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);

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。

以上是 Android实现列表时间轴 的全部内容, 来源链接: utcz.com/p/240519.html

回到顶部