Question

我试图更改方法getPriority（）。手动更改了Priority.LOW ... Priority.IMMEDIATE。但这没有帮助。

MainActivity.java

package com.example.myapplication;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;

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.StringRequest;
import com.android.volley.toolbox.Volley;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {
    private ArrayList<Float> arrayList;
    private static final String NUMBERS_URL = "http://10.0.3.2:80/get_number.php";
    private static final String TAG = "STACKOVERFLOW";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        arrayList = new ArrayList<>();

        Log.d(TAG, "arrayList.size() before calling the method >> " + ((Integer) arrayList.size()).toString());

        loadArrayList();

        Log.d(TAG, "arrayList.size() after calling the method >> " + ((Integer) arrayList.size()).toString());

    }

    private void loadArrayList() {
        StringRequest request;
        RequestQueue requestQueue = Volley.newRequestQueue(this);
        request = new StringRequest(Request.Method.GET, NUMBERS_URL, new Response.Listener<String>() {
            @Override
            public void onResponse(String response) {
                try {
                    JSONArray jsonArray = new JSONArray(response);

                    for(int i = 0; i < jsonArray.length(); i++) {
                        JSONObject jsonObject = jsonArray.getJSONObject(i);
                        arrayList.add((float) jsonObject.optDouble("number"));
                        Log.d(TAG, "jsonObject inside method loadArrayList() >> " + jsonObject.toString());
                    }
                    Log.d(TAG, "arrayList.size() inside method loadArrayList() >> " + ((Integer) arrayList.size()).toString());
                } catch (JSONException e) {
                    e.printStackTrace();
                }
            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                // Use VolleyLog
            }
        }) {
            @Override
            public Priority getPriority() {
                return Priority.IMMEDIATE;
            }
        };
        requestQueue.add(request);
    }
}

Logcat：

03-31 12:38:49.929 5319-5319/? D/STACKOVERFLOW: arrayList.size() before calling the method >> 0
03-31 12:38:49.929 5319-5319/? D/STACKOVERFLOW: arrayList.size() after calling the method >> 0
03-31 12:38:49.989 5319-5319/? D/STACKOVERFLOW: jsonObject inside method loadArrayList() >> {"number":"4.0000"}
03-31 12:38:49.989 5319-5319/? D/STACKOVERFLOW: jsonObject inside method loadArrayList() >> {"number":"2.6667"}
03-31 12:38:49.989 5319-5319/? D/STACKOVERFLOW: jsonObject inside method loadArrayList() >> {"number":"4.0000"}
03-31 12:38:49.989 5319-5319/? D/STACKOVERFLOW: jsonObject inside method loadArrayList() >> {"number":"3.3333"}
03-31 12:38:49.989 5319-5319/? D/STACKOVERFLOW: jsonObject inside method loadArrayList() >> {"number":"4.3333"}
03-31 12:38:49.989 5319-5319/? D/STACKOVERFLOW: jsonObject inside method loadArrayList() >> {"number":"2.6667"}
03-31 12:38:49.989 5319-5319/? D/STACKOVERFLOW: jsonObject inside method loadArrayList() >> {"number":"3.6667"}
03-31 12:38:49.989 5319-5319/? D/STACKOVERFLOW: jsonObject inside method loadArrayList() >> {"number":"4.3333"}
03-31 12:38:49.989 5319-5319/? D/STACKOVERFLOW: arrayList.size() inside method loadArrayList() >> 8

以下也是来自服务器的JSON格式的响应：

[ { “数字”：“ 4.0000” }， { “数字”：“ 2.6667” }， { “数字”：“ 4.0000” }， { “ number”：“ 3.3333” }， { “数字”：“ 4.3333” }， { “数字”：“ 2.6667” }， { “数字”：“ 3.6667” }， { “数字”：“ 4.3333” } ]

通过使用Volley，主线程中的语句未按顺序运行

0 个答案: