我的应用程序没有显示出互联网在连接到便携式路由器

Question

我有下面的代码检查，如果我有有效的互联网连接：

private boolean hasNetworkAccess() { 
    try { 
     HttpURLConnection urlc = (HttpURLConnection) (new URL("http://www.screens.company").openConnection()); 
     urlc.setRequestProperty("User-Agent", "Test"); 
     urlc.setRequestProperty("Connection", "close"); 
     urlc.setConnectTimeout(3000); 
     urlc.connect(); 
     return (urlc.getResponseCode() == 200); 
    } catch (IOException e) { 
     Log.e("NETWORK", "Error checking internet connection."); 
    } 
    return false; 
} 

当我连接/我的Wi-Fi在家里连接到我的手机热点/直接连接到我的路由器 - 一切正常，它显示我有活动的连接。

当我将我的电脑连接到便携式路由器（TP-LINK）时，出现错误。

什么可能是错误，只是我是我的便携式路由器？

PS我检查，当我连接到像互联网浏览器，YouTube等路由器

错误堆栈跟踪一切工作：

java.net.SocketTimeoutException: failed to connect to www.screens.company/80.179.142.52 (port 80) after 3000ms 

Answer 1

试试这个

• 检查以确保它是connected to a network：

---

public boolean isNetworkAvailable(Context context) { 
    final ConnectivityManager connectivityManager = ((ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE)); 
    return connectivityManager.getActiveNetworkInfo() != null && connectivityManager.getActiveNetworkInfo().isConnected(); 
} 

---

• 替代溶液

---

public boolean isInternetAvailable() { 
    try { 
     final InetAddress address = InetAddress.getByName("www.google.com"); 
     return !address.equals(""); 
    } catch (UnknownHostException e) { 
     // Log error 
    } 
    return false; 
} 

---

-Permission需要

---

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />