CODEWITHSUNDEEP
androidjsongsondeserialization
moondaisy
moondaisy

Reputation: 4491

Gson().fromJson returns null in Android

I'm trying to deserialize an error message I get from an api, this is my string:

{"Message":"Ya existe un usuario registrado con ese email"}

But when I call Gson like this it returns a NetworkError with null values:

String message = new Gson().fromJson(jsonMessage, NetworkError.class).getMessage();

I have been looking at similar questions and realize there has to be something wrong in the NetworkError class but I can't figure out what it is. Here is the class:

public class NetworkError {

    private String message;

    public NetworkError(final String message) {
        this.message = message;
    }

    public String getMessage() { return message; }
}

I have tried by including a set method and an empty constructor but I still got null. Thanks

Upvotes: 0

Views: 2006

Answers (2)

Mikel Pascual
Mikel Pascual

Reputation: 2211

Keys in JSON are case sensitive. Therefore, Gson is looking for the "message" key, which is not there (you are using the "Message" key).

You can just do:

@SerializedName("Message")
private String message;

Upvotes: 2

Shobhit Puri
Shobhit Puri

Reputation: 26007

Inside NetworkError.java class, try changing your message variable in the class to Message, since that is the key you are receiving in the REST response and it might be causing issues when mapping the key.

I can understand that you still might want to use camel case for your variable names. You can use @SerializedName annotation to keep your variable name anything you want but still have GSON map to it. You can read more on what is the basic purpose of @SerializedName annotation in android using GSon

Upvotes: 4

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