Retrofit 探索二：RxJava+Retrofit实现网络请求

一、环境配置

1.1 添加网络权限

 <uses-permission android:name="android.permission.INTERNET"/>    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>

1.2 Retrofit、RxJava工具包加入

 //Rxjava    compile 'io.reactivex.rxjava2:rxjava:2.1.6'    compile 'io.reactivex.rxjava2:rxandroid:2.0.1'    //Retrofit    compile 'com.squareup.retrofit2:retrofit:2.3.0'    compile 'com.squareup.retrofit2:converter-gson:2.3.0'    compile 'com.squareup.retrofit2:adapter-rxjava2:2.3.0'    compile 'com.squareup.okhttp3:logging-interceptor:3.8.0'

1.3 配置Retrofit支持Gson和RxJava

 mRetrofit = new Retrofit.Builder()                .addConverterFactory(GsonConverterFactory.create(new GsonBuilder().create()))//支持Gson转换                .addCallAdapterFactory(RxJava2CallAdapterFactory.create())//支持RxJava                .baseUrl(ApiConstants.API_SERVER)                .client(mClient)                .build();

1.4 配置Header

Interceptor mHeaderInterceptor = new Interceptor() {        @Override        public Response intercept(Chain chain) throws IOException {            Request originalRequest = chain.request();            Request.Builder builder = originalRequest.newBuilder();            //设置具体的Head内容            builder.header("timestamp", System.currentTimeMillis() + "");            Request.Builder requestBuilder =                    builder.method(originalRequest.method(), originalRequest.body());            Request request = requestBuilder.build();            return chain.proceed(request);        }    };

1.5 缓存配置

  private Interceptor mCacheInterceptor = new Interceptor() {        @Override        public Response intercept(Chain chain) throws IOException {            Request request = chain.request();            if (!NetworkUtils.isNetworkAvailable(MyApplication.getContext())) {                request = request.newBuilder()                        .cacheControl(CacheControl.FORCE_CACHE).build();            }            Response response = chain.proceed(request);            if (NetworkUtils.isNetworkAvailable(MyApplication.getContext())) {                int maxAge = 60; //缓存一分钟                String cacheControl = "public,max-age=" + maxAge;                return response.newBuilder()                        .header("Cache-Control",cacheControl)                        .removeHeader("Pragma").build();            } else {                int maxStale = 60 * 60 * 24 * 7 * 4;  //4周                return response.newBuilder()                        .header("Cache-Control", "public,only-if-cached,max-stale=" + maxStale)                        .removeHeader("Pragma").build();            }        }    };

1.6 配置OkHttpClient

 //设置缓存路径        File httpCacheDirectory = new File(MyApplication.getContext().getCacheDir(), "RetrofitCache");        int cacheSize = 1024 * 1024 * 50; // 50 MiB        Cache cache = new Cache(httpCacheDirectory, cacheSize);        HttpLoggingInterceptor loggingInterceptor = new HttpLoggingInterceptor();        loggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BODY);        mClient = new OkHttpClient.Builder()                .addInterceptor(loggingInterceptor)//添加日志                .addInterceptor(mHeaderInterceptor)//添加Header                .addInterceptor(mCacheInterceptor)//添加缓存                .addNetworkInterceptor(mCacheInterceptor)                .cache(cache)                .connectTimeout(20, TimeUnit.SECONDS)//设置连接超时20秒                .build();

