商城之OKHttp的简单封装

1.OkHttpHelper

package cniao5.com.cniao5shop.http;

import android.os.Handler;
import android.os.Looper;
import android.util.Log;

import com.google.gson.Gson;
import com.google.gson.JsonParseException;
import com.squareup.okhttp.Callback;
import com.squareup.okhttp.FormEncodingBuilder;
import com.squareup.okhttp.OkHttpClient;
import com.squareup.okhttp.Request;
import com.squareup.okhttp.RequestBody;
import com.squareup.okhttp.Response;

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



public class OkHttpHelper {






        public static final String TAG="OkHttpHelper";

        private  static  OkHttpHelper mInstance;
        private OkHttpClient mHttpClient;
        private Gson mGson;

        private Handler mHandler;



        static {
            mInstance = new OkHttpHelper();
        }

        private OkHttpHelper(){

            mHttpClient = new OkHttpClient();
            mHttpClient.setConnectTimeout(10, TimeUnit.SECONDS);
            mHttpClient.setReadTimeout(10,TimeUnit.SECONDS);
            mHttpClient.setWriteTimeout(30,TimeUnit.SECONDS);

            mGson = new Gson();

            mHandler = new Handler(Looper.getMainLooper());

        };

        public static  OkHttpHelper getInstance(){
            return  mInstance;
        }




        public void get(String url,BaseCallback callback){


            Request request = buildGetRequest(url);

            request(request,callback);

        }


        public void post(String url,Map<String,String> param, BaseCallback callback){

            Request request = buildPostRequest(url,param);
            request(request,callback);
        }





        public  void request(final Request request,final  BaseCallback callback){

            callback.onBeforeRequest(request);

            mHttpClient.newCall(request).enqueue(new Callback() {

                @Override
                public void onFailure(Request request, IOException e) {
                    callback.onFailure(request,e);

                }

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

                    callback.onResponse(response);

                    if(response.isSuccessful()) {

                        String resultStr = response.body().string();

                        Log.d(TAG, "result=" + resultStr);

                        if (callback.mType == String.class){
                            callbackSuccess(callback,response,resultStr);
                        }
                        else {
                            try {

                                Object obj = mGson.fromJson(resultStr, callback.mType);
                                callbackSuccess(callback,response,obj);
                            }
                            catch (com.google.gson.JsonParseException e){ // Json解析的错误
                                callback.onError(response,response.code(),e);
                            }
                        }
                    }
                    else {
                        callbackError(callback,response,null);
                    }

                }
            });


        }


        private void callbackSuccess(final  BaseCallback callback , final Response response, final Object obj ){
            //变为主线程
            mHandler.post(new Runnable() {
                @Override
                public void run() {
                    callback.onSuccess(response, obj);
                }
            });
        }


        private void callbackError(final  BaseCallback callback , final Response response, final Exception e ){

            mHandler.post(new Runnable() {
                @Override
                public void run() {
                    callback.onError(response,response.code(),e);
                }
            });
        }



        private  Request buildPostRequest(String url,Map<String,String> params){

            return  buildRequest(url,HttpMethodType.POST,params);
        }

        private  Request buildGetRequest(String url){

            return  buildRequest(url,HttpMethodType.GET,null);
        }
		
        //构建Request对象 区分POST和GET
        private  Request buildRequest(String url,HttpMethodType methodType,Map<String,String> params){


            Request.Builder builder = new Request.Builder()
                    .url(url);

            if (methodType == HttpMethodType.POST){
                RequestBody body = builderFormData(params);
                builder.post(body);
            }
            else if(methodType == HttpMethodType.GET){
                builder.get();
            }


            return builder.build();
        }



		
        private RequestBody builderFormData(Map<String,String> params){


            FormEncodingBuilder builder = new FormEncodingBuilder();

            if(params !=null){

                for (Map.Entry<String,String> entry :params.entrySet() ){

                    builder.add(entry.getKey(),entry.getValue());
                }
            }

            return  builder.build();

        }



        enum  HttpMethodType{

            GET,
            POST,

        }



}

2.回调(不含对话框)

package cniao5.com.cniao5shop.http;

import com.google.gson.internal.$Gson$Types;
import com.squareup.okhttp.Request;
import com.squareup.okhttp.Response;

