2、RxJava2 & Retrofit2 封装实践 初始化

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RxJava2&Retrofit2的基本实现

RxJava2 & Retrofit2 & Rxlifecycle

依赖

    compile 'com.squareup.okhttp3:okhttp:3.7.0'

    compile 'com.squareup.retrofit2:retrofit:2.2.0'
    compile 'com.squareup.retrofit2:converter-gson:2.2.0'
    compile 'com.squareup.retrofit2:adapter-rxjava2:2.2.0'

    compile 'io.reactivex.rxjava2:rxandroid:2.0.1'
    compile 'io.reactivex.rxjava2:rxjava:2.0.8'

    compile 'com.trello.rxlifecycle2:rxlifecycle:2.0.1'
    // If you want to bind to Android-specific lifecycles
    compile 'com.trello.rxlifecycle2:rxlifecycle-android:2.0.1'
    // If you want pre-written Activities and Fragments you can subclass as providers
    compile 'com.trello.rxlifecycle2:rxlifecycle-components:2.0.1'

HTTPCENTER

public static final String SERVICE = "http://xxxa.com/web/";
    public static final String TOYS_SERVICE = "http://api.xxxb.com/";

    @StringDef({SERVICE, TOYS_SERVICE})
    @Retention(RetentionPolicy.SOURCE)
    public @interface HOST {
    }


    /**
     * 为了拓展性（切换Host），直接传入Retrofit.Builder
     * 要求传入的Retrofit.Builder是单例
     *
     * @param builder
     * @return
     */
    protected static Retrofit getRetrofit(Retrofit.Builder builder) {
        return builder.addConverterFactory(GsonConverterFactory.create(new Gson()))
                .addCallAdapterFactory(RxJava2CallAdapterFactory.create())
                .client(initOkHttpClient())
                .build();
    }

    protected static Retrofit.Builder getBuilder(@HOST String host) {
        do {

            if (TextUtils.equals(host, SERVICE)) {
                return BuilderHolder.builder;
            }
            if (TextUtils.equals(host, TOYS_SERVICE)) {
                return BuilderHolder.toyBuilder;
            }
        } while (false);
        return null;
    }

    private static class BuilderHolder {
        private static Retrofit.Builder builder = new Retrofit.Builder().baseUrl(SERVICE);
        private static Retrofit.Builder toyBuilder = new Retrofit.Builder().baseUrl(TOYS_SERVICE);

    }

    /**
     * 用于请求的Retrofit
     *
     * @return
     */
    protected static Retrofit getRetrofitDm() {
        return getRetrofit(getBuilder(SERVICE));
    }

    protected static Retrofit getRetrofitToys() {
        return getRetrofit(getBuilder(TOYS_SERVICE));
    }

    public static HTTPService getService(@HOST String host) {
        do {

            if (TextUtils.equals(host, SERVICE)) {
                return ServiceHolder.DMSERVICE;
            }
            if (TextUtils.equals(host, TOYS_SERVICE)) {
                return ServiceHolder.TOYSERVICE;
            }
        } while (false);
        return null;
    }

    private static class ServiceHolder {
        static HTTPService DMSERVICE = getRetrofitDm().create(HTTPService.class);
        static HTTPService TOYSERVICE = getRetrofitToys().create(HTTPService.class);
    }


    /**
     * client
     *
     * @return
     */
    private static OkHttpClient initOkHttpClient() {
        OkHttpClient.Builder client = new OkHttpClient().newBuilder();
        client.retryOnConnectionFailure(true);
        client.connectTimeout(1, TimeUnit.MINUTES);
        client.readTimeout(1, TimeUnit.MINUTES);
        client.writeTimeout(1, TimeUnit.MINUTES);
        return client.build();
    }

• 根据HOST初始化HTTPService，都实现了单例
  
  • 构建Retrofit的Builder
  • 根据Builder创建HTTPService
• 创建OkhttpClient

HTTPService

public interface HTTPService {

    /**
     * 发现-推荐-时间轴
     *
     * @param token
     * @param offset
     * @param limit
     * @return
     */
    @GET("v2/index/list")
    Observable<TimeLineModel> requestRecommendTimeLine(@Query("offset") int offset, @Query("limit") int limit);


    @GET("index.php?r=message/heart")
    Observable<Heart> heart();

}

Activity请求

private void dm() {
        HTTPCenter.getService(HTTPCenter.SERVICE).heart()
                .subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread()) //切换线程
                .compose(MainActivity.this.bindToLifecycle()) //绑定生命周期
                .doOnSubscribe(new Consumer<Disposable>() {
                    @Override
                    public void accept(@NonNull Disposable disposable) throws Exception {
                        Toast.makeText(MainActivity.this,"dm start",Toast.LENGTH_SHORT).show();
                    }
                }).doOnTerminate(new Action() {
            @Override
            public void run() throws Exception {
                Toast.makeText(MainActivity.this,"dm end",Toast.LENGTH_SHORT).show();
            }
        }).subscribe(new Consumer<Heart>() {
            @Override
            public void accept(@NonNull Heart heart) throws Exception {
                if(heart != null) {
                    tvDesc.setText(heart.toString());
                }
            }
        });
    }

    private void toys() {
        HTTPCenter.getService(HTTPCenter.TOYS_SERVICE).requestRecommendTimeLine(1,20).map(new Function<TimeLineModel, TimeLineModel>() {
            @Override
            public TimeLineModel apply(@NonNull TimeLineModel timeLineModel) throws Exception {
                return timeLineModel;
            }
        }).subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .compose(MainActivity.this.bindToLifecycle())
                .subscribe(new Observer<TimeLineModel>() {
                    @Override
                    public void onSubscribe(Disposable d) {

                    }

                    @Override
                    public void onNext(TimeLineModel timeLineModel) {
                        tvDesc.setText(timeLineModel.toString());
                    }

                    @Override
                    public void onError(Throwable e) {

                    }

                    @Override
                    public void onComplete() {

                    }
                });
    }

compose(MainActivity.this.bindToLifecycle())是Rxlifecycle，Activity需要继承RxAppCompatActivity
RxLifecycle使用详情

好了，现在基本实现了Rxjava2 & Retrofit2进行网络请求，但是太初级了。下面我们来进行一点点封装～