android - How to restrict the EditText to accept only alphanumeric characters -

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How can I restrict EditText to accept alphanumeric characters only, both lowercase and Showing uppercase letters EditText ? 

 in  as uppercase & amp; EditText Android: id = "@ + id / userInput" Android: layout_width = "fill_parent" android: layout_height = "wrap_content" android: inputType = "textMultiLine" Android: minLines = "3" & gt; & Lt; Requestfocus / & gt; & Lt; / EditText>   
 If a user shortens the typewriter "abcd", then  EditText  will automatically show the uppercase "ABCD" without the need to restrict the keyboard in uppercase. needed.   
 
 
 
  
 
  
 
  
 p> / code>

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