三行情诗

Observable.just("Marry me!").retryWhen(new Func1<Observable<? extends Throwable>, Observable<Long>>() {
        @Override public Observable<Long> call(Observable<? extends Throwable> throwableObservable) {

          return throwableObservable.zipWith(Observable.range(1, Integer.MAX_VALUE),
                                             new Func2<Throwable, Integer, Integer>() {
                                               @Override public Integer call(Throwable throwable, Integer i) {

                                                 return i;
                                               }
                                             }).concatMap(new Func1<Integer, Observable<? extends Long>>() {
            @Override public Observable<? extends Long> call(Integer retryCount) {

              return Observable.timer((long) Math.pow(2, retryCount), TimeUnit.SECONDS);
            }
          });
        }
      }).subscribe(new Subscriber<String>() {
        @Override public void onCompleted() {
          /*Never completed*/
        }

        @Override public void onError(Throwable e) {
          /*No failure*/
        }

        @Override public void onNext(String s) {
          /*Endless  love*/
        }
      });