java - JsonArrayRequest 在 Android Studio 中不起作用 : Can not resolve constructor

Question

我对 Java/Android Studio 很陌生，过去两天我一直在研究这个问题，但没有成功。我不断收到:无法解析构造函数 'JsonArrayRequest(int, java.lang.String, java.lang.String, anonymous com.android.volley.Response.Listener)'

在其他线程上，我看到建议将 null 替换为字符串或将 null 转换为 null 的答案，但这似乎不起作用。

我正在尝试读取 https://www.smartvibes.be/profiles/api/profileview.php?id=5073 处的 JSON 数组例如。

这是我的代码:

package com.smartvibes.smartbeat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;
import android.widget.Toast;

import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.toolbox.JsonArrayRequest;
import com.android.volley.toolbox.Volley;

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

public class profileViewActivity extends AppCompatActivity {
    RequestQueue rs;
    String url,id, nick, age, city, mainpic, numpics, extrapic0, extrapic1, extrapic2, extrapic3, extrapic4, extrapic5;
    TextView profileIntro;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_profile_view);
        Bundle getProfileId = getIntent().getExtras();
        if(getProfileId == null){
            return;
        }
        String profileid = getProfileId.getString("profileid");
        url = "https://www.smartvibes.be/profiles/api/profileview.php?id="+profileid;
        rs = Volley.newRequestQueue(this);
        sendjsonrequest();
        profileIntro = (TextView) findViewById(R.id.profileIntro);
        //profileIntro.setText(profileData.getPnick());
        profileIntro.setText(profileid);
    }

    public void sendjsonrequest(){
        JsonArrayRequest jsonArrayRequest = new JsonArrayRequest(Request.Method.GET, url, "", new Response.Listener<JSONArray>() {
            @Override
            public void onResponse(JSONArray response) {
                try {

                // Get current json Array
                JSONArray profile = new JSONArray(response);
                        JSONObject jresponse = profile.getJSONObject(0);
                        Toast.makeText(profileViewActivity.this, "test", Toast.LENGTH_LONG).show();
                        nick = jresponse.getString("nick");
                        age = jresponse.getString("age");
                        city = jresponse.getString("city");
                        mainpic = jresponse.getString("mainpic");
                        numpics = jresponse.getString("numpics");

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

        });
        rs.add(jsonArrayRequest);
    }
}

当尝试运行它时，我得到:

error: no suitable constructor found for JsonArrayRequest(int,String,String,<anonymous Listener<JSONArray>>)
constructor JsonArrayRequest.JsonArrayRequest(String,Listener<JSONArray>,ErrorListener) is not applicable
(actual and formal argument lists differ in length)
constructor JsonArrayRequest.JsonArrayRequest(int,String,JSONArray,Listener<JSONArray>,ErrorListener) is not applicable
(actual and formal argument lists differ in length)

我可能做了一些(或几件事)不好的事情......但不知道是什么。

Answer 1

你错过了Response.ErrorListener()

使用这个

 JsonArrayRequest jsonArrayRequest = new JsonArrayRequest(
                    Request.Method.GET,
                    url,
                    null,
                    new Response.Listener<JSONArray>() {
                        @Override
                        public void onResponse(JSONArray response) {
                            try {

                 // Get current json Array
                 JSONArray profile = new JSONArray(response);
                          JSONObject jresponse = profile.getJSONObject(0);
                          Toast.makeText(profileViewActivity.this, "test", Toast.LENGTH_LONG).show();
                          nick = jresponse.getString("nick");
                          age = jresponse.getString("age");
                          city = jresponse.getString("city");
                          mainpic = jresponse.getString("mainpic");
                          numpics = jresponse.getString("numpics");

                  } catch (JSONException e) {
                      e.printStackTrace();
                  }
                        }
                    },
                    new Response.ErrorListener(){
                        @Override
                        public void onErrorResponse(VolleyError error){
                            // Do something when error occurred
                            Snackbar.make(
                                    mCLayout,
                                    "Error...",
                                    Snackbar.LENGTH_LONG
                            ).show();
                        }
                    }
            );

希望对你有帮助