RxJava Retrofit.java

  public void login(final String mac, final String devicesOs, final String appVersion, String userAcct, String userPwd, String memType) {
        getSubscription().add(ApiClient.getInstance().personLogin(mac, devicesOs, appVersion, userAcct, userPwd, memType)
                .doOnSubscribe(new Action0() {
                    @Override
                    public void call() {
                        getView().showLoading();
                    }
                })
                .subscribeOn(Schedulers.newThread())
                .observeOn(AndroidSchedulers.mainThread()) // (a)
                .flatMap(new Func1<PersonLogin, Observable<PersonData>>() {
                    @Override
                    public Observable<PersonData> call(PersonLogin personLogin) {
                        // 此處完全不會call (下Log並沒有call)
                        
                        // 我想在此就處理Ui所以切AndroidSchedulers.mainThread()  (a)處
                        
                        // return 這個Api又必須切到新的Thread去做 所以 (1)處call.subscribeOn(Schedulers.newThread())
                        return ApiClient.getInstance().queryPersonData(mac, devicesOs, appVersion, personLogin.getUId(), personLogin.getSessionId());
                    }
                })
                .subscribeOn(Schedulers.newThread()) // (1)
                .observeOn(AndroidSchedulers.mainThread()) // (2)
                .subscribe(new Observer<PersonData>() {
                    @Override
                    public void onCompleted() {
                    }

                    @Override
                    public void onError(Throwable e) {
                      // 此處拿到 main thread
                      Log.d(TAG, Thread.currentThread().getName());
                      
                      // 如果call 如 Toast or e.getMessage();
                      // 此處噴 Can't create handler inside thread that has not called Looper.prepare()
                    }

                    @Override
                    public void onNext(PersonData personData) {
                       // 我想在此處也處理Ui所以切AndroidSchedulers.mainThread()   (2)處
                    }
                }));
    }