Get nested JSON object with GSON using retrofit

Question

I\'m consuming an API from my android app, and all the JSON responses are like this:

{
    \'status\': \'OK\',
    \'reason\': \'Everything was fine\',
    \         


        

Answer 1

Had the same problem couple of days ago. I've solve this using response wrapper class and RxJava transformer, which I think is quite flexiable solution:

Wrapper:

public class ApiResponse {
    public String status;
    public String reason;
    public T content;
}

Custom exception to throw, when status is not OK:

public class ApiException extends RuntimeException {
    private final String reason;

    public ApiException(String reason) {
        this.reason = reason;
    }

    public String getReason() {
        return apiError;
    }
}

Rx transformer:

protected  Observable.Transformer, T> applySchedulersAndExtractData() {
    return observable -> observable
            .subscribeOn(Schedulers.io())
            .observeOn(AndroidSchedulers.mainThread())
            .map(tApiResponse -> {
                if (!tApiResponse.status.equals("OK"))
                    throw new ApiException(tApiResponse.reason);
                else
                    return tApiResponse.content;
            });
}

Example usage:

// Call definition:
@GET("/api/getMyPojo")
Observable> getConfig();

// Call invoke:
webservice.getMyPojo()
        .compose(applySchedulersAndExtractData())
        .subscribe(this::handleSuccess, this::handleError);


private void handleSuccess(MyPojo mypojo) {
    // handle success
}

private void handleError(Throwable t) {
    getView().showSnackbar( ((ApiException) throwable).getReason() );
}

My topic: Retrofit 2 RxJava - Gson - "Global" deserialization, change response type