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



public abstract class BaseCallback <T> {


    public   Type mType;

	//把T转换成Type
    static Type getSuperclassTypeParameter(Class<?> subclass)
    {
        Type superclass = subclass.getGenericSuperclass();
        if (superclass instanceof Class)
        {
            throw new RuntimeException("Missing type parameter.");
        }
        ParameterizedType parameterized = (ParameterizedType) superclass;
        return $Gson$Types.canonicalize(parameterized.getActualTypeArguments()[0]);
    }


    public BaseCallback()
    {
        mType = getSuperclassTypeParameter(getClass());
    }



    public  abstract void onBeforeRequest(Request request);


    public abstract  void onFailure(Request request, Exception e) ;


    /**
     *请求成功时调用此方法
     * @param response
     */
    public abstract  void onResponse(Response response);

    /**
     *
     * 状态码大于200，小于300 时调用此方法
     * @param response
     * @param t
     * @throws IOException
     */
    public abstract void onSuccess(Response response,T t) ;

    /**
     * 状态码400，404，403，500等时调用此方法
     * @param response
     * @param code
     * @param e
     */
    public abstract void onError(Response response, int code,Exception e) ;

}

3.回调(含对话框)-----继承BaseCallBack

使用的对话框：spots-dialog     ：github         

compile 'com.github.d-max:spots-dialog:0.4@aar'

package cniao5.com.cniao5shop.http;

import android.content.Context;
import com.squareup.okhttp.Request;
import com.squareup.okhttp.Response;


import dmax.dialog.SpotsDialog;

//含有对话框的Callback
public abstract class SpotsCallBack<T> extends BaseCallback<T> {


    private  Context mContext;

    private  SpotsDialog mDialog;

    public SpotsCallBack(Context context){

        mContext = context;

        initSpotsDialog();
    }



    private  void initSpotsDialog(){

        mDialog = new SpotsDialog(mContext,"拼命加载中...");

    }

    public  void showDialog(){
        mDialog.show();
    }

    public  void dismissDialog(){
        mDialog.dismiss();
    }


    public void setLoadMessage(int resId){
        mDialog.setMessage(mContext.getString(resId));
    }


    @Override
    public void onFailure(Request request, Exception e) {
        dismissDialog();
    }

    @Override
    public void onBeforeRequest(Request request) {

        showDialog();
    }

    @Override
    public void onResponse(Response response) {
        dismissDialog();
    }
}

5.使用

package cniao5.com.cniao5shop.fragment;

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;

import com.daimajia.slider.library.Animations.DescriptionAnimation;
import com.daimajia.slider.library.Indicators.PagerIndicator;
import com.daimajia.slider.library.SliderLayout;
import com.daimajia.slider.library.SliderTypes.BaseSliderView;
import com.daimajia.slider.library.SliderTypes.DefaultSliderView;
import com.daimajia.slider.library.SliderTypes.TextSliderView;
import com.daimajia.slider.library.Tricks.ViewPagerEx;
import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;
import com.squareup.okhttp.Callback;
import com.squareup.okhttp.FormEncodingBuilder;
import com.squareup.okhttp.OkHttpClient;
import com.squareup.okhttp.Request;
import com.squareup.okhttp.RequestBody;
import com.squareup.okhttp.Response;

import java.io.IOException;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.List;

import cniao5.com.cniao5shop.R;
import cniao5.com.cniao5shop.adapter.DividerItemDecortion;
import cniao5.com.cniao5shop.adapter.HomeCatgoryAdapter;
import cniao5.com.cniao5shop.bean.Banner;
import cniao5.com.cniao5shop.bean.HomeCategory;
import cniao5.com.cniao5shop.http.BaseCallback;
import cniao5.com.cniao5shop.http.OkHttpHelper;
import cniao5.com.cniao5shop.http.SpotsCallBack;

/**
 * Created by Ivan on 15/9/25.
 */
public class HomeFragment extends Fragment {


    private SliderLayout mSliderLayout;

//    private PagerIndicator  indicator;


    private RecyclerView mRecyclerView;

    private HomeCatgoryAdapter mAdatper;


    private static  final  String TAG="HomeFragment";


    private Gson mGson = new Gson();

    private List<Banner> mBanner;



    private OkHttpHelper httpHelper = OkHttpHelper.getInstance();

