title: how to validate textfield that allows only 0,1,..9 and . symbol
body: <p>i place 4 textfields in my application.</p>
  
  <p>I need that 4 textfields allows only numbers 0,1...9 and . symbol.</p>
  
  <p>For that i place keyboard numbers&amp;punctuation. it is ok but In <a href="http://www.freeimagehosting.net/uploads/6f28d228b2.jpg" rel="nofollow">my keypad</a> allows   ABC,-,/,(,that all are  activated.</p>
  
  <p>But in my textfield, that allows only 0,1,...9 and . symbol.</p>
  
  <p>How can i done this.</p>
  
  <p>can any one pls help me.</p>
  
  <p>Thank u in advance.  </p>