{"id":20031148,"url":"https://github.com/qyxxjd/rxjava2demo","last_synced_at":"2025-10-07T16:13:49.056Z","repository":{"id":88999657,"uuid":"77379726","full_name":"qyxxjd/RxJava2Demo","owner":"qyxxjd","description":"RxJava 2.X Retrofit OkHttp 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`RxJava 1.X`升级`RxJava 2.X`部分变更\n\n| 描述 | RxJava 1.X | RxJava 2.X |\n| ----- | ----- | ----- |\n|`package`包名| `rx.xxx` | `io.reactivex.xxx` |\n| [Reactive Streams规范](http://www.reactive-streams.org/) | `1.X`早于`Reactive Streams`规范出现，仅部分支持规范 | 完全支持 |\n|[Backpressure 背压](https://github.com/ReactiveX/RxJava/wiki/Backpressure)|对背压的支持不完善|`Observable`设计为不支持背压\u003cbr\u003e新增`Flowable`支持背压|\n|`null`空值| 支持 | 不再支持`null`值，传入`null`值会抛出 `NullPointerException` |\n|`Schedulers`线程调度器| `Schedulers.immediate()`\u003cbr\u003e`Schedulers.trampoline()`\u003cbr\u003e`Schedulers.computation()`\u003cbr\u003e`Schedulers.newThread()`\u003cbr\u003e`Schedulers.io()`\u003cbr\u003e`Schedulers.from(executor)`\u003cbr\u003e`AndroidSchedulers.mainThread()` | 移除`Schedulers.immediate()`\u003cbr\u003e新增`Schedulers.single()`\u003cbr\u003e其它未变 |\n|`Single`| 行为类似`Observable`，但只会发射一个`onSuccess`或`onError` | 按照`Reactive Streams`规范重新设计，遵循协议`onSubscribe(onSuccess/onError)` |\n|`Completable`| 行为类似`Observable`，要么全部成功，要么就失败 | 按照`Reactive Streams`规范重新设计，遵循协议`onSubscribe (onComplete/onError)` |\n|`Maybe`| 无 | `2.X`新增，行为类似`Observable`，可能会有一个数据或一个错误，也可能什么都没有。可以将其视为一种返回可空值的方法。这种方法如果不抛出异常的话，将总是会返回一些东西，但是返回值可能为空，也可能不为空。按照`Reactive Streams`规范设计，遵循协议`onSubscribe (onSuccess/onError/onComplete)` |\n|`Flowable`| 无 | `2.X`新增，行为类似`Observable`，按照`Reactive Streams`规范设计，支持背压`Backpressure` |\n|`Subject`| `AsyncSubject`\u003cbr\u003e`BehaviorSubject`\u003cbr\u003e`PublishSubject`\u003cbr\u003e`ReplaySubject`\u003cbr\u003e`UnicastSubject` | `2.X`依然维护这些`Subject`现有的功能，并新增：\u003cbr\u003e`AsyncProcessor`\u003cbr\u003e`BehaviorProcessor`\u003cbr\u003e`PublishProcessor`\u003cbr\u003e`ReplayProcessor`\u003cbr\u003e`UnicastProcessor`\u003cbr\u003e支持背压`Backpressure` |\n|`Subscriber`| `Subscriber` | 由于与`Reactive Streams`的命名冲突，`Subscriber`已重命名为`Disposable` |\n\n\n\n#### `RxJava 2.X` + `Retrofit` + `OkHttp` 简单示例：\n\n1.声明接口\n```java\n    public interface FaceApi {\n\n        @Multipart\n        @POST(\"facepp/v3/compare\")\n        Observable\u003cString\u003e compare(@Part(\"api_key\") RequestBody apiKey,\n                                   @Part(\"api_secret\") RequestBody apiSecret,\n                                   @Part MultipartBody.Part... files);\n    }\n```\n\n2.初始化Api\n```java\n    private void initApi() {\n        OkHttpClient okHttpClient = new OkHttpClient.Builder()\n                .addNetworkInterceptor(new HttpLoggingInterceptor().setLevel(HttpLoggingInterceptor.Level.BODY))\n                .retryOnConnectionFailure(true)\n                .connectTimeout(CONNECT_TIMEOUT_TIME, TimeUnit.SECONDS)\n                .writeTimeout(CONNECT_TIMEOUT_TIME, TimeUnit.SECONDS)\n                .readTimeout(CONNECT_TIMEOUT_TIME, TimeUnit.SECONDS)\n                .build();\n        Gson gson = new GsonBuilder()\n                .setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES)\n                .create();\n        mFaceApi = new Retrofit.Builder().baseUrl(PrivateConstant.FACE_URL_PREFIX)\n                                         .client(okHttpClient)\n                                         .addConverterFactory(GsonConverterFactory.create(gson))\n                                         .addCallAdapterFactory(RxJava2CallAdapterFactory.create())\n                                         .build()\n                                         .create(FaceApi.class);\n    }\n```\n\n3.