【转】ListView与RadioButton组合——自定义单选列表

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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);
}