用path画一个抽象的树叶

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() {            @Override            public void onAnimationUpdate(ValueAnimator animation) {                mFraction = (float) animation.getAnimatedValue();                invalidate();            }        });        mAnimator.addListener(new AnimatorListenerAdapter() {            @Override            public 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();    }    @Override    protected void onSizeChanged(int w, int h, int oldw, int oldh) {        super.onSizeChanged(w, h, oldw, oldh);        mWidth = w;        mHeight = h;    }    @Override    protected 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path                mPathMeasureRight.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path                mPathMeasureRight.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path                mPathMeasureRight.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path                mPathMeasureRight.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