Question

我正在尝试写入JSONObjectRequest内部的局部变量。这是我的代码：

JsonObjectRequest get_id_request = new JsonObjectRequest(Request.Method.GET, URL_ID, null,
        new Response.Listener<JSONObject>() {
            @Override
            public void onResponse(JSONObject response) {
                boolean load_full_data = false;
                try {

                    JSONObject jsonNotificationID = response.getJSONObject("n");


                    int notificationID = jsonNotificationID.getInt("id");

                    // Change flag to get full preferences below
                    if(notificationID > currentNotificationID) {
                        load_full_data = true;
                    }

                } catch (JSONException e) {
                    e.printStackTrace();
                }


            }
            @Override
            public void onErrorResponse(VolleyError error) {

            }
        });

我希望能够检查服务器，如果有新的ID（不同于共享首选项中已存储的ID），然后下载新的ID。为此，我想设置变量load_full_data = true，然后进一步设置（取消此请求）：

// Get the IDs, see if they are different.
volleyQueue.add(get_id_request);

if(load_full_data) {
    Log.d(TAG, "run: Load Full Data");
    volleyQueue.add(get_full_request);
}

唯一的是，我无法在JSONObjectRequest中引用局部变量。它说需要final。如何将数据传入和传出？

Answer 1

您可以创建一个新类，并让其实现您想丰富其定义的接口（在您的情况下，Response.Listener<JSONObject> 我不熟悉此API，但示例代码如下：

class MyResponseListener implements Response.Listener<JSONObject> {
      boolean isGoodParam;

      MyResponseListener(boolean isGoodParam) {
         this.isGoodParam = isGoodParam;
      }

      public isGoodParam() {
         return this.isGoodParam;
      }

       @Override
        public void onResponse(JSONObject response) {
            //use your param
            if(this.isGoodParam) {
                doStuff();
            }
       }
}

那么您的客户代码将是：

boolean initialIsGood = true;
MyResponseListener listener = new MyResponseListener(initialIsGood);
JsonObjectRequest getIdRequest = new JsonObjectRequest(Request.Method.GET, URL_ID, null, listener,   
 Response.ErrorListener { error ->
        // TODO: Handle error
    });
//outside of the listener, assuming that the status of the boolean changed and you want to find out the new value
boolean newValue = listener.isGoodParam();

化妆品说明：请遵守代码约定标准，以使代码更具可读性。（例如camelCases和no_snakes：）

写入JsonObjectRequest内部的布尔值

1 个答案: