We need to check if device is connected to Internet on making every API call (or call to Remote server). The function below returns true if device is connected to Internet.

//**This function tells whether the device having an Internet connection or not**///

    public static boolean isNetworkAvailable(Context context) 
    {
        ConnectivityManager connectivityManager 
        = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
        //System.out.println(activeNetworkInfo.);
        return activeNetworkInfo != null;
    }

We need to add the following permissions in the Manifest file

  <uses-permission android:name="android.permission.ACCESS&#95;NETWORK&#95;STATE" />   
  <uses-permission android:name="android.permission.INTERNET" />