java在JsonObjectRequest中写入布尔值

Question

我试图在JSONObjectRequest中写入局部变量。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ID（与共享首选项中已存储的ID不同），然后下载新ID。为此，我想设置我的变量load_full_data = true，然后再向下（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);
}

唯一的问题是，我不能在JSONObjectRequest中引用局部变量。它说它需要final。我怎样才能将数据传入和传出这个系统

Answer 1

您可以创建一个新类，并让它实现您想要丰富其定义的接口，在您的例子中Response.Listener<JSONObject> 我不熟悉这个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();
            }
       }
} 

那么你的客户代码是：

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();

装饰性说明：请遵守代码惯例标准，使代码更具可读性。（例如骆驼箱和无_蛇：）