Android OKHTTP的单例和再封装的实例
/** * Created by zm on 16-2-1 * okhttp的再封装,对于2.x版本，3.x版本将原有对okhttpclient配置 * 改成了builder模式配 * 置,对于超时、代理、dns，okhttp已经做好了配置， * 若不需要特殊配置，可以跳过 */ public class OkHttpUtil { private static OkHttpClient singleton; //非常有必要，要不此类还是可以被new，但是无法避免反射，好恶心 private OkHttpUtil(){ } public static OkHttpClient getInstance() { if (singleton == null) { synchronized (OkHttpUtil.class) { if (singleton == null) { singleton = new OkHttpClient(); } } } return singleton; } }
之前在看okhttp源码的时候，发现square没有对okhttpclient进行单例，网上也没找到合适的解释，以下是自己的猜测
优点：使用单例模式，避免了多次创建所产生的垃圾
缺点：对于一些特殊需求的代码进行一些灵活的配置，单例模式难以实现
总结：做为优秀的开源框架，square出发点是让用户更好更灵活的使用和扩展，从用户角度来说，对于不需要多次配置的项目，可以手动写一个单例模式，便于内存的高效利用
/** * okhttp再次封装 * Created by zm on 16-2-1 * update by zm on 16-3-19 增加Builder，方便以后内容或者字段的扩展 * */ public class HttpTools { private Context context; private final RequestParams req; private final Handler handler; public HttpTools(Builder builder) { // TODO Auto-generated constructor stub context = builder.context; req = builder.req; handler = builder.handler; } public static class Builder { private final RequestParams req; private final Context context; private final Handler handler; public Builder(RequestParams req, Context mContext, Handler handler) { // TODO Auto-generated constructor stub this.req = req; this.context = mContext; this.handler = handler; } public HttpTools build() { return new HttpTools(this); } } public void requestBuilder() { // TODO Auto-generated method stub if(req==null||context==null||handler==null){ throw new NullPointerException("NullPointerException"); } requestGet(req, context, handler); } private static void parse(Call call, final Handler handler, final RequestParams req) { // 请求加入调度 call.enqueue(new Callback() { @Override public void onResponse(Call call, Response response) throws IOException { // TODO Auto-generated method stub String result = response.body().string(); if (result != null) { Message message = Message.obtain(); message.obj = result; message.what = req.getSuccessMsgWhat(); handler.sendMessage(message); } } @Override public void onFailure(Call call, IOException e) { // TODO Auto-generated method stub handler.sendEmptyMessage(req.getFailMsgWhat()); } }); } /** * * @param req * @param context * @param handler * * get请求 */ public static void requestGet(final RequestParams req, final Context context, final Handler handler) { // 创建一个Request final Request request = new Request.Builder().url(req.getRequestUrl()).build(); Call call = OkHttpUtil.getInstance().newCall(request); parse(call, handler, req); } /** * post请求 */ public static void requestPost(final RequestParams req, final Context context, final Handler handler) { FormBody.Builder builder = new FormBody.Builder(); //此处是对RequestParams的遍历，RequestParams类省略 for (Map.Entry<String, Object> mEntry : req.getParamEntry()) { String mEntryKey = mEntry.getKey(); Object mEntryValue = mEntry.getValue(); if (TextUtils.isEmpty(mEntryKey)) { continue; } builder.add(mEntryKey, mEntryValue.toString()); } RequestBody body = builder.build(); Request request = new Request.Builder().url(req.getUrl()).post(body).build(); Call call = OkHttpUtil.getInstance().newCall(request); parse(call, handler, req); } /** * 数据请求的集中管理，方便以后一键替换，从get到post */ public static void request(RequestParams req, Context mContext, Handler handler) { // TODO Auto-generated method stub requestGet(req, mContext, handler); } }
最后再奉献上一个封装类
/** * * Created by zm on 16-2-1 * 基于Gson的json转model封装类 * */ public class JsonToModel { private static String info = "info"; public static String getInfo() { return info; } public static void setInfo(String info) { JsonToModel.info = info; } /** * * @param msg * @param t * model类 * @param model * model对象 * @return */ public static <T> List<T> getJsonArrayToModel(Message msg, Class<T> t, T model) { // TODO Auto-generated method stub List<T> list = new ArrayList<T>(); try { JSONObject json = new JSONObject(msg.obj.toString()); for (int i = 0; i < json.getJSONArray(getInfo()).length(); i++) { model = GsonHelper.toType(json.getJSONArray(getInfo()).get(i).toString(), t); list.add(model); } return list; } catch (Exception e) { // TODO Auto-generated catch block Log.e("getJsonArrayToModel", "error"); e.printStackTrace(); } return null; } }
json转model的这个类中，当时没考虑到过多性能的问题，在此类中即使用了org.json.JSONObject也使用了gson，此处还可以做出相应的优化
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