title: Keep soft keyboard open when enter key is pressed
body: <p>Well, I'm trying to prevent the soft keyboard from closing when the user press the "ok" button after editing a text field.
  Actually, what i'm trying to achieve is : when "ok" button is pressed, the field is parsed and if valid, it starts another activity.
  That is easy enough.</p>
  
  <p>But, when the field is not valid, I want the soft keyboard to stay open.
  And that's... a hell more complicated.
  If anyone know how to achieve such a thing...</p>
  
  <p>Thanks in advance.</p>
  
  <p>EDIT : what I mean by the OK button is the OK button from the soft keyboard.</p>