In spinner items if select particular item means only the edit text has be go enable and get item to add spinner

I am beginner to android... Am trying following: In list of spinner items if select the one particular item (Example:Extra) means only the edittext text has to go enable.Remaining times it want to be disable..And I've to add extra item while select the particular item..... T开发者_开发百科he sample code will help me lot...Thank you

Write the EditText Visible code in Spinner.setOnItemSelectedListener() in that u check the selected item text is Extra u write the visible code there