public < T extends Widget & Checkable > boolean addOnCheckChangedListener ( OnCheckChangedListener listener ) { final boolean added ; synchronized ( mListeners ) { added = mListeners . add ( listener ) ; } if ( added ) { List < T > c = getCheckableChildren ( ) ; for ( int i = 0 ; i < c . size ( ) ; ++ i ) { listener . onCheckChanged ( this , c . get ( i ) , i ) ; } } return added ; }
Add a listener to be invoked when the checked button changes in this group .