---------------------OkhttpUtils------------------------------

package com.ztz.mvpshopcart.okhttp;

import java.io.File;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import okhttp3.FormBody;
import okhttp3.MediaType;
import okhttp3.MultipartBody;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;

/**
 * Created by tr on 17/11/10.
 *
 * Okhttp 單例 範型的封裝
 */

public class OkhttpUtils {

    private static OkhttpUtils okhttpUtils = null ;

    private OkhttpUtils(){

    }

    public static OkhttpUtils getInstance(){

        if(okhttpUtils == null){
            okhttpUtils = new OkhttpUtils();
            client = new OkHttpClient.Builder()
                    .readTimeout(20, TimeUnit.SECONDS)
                    .writeTimeout(20,TimeUnit.SECONDS)
                    .connectTimeout(20,TimeUnit.SECONDS)
                    //新增攔截器
                    .addInterceptor(new LoggingInterceptor())
                    .build();
        }
        return okhttpUtils ;

    }
    private static OkHttpClient client ;

    /**
     * 發起非同步請求
     * @param params
     * @param url
     * @param callBack
     */
    public void asy(Map<String,String> params,String url,AbstractUiCallBack callBack){
        Request request = null ;

        if(params != null){
            // post 請求
            FormBody.Builder builder = new FormBody.Builder() ;
            for(Map.Entry<String,String> entry : params.entrySet()){
                builder.add(entry.getKey(),entry.getValue());
            }
            FormBody body =  builder.build();
            request = new Request.Builder()
                    .url(url)
                    .post(body)
                    .build();
        } else {
            // get 請求 --需要加請求頭可以在下方加

            request = new Request.Builder()

                    .url(url)
                    .build();
        }

        client.newCall(request).enqueue(callBack);

    }

    private static final MediaType MEDIA_TYPE_PNG = MediaType.parse("image/png");

    public static void postFile(Map<String,String> map, String url, File file,AbstractUiCallBack callBack){

        String [] array =  file.getAbsolutePath().split("\\/");

        MultipartBody.Builder builder = new MultipartBody.Builder();
        builder.setType(MultipartBody.FORM);

        for(Map.Entry<String,String> entry : map.entrySet()){
            builder.addFormDataPart(entry.getKey(),entry.getValue());
        }
        builder.addFormDataPart("imageFileName",array[array.length-1]);


        if(file.exists() && file.length() > 0){
            builder.addFormDataPart("image",array[array.length-1], RequestBody.create(MEDIA_TYPE_PNG,file));
        }
        MultipartBody body =  builder.build() ;

        Request request = new Request.Builder()
                .url(url)
                .post(body)
                .build();
        client.newCall(request).enqueue(callBack);
    }
}

---------------------AbstractUiCallBack------------------------------

package com.ztz.mvpshopcart.okhttp;

import android.os.Handler;
import android.os.Looper;

import com.google.gson.Gson;
import com.google.gson.JsonSyntaxException;

import java.io.IOException;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;

import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.Response;

/**
 * Created by tr on 17/11/10.
 *
 *  * Okhttp 單例 範型的封裝
 */

public  abstract  class AbstractUiCallBack<T> implements Callback {

    /**
     * 成功回撥
     * @param t
     */
    public abstract void success(T t);

    /**
     * 失敗回撥
     * @param e
     */
    public abstract void failure(Exception e);


    private Handler handler = null ;
    private Class clazz ;

    public AbstractUiCallBack(){
        handler = new Handler(Looper.getMainLooper());


        //  得到的是一個 AbstractUiCallBack<T> 的Type
       Type type =  getClass().getGenericSuperclass() ;

        // 得到的是T的實際Type
       Type [] arr =  ((ParameterizedType)type).getActualTypeArguments() ;

        clazz = (Class) arr[0] ;



    }




    @Override
    public void onFailure(Call call, IOException e) {

        failure(e);

    }

    @Override
    public void onResponse(Call call, Response response) throws IOException {


        try {
            String result = response.body().string();
            System.out.println("result = " + result);
            Gson gson = new Gson();

            final T t = (T) gson.fromJson(result,clazz);

            handler.post(new Runnable() {
                @Override
                public void run() {
                    success(t);
                }
            });
        } catch (IOException e) {
            e.printStackTrace();
            failure(e);
        } catch (JsonSyntaxException e) {
            e.printStackTrace();
            failure(e);
        }


    }
}

-------------------------------攔截器--------------------------------

package com.ztz.mvpshopcart.okhttp;

import java.io.IOException;

import okhttp3.FormBody;
import okhttp3.Interceptor;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;

/**
 * 可以實現 新增公共請求引數
 */
public class LoggingInterceptor implements Interceptor {


  @Override public Response intercept(Chain chain) throws IOException {
    //首先取到Request
    Request request = chain.request();
    Response response = null;
    Request requestProcess = null ;
    if("GET".equals(request.method())){
      String url =  request.url().toString() + "&source=android";
      Request.Builder builder =  request.newBuilder() ;
      builder.get().url(url);
      requestProcess =  builder.build();
      response = chain.proceed(requestProcess);
    } else {
      FormBody.Builder builder = new FormBody.Builder() ;
      RequestBody requestBody =  request.body() ;
      if(requestBody instanceof FormBody){
        FormBody formBody = (FormBody)requestBody ;
        for (int i=0;i<formBody.size();i++){
          builder.add(formBody.encodedName(i),formBody.encodedValue(i));
        }
        builder.add("source","android");
      }
       requestProcess =  request.newBuilder().url(request.url().toString()).post(builder.build()).build() ;
      response = chain.proceed(requestProcess);
    }
    return response;
  }
}