Android 时间轴
效果图:
数据是随便填的,显得有点乱,但是不影响效果。实现方面主要是用ListView来实现,主要是根据ListView的item位置与上一条数据进行比较,来控制时间的显示隐藏效果。思路很简单,下面看代码实现:
首先是页面的整体布局,很简单,就一个ListView:
res/layout/activity_main.xml:
<?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>
ListView的item的布局分了三部分,一个需要显示隐藏的标题栏,包括一个小圆点和一个显示时间的TextView,第二部分是展示的内容,最后是时间轴的竖线。
res/layout/item_time_line.xml:
<?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>
下面看主要的实现部分,是在listview的适配器中:
DateAdapter.java:
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; } }
其中DateText是实体类,包括标题和内容:
DateText.java:
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; } }
package com.xiaowu.timeline; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Date; public class TimeFormat { public static String format(String format, String time) { String result = ""; SimpleDateFormat df = new SimpleDateFormat("yyyyMMdd"); try { Date date = df.parse(time); SimpleDateFormat df1 = new SimpleDateFormat(format); result = df1.format(date); } catch (ParseException e) { e.printStackTrace(); } return result; } }
DateComparator.java:
package com.xiaowu.timeline; import java.util.Comparator; public class DateComparator implements Comparator<DateText> { @Override public int compare(DateText lhs, DateText rhs) { return rhs.getDate().compareTo(lhs.getDate()); } }
MainActivity.java:
package com.xiaowu.timeline; import java.util.ArrayList; import java.util.Collections; import java.util.List; import android.app.Activity; import android.os.Bundle; import android.widget.ListView; public class MainActivity extends Activity { // 时间轴列表 private ListView lvList; // 数据list private List<DateText> list; // 列表适配器 private DateAdapter adapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // findviewbyid lvList = (ListView) findViewById(R.id.lv_list); list = new ArrayList<DateText>(); // 添加测试数据 addData(); // 将数据按照时间排序 DateComparator comparator = new DateComparator(); Collections.sort(list, comparator); // listview绑定适配器 adapter = new DateAdapter(this, list); lvList.setAdapter(adapter); } private void addData() { DateText date1 = new DateText("20140710", "撒大声地"); DateText date2 = new DateText("20140709", "撒萨达"); DateText date3 = new DateText("20140726", "撒大ADS"); DateText date4 = new DateText("20140710", "撒达到对萨达撒地"); DateText date5 = new DateText("20140711", "撒大阿瑟的萨达地"); DateText date6 = new DateText("20140713", "撒撒大大地"); DateText date7 = new DateText("20140712", "撒大鼎折覆餗地"); DateText date8 = new DateText("20140714", "撒大请问阿尔阿斯顿"); DateText date9 = new DateText("20140709", "撒大亲爱额问问乔恩地"); DateText date10 = new DateText("20140705", "撒 请问请问地"); DateText date11 = new DateText("20140729", "撒请问额外确认声地"); DateText date12 = new DateText("20140725", "撒大按时打算"); DateText date13 = new DateText("20140716", "撒大爱上大声地"); DateText date14 = new DateText("20140711", "撒其味无穷地"); DateText date15 = new DateText("20140710", "撒大请问我期待地"); DateText date16 = new DateText("20140711", "撒大声萨达"); DateText date17 = new DateText("20140712", "阿斯达"); DateText date18 = new DateText("20140711", "撒大声大声道"); DateText date19 = new DateText("20140715", "阿斯顿撒打算23 "); DateText date20 = new DateText("20140723", "范德萨发生"); DateText date21 = new DateText("20140718", "阿萨德飞洒"); DateText date22 = new DateText("20140706", "撒打算打算"); DateText date23 = new DateText("20140714", "撒打算"); DateText date24 = new DateText("20140726", "轻微的城市的方式"); DateText date25 = new DateText("20140725", "阿斯达阿斯达现在"); DateText date26 = new DateText("20140723", "代购费多少自行车"); DateText date27 = new DateText("20140721", "多撒阿萨德时打算"); DateText date28 = new DateText("20140716", "爱上大声地啊地"); DateText date29 = new DateText("20140712", "阿斯蒂芬当我师傅"); DateText date30 = new DateText("20140710", "撒大声大声道"); list.add(date1); list.add(date2); list.add(date3); list.add(date4); list.add(date5); list.add(date6); list.add(date7); list.add(date8); list.add(date9); list.add(date10); list.add(date11); list.add(date12); list.add(date13); list.add(date14); list.add(date15); list.add(date16); list.add(date17); list.add(date18); list.add(date19); list.add(date20); list.add(date21); list.add(date22); list.add(date23); list.add(date24); list.add(date25); list.add(date26); list.add(date27); list.add(date28); list.add(date29); list.add(date30); } }
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