title: Android: need to validate an edittext for non-blank input
body: <p>If I want to enforce a maximum length of input in an EditText field, I can use the maxLength attribute.  But if I want to enforce a minimum length (in my case, simply non-blank), I find no corresponding minLength attribute.</p>
  
  <p>I've also looked at the various 'inputType' attributes (phone, password, etc) but I don't see anything like 'required' or 'non-blank'.  </p>
  
  <p>I can't believe this would require a custom input filter; it's more likely the answer is so obvious it just doesn't get written down in the form I'm asking the question.</p>