Android实现列表时间轴

本文实例为大家分享了Android列表时间轴展示的具体代码，供大家参考，具体内容如下

实现的效果图如下:

实现的方式是利用recycleview的ItemDecoration这个抽象类,就是我们经常用来画分割线的的这个类,
具体如下

public class DividerItemDecoration extends RecyclerView.ItemDecoration{
// 写右边字的画笔(具体信息)
private Paint mPaint;

// 写左边日期字的画笔( 时间 + 日期)
private Paint mPaint1;
private Paint mPaint2;
private Paint mPaint3;

// 左 上偏移长度
private int itemView_leftinterval;
private int itemView_topinterval;

// 轴点半径
private int circle_radius;

// 图标
private Bitmap mIcon;
//月份合集(使用时需要设置)
private List<String> monthList= new ArrayList<>();
//年份合集(使用时需要设置)
private List<String> yearList= new ArrayList<>();

public void setMonthList(List<String> monthList) {
 this.monthList = monthList;
}

public void setYearList(List<String> yearList) {
 this.yearList = yearList;
}

// 在构造函数里进行绘制的初始化，如画笔属性设置等
public DividerItemDecoration(Context context) {

// 轴点画笔(红色)
 mPaint = new Paint();
 mPaint.setColor(Color.rgb(58, 154, 239));
 mPaint.setStyle(Paint.Style.STROKE);
 mPaint.setStrokeWidth(3);
 // 左边时间文本画笔(蓝色)
 // 此处设置了两只分别设置 时分 & 年月
 mPaint1 = new Paint();
 mPaint1.setColor(Color.BLACK);
 mPaint1.setTextSize(30);

mPaint2 = new Paint();
 mPaint2.setColor(context.getResources().getColor(R.color.divider));
 mPaint2.setTextSize(26);

mPaint3 = new Paint();
 mPaint3.setColor(Color.rgb(58, 154, 239));
 mPaint3.setTextSize(20);

// 赋值ItemView的左偏移长
 itemView_leftinterval = 150;

// 赋值ItemView的上偏移长度
 itemView_topinterval = 30;

// 赋值轴点圆的半径为10
 circle_radius = 8;

}

// 重写getItemOffsets（）方法
// 作用：设置ItemView 左 & 上偏移长度
@Override
public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
 super.getItemOffsets(outRect, view, parent, state);

// 设置ItemView的左 & 上偏移长度分别为150 px & 30px,即此为onDraw()可绘制的区域
 outRect.set(itemView_leftinterval, itemView_topinterval, 0, 0);

}

// 重写onDraw（）
// 作用:在间隔区域里绘制时光轴线 & 时间文本
@Override
public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
 super.onDraw(c, parent, state);
 // 获取RecyclerView的Child view的个数
 int childCount = parent.getChildCount();

// 遍历每个Item，分别获取它们的位置信息，然后再绘制对应的分割线
 for (int i = 0; i < childCount; i++) {

// 获取每个Item对象
  View child = parent.getChildAt(i);
  View lastChild = null;
  if (i > 0) {

lastChild = parent.getChildAt(i - 1);
  }

/**
   * 绘制轴点
   */
  // 轴点 = 圆 = 圆心(x,y) 位置可以根据需求来调节
  float centerx = child.getLeft() - itemView_leftinterval / 4;
  float centery = child.getTop() + itemView_topinterval +10;
  // 绘制轴点圆
  c.drawCircle(centerx, centery, circle_radius, mPaint);

/**
   * 绘制上半轴线(x轴是保持不变的)
   */
  // 上端点坐标(x,y)
  float upLine_up_x = centerx;
  float upLine_up_y = 0;
  if (i>0){
    upLine_up_y = lastChild.getBottom();
  }else {
    upLine_up_y = centery - itemView_topinterval;
  }

// 下端点坐标(x,y)
  float upLine_bottom_x = centerx;
  float upLine_bottom_y = centery - circle_radius;

//绘制上半部轴线
  c.drawLine(upLine_up_x, upLine_up_y, upLine_bottom_x, upLine_bottom_y, mPaint);

/**
   * 绘制下半轴线,最后一个不画下半轴
   */
  if (i <childCount-1){
   // 上端点坐标(x,y)
   float bottomLine_up_x = centerx;
   float bottom_up_y = centery + circle_radius;

// 下端点坐标(x,y)
   float bottomLine_bottom_x = centerx;
   float bottomLine_bottom_y = child.getBottom();

//绘制下半部轴线
   c.drawLine(bottomLine_up_x, bottom_up_y, bottomLine_bottom_x, bottomLine_bottom_y, mPaint);
  }

/**
   * 绘制左边时间文本
   */
  // 获取每个Item的位置
  int index = parent.getChildAdapterPosition(child);
  // 设置文本起始坐标
  float Text_x = child.getLeft() - itemView_leftinterval * 5 / 6;
  float Text_y = upLine_bottom_y;

// 根据Item位置设置时间文本
  switch (index) {
   case (0):
    // 设置日期绘制位置

c.drawText(monthList.get(0), Text_x, Text_y, mPaint1);
    c.drawText(yearList.get(0), Text_x + 8, Text_y + 28, mPaint2);
    break;
   case (1):
    // 设置日期绘制位置
    c.drawText(monthList.get(1), Text_x, Text_y, mPaint1);
    c.drawText(yearList.get(1), Text_x + 8, Text_y + 28, mPaint2);
    break;
   case (2):
    // 设置日期绘制位置
    if (TextUtils.isEmpty(yearList.get(2))){
     c.drawText(monthList.get(2), Text_x, Text_y, mPaint3);
    }else {
     c.drawText(monthList.get(2), Text_x, Text_y, mPaint1);
     c.drawText(yearList.get(2), Text_x + 8, Text_y + 28, mPaint2);
    }
    break;
   case (3):
    // 设置日期绘制位置
    c.drawText(monthList.get(3), Text_x, Text_y, mPaint1);
    c.drawText(yearList.get(3), Text_x + 8, Text_y + 28, mPaint2);
    break;
   case (4):
    // 设置日期绘制位置
    c.drawText(monthList.get(4), Text_x, Text_y, mPaint1);
    c.drawText(yearList.get(4), Text_x + 8, Text_y + 28, mPaint2);
    break;
   default:c.drawText("结束", Text_x, Text_y, mPaint1);
  }
 }
}

}

使用比较简单:

DividerItemDecoration dividerItemDecoration = new DividerItemDecoration(this);
 dividerItemDecoration.setMonthList(monthList);
 dividerItemDecoration.setYearList(yearList);
 mRecyclerView.addItemDecoration(dividerItemDecoration);

来源：https://blog.csdn.net/sinat_35670989/article/details/79591728