Android 时间轴

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <ListView
        android:id="@+id/lv_list"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:cacheColorHint="@null"
        android:divider="@null" >
    </ListView>

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" >

    <RelativeLayout
        android:id="@+id/rl_title"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:paddingTop="10dp" >

        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerVertical="true"
            android:layout_marginLeft="8dp"
            android:background="@drawable/img_line_point" />

        <TextView
            android:id="@+id/txt_date_time"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerVertical="true"
            android:layout_marginLeft="15dp"
            android:textColor="#FC6802" />
    </RelativeLayout>

    <TextView
        android:id="@+id/txt_date_content"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/rl_title"
        android:layout_marginLeft="15dp"
        android:paddingBottom="10dp"
        android:textColor="#5296C5" />

    <View
        android:id="@+id/v_line"
        android:layout_width="2dp"
        android:layout_height="wrap_content"
        android:layout_marginLeft="10dp"
        android:background="#FC6802" />

</RelativeLayout>

package com.xiaowu.timeline;

import java.util.List;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.RelativeLayout;
import android.widget.RelativeLayout.LayoutParams;
import android.widget.TextView;

public class DateAdapter extends BaseAdapter {
        private Context context;
        private List<DateText> list;

        public DateAdapter(Context context, List<DateText> list) {
                this.context = context;
                this.list = list;
        }

        @Override
        public int getCount() {
                if (list == null) {
                        return 0;
                }
                return list.size();
        }

        @Override
        public Object getItem(int position) {
                if (list == null) {
                        return null;
                }
                return list.get(position);
        }

        @Override
        public long getItemId(int position) {
                return position;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
                ViewHolder holder = null;
                if (convertView == null) {
                        holder = new ViewHolder();
                        convertView = LayoutInflater.from(context).inflate(
                                        R.layout.item_time_line, parent, false);
                        holder.date = (TextView) convertView
                                        .findViewById(R.id.txt_date_time);
                        holder.content = (TextView) convertView
                                        .findViewById(R.id.txt_date_content);
                        holder.line = (View) convertView.findViewById(R.id.v_line);
                        holder.title = (RelativeLayout) convertView
                                        .findViewById(R.id.rl_title);
                        convertView.setTag(holder);
                } else {
                        holder = (ViewHolder) convertView.getTag();
                }
                //时间轴竖线的layout
                LayoutParams params = (LayoutParams) holder.line.getLayoutParams();
                //第一条数据，肯定显示时间标题
                if (position == 0) {
                        holder.title.setVisibility(View.VISIBLE);
                        holder.date.setText(TimeFormat.format("yyyy.MM.dd",
                                        list.get(position).getDate()));
                        params.addRule(RelativeLayout.ALIGN_TOP, R.id.rl_title);
                        params.addRule(RelativeLayout.ALIGN_BOTTOM, R.id.txt_date_content);
                } else { // 不是第一条数据
                        // 本条数据和上一条数据的时间戳相同，时间标题不显示
                        if (list.get(position).getDate()
                                        .equals(list.get(position - 1).getDate())) {
                                holder.title.setVisibility(View.GONE);
                                params.addRule(RelativeLayout.ALIGN_TOP, R.id.txt_date_content);
                                params.addRule(RelativeLayout.ALIGN_BOTTOM,
                                                R.id.txt_date_content);
                        } else {
                                //本条数据和上一条的数据的时间戳不同的时候，显示数据
                                holder.title.setVisibility(View.VISIBLE);
                                holder.date.setText(TimeFormat.format("yyyy.MM.dd",
                                                list.get(position).getDate()));
                                params.addRule(RelativeLayout.ALIGN_TOP, R.id.rl_title);
                                params.addRule(RelativeLayout.ALIGN_BOTTOM,
                                                R.id.txt_date_content);
                        }
                }
                holder.line.setLayoutParams(params);
                holder.content.setText(list.get(position).getText());
                return convertView;
        }

        public static class ViewHolder {
                RelativeLayout title;
                View line;
                TextView date;
                TextView content;
        }
}

package com.xiaowu.timeline;

public class DateText {
        private String date;
        private String text;

        public DateText() {

        }

        public DateText(String date, String text) {
                super();
                this.date = date;
                this.text = text;
        }

        public String getDate() {
                return date;
        }

        public void setDate(String date) {
                this.date = date;
        }

        public String getText() {
                return text;
        }

        public void setText(String text) {
                this.text = text;
        }

}