Volley Not making request on latest version of Android

j_timko :

I noticed my app wasn't working on Pixel 3. I went into android studio and emulated a few devices and noticed it is not working on any Android Pie (API 28) devices, but works fine on any other. I put a few logs throughout my code, and it seemed that I was not getting a response within my Volley usage. The app itself loads, but does not display any data, and I receive an error

E/RecyclerView: No adapter attached; skipping layout

My code is

import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.support.v7.app.AppCompatActivity;
import android.view.WindowManager;
import com.android.volley.Request;
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.JSONObject;

public class MainActivity extends AppCompatActivity {
    DatabaseManagement db;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(R.layout.activity_main);
        db = new DatabaseManagement(this);
        grabData();
        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                Intent i = new Intent(MainActivity.this, com.hellapunk.hellapunk.feature.Main2Activity.class);
                startActivity(i);
                finish();
            }
        }, 3000);
    }

    public void grabData() {
        //Log.i("Made it", "You made it this far");
        String url = "http://hellapunk.com/listallshows.php?id=2018";
        StringRequest sr = new StringRequest(Request.Method.GET, url, new Response.Listener<String>() {
            @Override
            public void onResponse(String response) {
                try {
                    JSONArray showInfo = new JSONArray(response);
                    Log.i("Something", "response");
                    for (int i = 0; i < showInfo.length(); ++i) {
                        JSONObject showInfo1 = showInfo.getJSONObject(i);

                        if ((db.checkShow(showInfo1.getString("show_summary"),
                                showInfo1.getString("show_date"))) > 0) {
                            Log.i("Results", "Show already exists");
                        } else {
                            db.insertShows(showInfo1.getString("show_summary"),
                                    showInfo1.getString("venue_name"),
                                    showInfo1.getString("show_date"),
                                    showInfo1.getString("shows_img"),
                                    showInfo1.getString("venue_address"),
                                    showInfo1.getString("city_name"),
                                    showInfo1.getString("city_region"));
                        }
                    }
                } catch (Exception e) {
                    Log.i("Error", e.getMessage());
                }
            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                Log.i("TAG", ""+error);
            }
        });
        Volley.newRequestQueue(this).add(sr);

    }
}

I grab the data during my splash screen and store it into a local database. Then it is called from the db on the next Activity. Any advice will be appreciated!

Kevin Coppock :

This is because starting with Android P, any network traffic between your app and insecure destinations must be explicitly whitelisted. See Protecting users with TLS by default in Android P.

In your code, you're making a request to:

http://hellapunk.com/listallshows.php?id=2018

The http:// shows that the site is not secure. If you dig deeper into your LogCat you'll likely find a message such as:

com.android.volley.NoConnectionError: java.io.IOException: Cleartext HTTP traffic to hellapunk.com not permitted
    at com.android.volley.toolbox.BasicNetwork.performRequest(BasicNetwork.java:177)
    at com.android.volley.NetworkDispatcher.processRequest(NetworkDispatcher.java:120)
    at com.android.volley.NetworkDispatcher.run(NetworkDispatcher.java:87)
 Caused by: java.io.IOException: Cleartext HTTP traffic to hellapunk.com not permitted
    at com.android.okhttp.HttpHandler$CleartextURLFilter.checkURLPermitted(HttpHandler.java:115)
    at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:458)
    at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:407)
    at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getResponseCode(HttpURLConnectionImpl.java:538)
    at com.android.volley.toolbox.HurlStack.executeRequest(HurlStack.java:99)
    at com.android.volley.toolbox.BasicNetwork.performRequest(BasicNetwork.java:131)
    at com.android.volley.NetworkDispatcher.processRequest(NetworkDispatcher.java:120) 
    at com.android.volley.NetworkDispatcher.run(NetworkDispatcher.java:87) 

Attempting it myself, it doesn't appear that the site supports https connections, so in order to reach this particular server from your application, you would need to whitelist the hellapunk.com domain manually.

In your resources directory, define an XML document for your network security configuration (e.g. res/xml/network_security_config.xml):

network_security_config.xml:

<?xml version="1.0" encoding="utf-8"?>
<network-security-config>
    <domain-config cleartextTrafficPermitted="true">
        <domain includeSubdomains="true">hellapunk.com</domain>
    </domain-config>
</network-security-config>

Then, in your AndroidManifest.xml for your application, in the <application> tag, add the attribute:

<application
    android:networkSecurityConfig="@xml/network_security_config"

You should then be allowed to make insecure requests to any domain specified within that file.