title: EditText inputType special case to get only number and a special symbol
body: <p>Here is my scenario, </p>
  
  <p>I just wanna get only number and a particular special character like $ at the end of the EditText field.</p>
  
  <p>Ex:    234.34$</p>
  
  <p>I don't wanna validate after entering this input, but rather user can only enter decimal number and at the end this special character.</p>
  
  <p>Some one please help me to do this.</p>