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
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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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