仿qq气泡通知粘连效果
2024-06-30 22:13:24
前些天看到网上有个仿qq气泡的效果看了看也不难 今天来自己实现一下
效果图
其实很简单就是一个绘制过程 用到了插补器 OvershootInterpolator
public class BubbleView extends View {private Paint mPaint;//画笔private int mMeasuredHeight;//控件高private int mMeasuredWidth;//控件宽private PointF mStaticPointF;//不动点的坐标private PointF mMovePointF;//移动点的坐标private double mLineK;//斜率private static final float RADIUS = 30; //初始化的半径大小private double mStaticRadius; //绘制时用到的半径//能够拖动的最大值private static final float MAX_DISTANCE = 300;private Path path;//是否超出过最大范围private boolean mIsOutOfRange = false;public BubbleView(Context context) {super(context);init();}public BubbleView(Context context, AttributeSet attrs) {super(context, attrs);init();}public BubbleView(Context context, AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);init();}@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {super.onMeasure(widthMeasureSpec, heightMeasureSpec);mMeasuredHeight = getMeasuredHeight();mMeasuredWidth = getMeasuredWidth();mStaticPointF.set(mMeasuredWidth / 2, mMeasuredHeight / 2);mMovePointF.set(mMeasuredWidth / 2, mMeasuredHeight / 2);}private void init() {mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);mPaint.setColor(getResources().getColor(android.R.color.holo_red_light));mStaticPointF = new PointF(mMeasuredWidth / 2, mMeasuredHeight / 2);mMovePointF = new PointF(mMeasuredWidth / 2, mMeasuredHeight / 2);mStaticRadius = RADIUS;mStaticPointF = new PointF(mMeasuredWidth / 2, mMeasuredHeight / 2);mMovePointF = new PointF(mMeasuredWidth / 2, mMeasuredHeight / 2);path = new Path();}@Overrideprotected void onDraw(Canvas canvas) {super.onDraw(canvas);//重置pathpath.reset();if (!mIsOutOfRange) {canvas.drawCircle(mStaticPointF.x, mStaticPointF.y, (float) mStaticRadius, mPaint);float dx = mMovePointF.x - mStaticPointF.x;float dy = mMovePointF.y - mStaticPointF.y;if (dx != 0) {mLineK = dy / dx;}PointF[] staticPoints = GeometryUtil.getIntersectionPoints(mStaticPointF, (float)mStaticRadius, mLineK);PointF[] movePoints = GeometryUtil.getIntersectionPoints(mMovePointF, 30, mLineK);PointF controlPoint = GeometryUtil.getPointByPercent(mStaticPointF, mMovePointF, 0.5f);path.moveTo(staticPoints[0].x, staticPoints[0].y);path.lineTo(staticPoints[1].x, staticPoints[1].y);path.quadTo(controlPoint.x, controlPoint.y, movePoints[1].x, movePoints[1].y);path.lineTo(movePoints[0].x, movePoints[0].y);path.quadTo(controlPoint.x, controlPoint.y, staticPoints[0].x, staticPoints[0].y);canvas.drawPath(path, mPaint);path.close();}canvas.drawCircle(mMovePointF.x, mMovePointF.y, 30, mPaint);}/*** 根据两圆的距离 计算中心固定圆半径* @param distance 两圆的距离*/private void getStaticRadius(float distance) {mStaticRadius = RADIUS * (0.8 * (MAX_DISTANCE - distance) / MAX_DISTANCE + 0.2);}@Overridepublic boolean onTouchEvent(MotionEvent event) {float distance = GeometryUtil.getDistanceBetween2Points(mStaticPointF, mMovePointF);switch (event.getAction()) {case MotionEvent.ACTION_DOWN:case MotionEvent.ACTION_MOVE:float dx = event.getX();float dy = event.getY();mMovePointF.set(dx, dy);if (distance > MAX_DISTANCE) {distance = MAX_DISTANCE;mIsOutOfRange = true;} else {}getStaticRadius(distance);break;case MotionEvent.ACTION_UP:if (distance > MAX_DISTANCE) {} else {if (mIsOutOfRange) {mMovePointF.set(mStaticPointF);mIsOutOfRange = false;} else {mIsOutOfRange = false;ValueAnimator valueAnimator = ObjectAnimator.ofFloat(1);final PointF startPointF = new PointF(mMovePointF.x, mMovePointF.y);valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {@Overridepublic void onAnimationUpdate(ValueAnimator valueAnimator) {//获得动画执行的百分比float animatedFraction = valueAnimator.getAnimatedFraction();PointF pointByPercent = GeometryUtil.getPointByPercent(startPointF, mStaticPointF, animatedFraction);mMovePointF.set(pointByPercent);float distance = GeometryUtil.getDistanceBetween2Points(mStaticPointF, mMovePointF);getStaticRadius(distance);invalidate();}});valueAnimator.setDuration(500);//添加一个插补器 OvershootInterpolatorvalueAnimator.setInterpolator(new OvershootInterpolator(3));valueAnimator.start();}}break;}invalidate();return true;}}github https://github.com/REIGE/BubbleView
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