Android 自定义SeekBar 实现分段显示不同背景颜色的示例代码
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2022-03-20 18:46:21
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seekbarimport android.c...
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>
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