代码运行效果，如下：

代码：
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.view.View;

public class ProgressView extends View {

    public ProgressView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

public ProgressView(Context context, AttributeSet attrs) {
    super(context, attrs);
    initView(context);
}

public ProgressView(Context context) {
    super(context);
    initView(context);
}

/** 进度条最大值 */
private float maxCount;

/** 进度条当前值 */
private float currentCount;/** 画笔 */
private Paint mPaint;
private int mWidth, mHeight;
/** * 进度条斜线的宽度 */
private int GRAYWIDTH = 0;
private void initView(Context context) {
    setMaxCount(28);
    setCurrentCount(27);
}
@Override
protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    mPaint = new Paint();
    mPaint.setAntiAlias(true);
    int round = mHeight * 9 / 10;
    System.out.println("max=" + maxCount + " current=" + currentCount);
    mPaint.setColor(0xff5791FE);
    // 设置画笔的颜色
    RectF rectBg = new RectF(0, 0, mWidth, mHeight);
    canvas.drawRoundRect(rectBg, round, round, mPaint);
    // 画出圆角矩形背景
    mPaint.setColor(0xff5791FE);
    int myWidth = 5;
    RectF rectBlackBg = new RectF(myWidth, myWidth, mWidth - myWidth,mHeight - myWidth);
    canvas.drawRoundRect(rectBlackBg, round * 7 / 9, round * 7 / 9, mPaint);
    // 画出浅白色背景
    float section = currentCount / maxCount;
    RectF rectProgressBg = new RectF(myWidth, myWidth, (mWidth - myWidth)* section, mHeight - myWidth);
    mPaint.setColor(0xff2358F0);
    canvas.drawRoundRect(rectProgressBg, round * 7 / 9, round * 7 / 9,mPaint);
    RectF rectProgressBg2 = new RectF(myWidth, myWidth, (mWidth - myWidth)* section, mHeight - myWidth);
    mPaint.setColor(Color.rgb(187, 25, 0));
    mPaint.setColor(Color.BLACK);
    float myX = rectProgressBg2.left + myWidth;
    int length = (int) (((mWidth - myWidth) * section - myWidth) / (mHeight- myWidth * 2 - 2));
    if (length > 1) {for (int i = 0; i < length - 1; i++) {Path path = new Path();
        path.moveTo(myX + i * (mHeight - (mHeight - myWidth * 2 - 2))- 2, rectProgressBg2.bottom);
        path.lineTo(myX + GRAYWIDTH + i* (mHeight - (mHeight - myWidth * 2 - 2)) - 2,rectProgressBg2.bottom);
        path.lineTo(myX + GRAYWIDTH + (i + 1)* (mHeight - (mHeight - myWidth * 2 - 2)) - 2,rectProgressBg2.top);
        path.lineTo(myX + (i + 1)* (mHeight - (mHeight - myWidth * 2 - 2)) - 2,rectProgressBg2.top);path.close();
        if ((myX + GRAYWIDTH + (i + 1)* (mHeight - (mHeight - myWidth * 2 - 2)) - 2) > ((mWidth - myWidth)* section - myWidth)) {
            break;
        }
        canvas.drawPath(path, mPaint);
    }
    }
}
    /** * dip转换为px * * @param dip * @return */
    private int dipToPx(int dip) {
        float scale = getContext().getResources().getDisplayMetrics().density;
        return (int) (dip * scale + 0.5f * (dip >= 0 ? 1 : -1));
    }
    /*** * 设置最大的进度值 * * @param maxCount */
    public void setMaxCount(float maxCount) {this.maxCount = maxCount;
    }
    /*** * 设置当前的进度值 * * @param currentCount */
    public void setCurrentCount(float currentCount) {
        this.currentCount = currentCount > maxCount ? maxCount : currentCount;invalidate();
    }
    public float getMaxCount() {
        return maxCount;
    }
    public float getCurrentCount() {
        return currentCount;
    }
    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        int widthSpecMode = MeasureSpec.getMode(widthMeasureSpec);
        int widthSpecSize = MeasureSpec.getSize(widthMeasureSpec);
        int heightSpecMode = MeasureSpec.getMode(heightMeasureSpec);
        int heightSpecSize = MeasureSpec.getSize(heightMeasureSpec);
        if (widthSpecMode == MeasureSpec.EXACTLY|| widthSpecMode == MeasureSpec.AT_MOST) {
            mWidth = widthSpecSize;
        } else {
            mWidth = dipToPx(100);
        }if (heightSpecMode == MeasureSpec.AT_MOST|| heightSpecMode == MeasureSpec.UNSPECIFIED) {
            mHeight = dipToPx(15);
        } else {mHeight = heightSpecSize;
        }
        setMeasuredDimension(mWidth, mHeight);// 设置控件的宽高
    }
}