Android中自定义弧形的seekbar_android 虚弧线seekbar

项目需求，需要做一个弧形的seekbar
先看下效果，可以点击滑动来确定级别的弧形seekbar。

分析：

直接上代码，代码有注释

package com.hughzhao.seekbardemo.ui;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.PixelFormat;
import android.graphics.Point;
import android.graphics.PointF;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Scroller;

import java.math.BigDecimal;

/**
 * 自定义弧形SeekBar
 * create by hugh zhao 2020/3/18
 */
public class MySeekBar extends View {
   

    private Scroller scroller;
    //画笔
    private Paint paint;
    private Path path;
    private PointF pointF1; // 起始点
    private PointF pointF2; // 控制点
    private PointF pointF3; // 终止点

    Bitmap mThumbBitmap;//设置圆球的样式
    private int mThumbWidth;//圆球的宽度


    private int top;//当前view的参数
    private int right;
    private int bottom;
    private int left;
    private float currentX; // 当前x坐标
    private int currentLevel ; // 当前档次
    private int defaultLevel = 1;
    private OnProgressChangedListener listener;

    private int  mLevel  ; // 设置档次

    public MySeekBar(Context context) {
   
        super(context);
        init(context);
    }

    public MySeekBar(Context context, AttributeSet attrs) {
   
        super(context, attrs);
        init(context);
    }

    public MySeekBar(Context context, AttributeSet attrs, int defStyleAttr) {
   
        super(context, attrs, defStyleAttr);
        init(context);
    }

    private void init(Context context) {
   
        paint = new Paint();
        path = new Path();
        pointF1 = new Poi
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