android 解析 JSON 数据

String xx = "{calendar :{ DataTable:[ { W_TYPE:'合同订立',W_ACTIVITYNAME:'采购合同1，由人力资源部许某承办',W_URL:'http://192.168.51.99/.aspx?TaskID=47eb4557-64fb-462f-810e',W_USER:'李永'}]}}";
					
		List<String> W_TYPE = new ArrayList<String>();
		List<String> W_ACTIVITYNAME = new ArrayList<String>();
		List<String> W_URL = new ArrayList<String>();
		List<String> W_USER = new ArrayList<String>();
try {
			JSONObject jsonObject = new JSONObject(xx) 
            .getJSONObject("calendar");
			JSONArray array = jsonObject.getJSONArray("DataTable");
			for(int j = 0 ; j < array.length() ; j++){
				JSONObject jsonObject2 = (JSONObject)array.opt(j); 
				W_TYPE.add(jsonObject2.getString("W_TYPE"));
				W_ACTIVITYNAME.add(jsonObject2.getString("W_ACTIVITYNAME"));
				W_URL.add(jsonObject2.getString("W_URL"));
				W_USER.add(jsonObject2.getString("W_USER"));
				
			}
		} catch (JSONException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}