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Retry a call with Retrofit 2 and RxJava2 after displaying a dialog

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被撕碎了的回忆 2021-02-04 17:32

I\'m calling an API using Retrofit 2 and RxJava2. If a call fails, in some cases (e.g. no Internet connection), I want to display an error dialog to the user and let him retry.<

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  • 迷失自我
    迷失自我 (楼主)
    2021-02-04 17:55 

    final PublishSubject retrySubject = PublishSubject.create();

disposable.add(getData()
    .doOnError(throwable -> enableButton())
    .retryWhen(observable -> observable.zipWith(retrySubject, (o, o2) -> o))
    .subscribeWith(/* do what you want with the result*/)
}));



    When button is clicked you trigger this event:
    


    retrySubject.onNext(new Object());

    


    As you can see in this Marble diagram:
    


    


    the error is not propagated. The retryWhen operator will indeed handle it and do a proper action. This is the reason why you have to enable (or for example show a Dialog) in doOnError, before retryWhen operator.
    


    When you don't want to listen anymore for successive retry attempts, you just need to unsubscribe:
    


    disposable.dispose();

    


    As per your question:
    


    
  
    What should I do if I want to retry only on a specific Exception but
  not on the other ones?
    

    


    You can modify your retryWhen in this way:
    


    .retryWhen(throwableObservable -> throwableObservable.flatMap(throwable -> {
      if (throwable instanceof TargetException) {
          return Observable.just(throwable).zipWith(retrySubject, (o, o2) -> o);
      } else {
          throw Throwables.propagate(throwable);
      }
}))

    


    Where Throwables.propagate(throwable) is a Guava util that can be replaced with throw new RuntimeException(throwable);
    
    
    
             
    
                                                        
    
            
            
    
              
                
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