开始网络请求\n```java\n    /**\n     * 测试人脸识别API\n     *\n     * 实际项目中：步骤1和3会在合适的地方进行统一处理，不需要每个接口都进行设置\n     *\n     * @param imagePath1 需要比对的照片1\n     * @param imagePath2 需要比对的照片2\n     * @return\n     */\n    private void testFaceApi(@NonNull String imagePath1, @NonNull String imagePath2) {\n        //PrivateConstant里面声明的私有api_id,需要自己到官网申请\n        mFaceApi.compare(convert(PrivateConstant.FACE_API_ID),\n                         convert(PrivateConstant.FACE_API_SECRET),\n                         convert(\"image_file1\", new File(imagePath1)),\n                         convert(\"image_file2\", new File(imagePath2)))\n                //1.线程切换的封装\n                .compose(RxTransformer.\u003cString\u003eapplySchedulers(RxTransformer.Observable.IO_ON_UI))\n                //2.当前Activity onStop时自动取消请求\n                .compose(this.\u003cString\u003ebindEvent(ActivityEvent.STOP))\n                //3.原始数据转换为对象\n                .map(DATA_PARSE_FUNCTION)\n                .subscribeWith(new DisposableObserver\u003cIdentifyResult\u003e() {\n                    @Override\n                    public void onNext(IdentifyResult identifyResult) {\n                        XLog.d(\"FaceApi --\u003e \" + identifyResult.toString());\n                    }\n\n                    @Override\n                    public void onError(Throwable e) {\n                        XLog.e(\"FaceApi --\u003e \" + e.getMessage());\n                    }\n\n                    @Override\n                    public void onComplete() {\n                        XLog.d(\"FaceApi --\u003e onComplete\");\n                    }\n                });\n    }\n```\n\n\n#### `RxJava 2.X` 简单示例： [查看代码](https://github.com/qyxxjd/RxJava2Demo/blob/master/app/src/main/java/com/classic/demo/OperatorDemo.java)\n\n`create`操作符\n```java\n    Observable.create(new ObservableOnSubscribe\u003cInteger\u003e() {\n                  @Override public void subscribe(ObservableEmitter\u003cInteger\u003e emitter)\n                          throws Exception {\n                      if (!emitter.isDisposed()) {\n                          for (int i = 0; i \u003c 10; i++) {\n                              emitter.onNext(i);\n                          }\n                          emitter.onComplete();\n                      }\n                  }\n              })\n              .subscribeOn(Schedulers.io())\n              .unsubscribeOn(Schedulers.io())\n              .observeOn(AndroidSchedulers.mainThread())\n              //这里只列举三种常见的使用方式\n              .subscribe(OBSERVER); //方式1\n              //.subscribeWith(DISPOSABLE_OBSERVER); //方式2\n              //.subscribe(NEXT_CONSUMER, ERROR_CONSUMER, COMPLETE); //方式3\n```\n\n`fromArray`操作符\n```java\n    Observable.fromArray(1, 2, 3, 4, 5)\n              //使用变换将线程控制的代码封装起来，使代码更简洁，也便于管理\n              .compose(RxTransformer.\u003cInteger\u003eapplySchedulers(RxTransformer.Observable.IO))\n              .subscribeWith(DISPOSABLE_OBSERVER);\n```\n\n`fromCallable`操作符\n```java\n    Observable.fromCallable(new Callable\u003cInteger\u003e() {\n                  @Override public Integer call() throws Exception {\n                      return 123;\n                  }\n              })\n              .compose(RxTransformer.\u003cInteger\u003eapplySchedulers(RxTransformer.Observable.IO))\n              .subscribeWith(DISPOSABLE_OBSERVER);\n```\n\n`fromIterable`操作符\n```java\n    ArrayList\u003cInteger\u003e list = new ArrayList\u003c\u003e();\n    list.add(123);\n    list.add(456);\n    list.add(789);\n    Observable.fromIterable(list)\n              .compose(RxTransformer.