Android实现一个带粘连效果的LoadingBar

package top.greendami.greendami;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Path;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.view.View;
/**
 * Created by GreendaMi on 2017/3/17.
 */
public class PPView extends View {
 String TAG = "PPView";
 //动画开关
 boolean isLoading = true;
 Context mContext;
 private int mWidth = 100;
 private int mheight = 100;
 public int mColor;
 public Paint mPaint = new Paint();
 float time = 0;
 //小球与中间打球的最远距离
 float distance = 100;

 public PPView(Context context) {
  super(context);
  mCOntext= context;
 }
 public PPView(Context context, @Nullable AttributeSet attrs) {
  super(context, attrs);
  mCOntext= context;
  mColor = context.getResources().getColor(R.color.colorPrimary);
  init();
 }
 private void init() {
  mPaint.setAntiAlias(true);
  mPaint.setColor(mColor);
 }
 @Override
 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
  super.onMeasure(widthMeasureSpec, heightMeasureSpec);
  int widthSpecSize = MeasureSpec.getSize(widthMeasureSpec);
  int heightSpecSize = MeasureSpec.getSize(heightMeasureSpec);
  //宽度至少是高度的4倍
  if (widthSpecSize <4 * heightSpecSize) {
   widthSpecSize = 4 * heightSpecSize;
  }
  mWidth = widthSpecSize;
  mheight = heightSpecSize;
  distance = 1.2f * mheight;
  setMeasuredDimension(widthSpecSize, heightSpecSize);
 }
 @Override
 protected void onDraw(Canvas canvas) {
  super.onDraw(canvas);
  if (isLoading) {
   //大圆半径
   float bigR = mheight * 0.32f + mheight * 0.03f * Math.abs((float) Math.sin(Math.toRadians(time)));
   float smallR = mheight * 0.22f + mheight * 0.03f * Math.abs((float) Math.cos(Math.toRadians(time)));
   float bigx = (getWidth()) / 2;
   //画中间大圆
   canvas.drawCircle(bigx, mheight / 2, bigR, mPaint);
   float smalx = getSmallCenterX();
   //画小圆
   canvas.drawCircle(smalx, mheight / 2, smallR, mPaint);
   //画链接
   //小球在右侧
   if (smalx > bigx) {
    Path path = new Path();
    //上面的贝塞尔曲线的第一个点，在大圆身上
    float x1 = bigx + bigR * (float) Math.cos(Math.toRadians(time));
    float y1 = mheight / 2 - bigR * (float) Math.sin(Math.toRadians(time));
    if (y1 > mheight / 2 - smallR) {
     y1 = mheight / 2 - smallR;
     x1 = bigx + (float) (Math.sqrt(bigR * bigR - smallR * smallR));
    }
    //上面的贝塞尔曲线的第三个点，在小圆身上
    float x2 = smalx - smallR * (float) Math.cos(Math.toRadians(time));
    float y2 = mheight / 2 - smallR * (float) Math.sin(Math.toRadians(time));
    if (y2 > mheight / 2 - smallR * 0.8) {
     y2 = mheight / 2 - smallR * 0.8f;
     x2 = smalx - smallR * (float) (Math.sqrt(1-0.64f));
    }
    //下面的贝塞尔曲线的第三个点，在小圆身上
    float x3 = smalx - smallR * (float) Math.cos(Math.toRadians(time));
    float y3 = mheight / 2 + smallR * (float) Math.sin(Math.toRadians(time));
    if (y3  mheight / 2 - smallR) {
     y1 = mheight / 2 - smallR;
     x1 = bigx - (float) (Math.sqrt(bigR * bigR - smallR * smallR));
    }
    float x2 = smalx - smallR * (float) Math.cos(Math.toRadians(time));
    float y2 = mheight / 2 - smallR * (float) Math.sin(Math.toRadians(time));
    if (y2 > mheight / 2 - smallR * 0.8) {
     y2 = mheight / 2 - smallR * 0.8f;
     x2 = smalx + smallR * (float) (Math.sqrt(1-0.64f));
    }
    float x3 = smalx - smallR * (float) Math.cos(Math.toRadians(time));
    float y3 = mheight / 2 + smallR * (float) Math.sin(Math.toRadians(time));
    if (y3 

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