compile 'com.google.code.gson:gson:2.8.0'

public class UserInfo {
    private int Id;
    private String Name;
    private String Avatar;
    private boolean IsDelete;

...Setter和Getter方法
}

public class BaseResult {
    private int code;
    private String msg;

...Setter和Getter方法
}

public class DataResult {
    private BaseResult result;
    private List<UserInfo> data;

...Setter和Getter方法
}

        DataResult model = new DataResult();

        List<UserInfo> users = new ArrayList<>();
        //使用for循环添加UserInfo
        for (int i = 0;i < 3;i++){
            UserInfo user = new UserInfo();
            user.setAvatar("/Image/avatar" + i + ".jpg");
            user.setId(i);
            user.setName("旋风小伙" + i);
            user.setDelete(true);
            users.add(user);
        }

        BaseResult result = new BaseResult();
        result.setCode(1);
        result.setMsg("Ok");

        model.setData(users);
        model.setResult(result);

import com.google.gson.Gson;


/**
 * Created by Administrator on 2017/4/17.
 */

public class JsonUtil {

    private static Gson mGson = new Gson();

    public static Object toObject(String json , Class classOfT){
        return  mGson.fromJson(json , classOfT) ;
    }

    public static <T> String toJson(T object) {
        return mGson.toJson(object);
    }
}