类似于选择城市相同的首字母放在一起的效果

1.类似效果如下：



2.实现效果如下（时间有限完成的一般）：



3.上代码
3.1 ListViewTest.java
[java] view plaincopyprint?

import java.util.ArrayList;
import java.util.HashMap;

import android.app.Activity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;

public class ListViewTest extends Activity{

private ListView list;
private ArrayList<HashMap<String, String>> data = new ArrayList<HashMap<String,String>>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.listview);
init();
}

private void init()
{
list = (ListView)findViewById(R.id.listView1);
/**
* 获取数据时应该把相同flag的数据放在一起
* 不同的放在前面
*/
HashMap< String, String> map;

map = new HashMap<String, String>();
map.put("name", "测试数据A");
map.put("flag", "flag");
data.add(map);

map = new HashMap<String, String>();
map.put("name", "测试数据B");
map.put("flag", "flag");
data.add(map);

map = new HashMap<String, String>();
map.put("name", "测试数据C");
map.put("flag", "flag");
data.add(map);

map = new HashMap<String, String>();
map.put("name", "测试数据D");
map.put("flag", "flag");
data.add(map);

for(int i = 0; i<20; i++)
{
map = new HashMap<String, String>();
map.put("name", "测试数据"+i);
map.put("flag", "flag"+i/5);
data.add(map);
}
int length = data.size();
String flag = "";
for(int i=0; i<length; i++){//flag 处理
if((i<length-1)&&!flag.equals(data.get(i+1).get("flag").replace("flag", "")))
{
flag = data.get(i+1).get("flag").replace("flag", "");
data.get(i).put("flag", flag);
}else{
data.get(i).put("flag", "flag");
}
}
list.setCacheColorHint(0);
list.setAdapter(new Adapter());

}

class Adapter extends BaseAdapter
{
@Override
public int getCount() {
return data.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) {
LayoutInflater inflater = (LayoutInflater)getSystemService(LAYOUT_INFLATER_SERVICE);
View view = inflater.inflate(R.layout.listview_item, null);

TextView name = (TextView)view.findViewById(R.id.name);
name.setText(data.get(position).get("name"));

if(!"flag".equals(data.get(position).get("flag")))
{
TextView flag_name = (TextView) view.findViewById(R.id.flag_name);
TextView flag = (TextView) view.findViewById(R.id.flag);
LinearLayout line = (LinearLayout) view.findViewById(R.id.line);

flag_name.setText(data.get(position).get("flag"));
flag.setText(data.get(position).get("flag").replace("flag", ""));

line.setVisibility(View.VISIBLE);
flag_name.setVisibility(View.VISIBLE);
flag.setVisibility(View.VISIBLE);
}
return view;
}
}
}

3.2 listview.xml
[java] view plaincopyprint?

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

<ListView
android:id="@+id/listView1"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</ListView>
</LinearLayout>

3.3listview_item.xml
[java] view plaincopyprint?

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="100dip"
android:background="#ffffff"
android:orientation="horizontal" >

<TextView
android:id="@+id/name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:text="name" />

<TextView
android:id="@+id/flag_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/name"
android:text="flag_name"
android:visibility="invisible" />

<TextView
android:id="@+id/flag"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/name"
android:text="flag"
android:layout_alignParentRight="true"
android:visibility="invisible"/>

<LinearLayout
android:id="@+id/line"
android:layout_width="fill_parent"
android:layout_height="2dip"
android:layout_alignParentBottom="true"
android:background="#ff0000"
android:visibility="invisible" >
</LinearLayout>

</RelativeLayout>

这只是个demo如有其它需求可以根据这个思路 自己修改-.-。