it can be achieve through two ways
i devised my own machanism so may b you people have better approach than me please share too.
1) simple
2) advance
1) in simple we can use autocomplete text view and only use single tag with hard coded values which is limitation.
2) i have used a popup page with a Edittext and add button on top and listview with checkboxes below it.
fixed items i have already loaded into list view with checkboxes so that i could select multiple tags.
and in case of if i want to add my custom tag then i use that edit text above list view and store it in temporary data and
then finally using bundle i show selected values where i want seperated by commas.
thats it.