Android Bluetooth communication.

Here we useRFCOMM is a simple serial linear simulation protocol that provides RS232 control and status signals.

That is, a serial port (COM) transmission protocol with a baud rate of BITs and 8 bits. Therefore, mobile phone Bluetooth can communicate with other Bluetooth devices.

Two devices need to establish a server and a server to communicate with each other. After the client connects to the server, it can send and receive data.

Source code: Http://download.csdn.net/detail/menghnhhuan/3901081

 

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2. /* Some constants, representing the name of the server */
4. Public static final stringProtocol_scheme_l2cap="Btl2cap";
6. Public static final stringProtocol_scheme_rfcomm="Btspp";
8. Public static final stringProtocol_scheme_bt_obex="Btgoep";
10. Public static final stringProtocol_scheme_tcp_obex="Tcpobex";
14. Private ipvthserversocketMserversocket=Null;
16. Private serverthreadStartserverthread=Null; // Enable the service thread
18. Private clientthreadClientconnectthread=Null; // Client connection thread
20. Private ipvthsocketSocket=Null;
22. Private delethdeviceDevice=Null;
24. Private readthreadMreadthread=Null; // Read data thread
26. Private descrithadapterMblustmthadapter=Descrithadapter. Getdefaadapter adapter (); // Bluetooth adapter

/* Some constants, representing the server name */public static final string protocol_scheme_l2cap = "btl2cap"; public static final string protocol_scheme_rfcomm = "btspp "; public static final string protocol_scheme_bt_obex = "btgoep"; public static final string protocol_scheme_tcp_obex = "tcpobex"; private javasthserversocket mserversocket = NULL; private serverthread startserverthread = NULL; // enable the service thread private clientthread clientconnectthread = NULL; // The client connection thread private javasthsocket socket = NULL; private javasthdevice device = NULL; private readthread mreadthread = NULL; // read the data thread private javasthadapter mblustmthadapter = descrithadapter. getdefaadapter adapter (); // Bluetooth adapter
 

 

Enable ServerCode

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1. Startserverthread=NewServerthread ();
2. Startserverthread. Start ();

 
Startserverthread = new serverthread (); startserverthread. Start ();
 

Enable Client

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1. Device=Mblustmthadapter. Getremotedevice (Address );
2. Clientconnectthread=NewClientthread ();
3. Clientconnectthread. Start ();

 
Device = mblustmthadapter. getremotedevice (Address); clientconnectthread = new clientthread (); clientconnectthread. Start ();
 

Server code

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2. // Enable the server
4. Private class serverthread extends thread {
6. Public void run (){
8. Try {
10. /* Create a Bluetooth server
12. * Parameters: Server Name and UUID */
14. Mserversocket=Mblustmthadapter. Listenusingrfcommwithservicerecord (protocol_scheme_rfcomm,
16. UUID. fromstring ("20171101-0000-1000-8000-00805f9b34fb "));
18. Log. D ("server", "Wait cilent connect ...");
22. /* Accept client connection requests */
24. Socket=Mserversocket. Accept ();
26. Log. D ("server", "accept success! ");
30. // Start receiving data
32. Mreadthread=NewReadthread ();
34. Mreadthread. Start ();
36. } Catch (ioexception e ){
38. // Todo auto-generated Catch Block
40. E. printstacktrace ();
42. }
44. }
46. };

// Enable server private class serverthread extends thread {public void run () {try {/* to create a Bluetooth server * parameters: Server Name, UUID */mserversocket = mbluw.thadapter. listenusingrfcommwithservicerecord (protocol_scheme_rfcomm, UUID. fromstring ("20171101-0000-1000-8000-00805f9b34fb"); log. D ("server", "Wait cilent connect... ");/* accept client connection requests */socket = mserversocket. accept (); log. D ("server", "accept success! "); // Start receiving data mreadthread = new readthread (); mreadthread. start ();} catch (ioexception e) {// todo auto-generated catch blocke. printstacktrace ();}}};
 

Client code:

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2. // Enable the client
4. Private class clientthread extends thread {
6. Public void run (){
8. Try {
10. // Create a socket connection: only the uuid of the server at registration is required.
12. //Socket=Device. Createrfcommsockettoservicerecord (export thprotocols. obex_object_push_protocol_uuid );
14. Socket=Device. Createrfcommsockettoservicerecord (UUID. fromstring ("20171101-0000-1000-8000-00805f9b34fb "));
16. // Connection
18. Socket. Connect ();
20. // Start receiving data
22. Mreadthread=NewReadthread ();
24. Mreadthread. Start ();
26. }
28. Catch (ioexception E)
30. {
32. Log. E ("Connect", "", e );
34. MessageMSG=NewMessage ();
36. MSG. OBJ="An error occurred while connecting to the server! Disconnect and try again. ";
38. MSG. What=0;
40. Linkdetectedhandler. sendmessage (MSG );
42. }
44. }
46. };

 
// Enable Client Private class clientthread extends thread {public void run () {try {// create a socket connection: only the uuid ID of the server at registration/socket = device. createrfcommsockettoservicerecord (fig. obex_object_push_protocol_uuid); socket = device. createrfcommsockettoservicerecord (UUID. fromstring ("20171101-0000-1000-8000-00805f9b34fb"); // connect to the socket. connect (); // start receiving data mreadthread = new readthread (); mreadthread. start ();} Ca Tch (ioexception e) {log. E ("Connect", "", e); message MSG = new message (); msg. OBJ = "An error occurred while connecting to the server! Disconnect and try again. "; MSG. What = 0; linkdetectedhandler. sendmessage (MSG );}}};
 

Code for sending and receiving data

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2. // Send data
4. Private void sendmessagehandle (string MSG)
6. {
8. If (Socket= NULL)
10. {
12. Toast. maketext (mcontext, "No connection", Toast. length_short). Show ();
14. Return;
16. }
18. Try {
20. OutputstreamOS=Socket. Getoutputstream ();
22. OS. Write (msg. getbytes ());
24. } Catch (ioexception e ){
26. // Todo auto-generated Catch Block
28. E. printstacktrace ();
30. }
32. }
34. // Read data
36. Private class readthread extends thread {
38. Public void run (){
42. Byte []Buffer=NewByte [2, 1024];
44. Int bytes;
46. InputstreamMminstream=Null;
50. Try {
52. Mminstream=Socket. Getinputstream ();
54. } Catch (ioexception E1 ){
56. // Todo auto-generated Catch Block
58. E1.printstacktrace ();
60. }
62. While (true ){
64. Try {
66. // Read from the inputstream
68. If ((Bytes=Mminstream. Read (buffer ))>0)
70. {
72. Byte []Buf_data=NewByte [bytes];
74. For (intI=0; I<Bytes; I ++)
76. {
78. Buf_data [I] = buffer [I];
80. }
82. StringS=NewString (buf_data );
84. MessageMSG=NewMessage ();
86. MSG. OBJ=S;
88. MSG. What=1;
90. Linkdetectedhandler. sendmessage (MSG );
92. }
94. } Catch (ioexception e ){
96. Try {
98. Mminstream. Close ();
100. } Catch (ioexception E1 ){
102. // Todo auto-generated Catch Block
104. E1.printstacktrace ();
106. }
108. Break;
110. }
112. }
114. }
116. }

 

Source: http://blog.csdn.net/menghnhhuan/article/details/7057484