // 绘制UI的线程
    private Paint           mPaint; // 绘制需要使用的画刷

    private FuseView mFuseView; // 引导的view

    private boolean mIsDismiss = false; //是否处于消失阶段

    private int mWidth; // 控件的宽度
    private int mHeight; // 控件的高度

    private int mBombX; // 旋转的中心X
    private int mBombY; // 旋转的中心Y

    private int dx = 0; // 引导view在坐抛物线运动时在x轴的增量

    private Bitmap[]    mDrawables; // 存放需要展示的图
    private int[]       mDrawableResIDs; // 存放需要展示的图

    private List<Bubble> mBubbles = Collections.synchronizedList(new LinkedList<Bubble>()); // 用于存放点赞信息

    private Random mRandom = new Random(); // 用于产生随机数

    public BombView(Context context, AttributeSet attrs) {
        super(context, attrs);
        mHolder = getHolder();
        mHolder.addCallback(this);
        mHolder.setKeepScreenOn(true);
        mHolder.setFormat(PixelFormat.TRANSPARENT);
        mPaint = new Paint();

        mDrawableResIDs = new int[] {
                R.drawable.praise_eight,
                R.drawable.praise_one,
                R.drawable.praise_third,
                R.drawable.praise_two,
                R.drawable.praise_five,
                R.drawable.praise_four,
                R.drawable.praise_seven,
                R.drawable.praise_six,
        };
        mDrawables = new Bitmap[mDrawableResIDs.length];
    }

    @Override
    protected void onDraw(final Canvas canvas) {

        if (canvas != null) {
            canvas.drawColor(Color.TRANSPARENT, Mode.CLEAR); // 清空界面

            if (mFuseView == null) {
                return;
            }

            if (mFuseView.y+mFuseView.bitmap.getHeight()/2 > mBombY) {
                mPaint.setAlpha(255);
                if (mFuseView.x+mFuseView.bitmap.getWidth()/2 > mWidth/2) { // 抛物线
                    mFuseView.scale = dx*1.5f/mWidth + 1f;

                    canvas.save();
                    mFuseView.x = mWidth*7/8 - dx;
                    mFuseView.y = (int) getY(dx);
                    canvas.scale(mFuseView.scale, mFuseView.scale, mFuseView.x+mFuseView.bitmap.getWidth()/2, mFuseView.y+mFuseView.bitmap.getHeight()/2);
                    canvas.drawBitmap(mFuseView.bitmap, mFuseView.x, mFuseView.y, mPaint);
                    canvas.restore();
                    dx += dip2px(4);

                } else { // 直线上升
                    canvas.save();
                    canvas.scale(mFuseView.scale, mFuseView.scale, mFuseView.x+mFuseView.bitmap.getWidth()/2, mFuseView.y+mFuseView.bitmap.getHeight()/2);
                    canvas.drawBitmap(mFuseView.bitmap, mFuseView.x, mFuseView.y, mPaint);
                    canvas.restore();
                    mFuseView.y -= dip2px(5);
                }
                postDelayed(mDrawTask, 5);

            } else {
                if (!mIsDismiss) {
                    mIsDismiss = mBubbles.size() > 0 && mBubbles.get(0).top < mWidth*9/20;
                }

                for (int i=mBubbles.size()-1; i>=0; i--) { // 绘制气泡
                    drawBubble(canvas, mBubbles.get(i));
                }

                // 大爱心放大消失
                mFuseView.x = mBombX - mFuseView.bitmap.getWidth()/2;
                mFuseView.y = mBombY - mFuseView.bitmap.getHeight()/2;
                mFuseView.scale += 0.2;
                mFuseView.alpha = (int)((5-mFuseView.scale)*85);// ps:85 = 255/3 根据缩放倍数来计算透明度
                if (mFuseView.alpha > 0) {
                    mPaint.setAlpha(mFuseView.alpha);
                    canvas.save();
                    canvas.scale(mFuseView.scale, mFuseView.scale, mBombX, mBombY);
                    canvas.drawBitmap(mFuseView.bitmap, mFuseView.x, mFuseView.y, mPaint);
                    canvas.restore();
                }
                if (mBubbles.size() > 0) {
                    postDelayed(mDrawTask, 10);
                } else {
                    release();
                }
            }