\u003cInteger\u003eapplySchedulers(RxTransformer.Observable.IO))\n              .subscribeWith(DISPOSABLE_OBSERVER);\n```\n\n`fromPublisher`操作符\n```java\n    Observable.fromPublisher(new Publisher\u003cInteger\u003e() {\n                  @Override public void subscribe(Subscriber\u003c? super Integer\u003e s) {\n                      s.onNext(6);\n                      s.onNext(7);\n                      s.onNext(8);\n                      s.onNext(9);\n                      s.onComplete();\n                  }\n              })\n              .compose(RxTransformer.\u003cInteger\u003eapplySchedulers(RxTransformer.Observable.IO))\n              .subscribeWith(DISPOSABLE_OBSERVER);\n```\n\n`just`操作符\n```java\n    Observable.just(1, 2, 3, 4, 5, 6)\n              .compose(RxTransformer.\u003cInteger\u003eapplySchedulers(RxTransformer.Observable.IO))\n              .subscribeWith(DISPOSABLE_OBSERVER);\n```\n\n`range`操作符\n```java\n    Observable.range(100, 60)\n              .compose(RxTransformer.\u003cInteger\u003eapplySchedulers(RxTransformer.Observable.IO))\n              .subscribeWith(DISPOSABLE_OBSERVER);\n```\n\n`timer`操作符\n```java\n    Observable.timer(10, TimeUnit.MILLISECONDS)\n              .compose(RxTransformer.\u003cLong\u003eapplySchedulers(RxTransformer.Observable.COMPUTATION))\n              .subscribe(new Consumer\u003cLong\u003e() {\n                  @Override\n                  public void accept(Long aLong) throws Exception {\n                      XLog.d(\"延迟10毫秒的任务启动\");\n                  }\n              });\n```\n\n`interval`操作符\n```java\n    Observable.interval(1, TimeUnit.SECONDS)\n              .compose(RxTransformer.\u003cLong\u003eapplySchedulers(RxTransformer.Observable.COMPUTATION))\n              .subscribe(new Consumer\u003cLong\u003e() {\n                  @Override\n                  public void accept(Long aLong) throws Exception {\n                      XLog.d(\"每隔1秒的定时任务启动\");\n                  }\n              });\n```\n\n上面示例代码用到的变量\n```java\n    private static final Observer\u003cInteger\u003e OBSERVER = new Observer\u003cInteger\u003e() {\n        @Override public void onSubscribe(Disposable d) {\n            XLog.d(\"onSubscribe\");\n        }\n\n        @Override public void onNext(Integer value) {\n            XLog.d(\"onNext:\" + value);\n        }\n\n        @Override public void onError(Throwable e) {\n            XLog.e(\"onError:\" + e.getMessage());\n        }\n\n        @Override public void onComplete() {\n            XLog.d(\"onComplete\");\n        }\n    };\n\n    private static final DisposableObserver\u003cInteger\u003e DISPOSABLE_OBSERVER\n            = new DisposableObserver\u003cInteger\u003e() {\n        @Override public void onNext(Integer value) {\n            XLog.d(\"onNext:\" + value);\n        }\n\n        @Override public void onError(Throwable e) {\n            XLog.e(\"onError:\" + e.getMessage());\n        }\n\n        @Override public void onComplete() {\n            XLog.d(\"onComplete\");\n        }\n    };\n\n    private static final Consumer\u003cInteger\u003e NEXT_CONSUMER = new Consumer\u003cInteger\u003e() {\n        @Override public void accept(Integer integer) throws Exception {\n            XLog.d(\"onNext:\" + integer);\n        }\n    };\n\n    private static final Consumer\u003cThrowable\u003e ERROR_CONSUMER = new Consumer\u003cThrowable\u003e() {\n        @Override public void accept(Throwable throwable) throws Exception {\n            XLog.e(\"onError:\" + throwable.getMessage());\n        }\n    };\n\n    private static final Action COMPLETE = new Action() {\n        @Override public void run() throws Exception {\n            XLog.d(\"onComplete\");\n        }\n    };\n```\n","funding_links":[],"categories":[],"sub_categories":[],"project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fqyxxjd%2Frxjava2demo","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fqyxxjd%2Frxjava2demo","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fqyxxjd%2Frxjava2demo/lists"}