1、配置应用访问网络权限，参考：

Android java.net.SocketException: Permission denied

2、服务器端用php实现，代码如下：

<?php
	$zhike = array(
		'id' => 'zhike',
		'title' => '止咳推拿',
		'content' => 'zhikezhikezhike'
	);

	$list = array();
	
	array_push($list,$zhike);

	echo json_encode($list);
?>

3、客户端代码：

public List<Map<String,Object>> getList() throws Exception{
	List<Map<String,Object>> list = new ArrayList<Map<String,Object>>();
	Map<String, Object> item = null;
	
	StringBuilder builder = new StringBuilder();
	
	HttpClient client = new DefaultHttpClient();
	HttpGet get = new HttpGet(url);
	
	HttpResponse response = client.execute(get);
	BufferedReader reader = new BufferedReader(
			new InputStreamReader(response.getEntity().getContent()));
	String s = null;
	while((s = reader.readLine()) != null){
		builder.append(s);
	}
	
	JSONArray ja = new JSONArray(builder.toString());
	Log.i("---my tag---", ja.toString());
	
	JSONObject joItem = null;
	for (int i = 0; i < ja.length(); i++) {
		joItem = ja.getJSONObject(i);
		item = new HashMap<String, Object>();
		item.put("id", joItem.getString("id"));
		item.put("title", joItem.getString("title"));
		item.put("content", joItem.getString("content"));
		list.add(item);
	}
	
	return list;
}