        }
    }

    private void drawBubble(Canvas canvas, Bubble bubble) {
        if (bubble.top + bubble.bitmap.getHeight()/2 > mWidth/2) {
            bubble.top = bubble.top - dip2px(2);
            return;
        }

        if (mIsDismiss) {
            bubble.alpha -= 12;
            if (bubble.alpha < 0) {
                mBubbles.remove(bubble);
                return;
            }
        }
        bubble.top -= dip2px(0.5f);
        if (bubble.scale < 1.2f) {
            bubble.scale += 0.015f;
        }

        mPaint.setAlpha(bubble.alpha);
        canvas.save();
        canvas.scale(bubble.scale, bubble.scale, bubble.left+bubble.bitmap.getWidth()/2, bubble.top+bubble.bitmap.getHeight()/2);
        canvas.rotate(bubble.rotate, mBombX, mBombY);
        canvas.drawBitmap(bubble.bitmap, bubble.left, bubble.top, mPaint);
        canvas.restore();
    }

    /** * 开始绘制爆炸彩蛋,如果上一个效果还没结束,则不处理新的 */
    public void startBomb() {
        if (mFuseView != null) {
            return;
        }
        initFuseView();
        generateBubble(MAX_BUBBLE_COUNT);
        dx = 0;
        mIsDismiss = false;
        post(mDrawTask);
    }

    /** * 初始化引导 */
    private void initFuseView() {
        mFuseView = new FuseView();
        mFuseView.x = mWidth*7/8;
        mFuseView.y = mHeight*17/20;
        mFuseView.bitmap = BitmapUtil.readBitmap(getResources(), R.drawable.praise_five);
    }


    /** * 添加点赞,会对传入的个数进行处理 * @param count */
    private void generateBubble(int count) {
        for (int i = 0; i < count; i++) {
            Bubble bubble = new Bubble();
            bubble.bitmap = getRandBitmap();
            bubble.alpha = 155 + mRandom.nextInt(100);
            bubble.scale = 0.6f + mRandom.nextFloat()*0.4f;

// bubble.rotate = mRandom.nextInt(360);
            bubble.rotate = 360*i/count; // 由于绘制时还需要缩放,不然可以使用增量旋转,即不用每次都restore
            if (bubble.rotate > 180) { // 反向旋转
                bubble.rotate = bubble.rotate - 360;
            }
            bubble.left = mWidth/2 - bubble.bitmap.getWidth()/2;

            float offset = 0;
            if (i % 2 == 0) {
                offset = mWidth*0.1f + mWidth*0.15f * i/count;
            } 
            if (i%3 == 0) {
                offset = mWidth*0.25f + mWidth*0.15f * i/count;
            } 
            if (i%5 == 0) {
                offset = mWidth*0.4f + mWidth*0.12f * mRandom.nextFloat();
            }
            bubble.top = offset - bubble.bitmap.getHeight();
            mBubbles.add(0, bubble);
        }
        mBubbles.get(0).top = mWidth*0.52f - dip2px(5); // 以第一个气泡的位置判断是否该dismiss
        mBubbles.get(0).alpha = 1; // 防止正在消失时突然显现出来
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
        this.mWidth = width;
        this.mHeight = height;

        mBombX = mWidth/2;
        mBombY = mWidth/2;
    }

    class Bubble {
        public Bitmap bitmap;

        public float scale  = 1.0f; // 缩放
        public float top  = 0f; // 偏移
        public float left  = 0f; // 偏移
        public int rotate  = 0; // 旋转
        public int alpha  = 255; // 透明度


        public Bubble() {
            this.bitmap = getRandBitmap();
        }
    }

    class FuseView {
        public Bitmap bitmap;
        public float scale;
        public int alpha;
        public int x;
        public int y;
    }
    // 抛物线
    private float getY(float x) {
        return mHeight*10/11 - 0.009f * x * x;
    }

    public void release() {
        mFuseView = null; // 防止过度绘制
        for (Bitmap bitmap : mDrawables) {
            if (bitmap != null && !bitmap.isRecycled()) {
                bitmap.recycle();
            }
        }
    }
}

代码链接:https://github.com/brian512/AndroidDemo


我写的编程博客客户端介绍:http://blog.csdn.net/brian512/article/details/51558809

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