前言
RxJava和Retrofit2用了一段時間了，寫個小例子，分享出來，有什么不對的地方還請大神在評論區(qū)指正。
什么是Retrofit2
官網(wǎng)是這么介紹的：
Retrofit adapts a Java interface to HTTP calls by using annotations on the declared methods to
define how requests are made。
我翻譯的可能不準(zhǔn)確，他的大概意思是說：Retrofit 是一個 java 接口類，以注解的方式用于 HTTP 網(wǎng)絡(luò)請求。那下面我們一起來看看是怎么使用的？
發(fā)現(xiàn)問題
最近在幫兄弟公司做一個資訊類的項(xiàng)目，使用了RxJava和Retrofit2這對黃金組合，在編寫代碼的過程中發(fā)現(xiàn)有很多很多的網(wǎng)絡(luò)請求都需要做.subscribeOn(Schedulers.io()).observeOn(AndroidSchedulers.mainThread()).onErrorReturn()的處理，為避免這樣,需要沉思。
解決問題
import android.util.Log;import com.wei.caiqiwang.data.entity.BaseResponse;import rx.Observable;import rx.Subscriber;import rx.Subscription;import rx.android.schedulers.AndroidSchedulers;import rx.functions.Func1;import rx.schedulers.Schedulers;public class RxNet { /** * 統(tǒng)一處理單個請求 */ public static <T> Subscription request(Observable<BaseResponse<T>> observable, final RxNetCallBack<T> callBack) { return observable .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .onErrorReturn(new Func1<Throwable, BaseResponse<T>>() { @Override public BaseResponse<T> call(Throwable throwable) { Log.v("LinNetError",throwable.getMessage()); callBack.onFailure(ExceptionHandle.handleException(throwable)); return null; } }) .subscribe(new Subscriber<BaseResponse<T>>() { @Override public void onCompleted() { } @Override public void onError(Throwable e) { } @Override public void onNext(BaseResponse<T> baseResponse) { if (baseResponse.getCode().equals("200")) { callBack.onSuccess(baseResponse.getData()); } else { callBack.onFailure(baseResponse.getMsg()); } } }); } /** * 統(tǒng)一處理單個請求沒有 msg body */ public static Subscription requestWithoutBody(Observable<BaseResponse> observable, final RxNetCallBack<String> callBack) { return observable .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .onErrorReturn(new Func1<Throwable, BaseResponse>() { @Override public BaseResponse call(Throwable throwable) { callBack.onFailure(ExceptionHandle.handleException(throwable)); return null; } }) .subscribe(new Subscriber<BaseResponse>() { @Override public void onCompleted() { } @Override public void onError(Throwable e) { } @Override public void onNext(BaseResponse baseResponse) { if (baseResponse.getCode().equals("200")) { callBack.onSuccess(baseResponse.getMsg()); } else { callBack.onFailure(baseResponse.getMsg()); } } }); }}回調(diào)就是普通的回調(diào)
public interface RxNetCallBack<T> { /** * 數(shù)據(jù)請求成功 * * @param data 請求到的數(shù)據(jù) */ void onSuccess(T data); /** * 數(shù)據(jù)請求失敗 */ void onFailure(String msg);}錯誤異常處理（可能不全）：
import android.net.ParseException;import com.google.gson.JsonParseException;import org.apache.http.conn.ConnectTimeoutException;import org.json.JSONException;import java.net.ConnectException;import retrofit2.HttpException;public class ExceptionHandle { private static final int UNAUTHORIZED = 401; private static final int FORBIDDEN = 403; private static final int NOT_FOUND = 404; private static final int REQUEST_TIMEOUT = 408; private static final int INTERNAL_SERVER_ERROR = 500; private static final int BAD_GATEWAY = 502; private static final int SERVICE_UNAVAILABLE = 503; private static final int GATEWAY_TIMEOUT = 504; public static String handleException(Throwable e) { String errorMsg; if (e instanceof HttpException) { HttpException httpException = (HttpException) e; switch (httpException.code()) { case UNAUTHORIZED: case FORBIDDEN: case NOT_FOUND: case REQUEST_TIMEOUT: case GATEWAY_TIMEOUT: case INTERNAL_SERVER_ERROR: case BAD_GATEWAY: case SERVICE_UNAVAILABLE: default: errorMsg = "網(wǎng)絡(luò)錯誤"; break; } return errorMsg + ":" + httpException.code(); } else if (e instanceof JsonParseException || e instanceof JSONException || e instanceof ParseException) { return "解析錯誤"; } else if (e instanceof ConnectException) { return "連接失敗"; } else if (e instanceof javax.net.ssl.SSLHandshakeException) { return "證書驗(yàn)證失敗"; } else if (e instanceof ConnectTimeoutException) { return "連接超時"; } else if (e instanceof java.net.SocketTimeoutException) { return "連接超時"; } else { return "未知錯誤"; } }}然后就是ApiManager：
import android.util.Log;import com.wei.demo.data.AppConstants;import java.util.concurrent.TimeUnit;import okhttp3.OkHttpClient;import okhttp3.logging.HttpLoggingInterceptor;import retrofit2.Retrofit;import retrofit2.adapter.rxjava.RxJavaCallAdapterFactory;import retrofit2.converter.gson.GsonConverterFactory;public class ApiManager { private Retrofit client; private ApiManager() { client = new Retrofit.Builder() .baseUrl(AppConstants.Base_Url_Api_Test) .client(initClient()) .addCallAdapterFactory(RxJavaCallAdapterFactory.create()) .addConverterFactory(GsonConverterFactory.create()) .build(); } private static volatile DemoApi INSTANCE; public static DemoApi getInstance() { if (INSTANCE == null) { synchronized (ApiManager.class) { if (INSTANCE == null) { INSTANCE = new ApiManager().getApi(); } } } return INSTANCE; } private DemoApi getApi() { return client.create(DemoApi.class); } private static OkHttpClient initClient() { OkHttpClient.Builder builder = new OkHttpClient.Builder(); //聲明日志類 HttpLoggingInterceptor httpLoggingInterceptor = new HttpLoggingInterceptor(new HttpLoggingInterceptor.Logger() { @Override public void log(String message) { Log.v("NetLog", message); } }); //設(shè)定日志級別 httpLoggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BODY); //延時 builder.addInterceptor(httpLoggingInterceptor) .connectTimeout(10, TimeUnit.SECONDS) .readTimeout(10, TimeUnit.SECONDS) .writeTimeout(10, TimeUnit.SECONDS); return builder.build(); }}怎么用？
RxNet.request(ApiManager.getInstance().getUserMsg(map), new RxNetCallBack<List<MsgBean>>() { @Override public void onSuccess(List<MsgBean> data) { // 處理數(shù)據(jù) } @Override public void onFailure(String msg) { //出現(xiàn)了錯誤 showToast(msg); } });Demo https://github.com/FriendLin/NetRequestDemo
總結(jié)
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