如何檢查設備是否可以通過活動WiFi連接訪問Internet？

Question

我指的是設備連接到接入點但出於某種原因被禁止使用此AP訪問互聯網的情況。

Answer 1

這些看起來像的東西，可以解決這個問題：

How to do a true Java ping from Windows?

How to check if internet connection is present in java?

Detect internet Connection using Java

Answer 2

private boolean connectionAvailable() { 
    boolean connected = false; 
    ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE); 
    if (connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState() == NetworkInfo.State.CONNECTED) { 
     //we are connected to a network 
     connected = true; 
    } 
    return connected; 
} 

Answer 3

用於檢查無線網絡連接啓用與否

WifiManager wfManager = (WifiManager)getSystemService(Context.WIFI_SERVICE); 
if(wfManager.isWifiEnabled()) 
{ 
    //Code 
} 
else 
{ 
//Code 
} 

進行檢查互聯網連接..

public boolean isOnline() 
{ 
    ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE); 
    NetworkInfo netInfo = cm.getActiveNetworkInfo(); 

    if (netInfo != null && netInfo.isConnectedOrConnecting()) 
    { 
      //Try This 
      int i =netInfo.getType() ; 
      System.out.println("Net Type ="+i);  

      return true; 
    } 
    return false; 

}