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {


        View view = inflater.inflate(R.layout.fragment_home,container,false);
        mSliderLayout = (SliderLayout) view.findViewById(R.id.slider);

//        indicator= (PagerIndicator) view.findViewById(R.id.custom_indicator);


        requestImages();

        initRecyclerView(view);

        return  view;
    }


    private  void requestImages(){

        String url ="http://112.124.22.238:8081/course_api/banner/query?type=1";
//
//
//        OkHttpClient client = new OkHttpClient();
//
//        RequestBody body = new FormEncodingBuilder()
//                .add("type","1")
//
//                .build();
//
//
//        Request request = new Request.Builder()
//                .url(url)
//                .post(body)
//                .build();
//
//
//
//           client.newCall(request).enqueue(new Callback() {
//                @Override
//                public void onFailure(Request request, IOException e) {
//
//
//                }
//
//                @Override
//                public void onResponse(Response response) throws IOException {
//
//                    if(response.isSuccessful()){
//
//                        String json =  response.body().string();
//
//                        Type type = new TypeToken<List<Banner>>(){}.getType();
//                        mBanner = mGson.fromJson(json,type);
//
//                        initSlider();
//
//
//                    }
//                }
//            });


        httpHelper.get(url, new SpotsCallBack<List<Banner>>(getContext()){


            @Override
            public void onSuccess(Response response, List<Banner> banners) {

                mBanner = banners;
                initSlider();
            }

            @Override
            public void onError(Response response, int code, Exception e) {

            }
        });



    }


    private void initRecyclerView(View view) {

        mRecyclerView = (RecyclerView) view.findViewById(R.id.recyclerview);

        List<HomeCategory> datas = new ArrayList<>(15);

        HomeCategory category = new HomeCategory("热门活动",R.drawable.img_big_1,R.drawable.img_1_small1,R.drawable.img_1_small2);
        datas.add(category);

        category = new HomeCategory("有利可图",R.drawable.img_big_4,R.drawable.img_4_small1,R.drawable.img_4_small2);
        datas.add(category);
        category = new HomeCategory("品牌街",R.drawable.img_big_2,R.drawable.img_2_small1,R.drawable.img_2_small2);
        datas.add(category);

        category = new HomeCategory("金融街 包赚翻",R.drawable.img_big_1,R.drawable.img_3_small1,R.drawable.imag_3_small2);
        datas.add(category);

        category = new HomeCategory("超值购",R.drawable.img_big_0,R.drawable.img_0_small1,R.drawable.img_0_small2);
        datas.add(category);


        mAdatper = new HomeCatgoryAdapter(datas);

        mRecyclerView.setAdapter(mAdatper);

        mRecyclerView.addItemDecoration(new DividerItemDecortion());

        mRecyclerView.setLayoutManager(new LinearLayoutManager(this.getActivity()));

    }


    private void initSlider(){




        if(mBanner !=null){

            for (Banner banner : mBanner){


                TextSliderView textSliderView = new TextSliderView(this.getActivity());
                textSliderView.image(banner.getImgUrl());
                textSliderView.description(banner.getName());
                textSliderView.setScaleType(BaseSliderView.ScaleType.Fit);
                mSliderLayout.addSlider(textSliderView);

            }
        }



        mSliderLayout.setPresetIndicator(SliderLayout.PresetIndicators.Center_Bottom);

        mSliderLayout.setCustomAnimation(new DescriptionAnimation());
        mSliderLayout.setPresetTransformer(SliderLayout.Transformer.RotateUp);
        mSliderLayout.setDuration(3000);

        mSliderLayout.addOnPageChangeListener(new ViewPagerEx.OnPageChangeListener() {
            @Override
            public void onPageScrolled(int i, float v, int i1) {


                Log.d(TAG,"onPageScrolled");

            }

            @Override
            public void onPageSelected(int i) {

                Log.d(TAG,"onPageSelected");
            }

            @Override
            public void onPageScrollStateChanged(int i) {

                Log.d(TAG,"onPageScrollStateChanged");
            }
        });





    }


    @Override
    public void onDestroy() {
        super.onDestroy();

        mSliderLayout.stopAutoCycle();
    }
}

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1.回调方法的使用

(1)A暴露回调接口给B，在接口中实现抽象方法，具体实现由B来做，什么时候调用由A来做