Android中自定义SeekBar如何实现分段显示不同背景颜色

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.os.Build;
import android.util.AttributeSet;
import android.widget.SeekBar;

/**
 *
 * @time 2020/6/4 18:32
 * 

 * 类描述：自定义多颜色的SeekBar
 */
public class MulticolourSeekBar extends SeekBar {

 /**
 * 画笔
 */
 private Paint mMulticlourPaint;

 /**
 * 刻度线的个数,等分数等于刻度线的个数加1
 */
 private int mMulticlourCount = 9;

 /**
 * 每条刻度线的宽度
 */
 private int mMulticlourWidth = 2;

 /**
 * 刻度线的颜色
 */
 private int mMulticlourColor = Color.WHITE;

 /**
 * 滑块上面是否要显示刻度线
 */
 private boolean isShowTopOfThumb = false;

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

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

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

 /**
 * 初始化
 */
 private void init() {
 //创建绘制刻度线的画笔
 mMulticlourPaint = new Paint();
 mMulticlourPaint.setColor(mMulticlourColor);
 mMulticlourPaint.setAntiAlias(true);

 //Api21及以上调用，去掉滑块后面的背景
 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
  setSplitTrack(false);
 }
 }

 /**
 * 重写onDraw方法绘制刻度线
 *
 * @param canvas
 */
 @Override
 protected synchronized void onDraw(Canvas canvas) {
 super.onDraw(canvas);

 //极限条件校验
 if (getWidth() <= 0 || mMulticlourCount <= 0) {
  return;
 }

 //获取每一份的长度
// int length = (getWidth() - getPaddingLeft() - getPaddingRight() - mMulticlourCount * mMulticlourWidth) / (mMulticlourCount + 1);
 int length = (getWidth() - getPaddingLeft() - getPaddingRight()) / (mMulticlourCount + 1);
 //计算刻度线的顶部坐标和底部坐标
 int rulerTop = getHeight() / 2 - getMinimumHeight() / 2;
 int rulerBottom = rulerTop + getMinimumHeight();

 //获取滑块的位置信息
 Rect thumbRect = null;
 if (getThumb() != null) {
  thumbRect = getThumb().getBounds();
 }
 //绘制刻度线
// for (int i = 1; i <= mMulticlourCount; i++) {
//  //计算刻度线的左边坐标和右边坐标
//  int rulerLeft = i * length + getPaddingLeft();
//  int rulerRight = rulerLeft + mMulticlourWidth;
//
//  //判断是否需要绘制刻度线
//  if (!isShowTopOfThumb && thumbRect != null && rulerLeft - getPaddingLeft() > thumbRect.left && rulerRight - getPaddingLeft() < thumbRect.right) {
//  continue;
//  }
//
//  //进行绘制
//  canvas.drawRect(rulerLeft, rulerTop, rulerRight, rulerBottom, mMulticlourPaint);
// }
 for (int i = 0; i <= mMulticlourCount; i++) {
  int left = getPaddingLeft() + i * length;
  int right = left + length;
  if (i % 3 == 0) {
  mMulticlourPaint.setColor(Color.RED);
  } else if (i % 3 == 1) {
  mMulticlourPaint.setColor(Color.YELLOW);
  } else {
  mMulticlourPaint.setColor(Color.BLUE);
  }
  if (i == 0) {
  canvas.drawCircle(getPaddingLeft() + 10, 20, 10, mMulticlourPaint);
  left += 10;
  canvas.drawRect(left, 10, right, 30, mMulticlourPaint);
  } else if (i == mMulticlourCount) {
  right -= 10;
  canvas.drawRect(left, 10, right, 30, mMulticlourPaint);
  canvas.drawCircle(right, 20, 10, mMulticlourPaint);
  } else {
  canvas.drawRect(left, 10, right, 30, mMulticlourPaint);
  }
 }
 }

 /**
 * 设置刻度线的个数
 *
 * @param mRulerCount
 */
 public void setRulerCount(int mRulerCount) {
 this.mMulticlourCount = mRulerCount;
 requestLayout();
 }

 /**
 * 设置刻度线的宽度，单位(px)
 *
 * @param mRulerWidth
 */
 public void setRulerWidth(int mRulerWidth) {
 this.mMulticlourWidth = mRulerWidth;
 requestLayout();
 }

 /**
 * 设置刻度线的颜色
 *
 * @param mRulerColor
 */
 public void setRulerColor(int mRulerColor) {
 this.mMulticlourColor = mRulerColor;
 if (mMulticlourPaint != null) {
  mMulticlourPaint.setColor(mRulerColor);
  requestLayout();
 }
 }

 /**
 * 滑块上面是否需要显示刻度线
 *
 * @param isShowTopOfThumb
 */
 public void setShowTopOfThumb(boolean isShowTopOfThumb) {
 this.isShowTopOfThumb = isShowTopOfThumb;
 requestLayout();
 }
}

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