android项目解刨之时间轴

2015/04/29 00:39
阅读数 337

    最近开发的app中要用到时间轴这东西,需要实现的效果如下:


想想这个东西应该可以用listview实现吧。然后最近就模拟着去写了:

首先写  listview的item的布局: 

listview_item.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="match_parent"
    android:background="#ffffff"
    android:orientation="vertical"
    android:paddingRight="20dp" >


    <View
        android:id="@+id/view_0"
        android:layout_width="1dp"
        android:layout_height="25dp"
        android:layout_below="@+id/layout_1"
        android:layout_marginLeft="71dp"
        android:background="#A6A6A6" />

    <View
        android:id="@+id/view_1"
        android:layout_width="1dp"
        android:layout_height="25dp"
        android:layout_below="@+id/layout_2"
        android:layout_marginLeft="71dp"
        android:background="#A6A6A6" />

    <TextView
        android:id="@+id/show_time"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/view_1"
        android:layout_marginLeft="30dp"
        android:text="测试数据"
        android:textSize="12dp" />

    <ImageView
        android:id="@+id/image"
        android:layout_width="15dp"
        android:layout_height="15dp"
        android:layout_below="@+id/view_1"
        android:layout_marginLeft="65dp"
        android:src="@drawable/timeline_green" />

    <View
        android:id="@+id/view_2"
        android:layout_width="1dp"
        android:layout_height="100dp"
        android:layout_below="@+id/image"
        android:layout_marginLeft="71dp"
        android:background="#A6A6A6" />

    <RelativeLayout
        android:id="@+id/relative"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/image"
        android:layout_marginTop="-20dp"
        android:layout_toRightOf="@+id/image"
        android:background="@drawable/timeline_content"
        android:padding="10dp" >

        <ImageView
            android:id="@+id/image_1"
            android:layout_width="60dp"
            android:layout_height="60dp"
            android:layout_alignParentLeft="true"
            android:layout_centerVertical="true"
            android:layout_marginLeft="5dp"
            android:src="@drawable/bg_green_circle_smic" />

        <TextView
            android:id="@+id/title"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerHorizontal="true"
            android:layout_centerVertical="true"
            android:ellipsize="end"
            android:maxEms="7"
            android:paddingLeft="5dp"
            android:singleLine="true"
            android:text="测试数据"
            android:textSize="12sp" />

    </RelativeLayout>

</RelativeLayout>

接下来就是写listview的adapter了:

TimelineAdapter.java

package com.example.timelinetext.test;

import java.util.List;
import java.util.Map;

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

public class TimelineAdapter extends BaseAdapter {

	private Context context;
	private List<Map<String, Object>> list;
	private LayoutInflater inflater;

	public TimelineAdapter(Context context, List<Map<String, Object>> list) {
		super();
		this.context = context;
		this.list = list;
	}

	@Override
	public int getCount() {

		return list.size();
	}

	@Override
	public Object getItem(int position) {
		return position;
	}

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

	@Override
	public View getView(int position, View convertView, ViewGroup parent) {
		ViewHolder viewHolder = null;
		if (convertView == null) {
			inflater = LayoutInflater.from(parent.getContext());
			convertView = inflater.inflate(R.layout.listview_item, null);
			viewHolder = new ViewHolder();

			viewHolder.title = (TextView) convertView.findViewById(R.id.title);
			convertView.setTag(viewHolder);
		} else {
			viewHolder = (ViewHolder) convertView.getTag();
		}
		
		String titleStr = list.get(position).get("title").toString();
		
	
		viewHolder.title.setText(titleStr);

		return convertView;
	}

	static class ViewHolder {
		public TextView year;
		public TextView month;
		public TextView title;
	}
}


最后使用:

MainActivity.java

package com.example.timelinetext.test;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import android.app.Activity;
import android.os.Bundle;
import android.widget.ListView;

public class MainActivity extends Activity {

	private ListView listView;
	List<String> data ;
	private TimelineAdapter timelineAdapter;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_listview);

		listView = (ListView) this.findViewById(R.id.listview);
		listView.setDividerHeight(0);
		timelineAdapter = new TimelineAdapter(this, getData());
		listView.setAdapter(timelineAdapter);

	}

	private List<Map<String, Object>> getData() {
		List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();

		Map<String, Object> map = new HashMap<String, Object>();
		map.put("title", "这是第1行测试数据");
		list.add(map);

		map = new HashMap<String, Object>();
		map.put("title", "这是第2行测试数据");
		list.add(map);

		map = new HashMap<String, Object>();
		map.put("title", "这是第3行测试数据");
		list.add(map);

		map = new HashMap<String, Object>();
		map.put("title", "这是第4行测试数据");
		list.add(map);
		return list;
	}

}

运行效果如图:




所以模拟着去写一个时间轴,并不是什么复杂的事情,不要被UI设计的图片吓到,其实他就是一个普通的listview而已。



源码下载


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大神能给讲解下View这个控件吗?
2016/04/15 13:37
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