Count the Internet Bytes

Here is the code to see if my Android has an Internet connection. I want to know if there is any method to count the Bytes, Kylobytes that are entering my application; obviously not going to download anything just want me to pull the megabytes like a meter or accumulator.

public void conexion2(){
    ConnectivityManager cm;
    NetworkInfo ni;

    cm = (ConnectivityManager) this.getSystemService(Context.CONNECTIVITY_SERVICE);
    ni = cm.getActiveNetworkInfo();
    boolean tipoConexion1 = false;      

    if (ni != null) {
        ConnectivityManager connManager1 = (ConnectivityManager)this.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo mWifi = connManager1.getNetworkInfo(ConnectivityManager.TYPE_WIFI);

        if (mWifi.isConnected()) {
            tipoConexion1 = true;
            Toast.makeText(this, "Red wifi encontrada", Toast.LENGTH_LONG).show();
            dp.setProgress(100);
        }
    }
    else {
        Toast.makeText(this, "NO Hay conexion", Toast.LENGTH_LONG).show();
    }
}