使用gson将枚举作为单例转换为JSON

Question

I have singleton implementation of enum as below :

public enum DeviceDetail{

    INSTANCE;  
    private  Context context = null;
    private  int handlercheck = 0;
    private  String network = "";
    private  String deviceInfo = "NoData";
    private  String androidVersion = "";
    private  String appVersion = "";
    private  String appName = "";
    private  String deviceID;
    private  String deviceinfo;

    public void initilize(){
           // deviceInfo = getDeviceInfo();
            networktype = getNetworktype(context);
            deviceID = getDeviceID(context);
            //androidVersion = getAndroidVersion();
            appVersion = getAppVersion(context);
            appName = getAppName(context);
    }    
    DeviceDetail(){
        deviceInfo = getDeviceInfo();
        androidVersion = getAndroidVersion();
        initilize();

    }

    public static DeviceDetail getInstance() {
        return DeviceDetail.INSTANCE;
    }
}

I want to convert this DeviceDetail to JSON using GSON, for that I have written

public static String convertObjectToJsonString(DeviceDetail deviceData)    {
        Gson gson = new Gson();
        return gson.toJson(deviceData);
    }

I am calling this method as

convertObjectToJsonString(DeviceDetail.INSTANCE)

but it only returns me the string "INSTANCE" not key value pairs as it does for objects. Suggest the changes need to be made so that I get string with all fields in enum in key value JSON.

Answer 1

I have ended up in using a not so elegant workaround as below :

public static String convertObjectToJsonString(DeviceDetail deviceData) {
        // Gson gson = new Gson();
        // GsonBuilder gb = new GsonBuilder();
        JsonObject jsonObject = new JsonObject();
        jsonObject.addProperty("androidVersion", deviceData.getAndroidVersion());
        jsonObject.addProperty("appName", deviceData.getAppName());
        jsonObject.addProperty("appVersion", deviceData.getAppVersion());
        jsonObject.addProperty("networkType", deviceData.getNetworktype());
        jsonObject.addProperty("deviceInfo", deviceData.getDeviceInfo());
        jsonObject.addProperty("deviceID", deviceData.getDeviceID());
        jsonObject.addProperty("city", deviceData.getCity());
        jsonObject.addProperty("country", deviceData.getCountry());
        //jsonObject.addProperty("appName",deviceData.getAppName());

        return jsonObject.toString();
    }