How to check internet connection before app starts and while it is running?

Question

I found a lot of answer about this but unable to implement those also. I want to implement this code here but not able to do so.

This code I found on google documentatio

Answer 1

 protected boolean isNetworkAvilable() {
        boolean isNetworkAvilable = false;
        ConnectivityManager manager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo info = manager.getActiveNetworkInfo();
        if (info != null && info.isAvailable() && info.isConnected()) {
            isNetworkAvilable = true;
        }
        return isNetworkAvilable;
    }