【转】ListView与RadioButton组合——自定义单选列表

原文网址：http://blog.csdn.net/checkin001/article/details/11519131

Android自带的RadioButton单选框只支持添加文字，我们自己写Adapter实现自定义的RadioButton

首先item的XML源码

search_user_item.xml （现在只是文字+单选按钮+自定义背景，可以根据需要随意扩展）

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/search_user_list_item"
    android:layout_width="fill_parent"
    android:layout_height="30dp"
    android:layout_marginBottom="10dp"
    android:layout_marginTop="10dp"
    android:background="@drawable/more_item_press"
    android:gravity="center_vertical"
    android:orientation="horizontal" >

    <TextView
        android:id="@+id/search_user_name"
        android:layout_width="200dp"
        android:layout_height="wrap_content"
        android:layout_marginLeft="30dp"
        android:gravity="left"
        android:textColor="@android:color/black"
        android:textSize="16sp" />

    <RadioButton
        android:id="@+id/radio_btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="10dp" />

</LinearLayout>

Listview就是用系统自带的

<ListView
    android:id="@+id/search_user_list"
    android:layout_width="fill_parent"
    android:layout_height="200dp"
    android:layout_marginLeft="5dp"
    android:layout_marginRight="5dp"
    android:paddingBottom="5dp"
    android:cacheColorHint="@android:color/transparent"
    android:divider="@null"
    android:listSelector="@android:color/transparent"
    android:visibility="gone" >
</ListView>

再来是Adapter代码

SearchUserAdapter.java （具体改动写在代码注释里面）

package ouc.sei.suxin.android.ui.adapter;

import java.util.HashMap;
import java.util.List;

import ouc.sei.suxin.R;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.LinearLayout;
import android.widget.RadioButton;
import android.widget.TextView;

public class SearchUserAdapter extends BaseAdapter {

    private Context context;
    private List<String> userList;
    HashMap<String,Boolean> states=new HashMap<String,Boolean>();//用于记录每个RadioButton的状态，并保证只可选一个

public SearchUserAdapter(Context context, List<String> userList)
{
    this.context = context;
    this.userList= userList;
}

@Override
public int getCount() {
    return userList.size();
}

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

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

@Override
public View getView(final int position, View convertView, ViewGroup parent) {
    ViewHolder holder;
    if (convertView == null) {
        convertView = LayoutInflater.from(context).inflate(R.layout.search_user_item, null);
        holder = new ViewHolder();
        holder.background = (LinearLayout) convertView.findViewById(R.id.search_user_list_item);
        holder.userName = (TextView) convertView.findViewById(R.id.search_user_name);
        convertView.setTag(holder);
    }else{
        holder=(ViewHolder) convertView.getTag();
    }
       final RadioButton radio=(RadioButton) convertView.findViewById(R.id.radio_btn);
    holder.rdBtn = radio;

    holder.userName.setText(userList.get(position));
    //根据Item位置分配不同背景
    if(userList.size() > 0)
    {
        if(userList.size() == 1)
        {
            holder.background.setBackgroundResource(R.drawable.more_item_press);
        }
        else{
            if(position == 0){
                holder.background.setBackgroundResource(R.drawable.more_itemtop_press);
            }
            else if(position == userList.size()-1){
                holder.background.setBackgroundResource(R.drawable.more_itembottom_press);
            }
            else{
                holder.background.setBackgroundResource(R.drawable.more_itemmiddle_press);
            }
        }
    }
//当RadioButton被选中时，将其状态记录进States中，并更新其他RadioButton的状态使它们不被选中
       holder.rdBtn.setOnClickListener(new View.OnClickListener() {

           public void onClick(View v) {

               //重置，确保最多只有一项被选中
               for(String key:states.keySet()){
                   states.put(key, false);

               }
               states.put(String.valueOf(position), radio.isChecked());
               SearchUserAdapter.this.notifyDataSetChanged();
           }
       });

       boolean res=false;
       if(states.get(String.valueOf(position)) == null || states.get(String.valueOf(position))== false){
           res=false;
           states.put(String.valueOf(position), false);
       }
       else
           res = true;

       holder.rdBtn.setChecked(res);

    return convertView;
}

static class ViewHolder {
   LinearLayout background;
          TextView userName;
          RadioButton rdBtn;
}

List适配代码（与一般无异）：

adapter = new SearchUserAdapter(this, searchUserList);
searchUserLV.setAdapter(adapter);
searchUserLV.setVisibility(View.VISIBLE);
setListViewHeightBasedOnChildren(searchUserLV);

这里还根据内容动态设置了一下，具体函数如下：

public void setListViewHeightBasedOnChildren(ListView listView) {

    Adapter listAdapter = listView.getAdapter();

    if (listAdapter == null) {
        return;
    }

    int totalHeight = 0;
    int viewCount = listAdapter.getCount();
    for (int i = 0; i < viewCount; i++) {
        View listItem = listAdapter.getView(i, null, listView);
        listItem.measure(0, 0);
        totalHeight += listItem.getMeasuredHeight();
    }

    ViewGroup.LayoutParams params = listView.getLayoutParams();

    params.height = totalHeight
            + (listView.getDividerHeight() * (listAdapter.getCount()-1)) + 10;//加10是为了适配自定义背景

    listView.setLayoutParams(params);
}

当需要获取ListView中RadioButton的选择状态时，可以直接看Adapter中的states，具体如下：

// 根据RadioButton的选择情况确定用户名
for (int i = 0, j = searchUserLV.getCount(); i < j; i++) {
    View child = searchUserLV.getChildAt(i);
    RadioButton rdoBtn = (RadioButton) child
            .findViewById(R.id.radio_btn);
    if (rdoBtn.isChecked())
        searchUser = searchUserList.get(i);
}

这里的searchUserList是调用后台服务获取的用户名列表，通过states获取选中用户名进行后续操作

效果图：

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