android: check if the string not only white spaces

Question

How can I check if a string contains anything other than whitespace?
This code didn't work:

String string = "   \n\n\t\t     ";
if(string.length()==0) doSomething();

since spaces and new lines have values.

Can anyone tell me how can I do it?

Note: minSDKVersion = 5

Regards :)

Answer 1

Try this:

if (string.trim().length() == 0) { /* all white space */ }

Alternatively, you can use a regular expression:

if (string.matches("\\w*")) { . . . }

Answer 2

try:

if (string == null || TextUtils.isEmpty(string.trim()) doSomething();