[移动开发]RxJava 实例（java语言）

 Observable.create(new ObservableOnSubscribe<String>() {
                @Override
                public void subscribe(@io.reactivex.annotations.NonNull ObservableEmitter<String> emitter) throws Exception {

                    String videoBase64 = Tools.fileBase64String(mediaPath, "data:video/mp4;base64,");
                    LogUtils.Companion.err(">>>>>完成");
                    emitter.onNext(videoBase64 != null ? videoBase64 : "");
                }
            }).observeOn(AndroidSchedulers.mainThread())
                    .subscribeOn(Schedulers.io())
                    .subscribe(new Observer<String>() {
                        @Override
                        public void onSubscribe(@io.reactivex.annotations.NonNull Disposable d) {

                        }

                        @Override
                        public void onNext(@io.reactivex.annotations.NonNull String s) {
                            ToastUtils.showShort("子线程结束了：" + s);
                            cameraRecordCallBack(s);
                        }

                        @Override
                        public void onError(@io.reactivex.annotations.NonNull Throwable e) {

                        }

                        @Override
                        public void onComplete() {

                        }
                    });