[add][what]增加一个泛型的序列化Callback (sample项目中有一个Json序列化的例子)

[why]避免每种类型的返回对象都需要新建相对应的Callback类

okhttputils/src/main/java/com/zhy/http/okhttp/callback/GenericsCallback.java

@@ -0,0 +1,30 @@
+package com.zhy.http.okhttp.callback;
+
+import java.io.IOException;
+import java.lang.reflect.ParameterizedType;
+
+import okhttp3.Response;
+
+/**
+ * Created by JimGong on 2016/6/23.
+ */
+
+public abstract class GenericsCallback<T> extends Callback<T> {
+    IGenericsSerializator mGenericsSerializator;
+
+    public GenericsCallback(IGenericsSerializator serializator) {
+        mGenericsSerializator = serializator;
+    }
+
+    @Override
+    public T parseNetworkResponse(Response response, int id) throws IOException {
+        String string = response.body().string();
+        Class<T> entityClass = (Class<T>) ((ParameterizedType) getClass().getGenericSuperclass()).getActualTypeArguments()[0];
+        if (entityClass == String.class) {
+            return (T) string;
+        }
+        T bean = mGenericsSerializator.transform(string, entityClass);
+        return bean;
+    }
+
+}

okhttputils/src/main/java/com/zhy/http/okhttp/callback/IGenericsSerializator.java

@@ -0,0 +1,8 @@
+package com.zhy.http.okhttp.callback;
+
+/**
+ * Created by JimGong on 2016/6/23.
+ */
+public interface IGenericsSerializator {
+    <T> T transform(String response, Class<T> classOfT);
+}

sample-okhttp/src/main/java/com/zhy/sample_okhttp/JsonGenericsSerializator.java

@@ -0,0 +1,15 @@
+package com.zhy.sample_okhttp;
+
+import com.google.gson.Gson;
+import com.zhy.http.okhttp.callback.IGenericsSerializator;
+
+/**
+ * Created by JimGong on 2016/6/23.
+ */
+public class JsonGenericsSerializator implements IGenericsSerializator {
+    Gson mGson = new Gson();
+    @Override
+    public <T> T transform(String response, Class<T> classOfT) {
+        return mGson.fromJson(response, classOfT);
+    }
+}

sample-okhttp/src/main/java/com/zhy/sample_okhttp/MainActivity.java

@@ -15,6 +15,7 @@
 import com.zhy.http.okhttp.OkHttpUtils;
 import com.zhy.http.okhttp.callback.BitmapCallback;
 import com.zhy.http.okhttp.callback.FileCallBack;
+import com.zhy.http.okhttp.callback.GenericsCallback;
 import com.zhy.http.okhttp.callback.StringCallback;
 import com.zhy.http.okhttp.cookie.CookieJarImpl;
 
@@ -156,7 +157,7 @@ public void getUser(View view)
                 .addParams("username", "hyman")//
                 .addParams("password", "123")//
                 .build()//
-                .execute(new UserCallback()
+                .execute(new GenericsCallback<User>(new JsonGenericsSerializator())
                 {
                     @Override
                     public void onError(Call call, Exception e, int id)