JsonHelper.java

import com.google.gson.Gson;
import java.util.Arrays;
import java.util.List;

/**
 * Created by TarekkMA on 5/10/16.
 * www.FaceBook.com/tarekkma1
 */
public class JsonHelper {
    private static final String TAG = "JsonHelper";

    /**
     * Convert any object to json string
     * @param o The object you wish to convert
     * @return      String containing the converted json 
     */
    public static String objectToJson(Object o){
        return new Gson().toJson(o);
    }

    /**
     * Method to convert json to any object using generics
     * @param json The json string you wish to convert
     * @param clazz class of the object you desire
     * @return      The object that you passed its class
     */
    public static <T> T jsonToObject(String json,Class<T> clazz){
        return new Gson().fromJson(json, clazz);
    }

    /**
     * Method to convert json to list of any object using generics
     * @param json The json string you wish to convert
     * @param clazz Array class of the object you desire
     * @return      List of the object you pass its array class
     */
    public static <T> List<T> jsonToList(String json,Class<T[]> clazz){
        T[] array = new Gson().fromJson(json, clazz);
        return Arrays.asList(array);
    }

}