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

My simple solution to test if a string is null:

if (s.equals("null")){ ..... }

There are two cases.

The variable (of type String) is null(doesn't exists): == works.

The variable has a null value, *.equals("null") gives te right boolean value.

See the picture.