我注意到我的应用程序无法在 Pixel 3 上运行。我进入 android studio 并模拟了一些设备,发现它无法在任何 Android Pie (API 28) 设备上运行,但在任何其他设备上运行良好。我在我的代码中放置了一些日志,看起来我在 Volley 使用中没有得到响应。应用程序本身加载,但不显示任何数据,我收到错误
E/RecyclerView: No adapter attached; skipping layout
我的代码是
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);
}
}
我在启动画面期间抓取数据并将其存储到本地数据库中。然后在下一个 Activity 中从数据库调用它。任何建议将不胜感激!
最佳答案
这是因为从 Android P 开始,您的应用与不安全目的地之间的任何网络流量都必须明确列入白名单。参见 Protecting users with TLS by default in Android P .
在您的代码中,您请求:
http://hellapunk.com/listallshows.php?id=2018
http://
表明该站点不安全。如果深入了解 LogCat,您可能会发现一条消息,例如:
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)
自己尝试了一下,网站似乎不支持https
连接,因此为了从您的应用程序到达此特定服务器,您需要将 hellapunk.com
列入白名单手动域。
在您的资源目录中,为您的网络安全配置定义一个 XML 文档(例如 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>
然后,在您的 AndroidManifest.xml
中对于您的应用程序,在 <application>
标签,添加属性:
<application
android:networkSecurityConfig="@xml/network_security_config"
然后您应该被允许向该文件中指定的任何域发出不安全的请求。
关于java - Volley 未在最新版本的 Android 上发出请求,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/54176034/