Android Retrofit Client的实践

Android Retrofit Client的简单封装

前言

Retrofit 是一个 RESTful 的 HTTP 网络请求框架的封装。

使用

添加build.grade依赖

dependencies {

    compile 'io.reactivex.rxjava2:rxjava:2.0.1'
    compile 'io.reactivex.rxjava2:rxandroid:2.0.1'
    compile 'com.squareup.retrofit2:retrofit:2.0.2'
    compile 'com.squareup.retrofit2:converter-gson:2.1.0'
    compile 'com.squareup.retrofit2:adapter-rxjava2:2.3.0'


}

定义接口

public interface NetService {

    @POST("getNewestVersion")
    io.reactivex.Observable<ResponseBody> getAppVersion(
    );
}

OkHttpUtil

public class OkHttpUtil {

    private static final long CACHE_MAX_AGE = 60 * 1;

    private static final long CACHE_STALE_SEC = 60 * 60 * 24;

    private static final String CACHE_CONTROL_CACHE = "only-if-cached, max-stale="   CACHE_STALE_SEC;

    private static final String CACHE_CONTROL_AGE = "max-age=" CACHE_MAX_AGE;

    public static OkHttpUtil getInstance(){
       return new OkHttpUtil();
    }

    public OkHttpClient getOkHttpClient(){
        Cache cache = new Cache(new File(TtPhoneApplication.getInstance().getCacheDir().getAbsolutePath(),"HttpCache"),1024 * 1024 * 10);
        return new OkHttpClient.Builder()
                .cache(cache)
                .connectTimeout(10, TimeUnit.SECONDS)
                .readTimeout(10, TimeUnit.SECONDS)
                .writeTimeout(10, TimeUnit.SECONDS)
                .addInterceptor(mLoginInterceptor)
                .addNetworkInterceptor(mRewriteCacheControlInterceptor)
                .addInterceptor(mRewriteCacheControlInterceptor)
                .build();
    }

    public static boolean isNetWorkAvailable(){
        ConnectivityManager connectivityManager = (ConnectivityManager) TtPhoneApplication.getInstance()
                .getSystemService(Context.CONNECTIVITY_SERVICE);
        if(connectivityManager != null){
            NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
            if(networkInfo != null && networkInfo.isConnected()){
                if(networkInfo.getState() == NetworkInfo.State.CONNECTED){
                    return true;
                }
            }
        }
        return false;
    }

    private final Interceptor mLoginInterceptor = new Interceptor() {
        @Override
        public Response intercept(Chain chain) throws IOException {
            Request request = chain.request();

            long start = System.nanoTime();

            Log.i("AddLogInterceptor:", String.format("Sending request %s on %s%n%s",
                    request.url(), chain.connection(), request.headers()));

            long end = System.nanoTime();

            Response response = chain.proceed(request);

            return response;
        }
    };

    private final Interceptor mRewriteCacheControlInterceptor = new Interceptor() {
        @Override
        public Response intercept(Chain chain) throws IOException {
            Request request = chain.request();
            if (!isNetWorkAvailable()) {
                request = request.newBuilder()
                        .cacheControl(CacheControl.FORCE_CACHE)
                        .build();
            }

            Response originalResponse = chain.proceed(request);

            if (isNetWorkAvailable()) {
                String cacheControl = request.cacheControl().toString();
                return originalResponse.newBuilder()
                        .header("Cache-Control", cacheControl)
                        .removeHeader("Pragma")
                        .build();
            } else {
                return originalResponse.newBuilder()
                        .header("Cache-Control", "public, only-if-cached, max-stale="   CACHE_STALE_SEC)
                        .removeHeader("Pragma")
                        .build();
            }
        }
    };
}

RetrofitUtils

public class NetWorkUtils {

    private static volatile NetWorkUtils sNetWorkUtils;

    private static volatile OkHttpClient sOkHttpClient;

    private Retrofit mRetrofit;

    private NetWorkUtils(){
                 mRetrofit = new Retrofit.Builder()
                .baseUrl(Constans.BASE_URL)
                .client(NetWorkUtils.getOkHttpClient())
                .addConverterFactory(GsonConverterFactory.create())
                .addCallAdapterFactory(RxJava2CallAdapterFactory.create())
                .build();
    }

    public static NetWorkUtils getInstance(){
        if(sNetWorkUtils == null){
            synchronized(NetWorkUtils.class){
                if(sNetWorkUtils == null){
                    sNetWorkUtils = new NetWorkUtils();
                }
            }
        }
        return sNetWorkUtils;
    }

    public static OkHttpClient getOkHttpClient(){
        if(sOkHttpClient == null){
            synchronized (NetWorkUtils.class){
                if(sOkHttpClient == null){
                    sOkHttpClient = OkHttpUtil.getInstance().getOkHttpClient();
                }
            }
        }
        return sOkHttpClient;
    }

    @SuppressWarnings("unchecked") // Single-interface proxy creation guarded by parameter safety.
    public <T> T createService(final Class<T> service){
        return mRetrofit.create(service);
    }
}

参考使用

    public void getAppversionRequest(){
        NetWorkUtils.getInstance()
                .createService(NetService.class)
                .getAppVersion()
                .subscribeOn(Schedulers.io())
                .unsubscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(new Observer<ResponseBody>() {
                    @Override
                    public void onSubscribe(Disposable d) {
                    }
                    @Override
                    public void onNext(ResponseBody value) {
                        LogUtils.i("ok "   value.string());
                    }
                    @Override
                    public void onError(Throwable e) {
                        LogUtils.i("look over cause of error = "   e.getMessage());
                    }
                    @Override
                    public void onComplete() {
                    }
                });

总结

Retrofit 使用的简单流程

这篇好文章是转载于：学新通技术网