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Retrofit+RxJava 简单介绍

时间:2017-05-31 13:58:47      阅读:357      评论:0      收藏:0      [点我收藏+]

标签:else   gradle   str   active   ica   htm   tac   文件   square   

Retrofit 是一个当前很流行的网络请求库

  想使用它首先在gradle文件中引用

   compile ‘com.squareup.retrofit2:retrofit:2.1.0‘
    compile ‘com.squareup.retrofit2:adapter-rxjava:2.1.0‘
    compile ‘com.squareup.retrofit2:converter-gson:2.0.2’

RxJava 是针对于Java语音的一个异步响应式编程库

  compile ‘io.reactivex.rxjava2:rxjava:2.0.1‘
  compile ‘io.reactivex.rxjava2:rxandroid:2.0.1’

Retrofit的使用

  创建一个Retrofit对象

private static void initRetrofit() {
        sRetrofit = new Retrofit.Builder()
                .baseUrl("http://www.weather.com.cn/")
                .client(sOkHttpClient)
                .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
                .addConverterFactory(GsonConverterFactory.create())
                .build();
    }

  client 设置OkHttp用于拦截器设置

  addCallAdapterFactory()设置支持RxJava返回值为Oservable<M>

  addConverterFactory() 设置支持Gson 直接返回实体类

接下来在创建一个OKHttpClient.Buildr对象

  

OkHttpClient.Builder builder = new OkHttpClient.Builder();

  1设置结果拦截器

Interceptor cacheInterceptor = new Interceptor() {
            @Override
            public Response intercept(Chain chain) throws IOException {
                Request request = chain.request();
                if (!CommonUtil.isNetworkConnected(MyApplication.getInstance())) {
                    request = request.newBuilder()
                            .cacheControl(CacheControl.FORCE_CACHE)
                            .build();
                }
                Response response = chain.proceed(request);
                Response.Builder newBuilder = response.newBuilder();
                if (CommonUtil.isNetworkConnected(MyApplication.getInstance())) {
                    int maxAge = 0;
                    // 有网络时 设置缓存超时时间0个小时
                    newBuilder.header("Cache-Control", "public, max-age=" + maxAge);
                } else {
                    // 无网络时,设置超时为4周
                    int maxStale = 60 * 60 * 24 * 28;
                    newBuilder.header("Cache-Control", "public, only-if-cached, max-stale=" + maxStale);
                }
                return newBuilder.build();
            }
        };

  在这里有网络取最新,没网取缓存

builder.cache(cache).addInterceptor(cacheInterceptor); 

  添加到builder;

  2.设置请求拦截器

Interceptor requestInterceptor = new Interceptor() {
            @Override
            public Response intercept(Chain chain) throws IOException {
                Request request = chain.request()
                        .newBuilder()
                        .addHeader("Accept", "application/vnd.yu.v4+json")
                        .addHeader("Content-Type", "application/json")
                        .addHeader("Range", "page:1,max:10")
                    .addHeader("Authorization", "")
                        .build();request.headers().toString());
                return chain.proceed(request);
            }
        };

  一般设置统一header 时使用

builder.addNetworkInterceptor(requestInterceptor);

  设置超时重连

builder.connectTimeout(15, TimeUnit.SECONDS);
builder.readTimeout(20, TimeUnit.SECONDS);
builder.writeTimeout(20, TimeUnit.SECONDS);
builder.retryOnConnectionFailure(true);
return builder.build();

  OkHttp设置完成。

接下来去设置ApiCallBack

  使用RxJava订阅

  ApiCallBack<M>是abstract要继承Subscriber<M>

public abstract class ApiCallback<M> extends Subscriber<M> {

    public abstract void onSuccess(M model);

    public abstract void onFailure(String msg);

    public abstract void onFinish();

    @Override
    public void onError(Throwable e) {
        e.printStackTrace();
        if (e instanceof HttpException) {
            HttpException httpException = (HttpException) e;
            int code = httpException.code();
            String msg = httpException.getMessage();
            if (code == 504) {
                msg = "网络不给力";
            }
            if (code == 502 || code == 404) {
                msg = "服务器异常,请稍后再试";
            }
            onFailure(msg);
        } else {
            onFailure(e.getMessage());
        }
        onFinish();
    }

    @Override
    public void onNext(M model) {
        onSuccess(model);
    }

    @Override
    public void onCompleted() {
        onFinish();
    }

}

 

接下来去写ApiService

  ApiService 是个接口

  Retrofit提供的请求方式用注解修改变量生成URL等

  RxJava方式

@GET("adat/sk/{cityId}.html")
Observable<MainModel> getMainBanner(@Path("cityId") String cityId);

//请求方式@GET,@POST ,@PUT @DELETE 等。
(@Path(“cityId") String cityId)    //修改路径中对应的变量{cityId}
@POST
Observable<MainModel> getTaskToken(@Url String url, @Body String body);

@Headers({"Accept: application/json","Content-Type: application/json"})
@GET
Observable<RecordsTask> getMainTask(@Url String url, @Header("Authorization") String token);

  以上简单写了几种大多数都包括了

需要的已经配置好了 下面去使用它

  

 //RXjava注册
    public void addSubscription(Observable observable, Subscriber subscriber) {
        if (mCompositeSubscription == null) {
            mCompositeSubscription = new CompositeSubscription();
        }
        mCompositeSubscription.add(observable
                .subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(subscriber));
    }

  把上面内容写在Base中

  subscribeOn() : 指定

subscribe()所发生的线程,即Observable.OnSubscribe被激活时所处的线程。或者叫做事件产生的线程。

observeOn():指定用户所运行的线程。或者叫做事件消费的线程。

使用 subscribeOn() observeOn() 两个方法来对线程进行控制了。

Activity中调用 

public void loadWeather(String city) {
        addSubscription(mApiService.getMainBanner(city), new ApiCallback<MainModel>() {
            @Override
            public void onSuccess(MainModel response) {
                mMvpView.onSuccess(response);
            }

            @Override
            public void onFailure(String msg) {
                mMvpView.onFail(msg, 1);
            }

            @Override
            public void onFinish() {

            }
        });
    }

在结束时还需要取消RxJava的注册以免内存泄漏

public void onUnsubscribe() {
        if (mCompositeSubscription != null && mCompositeSubscription.hasSubscriptions()) {
            mCompositeSubscription.unsubscribe();
        }
    }

结束。

 

Retrofit+RxJava 简单介绍

标签:else   gradle   str   active   ica   htm   tac   文件   square   

原文地址:http://www.cnblogs.com/teddy-yan/p/6923203.html

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