@param recipient the receiver,if register in activity the recipient always set "this", and "Messenger.getDefault().unregister(this)"

send the message type of T, all receiver can receive the message @param message any object can to be a message @param <T> message data type

send message to target with token,when a receiver has register with same token,it will receive this msg @param token send with a unique token,when a r

Unregister the receiver such as: Messenger.getDefault().unregister(this)" in onDestroy in the Activity is required avoid to memory leak! @param recip

like {@link ReplyCommand},but ResponseCommand can return result when command has executed! @param execute function to execute when event occur.