implementation 'io.reactivex.rxjava2:rxandroid:2.0.1' implementation 'io.reactivex.rxjava2:rxjava:2.1.3' implementation 'com.squareup.retrofit2:retrofit:2.3.0' implementation 'com.squareup.retrofit2:adapter-rxjava2:2.3.0' implementation 'com.squareup.okhttp3:okhttp:3.9.0' implementation 'com.trello.rxlifecycle2:rxlifecycle-components:2.2.0' implementation 'com.alibaba:fastjson:1.1.59.android'//可選其它框架比如Gson

public class RxHttp { private final String BASE_URL = "https://github.com/"; private Map<String, Retrofit> mRetrofitMap = new HashMap<>(); private RxHttp() { } /**  * 單例模式  * @return  */ public static RxHttp getInstance() {  return RxHttpHolder.sInstance; } private static class RxHttpHolder{  private final static RxHttp sInstance = new RxHttp(); } public Retrofit getRetrofit(String serverUrl) {  Retrofit retrofit;  if (mRetrofitMap.containsKey(serverUrl)) {   retrofit = mRetrofitMap.get(serverUrl);  } else {   retrofit = createRetrofit(serverUrl);   mRetrofitMap.put(serverUrl, retrofit);  }  return retrofit; } public SyncServerService getSyncServer(){  return getRetrofit(BASE_URL).create(SyncServerService.class); } /**  *  * @param baseUrl baseUrl要以/作為結尾 eg：https://github.com/  * @return  */ private Retrofit createRetrofit(String baseUrl) {  OkHttpClient client = new OkHttpClient().newBuilder()    .readTimeout(30, TimeUnit.SECONDS)    .connectTimeout(30, TimeUnit.SECONDS)    .retryOnConnectionFailure(true)    .build();  return new Retrofit.Builder()    .baseUrl(baseUrl)    .addConverterFactory(FastJsonConverterFactory.create())    .addCallAdapterFactory(RxJava2CallAdapterFactory.create())    .client(client)    .build(); }}

public interface SyncServerService { @GET("service/mobile/IsLatestVersion.ashx") Observable<Response<String>> getLatestVersion(@Query("SoftwareID") String SoftwareID,             @Query("ClientVersion") String ClientVersion);}

public class Response<T> { public int ret;//約定 -1為server返回數據異常 200為正常范圍 public String msg; public T data; public int getRet() {  return ret; } public void setRet(int ret) {  this.ret = ret; } public String getMsg() {  return msg; } public void setMsg(String msg) {  this.msg = msg; } public T getData() {  return data; } public void setData(T data) {  this.data = data; }}

public class FastJsonConverterFactory extends Converter.Factory { private final SerializeConfig mSerializeConfig; private FastJsonConverterFactory(SerializeConfig serializeConfig) {  this.mSerializeConfig = serializeConfig; } public static FastJsonConverterFactory create() {  return create(SerializeConfig.getGlobalInstance()); } public static FastJsonConverterFactory create(SerializeConfig serializeConfig) {  return new FastJsonConverterFactory(serializeConfig); } @Override public Converter<?, RequestBody> requestBodyConverter(Type type, Annotation[] parameterAnnotations, Annotation[] methodAnnotations, Retrofit retrofit) {  return new FastJsonRequestBodyConverter<>(mSerializeConfig); } @Override public Converter<ResponseBody, ?> responseBodyConverter(Type type, Annotation[] annotations, Retrofit retrofit) {  return new FastJsonResponseBodyConvert<>(type); }}

final class FastJsonRequestBodyConverter<T> implements Converter<T, RequestBody> { private final MediaType MEDIA_TYPE = MediaType.parse("application/json; charset=UTF-8"); private SerializeConfig mSerializeConfig; public FastJsonRequestBodyConverter(SerializeConfig serializeConfig) {  this.mSerializeConfig = serializeConfig; } @Override public RequestBody convert(T value) throws IOException {  return RequestBody.create(MEDIA_TYPE, JSON.toJSONBytes(value, mSerializeConfig)); }}

final class FastJsonResponseBodyConvert<T> implements Converter<ResponseBody, T> { private Type mType; public FastJsonResponseBodyConvert(Type type) {  this.mType = type; } @Override public T convert(ResponseBody value) throws IOException {  return JSON.parseObject(value.string(), mType); }}

