android实现年龄段选择器

本文实例为大家分享了android实现年龄段选择器的具体代码，供大家参考，具体内容如下

效果就是滑动圆形按钮选择时间，废话不多说，先上工具类

import android.view.view;

import android.content.context;
import android.graphics.bitmap;
import android.graphics.bitmapfactory;
import android.graphics.canvas;
import android.graphics.paint;
import android.util.attributeset;
import android.view.motionevent;

import com.zhiziyun.dmptest.bot.r;


/**
 * created by administrator on 2018/7/27.
 */

public class rangeseekbar extends view {
 private float linewidth = 5.0f;
 private float textsize = 25.0f;

 private int inrangecolor = 0xff247ab7;
 private int outrangecolor = 0xff777777;
 private int textcolor = 0xff247ab7;

 private int textmarginbottom = 10;

 private int lowercenterx;
 private int uppercenterx;

 private int bmpwidth;
 private int bmpheight;

 private bitmap lowerbmp;
 private bitmap upperbmp;

 private paint inrangepaint;
 private paint outrangepaint;
 private paint bmppaint;
 private paint textpaint;

 private boolean islowermoving = false;
 private boolean isuppermoving = false;

 private onrangechangedlistener onrangechangedlistener;

 private int paddingleft = 50;
 private int paddingright = 50;
 private int paddingtop = 50;
 private int paddingbottom = 10;

 private int lineheight;
 private int linelength = 400;
 private int linestart = paddingleft;
 private int lineend = linelength + paddingleft;

 private float smallvalue = 13.0f;//最小值
 private float bigvalue = 60.0f;//最大值

 private float smallrange = smallvalue;
 private float bigrange = bigvalue;

 private int textheight;

 public rangeseekbar(context context) {
  super(context);
  init();
 }

 public rangeseekbar(context context, attributeset attrs) {
  super(context, attrs);
  init();
 }

 public rangeseekbar(context context, attributeset attrs, int defstyle) {
  super(context, attrs, defstyle);
  init();
 }

 private void init() {
  lowerbmp = bitmapfactory.decoderesource(getresources(),
    r.drawable.circular);//圆形按钮图标，自己设置
  upperbmp = bitmapfactory.decoderesource(getresources(),
    r.drawable.circular);//圆形按钮图标，自己设置

  bmpwidth = upperbmp.getwidth();
  bmpheight = upperbmp.getheight();

  lowercenterx = linestart;
  uppercenterx = lineend;

  lineheight = getheight() - paddingbottom - lowerbmp.getheight() / 2;
  textheight = lineheight + lowerbmp.getheight() / 2 + 10;

 }

 private void initpaint() {
  // 绘制范围内的线条
  inrangepaint = new paint();
  inrangepaint.setantialias(true);
  inrangepaint.setstrokewidth(linewidth);
  inrangepaint.setcolor(inrangecolor);

  // 绘制范围外的线条
  outrangepaint = new paint();
  outrangepaint.setantialias(true);
  outrangepaint.setstrokewidth(linewidth);
  outrangepaint.setcolor(outrangecolor);

  // 画图片滑块
  bmppaint = new paint();

  // 画范围文字
  textpaint = new paint();
  textpaint.setcolor(textcolor);
  textpaint.settextsize(textsize);
  textpaint.setantialias(true);
  textpaint.setstrokewidth(linewidth);
 }

 private int measurewidth(int measurespec) {
  int result = 0;

  int specmode = measurespec.getmode(measurespec);
  int specsize = measurespec.getsize(measurespec);

  if (specmode == measurespec.exactly) {
   result = specsize;
  } else {
   result = paddingleft + paddingright + bmpwidth * 2;

   if (specmode == measurespec.at_most) {
    result = math.min(result, specsize);
   }
  }

  return result;
 }

 private int measureheight(int measureheight) {
  int result = 0;

  int specmode = measurespec.getmode(measureheight);
  int specsize = measurespec.getsize(measureheight);

  if (specmode == measurespec.exactly) {
   result = bmpheight * 2;
  } else {
   result = bmpheight + paddingtop;

   if (specmode == measurespec.at_most) {
    result = math.min(result, specsize);
   }
  }

  return result;
 }

 @override
 protected void onmeasure(int widthmeasurespec, int heightmeasurespec) {
  widthmeasurespec = measurewidth(widthmeasurespec);
  heightmeasurespec = measureheight(heightmeasurespec);
  setmeasureddimension(widthmeasurespec, heightmeasurespec);
 }

 @override
 protected void ondraw(canvas canvas) {
  super.ondraw(canvas);

  bmpwidth = upperbmp.getwidth();
  bmpheight = upperbmp.getheight();

  lineheight = getheight() - paddingbottom - lowerbmp.getheight() / 2;
  textheight = lineheight - bmpheight / 2 - textmarginbottom;

