Android网络层与数据层设计

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前言

Android数据层就是数据模型,如果只是随便解析,返回到视图层,那只会代码繁重、维护难、扩展性差,所以一个好解析器设计,会减少开发成本和维护。

前面有讲过一个网络申请回来会回传给一个AsyncHttpResponseHandler,成功和失败会有方法,代码如下:

public class BaseHttpHandler extends AsyncHttpResponseHandler {private HttpCallback response;public int messageID1;public int messageID2;public BaseHttpHandler(HttpCallback response) {this.response = response;}@Overridepublic void onFinish() {super.onFinish();}@Overridepublic void onSuccess(HttpEntity content, int reqType) {super.onSuccess(content, reqType);if (response!= null) {try {Log.i("HU","handle==content="+content);BaseEntity entity=JsonPaserFactory.paserObj(content, reqType);response.onSuccess(EntityUtils.toString(content), entity, reqType);} catch (ParseException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}@Overridepublic void onFailure(Throwable error, String content, int reqType) {super.onFailure(error, content, reqType);if (response != null) {response.onFailure(error, content, reqType);}}}
大家有注意这行代码:

BaseEntity entity=JsonPaserFactory.paserObj(content,reqType);此处就是统一解析器,把解析好的数据模型,通过下面这行代码返回业务层:

<span style="white-space:pre"></span>response.onSuccess(EntityUtils.toString(content), entity, reqType);
  大家看到两个类JsonPaserFactory和BaseEntity,JsonPaserFactory工厂解析类,当某一个功能完成后,回来会传给一个类型,然后JsonPaserFactory会返回好数据模型,代码如下:

public class JsonPaserFactory {public static BaseEntity paserObj(String s, int type) {if (s == null || s.trim().toString().equals(""))return null;<span style="color:#ff0000;">BaseEntity entity = (BaseEntity) BaseApplication.httpRes.getPaser(type);</span>try {<span style="color:#ff0000;">entity.paser(s);</span>} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}return entity;}public static BaseEntity paserObj(HttpEntity en, int type) {BaseEntity entity = null;if (en != null) {try {entity = paserObj(EntityUtils.toString(en), type);} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}return entity;}}

 首先解析数据类要有个基础类,所有数据类都应该继承父类,就跟设计模式里面工厂模式一样,用户不需要知道每一个具体操作,外面统一会指向每个模块。

   

/** * 解析实体类 基类 * @author apple_hsp * */public abstract class BaseEntity {public final static String KEY_RESULT="result";public final static String KEY_LIST="list";public final static String KEY_DATE="date";public final static String KEY_NAME="name";public final static String KEY_DESC="desc";public final static String KEY_DATA="data";public  abstract void paser(String data) throws Exception ;public String err;public static  void paserKeys(JSONArray arr,LinkedHashMap<String, String> map)throws Exception{JSONArray keys=arr.getJSONArray(0);JSONArray values=arr.getJSONArray(1);int size =keys.length();for(int i=0;i<size;i++){map.put(keys.getString(i), values.getString(i));}}}

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