Android 自定义SeekBar 实现分段显示不同背景颜色的示例代码

在最近的开发工作中，要实现一个调色板的进度条，seekbar要分成10段显示不同颜色，功夫不负有心人，终于实现了这个功能，下面分享给大家
示例图：

1.自定义seekbar

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
 * <p>
 * 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();
 }
}

2.activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.constraintlayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:app="http://schemas.android.com/apk/res-auto"
 xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 tools:context=".mainactivity">

 <com.xinrui.view.multicolourseekbar
 android:id="@+id/seek_bar"
 android:layout_width="350px"
 android:layout_height="wrap_content"
 android:background="@null"
 android:maxheight="20px"
 android:minheight="20px"
 android:max="100"
 android:progress="5"
 android:progressdrawable="@drawable/shape_progress_drawable"
 android:thumb="@drawable/shape_thumb_icon"
 android:thumboffset="-2px"
 app:layout_constraintbottom_tobottomof="parent"
 app:layout_constraintend_toendof="parent"
 app:layout_constraintstart_tostartof="parent"
 app:layout_constrainttop_totopof="parent" />

</android.support.constraint.constraintlayout>

3.shape_progress_drawable.xml

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
 <item android:id="@android:id/background">
 <shape>
  <solid android:color="#e1e8f0" />
  <size android:height="8px" />
  <corners android:radius="8px" />
 </shape>
 </item>

 <item android:id="@android:id/progress">
 <clip>
  <shape>
  <gradient
   android:endcolor="@android:color/transparent"
   android:startcolor="@android:color/transparent" />
  <size android:height="8px" />
  <corners android:radius="8px" />
  </shape>
 </clip>
 </item>
</layer-list>

4.shape_thumb_icon.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
 android:shape="rectangle">

 <size
 android:width="5px"
 android:height="40px" />

 <solid android:color="@android:color/widget_edittext_dark" />
</shape>

总结

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