public abstract class BaseObserver<T> implements Observer<Response<T>> { @Override public final void onNext(@NonNull Response<T> result) {  if (result.getRet() == -1) {   onFailure(new Exception(result.getMsg()), result.getMsg());//該異常可以匯報服務端  } else {   onSuccess(result.getData());  } } @Override public void onError(@NonNull Throwable e) {  onFailure(e, RxExceptionUtil.exceptionHandler(e)); } @Override public void onComplete() { } @Override public void onSubscribe(@NonNull Disposable d) { } public abstract void onSuccess(T result); public abstract void onFailure(Throwable e, String errorMsg);}

public class RxExceptionUtil { public static String exceptionHandler(Throwable e){  String errorMsg = "未知錯誤";  if (e instanceof UnknownHostException) {   errorMsg = "網絡不可用";  } else if (e instanceof SocketTimeoutException) {   errorMsg = "請求網絡超時";  } else if (e instanceof HttpException) {   HttpException httpException = (HttpException) e;   errorMsg = convertStatusCode(httpException);  } else if (e instanceof ParseException || e instanceof JSONException    || e instanceof com.alibaba.fastjson.JSONException) {   errorMsg = "數據解析錯誤";  }   return errorMsg; } private static String convertStatusCode(HttpException httpException) {  String msg;  if (httpException.code() >= 500 && httpException.code() < 600) {   msg = "服務器處理請求出錯";  } else if (httpException.code() >= 400 && httpException.code() < 500) {   msg = "服務器無法處理請求";  } else if (httpException.code() >= 300 && httpException.code() < 400) {   msg = "請求被重定向到其他頁面";  } else {   msg = httpException.message();  }  return msg; }}

public abstract class ProgressObserver<T> extends BaseObserver<T>{ private MaterialDialog mMaterialDialog; private Context mContext; private String mLoadingText; public ProgressObserver(Context context){  this(context, null); } public ProgressObserver(Context context, String loadingText){  mContext = context;  mLoadingText = loadingText; } @Override public void onSubscribe(@NonNull Disposable d) {  if (!d.isDisposed()) {   mMaterialDialog = new MaterialDialog.Builder(mContext).content(mLoadingText == null ? "正在加載中..."     : mLoadingText).isProgress(true).build();   mMaterialDialog.show();  } } @Override public void onComplete() {  if (mMaterialDialog != null) {   mMaterialDialog.dismiss();  } } @Override public void onError(@NonNull Throwable e) {  super.onError(e);  if (mMaterialDialog != null) {   mMaterialDialog.dismiss();  } }}

public class RxSchedulers { public static <T> ObservableTransformer<T, T> observableIO2Main(final Context context) {  return upstream -> {   Observable<T> observable = upstream.subscribeOn(Schedulers.io())     .observeOn(AndroidSchedulers.mainThread());   return composeContext(context, observable);  }; } public static <T> ObservableTransformer<T, T> observableIO2Main(final RxFragment fragment) {  return upstream -> upstream.subscribeOn(Schedulers.io())    .observeOn(AndroidSchedulers.mainThread()).compose(fragment.<T>bindToLifecycle()); } private static <T> ObservableSource<T> composeContext(Context context, Observable<T> observable) {  if(context instanceof RxActivity) {   return observable.compose(((RxActivity) context).bindUntilEvent(ActivityEvent.DESTROY));  } else if(context instanceof RxFragmentActivity){   return observable.compose(((RxFragmentActivity) context).bindUntilEvent(ActivityEvent.DESTROY));  }else if(context instanceof RxAppCompatActivity){   return observable.compose(((RxAppCompatActivity) context).bindUntilEvent(ActivityEvent.DESTROY));  }else {   return observable;  } }}

RxHttp.getInstance().getSyncServer().getLatestVersion("1", "1.0.0")    .compose(RxSchedulers.observableIO2Main(this))    .subscribe(new ProgressObserver<String>(this) {     @Override     public void onSuccess(String result) {      Toast.makeText(MainActivity.this, result, Toast.LENGTH_SHORT).show();     }     @Override     public void onFailure(Throwable e, String errorMsg) {     }    });