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Editorial Team
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Asked: 2026-06-17T14:31:24+00:00

I’m new to Android, and I’m trying to learn how to use Gson to

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I’m new to Android, and I’m trying to learn how to use Gson to parse an API call. I’ve read around a little bit, and I’m trying to follow this example: http://www.javacodegeeks.com/2011/01/android-json-parsing-gson-tutorial.html

It’s going relatively well, but when I imported the project into Eclipse to get a better look at the code, I encountered the error above regarding constructors (as well as a few other confusing errors).

I read some related questions here on StackOverflow, but they all involve inherited classes, and, I may be terribly confused, but I didn’t think this class was inherited.

What is causing these errors, and how can I fix them?

If you want a link the the project without digging through the article, it’s available here: http://dl.dropbox.com/u/7215751/JavaCodeGeeks/AndroidJsonParsingTutorial/AndroidJsonProject.zip

Here is the code from the file in question:
package com.javacodegeeks.android.json.model;

import com.google.gson.annotations.SerializedName;

public class SearchResponse {

public List<Result> results;

@SerializedName("max_id")
public long maxId;

@SerializedName("since_id")
public int sinceId;

@SerializedName("refresh_url")
public String refreshUrl;

@SerializedName("next_page")
public String nextPage;

@SerializedName("results_per_page")
public int resultsPerPage;

public int page;

@SerializedName("completed_in")
public double completedIn;

@SerializedName("since_id_str")
public String sinceIdStr;

@SerializedName("max_id_str")
public String maxIdStr;

public String query;

}

Thanks in advance.

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1 Answer

  1. Editorial Team

    Your research is correct – the mentioned error is related to constructors and inheritance.
    It seems that somewhere in your project, you have an Employee class, and that class does not declare a public (or at least protected) null constructor (i.e. a constructor that takes no parameters).

    In the provided sample code I could not find any mention of such a class – perhaps something you added to experiment with?

    Any case, adding a null constructor to the mentioned Employee class should make some of your problems go away.

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