remove onStart method.
Finished PifiFileManager file. combine PackageHandler with PackageHandlerThread.
not correct.
the server can only response once. need to fix this bug.
code works to send multiple files to other side. Not sure whether it works both side.
add click to send request. but once one sent, the other did nothing.
now both sides can click to send request and received relatived files.
now we can receive correct packages.
Succeed send and receive package from single device.succeed close socket and exit threads.
refactor.
add state manager and remove chatconnection.
Refactor finished. Removed unused code. make FileManager singleton.Added StateManager. 1. FileUtil and move related functions there. 2. Test two phones.