  // 画线
  paint linepaint = new paint();
  linepaint.setantialias(true);
  linepaint.setstrokewidth(linewidth);

  // 绘制处于图片滑块之间线段
  linepaint.setcolor(inrangecolor);
  canvas.drawline(lowercenterx, lineheight, uppercenterx, lineheight,
    linepaint);

  // 绘制处于图片滑块两端的线段
  linepaint.setcolor(outrangecolor);
  canvas.drawline(linestart, lineheight, lowercenterx, lineheight,
    linepaint);
  canvas.drawline(uppercenterx, lineheight, lineend, lineheight,
    linepaint);

  // 画图片滑块
  paint bmppaint = new paint();
  canvas.drawbitmap(lowerbmp, lowercenterx - bmpwidth / 2, lineheight
    - bmpheight / 2, bmppaint);
  canvas.drawbitmap(lowerbmp, uppercenterx - bmpwidth / 2, lineheight
    - bmpheight / 2, bmppaint);

  // 画范围文字
  paint textpaint = new paint();
  textpaint.setcolor(textcolor);
  textpaint.settextsize(textsize);
  textpaint.setantialias(true);
  textpaint.setstrokewidth(linewidth);
  canvas.drawtext(string.format("%.0f岁", smallrange), lowercenterx
    - bmpwidth / 2, textheight, textpaint);
  canvas.drawtext(string.format("%.0f岁", bigrange), uppercenterx
    - bmpwidth / 2, textheight, textpaint);
 }

 @override
 public boolean ontouchevent(motionevent event) {
  super.ontouchevent(event);

  float xpos = event.getx();
  switch (event.getaction()) {
   case motionevent.action_down:
    // 如果按下的位置在垂直方向没有与图片接触，则不会滑动滑块
    float ypos = event.gety();
    if (math.abs(ypos - lineheight) > bmpheight / 2) {
     return false;
    }

    // 表示当前按下的滑块是左边的滑块
    if (math.abs(xpos - lowercenterx) < bmpwidth / 2) {
     islowermoving = true;
    }

    // //表示当前按下的滑块是右边的滑块
    if (math.abs(xpos - uppercenterx) < bmpwidth / 2) {
     isuppermoving = true;
    }

    // 单击左边滑块的左边线条时，左边滑块滑动到对应的位置
    if (xpos >= linestart && xpos <= lowercenterx - bmpwidth / 2) {
     lowercenterx = (int) xpos;
     updaterange();
     postinvalidate();
    }

    // 单击右边滑块的右边线条时， 右边滑块滑动到对应的位置
    if (xpos <= lineend && xpos >= uppercenterx + bmpwidth / 2) {
     uppercenterx = (int) xpos;
     updaterange();
     postinvalidate();
    }
    break;
   case motionevent.action_move:
    // 滑动左边滑块时
    if (islowermoving) {
     if (xpos >= linestart && xpos < uppercenterx - bmpwidth) {
      lowercenterx = (int) xpos;
      updaterange();
      postinvalidate();
     }
    }

    // 滑动右边滑块时
    if (isuppermoving) {
     if (xpos > lowercenterx + bmpwidth && xpos < lineend) {
      uppercenterx = (int) xpos;
      updaterange();
      postinvalidate();
     }
    }

    break;
   case motionevent.action_up:
    // 修改滑块的滑动状态为不再滑动
    islowermoving = false;
    isuppermoving = false;
    break;
   default:
    break;
  }

  return true;
 }

 // 计算指定滑块对应的范围值
 private float computrange(float range) {
  return (range - linestart) * (bigvalue - smallvalue) / linelength
    + smallvalue;
 }

 // 滑动滑块的过程中，更新滑块上方的范围标识
 private void updaterange() {
  smallrange = computrange(lowercenterx);
  bigrange = computrange(uppercenterx);

  if (null != onrangechangedlistener) {
   onrangechangedlistener.onrangechanged(smallrange, bigrange);
  }
 }

 // 注册滑块范围值改变事件的监听
 public void setonrangechangedlistener(
   onrangechangedlistener onrangechangedlistener) {
  this.onrangechangedlistener = onrangechangedlistener;
 }

 // 公共接口，用户回调接口范围值的改变
 public interface onrangechangedlistener {

  public void onrangechanged(float lowerrange, float upperrange);

 }

}

在xml中

<com.zhiziyun.dmptest.bot.util.rangeseekbar
    android:id="@+id/rangeseekbar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" />

最后在代码中调用

rangeseekbar = (rangeseekbar) findviewbyid(r.id.rangeseekbar);

  rangeseekbar.setonrangechangedlistener(new rangeseekbar.onrangechangedlistener() {

   @override
   public void onrangechanged(float lowerrange, float upperrange) {
    tv_age.settext((int) lowerrange + "~" + (int) upperrange);
   }
  });

写完收工。

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。