本文主要是介绍用path画一个抽象的树叶，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
源码地址:https://github.com/X-FAN/LeafView
只是个简单的demo,大家可以参考下
public class PathTestView extends View {private int mWidth;private int mHeight;private int mDuration = 5000;private int mState = 0;//当前状态;private float mFraction;private Paint mPaint;private PathMeasure mPathMeasure;private PathMeasure mPathMeasureLeft;private PathMeasure mPathMeasureRight;private ValueAnimator mAnimator;public PathTestView(Context context) {this(context, null);}public PathTestView(Context context, AttributeSet attrs) {this(context, attrs, 0);}public PathTestView(Context context, AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);initPaint();initPathAndMeasure();initAnimator();}private void initPaint() {mPaint = new Paint();mPaint.setStrokeWidth(10);mPaint.setStyle(Paint.Style.STROKE);mPaint.setColor(Color.WHITE);}private void initPathAndMeasure() {Path mPathLine = new Path();Path mPathLeft = new Path();Path mPathRight = new Path();mPathLine.lineTo(0, 400);mPathMeasure = new PathMeasure(mPathLine, false);mPathLeft.quadTo(-200, 200, 0, 400);//画贝赛尔曲线mPathMeasureLeft = new PathMeasure(mPathLeft, false);mPathRight.quadTo(200, 200, 0, 400);mPathMeasureRight = new PathMeasure(mPathRight, false);}private void initAnimator() {mAnimator = ValueAnimator.ofFloat(0f, 1.0f);mAnimator.setDuration(mDuration);mAnimator.setInterpolator(new DecelerateInterpolator());mAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {@Overridepublic void onAnimationUpdate(ValueAnimator animation) {mFraction = (float) animation.getAnimatedValue();invalidate();}});mAnimator.addListener(new AnimatorListenerAdapter() {@Overridepublic void onAnimationEnd(Animator animation) {if (mState < 3) {//更改状态mState++;} else {mState = 0;}mAnimator = mAnimator.clone();//本来想直接复用mAnimator,但是执行到onAnimationEnd,mAnimator貌似没有立即结束,直接start会有问题,mAnimator.start(); //问题待研究,若有知道具体原因的望告知}});mAnimator.start();}@Overrideprotected void onSizeChanged(int w, int h, int oldw, int oldh) {super.onSizeChanged(w, h, oldw, oldh);mWidth = w;mHeight = h;}@Overrideprotected void onDraw(Canvas canvas) {super.onDraw(canvas);canvas.translate(mWidth / 2, mHeight / 2);// 将画布坐标原点移动到中心位置canvas.scale(1, -1);//翻转y轴canvas.save();drawLine(canvas);drawLeaf(canvas);canvas.restore();}/*** 画叶子的边界** @param canvas*/private void drawLeaf(Canvas canvas) {Path dst = new Path();Path dstRight = new Path();switch (mState) {case 0:mPathMeasureLeft.getSegment(0, mPathMeasureLeft.getLength() * mFraction, dst, true);//取出要绘制部分的pathmPathMeasureRight.getSegment(0, mPathMeasureRight.getLength() * mFraction, dstRight, true);break;case 1:mPathMeasureLeft.getSegment(mPathMeasureLeft.getLength() * mFraction, mPathMeasureLeft.getLength(), dst, true);//取出要绘制部分的pathmPathMeasureRight.getSegment(mPathMeasureRight.getLength() * mFraction, mPathMeasureRight.getLength(), dstRight, true);break;case 2:mPathMeasureLeft.getSegment(mPathMeasureLeft.getLength() * (1 - mFraction), mPathMeasureLeft.getLength(), dst, true);//取出要绘制部分的pathmPathMeasureRight.getSegment(mPathMeasureRight.getLength() * (1 - mFraction), mPathMeasureRight.getLength(), dstRight, true);break;case 3:mPathMeasureLeft.getSegment(0, mPathMeasureLeft.getLength() * (1 - mFraction), dst, true);//取出要绘制部分的pathmPathMeasureRight.getSegment(0, mPathMeasureRight.getLength() * (1 - mFraction), dstRight, true);break;default:break;}canvas.drawPath(dst, mPaint);canvas.drawPath(dstRight, mPaint);}/*** 画主干*/private void drawLine(Canvas canvas) {Path dst = new Path();switch (mState) {case 0:mPathMeasure.getSegment(0, mPathMeasure.getLength() * mFraction, dst, true);break;case 1:mPathMeasure.getSegment(mPathMeasure.getLength() * mFraction, mPathMeasure.getLength(), dst, true);break;case 2:mPathMeasure.getSegment(mPathMeasure.getLength() * (1 - mFraction), mPathMeasure.getLength(), dst, true);break;case 3:mPathMeasure.getSegment(0, mPathMeasure.getLength() * (1 - mFraction), dst, true);break;default:break;}canvas.drawPath(dst, mPaint);}}
效果图
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