Android check null or empty string in Android

Question

In my trying AsyncTask I get email address from my server. In onPostExecute() I have to check is email address empty or null

Answer 1

Checking for empty string if it is equal to null, length is zero or containing "null" string

public static boolean isEmptyString(String text) {
        return (text == null || text.trim().equals("null") || text.trim()
                .length() <= 0);
    }