本文主要是介绍PathMeasure 自定义view 好看的加载效果，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！
根据上一篇PathMeasure的介绍，我们来实现一个好看的 加载效果
直接贴代码
public class PathMeasureView extends View
{private Paint mPaint = new Paint();private Paint mLinePaint = new Paint(); //坐标系private Bitmap mBitmap;private int width, height;private float len;private float mInnerLenght;private boolean isor = false;Path dst = new Path();Path innerDst = new Path();public PathMeasureView(Context context){this(context, null);}public PathMeasureView(Context context, AttributeSet attrs){this(context, attrs, 0);}public PathMeasureView(Context context, AttributeSet attrs, int defStyleAttr){super(context, attrs, defStyleAttr);mPaint.setStyle(Paint.Style.STROKE);mPaint.setColor(Color.BLACK);mPaint.setStrokeWidth(4);mLinePaint.setStyle(Paint.Style.STROKE);mLinePaint.setColor(Color.RED);mLinePaint.setStrokeWidth(6);}@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec){super.onMeasure(widthMeasureSpec, heightMeasureSpec);width = MeasureSpec.getSize(widthMeasureSpec);height = MeasureSpec.getSize(heightMeasureSpec);//防止过度测量if(!isor){isor=true;Path path = new Path();path.addCircle(width/2, height/2, 50, Path.Direction.CW);path.addCircle(width/2, height/2, 50, Path.Direction.CCW);final PathMeasure pathMeasure = new PathMeasure(path, false);len = pathMeasure.getLength();final PathMeasure pathMeasure1 = new PathMeasure(path, false);//移动到下一个path曲线pathMeasure1.nextContour();mInnerLenght=pathMeasure1.getLength();ValueAnimator animator = ValueAnimator.ofFloat(0, 1);animator.setDuration(1500);animator.setRepeatCount(ValueAnimator.INFINITE);animator.setInterpolator(new LinearInterpolator());animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener(){@Overridepublic void onAnimationUpdate(ValueAnimator animation){dst.reset();innerDst.reset();float start = (float) ((len * (float) animation.getAnimatedValue()) - ((0.5 - Math.abs((float) animation.getAnimatedValue() - 0.5)) * len));pathMeasure.getSegment(start, (len * (float) animation.getAnimatedValue()), dst, true);//pathMeasure.getSegment(0, (len * (float) animation.getAnimatedValue()), dst, true);float start1 = (float) ((mInnerLenght * (float) animation.getAnimatedValue()) - ((0.5 - Math.abs((float) animation.getAnimatedValue() - 0.5)) * mInnerLenght));pathMeasure1.getSegment(start1, (mInnerLenght * (float) animation.getAnimatedValue()), innerDst, true);invalidate();}});animator.start();}}@Overrideprotected void onDraw(Canvas canvas){super.onDraw(canvas);canvas.drawPath(dst, mLinePaint);canvas.drawPath(innerDst, mLinePaint);}private float[] pos = new float[2];private float[] tan = new float[2];
}
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