question: private void onSkillButtonClicked ( ) { if ( skillTree == null ) { Intent i = new Intent ( getContext ( ) , SkillTreeListActivity . class ) ; i . putExtra ( ASBActivity . EXTRA_FROM_TALISMAN_EDITOR , true ) ; i . putExtra ( ASBActivity . EXTRA_TALISMAN_SKILL_INDEX , skillIndex - 1 ) ; parent . startActivityForResult ( i , ASBActivity . REQUEST_CODE_CREATE_TALISMAN ) ; } else { setSkillTree ( null ) ; } }
target:  Called when the user clicks the button next to the skill tree. 