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 AndroidIntroduction

Hello Threads

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Goal Create an application

that uses abackground thread

as a UD ser!er torecei!e "essages#ro" the UD client

1$2.%.2%%.12$

Te&t sent #ro" UDClient

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Layout

1$2.%.2%%.12$

Te&t sent #ro" UDClient

Te&t(ie) that changes#ro" *Starting Ser!er+ to

 *Ser!er Started+ ,optional-

Te&t(ie) that sho)s thete&t sent #ro" UDClient

Te&t(ie) that sho)s the address o# the ser!er,needed #or UDClient-

Clear /utton clears theLast Message ,and sho)sthat inter#ace is stillresponsi!e-

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 Application Structure

Main cti!it Ser!erThread UDClient

3nCreate, -  Create the thread

  Start the thread 

3nDestro, -  close the socket

Constructor  3pen the Socket

  # success#ul *Ser!er Started+   4ind and displa the ddress

run, -  )hile ,socketStill3pen-5  recei!e packet  displa Message  send repl

  6

7ead line #ro" input

Send line to Ser!er

7ecei!e line #ro" Ser!er

Displa line3nClickListener, -  Clear the Last Message

MessageHandler

HelloThreads UDClient

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Main Activity

(HelloThreads) ClassMe"bersTe&t(ie) is7unning8"ddress4ield8lastMessage9

/utton clear9

Ser!erThread "Thread9

Handler

3nCreate, - :et handles ,#ind(ie)/d- to all :U ele"ents

Create Ser!erThread; "Thread

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The Handler Defnition private final Handler "Handler < new Handler,- 5

  public void handleMessage,Message "sg- 5

  switch ,"sg.)hat- 5

  case PACKET_CAME ;

  String inco"ingMessage < ,String- "sg.ob>9

  lastMessage.setTe&t,inco"ingMessage-9

  break9   case IS_RUNNING;

  String socketStatus < ,String- "sg.ob>9

  is7unning.setTe&t,socketStatus-9

  break9

  case IP_ADDRESS;

  netddress "ddress < ,netddress- "sg.ob>9

  "ddress4ield.setTe&t,?Ser!er ddress;?"ddress.toString,--9

  break9

  6

  6

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@2010 Mihail L. Sichitiu A

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ServerThread public class Ser!erThread e&tends Thread

Class Me"bers Handler "Handler9 link to the Message Handler

Conte&t "Conte&t9 link to application conte&t

Datagra"Socket ser!erSocket9 the UD socket )ell recei!e at

public Ser!erThread,Conte&t currentConte&t8Handler handler-5 "Conte&t < currentConte&t9

"Handler < handler9

3pen the socket9 i# success#ul

"Handler.obtainMessage,HelloThreads2.SE7U===:8 ?Ser!erStarted?-.sendToTarget,-9

netddress " < getMFi4iddress,-9 "Handler.obtainMessage,HelloThreads2.EDD7GSS8 "-.sendToTarget,-9

public !oid closeSocket,- ser!erSocket.close,-9

public !oid run,-

llo)s the socket tobe closed ,call #ro"3nDestro,--

3n =e&tage

3n =e&t=e&t age

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Getting the IP AddressgetMy!i"iIPAddress( )#

Fi#iManager "Fi#i < ,Fi#iManager-,"Conte&t.getSste"Ser!ice,Conte&t.F4ESG7(CG--9

Fi#in#o in#o < "Fi#i.getConnectionn#o,-9

Dhcpn#o dhcp < "Fi#i.getDhcpn#o,-9

int "ntegerddress < dhcp.ipddress9

bteIJ Kuads < ne) bteI%J9#or ,int k < 09 k %9 k-

KuadsIkJ < ,bte- ,,"ntegerddress k N - O 0&44-9

tr5

  netddress "ddress < netddress.get/ddress,Kuads-9

return "ddress9

 6catch,G&ception e-5

  i#,D- Log.e,T:8?Cannot :et M 3)n ddress?-9

return null

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ServerThread$run( ) boolean socket3Q

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 Android Mani%est To be able to use the nternet ,open sockets- and to read our

o)n address ,#ro" the Fi4i Manager-; usesper"ission android;na"e