ApiRetrofit完整代码

package com.wj.rxcode.api;import com.google.gson.GsonBuilder;import com.wj.rxcode.MyApplication;import com.wj.rxcode.utils.NetworkUtils;import java.io.File;import java.io.IOException;import java.util.concurrent.TimeUnit;import okhttp3.Cache;import okhttp3.CacheControl;import okhttp3.Interceptor;import okhttp3.OkHttpClient;import okhttp3.Request;import okhttp3.Response;import okhttp3.logging.HttpLoggingInterceptor;import retrofit2.Retrofit;import retrofit2.adapter.rxjava2.RxJava2CallAdapterFactory;import retrofit2.converter.gson.GsonConverterFactory;public class ApiRetrofit {    private static ApiRetrofit mApiRetrofit;    private final Retrofit mRetrofit;    private OkHttpClient mClient;    private ApiService mApiService;    public static ApiRetrofit getInstance() {        if (mApiRetrofit == null) {            synchronized (Object.class) {                if (mApiRetrofit == null) {                    mApiRetrofit = new ApiRetrofit();                }            }        }        return mApiRetrofit;    }    public ApiService getApiService() {        return mApiService;    }    public ApiRetrofit() {        //设置缓存路径        File httpCacheDirectory = new File(MyApplication.getContext().getCacheDir(), "RetrofitCache");        int cacheSize = 1024 * 1024 * 50; // 50 MiB        Cache cache = new Cache(httpCacheDirectory, cacheSize);        HttpLoggingInterceptor loggingInterceptor = new HttpLoggingInterceptor();        loggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BODY);        mClient = new OkHttpClient.Builder()                .addInterceptor(loggingInterceptor)//添加日志                .addInterceptor(mHeaderInterceptor)//添加Header                .addInterceptor(mCacheInterceptor)//添加缓存                .addNetworkInterceptor(mCacheInterceptor)                .cache(cache)                .connectTimeout(20, TimeUnit.SECONDS)//设置连接超时20秒                .build();        mRetrofit = new Retrofit.Builder()                .addConverterFactory(GsonConverterFactory.create(new GsonBuilder().create()))//支持Gson转换                .addCallAdapterFactory(RxJava2CallAdapterFactory.create())//支持RxJava                .baseUrl(ApiConstants.API_SERVER)                .client(mClient)                .build();        mApiService = mRetrofit.create(ApiService.class);    }    //缓存配置    private Interceptor mCacheInterceptor = new Interceptor() {        @Override        public Response intercept(Chain chain) throws IOException {            Request request = chain.request();            if (!NetworkUtils.isNetworkAvailable(MyApplication.getContext())) {                request = request.newBuilder()                        .cacheControl(CacheControl.FORCE_CACHE).build();            }            Response response = chain.proceed(request);            if (NetworkUtils.isNetworkAvailable(MyApplication.getContext())) {                int maxAge = 60; //缓存一分钟                String cacheControl = "public,max-age=" + maxAge;                return response.newBuilder()                        .header("Cache-Control",cacheControl)                        .removeHeader("Pragma").build();            } else {                int maxStale = 60 * 60 * 24 * 7 * 4;  //4周                return response.newBuilder()                        .header("Cache-Control", "public,only-if-cached,max-stale=" + maxStale)                        .removeHeader("Pragma").build();            }        }    };    Interceptor mHeaderInterceptor = new Interceptor() {        @Override        public Response intercept(Chain chain) throws IOException {            Request originalRequest = chain.request();            Request.Builder builder = originalRequest.newBuilder();            //设置具体的Head内容            builder.header("timestamp", System.currentTimeMillis() + "");            Request.Builder requestBuilder =                    builder.method(originalRequest.method(), originalRequest.body());            Request request = requestBuilder.build();            return chain.proceed(request);        }    };}

ApiConstants网络接口常量

package com.wj.rxcode.api;/** * Created by wj on 2017/11/17 13:23. */public class ApiConstants {    //好奇心日报    public static final String API_SERVER = "http://app3.qdaily.com/";    //http://app3.qdaily.com/app3/papers/detail/2014.json    public static final String API_PAPERS_DETAIL="app3/papers/detail/2014.json";}

ApiService接口

package com.wj.rxcode.api;import com.wj.rxcode.bean.PapersDetailBean;import io.reactivex.Observable;import retrofit2.http.GET;public interface ApiService {    @GET(ApiConstants.API_PAPERS_DETAIL)    Observable<PapersDetailBean> getPaperDetail();}

二、使用

package com.wj.rxcode;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.util.Log;import com.wj.rxcode.api.ApiRetrofit;import com.wj.rxcode.api.ApiService;import com.wj.rxcode.bean.PapersDetailBean;import io.reactivex.Observable;import io.reactivex.Observer;import io.reactivex.android.schedulers.AndroidSchedulers;import io.reactivex.disposables.Disposable;import io.reactivex.schedulers.Schedulers;public class MainActivity extends AppCompatActivity {    private ApiService apiService;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        apiService = ApiRetrofit.getInstance().getApiService();        getPaperDetail();    }    private void getPaperDetail(){        Observer<PapersDetailBean> observer= new Observer<PapersDetailBean>() {            //开始请求            @Override            public void onSubscribe(Disposable d) {                Log.i("RxJava","开始请求");            }            //请求完成            @Override            public void onComplete() {                Log.i("RxJava","请求完成");            }            //请求失败            @Override            public void onError(Throwable e) {                Log.i("RxJava","请求失败");            }            //请求成功            @Override            public void onNext(PapersDetailBean bean) {                Log.i("RxJava","请求成功");            }        };        Observable<PapersDetailBean> paperDetail = apiService.getPaperDetail();        paperDetail.subscribeOn(Schedulers.newThread())                .observeOn(AndroidSchedulers.mainThread())                .subscribe(observer);    }}