Android截击错误D/截击：[486]基本网络。日志任务：

Question

我正在尝试使用Volley获取JSON对象以创建动态自动完成，但在使用Volley请求时，我在日志cat中看到：

截击：[486]基本网络。logSlowRequests：请求的HTTP响应=

这些答案并没有解决我的问题。

这里是初始化请求队列的Singleton类：

import android.content.Context;

import com.android.volley.DefaultRetryPolicy;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.toolbox.Volley;

public class SingleTon {
    private Context context;
    private RequestQueue requestQueue;
    public static SingleTon singleTon;
    public SingleTon(Context context){
        this.context=context;
        requestQueue=getRequestQueue();
    }
    private RequestQueue getRequestQueue(){
        if(requestQueue==null){
            requestQueue= Volley.newRequestQueue(context);
        }
        return requestQueue;
    }
    public synchronized static SingleTon getInstance(Context context){
        if(singleTon==null){
            singleTon=new SingleTon(context.getApplicationContext());
        }
        return singleTon;
    }
    public void addToRequestQueue(Request request){
        requestQueue.add(request).setRetryPolicy(new DefaultRetryPolicy([I have tried all possible combinations here]));
    }
}

发出请求的方法：

public Filter getFilter() {
    Filter filter=new Filter() {
        @Override
        protected FilterResults performFiltering(CharSequence charSequence) {
            FilterResults filterResults=new FilterResults();
            if(charSequence!=null){
                String partialName=charSequence.toString();
                String url="https://api.railwayapi.com/v2/suggest-train/train/"+partialName+"/apikey/xnlo6zq3yj/";
                HTTPConnector httpConnector=new HTTPConnector(url,context);
                JSONObject response=httpConnector.getJsonResponse();
                try {
                    JSONArray trains=response.getJSONArray("trains");
                    for(int i=0;i<trains.length();i++){
                        trainName.add(new Train(trains.getJSONObject(i).getString("number")));
                    }
                } catch (JSONException e) {
                    e.printStackTrace();
                }
                filterResults.values=trainName;
                filterResults.count=trainName.size();
            }
            return filterResults;
        }

下面是HTTP Connector类：

package com.example.mukhe.dynamicautocomplete;

import android.content.Context;
import android.util.Log;
import android.widget.Toast;

import com.android.volley.DefaultRetryPolicy;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.JsonObjectRequest;
import com.android.volley.toolbox.Volley;

import org.json.JSONObject;

/**
 * Created by mukhe on 06-Feb-18.
 */

public class HTTPConnector {
    String url;
    JSONObject jsonResponse;
    Context context;
    public HTTPConnector(String url,Context context){
        this.url=url;
        this.context=context;
    }

    public JSONObject getJsonResponse() {
        makeQuery();
        return jsonResponse;
    }
    private void makeQuery(){
        JsonObjectRequest request=new JsonObjectRequest(Request.Method.GET, url, null, new Response.Listener<JSONObject>() {
            @Override
            public void onResponse(JSONObject response) {
                jsonResponse=response;
            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                Toast.makeText(context,"ERROR",Toast.LENGTH_SHORT).show();
                Log.d("ERROR: ", error.toString());
            }
        });
        SingleTon.getInstance(context.getApplicationContext()).addToRequestQueue(request);
    }
}

Answer 1

你用截击的方式真奇怪。Volley发出异步HTTP请求。这两行代码不会每次都给出结果

 HTTPConnector httpConnector=new HTTPConnector(url,context);
 JSONObject response=httpConnector.getJsonResponse();

您正在发送async...请求并立即调用getJsonContent函数？当您调用该函数时，您不能确定是否有可用的响应。当您得到响应时，您应该返回响应，即在JsonObjectRequest的OnSolutions方法中

因此，您应该正确地实现HTTPConnector类和包含getFilter方法的类之间的通信。

您可以使用这个接口。在HTTPConnector类中声明接口，并在活动中实现它。

public class HTTPConnector {
    String url;
    JSONObject jsonResponse;
    Context context;
    IMyInterface  mListener;
    public interface IMyInterface
   {
    void sendResponse(JsonObject obj);
   }

    public HTTPConnector(String url,Context context,IMyInterface pListener){
        this.url=url;
        this.context=context;
        mListener=pListener
    }


    public void makeQuery(){
        JsonObjectRequest request=new JsonObjectRequest(Request.Method.GET, url, null, new Response.Listener<JSONObject>() {
            @Override
            public void onResponse(JSONObject response) {
                jsonResponse=response;
             if(mListener!=null)
           {
            mListener.sendResponse(response);
           }
             }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                Toast.makeText(context,"ERROR",Toast.LENGTH_SHORT).show();
                Log.d("ERROR: ", error.toString());
               if(mListener!=null)
                {
                   mListener.sendResponse(null);
                }
            }
        });
        SingleTon.getInstance(context.getApplicationContext()).addToRequestQueue(request);
    }
}

在你的活动中，实现接口并重写接口的sendSolutions方法。

public class MainActivity extends AppCompatActivity implements HTTPConnector.IMyInterface
{
  ...........
  ...........
  // Your other code of activity
  ...........
  ..........

  @Override
  public void sendResponse(JsonObject response)
  {
   try {
       JSONArray trains=response.getJSONArray("trains");
       for(int i=0;i<trains.length();i++){
                    trainName.add(new Train(trains.getJSONObject(i).getString("number")));
                }
               //Now you have response and filled the list, can call getFilter
            } catch (JSONException e) {
                e.printStackTrace();
            }

  }

}

在您的活动中的某个地方，当您有URL的查询文本时。如下图所示发出截击请求。

String url="https://api.railwayapi.com/v2/suggest-train/train/"+partialName+"/apikey/xnlo6zq3yj/";
    HTTPConnector httpConnector=new HTTPConnector(url,context,this); // this will act as your listener
    httpConnector.makeQuery();