void function ( ) { mFCMListener = null ; }
unregister listener . no longer need to notify . concode_field_sep FCMListener mFCMListener concode_elem_sep FCMManager instance concode_elem_sep Context mContext concode_elem_sep BroadcastReceiver mMessageReceiver concode_field_sep void init concode_elem_sep void onMessage concode_elem_sep void subscribeTopic concode_elem_sep FCMManager getInstance concode_elem_sep void unSubscribeTopic concode_elem_sep void onReceive concode_elem_sep void registerListener