package Ġdol phin . android . apps . Blood Service App . ui Ċ Ċ interface ĠOn Blood Center Change Speaker Ġ{ ĊĠĠĠ Ġfun Ġregister On Blood Center Changed ( listener : ĠOn Blood Center ChangeListener ?) ĊĠĠĠ Ġfun Ġunregister On Blood Center Changed ( listener : ĠOn Blood Center ChangeListener ?) Ċ } Ċ