java.net.UnknownHostException：无法解析主机＆＃34; api.openweathermap.org＆＃34;：没有与主机名关联的地址

Question

请帮助调试以下代码 我确定了

1.我的设备可以访问Internet。

2.我的Android Manifest文件具有互联网权限。

import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
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.VolleyError;
import com.android.volley.toolbox.JsonObjectRequest;
import com.android.volley.toolbox.Volley;
import org.json.JSONException;
import org.json.JSONObject;

public class MainActivity extends AppCompatActivity {

    private StringBuilder stringBuilder = null;
    private RequestQueue requestQueue;
    private String url = "http://api.openweathermap.org/data/2.5/weather?q=London,uk&appid=48b076c80a0b064d62117d19015db014";
    private TextView textView;

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


        textView = (TextView) findViewById(R.id.temp);

        JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.GET, url, null,
                new Response.Listener<JSONObject>() {
                    @Override
                    public void onResponse(JSONObject response) {

                        try {
                            JSONObject jsonObject = response.getJSONObject("main");
                            float tempr = (float) jsonObject.getDouble("temp");
                            stringBuilder.append(tempr);

                            textView.setText(stringBuilder.toString());
                        } catch (JSONException e) {
                            e.printStackTrace();
                        }
                    }
                }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                Toast.makeText(getApplicationContext(), error.getMessage().toString(), Toast.LENGTH_LONG).show();
                Log.v("Not working", error.getMessage().toString());

            }
        });
        requestQueue = Volley.newRequestQueue(this);
        requestQueue.add(jsonObjectRequest);
    }
}

logcat显示以下报告：

  

java.net.UnknownHostException：无法解析主机   ＆＃34; api.openweathermap.org＆＃34;：没有与主机名相关联的地址

的AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="androidhive.com.volley5">

<uses-permission android:name="android.permission.INTERNET"/>
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
       <activity
           android:name=".MainActivity"
           android:label="@string/app_name"
           android:theme="@style/AppTheme.NoActionBar">
           <intent-filter>
               <action android:name="android.intent.action.MAIN" />

               <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
     </application>

   </manifest>