android：如何檢測網絡是否已連接到互聯網

Question

我有此代碼來檢查互聯網連接。

NetworkInfo info = ((ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE)).getActiveNetworkInfo();

             //if network is active and have internet connection 
            if(info != null && info.isConnected()==true){


            //Some code


            }

     //if network is inactive or doesn't  have internet connection 
     else   if(info == null || info.isConnected()==false){

               Context context = getApplicationContext();
               CharSequence text = " Bad internet connection.";
               int duration = Toast.LENGTH_LONG;
               Toast toast = Toast.makeText(context, text, duration);
               toast.show();

             }

當我啟動程序時，打開互聯網連接一切正常，但是當我從路由器拔出互聯網電纜，並且在我的應用程序中仍然打開wifi時，應用程序就可以做到這一點（if（info！= null && info .isConnected（）== true））並崩潰。我不知道為什么這段代碼為true。

Answer 1

Use this for check condition of network:

if (info!=null && info.isAvailable() && info.isConnected()) {
            return true;
        } else {
            return false; 
        }
}