Question

这是我的代码，我想从db填充List然后使用它当然，但是我遇到了问题，它正在做asychronouz并且当我试图从这个列表中获取值，我已经超出了绑定异常，我该如何重新设置这个方法，或者我应该如何从Mainactivity调用来解决这个问题呢？

public class VolleySingleton extends Application {
public static final String TAG = VolleySingleton.class.getSimpleName();
private RequestQueue requestQueue;
private static VolleySingleton instance;
public static int count=0;

@Override
public void onCreate() {
    super.onCreate();
    instance = this;
}

public static synchronized VolleySingleton getInstance() {
    return instance;
}

public RequestQueue getRequestQueue() {
    if (requestQueue == null) {
        requestQueue = Volley.newRequestQueue(getApplicationContext());
    }
    return requestQueue;
}

public <T> void addToRequestQueue(Request<T> req, String tag) {
    req.setTag(TextUtils.isEmpty(tag) ? TAG : tag);
    getRequestQueue().add(req);
    count++;
}

public <T> void addToRequestQueue(Request<T> request) {
    getRequestQueue().add(request);
}

public void cancelPendingRequests(Object tag) {
    if (requestQueue != null) {
        requestQueue.cancelAll(tag);
    }
}

}

private static String TAG = JSonParse.class.getSimpleName();

public static List<Room> getRoomArray(String url, Context context) throws InterruptedException {
    final List<Room> roomList = new ArrayList<>();
    final CountDownLatch countDownLatch = new CountDownLatch(1);
    JsonArrayRequest arrayRequest = new JsonArrayRequest(url, new Response.Listener<JSONArray>() {
        @Override
        public void onResponse(JSONArray response) {
            Log.d(TAG, response.toString());
            try {
                Room room = null;
                for (int i = 0; i < response.length(); i++) {
                    room = new Room();
                    JSONObject newRoom = (JSONObject) response.get(i);
                    room.setId(newRoom.getLong("id"));
                    room.setName(newRoom.getString("name"));
                    room.setActive(newRoom.getBoolean("active"));
                    roomList.add(room);
                }
                Helper.initList(roomList);
            } catch (JSONException e) {
                e.printStackTrace();
            }

        }
    }, new Response.ErrorListener() {

        @Override
        public void onErrorResponse(VolleyError volleyError) {
            volleyError.printStackTrace();
        }
    });

    VolleySingleton.getInstance().addToRequestQueue(arrayRequest);
    return roomList;
}

Answer 1

您可以在

中处理数据

public void onResponse(JSONArray response) { //process response }

在onResponse上，Volley完成了它的工作。您可以在此处设置回调以在班级中发送回复。

如果齐射完成工作怎么办？

1 个答案: