how I can know if a tablet has 3G connection

Question

The question. I'm getting error on this line:

android.net.NetworkInfo.State mobile = con.getNetworkInfo(0).getState(); 

The error you are giving Tablets that have no 3G connection can only connect through WI-FI. Is there a way to ask if the device lacks 3G connection?

Answer 1

Check this list of SO Q&A:

• How to check internet access on Android? InetAddress never timeouts
• Detect network connection type on Android
• Is there a way to detect 2G, 3G, or 4G on Android Device?

Answer 2

if(NetworkInfo.getType == ConnectivityManager.TYPE_MOBILE) {

    // .getState() here
}

Answer 3

Assuming that you are happy to find out whether the tablet has a cellular radio or not, how about:

@Override
public boolean hasCellularRadio() {
    TelephonyManager telephonyManager = (TelephonyManager)
            mContext.getSystemService(Context.TELEPHONY_SERVICE);
    String deviceId = telephonyManager.getDeviceId();
    if (deviceId == null || deviceId.isEmpty()) {
        return false;
    }
    return true;
}