Take value for selected checkbox in ng-repeat

I want to be able to select only one checkbox and when select that checkbox to take that value in function in controller.

Controller

$foldersArray = [Folder 1 , Folder 2, Folder 3....];

$selectedFolderName = function(){
   var folderName = 'folder name '
}

View

<div class="checkbox">
  <ui>
    <li ng-repeat="folder in foldersArray">
       <label><input type="checkbox" ng-checked="folder" ng-click=selectedFolderName()"/>{{folder}}</label>
   </li>
  </ui>
</div>