自定义动画烟花

「爱情、让人受尽委屈。」 2022-06-09 13:35 220阅读 0赞

/** * Created by ylwang on 2017/8/10. */
    
    public class LineView extends View { 
    
        private final Paint paint = new Paint();
    
        public LineView(Context context) {
            this(context, null);
        }
    
        public LineView(Context context, @Nullable AttributeSet attrs) {
            this(context, attrs, 0);
        }
    
        public LineView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
            super(context, attrs, defStyleAttr);
            initParams();
        }
    
        private void initParams() {
            paint.setAntiAlias(true);
            paint.setStyle(Paint.Style.STROKE);
            paint.setStrokeWidth(2);
            paint.setColor(Color.parseColor("#ffffff"));
            angel = 360 / count;
        }
    
        public void setCount(int count) {
            this.count = count;
            this.angel = 360 / count;
            invalidate();
        }
    
        private int angel;
        private int count = 10;
        private float startX = 50, endX = 50;
        private float centerX = 100;
        private float centerY = 100;
        private float ratio = 2f / 3f;
        private float size = 500f;
    
        /** * 内圆半径/外圆半径 比例 * * @param ratio */
        public void setRatio(float ratio) {
            this.ratio = ratio;
            postInvalidate();
        }
    
        private float START_X;
    
        @Override
        protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
            super.onMeasure(widthMeasureSpec, heightMeasureSpec);
            centerX = getMeasuredWidth() / 2;
            centerY = getMeasuredHeight() / 2;
            size = centerX * (1 - ratio);//计算线的长度
            startX = centerX - size;//起点
            endX = startX;
            START_X = startX;
        }
    
        @Override
        protected void onDraw(Canvas canvas) {
            canvas.translate(centerX, centerY);
            for (int i = 0; i < count; i++) {
                canvas.rotate(angel);
                canvas.drawLine(startX, 0, endX, 0, paint);
            }
    // canvas.drawCircle(0, 0, endX - paint.getStrokeWidth(), paint);
    // canvas.drawCircle(0, 0, startX - paint.getStrokeWidth(), paint);
        }
    
        private void setStart(float tempX) {
            startX = START_X + tempX;
            invalidate();
        }
    
        private void setEnd(float tempX) {
            endX = START_X + tempX;
            invalidate();
        }
    
        public void startAnim() {
            final float startV = 0.0f;//起始透明度
            final float endV = 0.8f;//最终透明度
            ObjectAnimator fadeOutIn = ObjectAnimator.ofFloat(this, "alpha", startV, endV);
    // fadeOutIn.setInterpolator(new AccelerateDecelerateInterpolator());
            fadeOutIn.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
                @Override
                public void onAnimationUpdate(ValueAnimator animation) {
                    float f = (float) animation.getAnimatedValue();
                    float d = (f - startV) / endV;
                    if (d - 0.5f < 0.001) {
       //改变end
                        setEnd(size * (d * 2.0f));
                    } else {
       //大于 改变start
                        setStart(size * ((d - 0.5f) * 2.0f));
                    }
                }
            });
            fadeOutIn.addListener(new AnimatorListenerAdapter() {
                @Override
                public void onAnimationEnd(Animator animation) {
                    super.onAnimationEnd(animation);
                    animFinishListener.onFinish();
                }
            });
            fadeOutIn.setDuration(1600);
            fadeOutIn.start();
        }
    
        public void reset() {
            startX = START_X;//起点
            endX = START_X;
        }
    
    
        public interface onAnimFinishListener { 
            void onFinish();
        }
    
        private onAnimFinishListener animFinishListener;
    
        public void setOnAnimFinishListener(onAnimFinishListener animFinishListener) {
            this.animFinishListener = animFinishListener;
        }
    }