在我的应用程序中，我使用以下方法.它根据给定的id找到一个对象，并通过Gson对其进行解析并将其保存到相应的对象中.

In my application I use following method. It finds an object according to given id parses it via Gson and saves it to corresponding object.

 public MyEntity getValue(String id) {
        DB db = SessionManager.getInstance().db;
        DBCollection collection = db.getCollection("myCollection");
        BasicDBObject query = new BasicDBObject("_id", id);
        Object object = new Object();
        boolean found = false;

        DBCursor cursor = collection.find(query);
        try {
            while (cursor.hasNext()) {
                found = true;
                String str = (cursor.next().toString());
                Gson gson = new Gson();

                object = gson.fromJson(str, MyEntity.class);

            }
        } finally {
            cursor.close();
        }
        if (!found)
            return new MyEntity();
        MyEntity myEntity = null;
        myEntity = (MyEntity) object;
        return myEntity;
    }