Android Bluetooth SPP protocol communication

Source: Internet
Author: User

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1. Bluetooth serial port based on SPP protocol (Serial Port profile), can create serial port between Bluetooth devices for data transmission
2.SPP of UUID:00001101-0000-1000-8000-00805F9B34FB
3.Android mobile phones Generally actively connect the SPP protocol device to the client's role

Connection process

1. Detecting Bluetooth status
If Bluetooth is not turned on, turn on Bluetooth ~

Bluetoothadapter =Bluetoothadapter.getdefaultadapter (); @Overrideprotected voidOnresume () {Super. Onresume (); if(!bluetoothadapter.isenabled ()) {        //Open BlueToothIntent enablebtintent =NewIntent (bluetoothadapter.action_request_enable);    Startactivityforresult (Enablebtintent, REQUEST_ENABLE_BT); }} @Overrideprotected voidOnactivityresult (intRequestcode,intResultCode, Intent data) {    if(Requestcode = = Request_enable_bt && ResultCode = =activity.result_canceled)        {Finish (); return; }}

2. Registering devices to search for broadcast information
Use Registerreceiver to register broadcastreceiver for messages such as search devices

Intentfilter Intentfilter =NewIntentfilter (); intentfilter.addaction (Bluetoothdevice.action_found); Intentfilter.addaction ( bluetoothadapter.action_discovery_finished); Registerreceiver (receiver, intentfilter);//receiverPrivate FinalBroadcastreceiver receiver =NewBroadcastreceiver () {@Override Public voidOnReceive (Context context, Intent Intent) {String action=intent.getaction (); if(BluetoothDevice.ACTION_FOUND.equals (ACTION)) {//Find a DeviceBluetoothdevice device =intent. Getparcelableextra (Bluetoothdevice.extra_device); if(Device.getbondstate ()! =bluetoothdevice.bond_bonded) {                //Device not pairedNewdevicearrayadapter.add (Device.getname () + "\ n" +device.getaddress ()); }Else {                //devices that have been pairedTextView tvpaired =(TextView) Findviewbyid (r.id.tv_paired);                Tvpaired.setvisibility (view.visible);                Lvpaireddevices.setvisibility (view.visible); Paireddevicearrayadapter.add (Device.getname ()+ "\ n" +device.getaddress ()); } log.i (TAG,"Name:" + device.getname () + "address" +device.getaddress ()); } Else if(BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals (ACTION) {//Search FinishLOG.I (TAG, "Search finish!"); }    }};

3. Using Blueadatper Search
Using the Bluetoothadapter search device, Bluetoothadapter.startdiscovery () will issue three broadcast messages during the search process:
Action_discovery_start: Start Search
Action_discovery_finished: End of search
Action_found: Find the device

@Override  Public void OnClick (View v) {    if  (bluetoothadapter.isdiscovering ()) {        Bluetoothadapter.canceldiscovery ();    }    Bluetoothadapter.startdiscovery ();}

4. Get the Bluetooth device information you have searched for
Get Bluetooth device information (such as name, Mac,rssi) found in Broadcastreceiver's OnReceive ()
5. Create a Bluetoothdevice object with the MAC address of the Bluetooth device:

Bluetoothdevice Romotedevice = Bluetoothadapter.getremotedevice (mdeviceaddress);

6. Derived from Bluetoothdevice Bluetoothsocket
Use the Bluetoothsocket Createrfcommsockettoservicerecord () method to select the Protocol/service for the connection, using SPP (uuid:0 0001101-0000-1000-8000-00805F9B34FB)

Try {    =catch  (IOException e) {    e.printstacktrace ();    Toast.maketext (This, "Socket init failed", Toast.length_short). Show ();

7. Use Bluetoothsocket to connect and read and write Bluetooth devices
Read and write can be attributed to a separate thread to implement ~

Try{bluetoothsocket.connect (); Toast.maketext ( This, "Connect Success", Toast.length_short). Show ();} Catch(IOException E2) {e2.printstacktrace (); Toast.maketext ( This, "Connect Failed", Toast.length_short). Show (); Try{bluetoothsocket.close (); Bluetoothsocket=NULL; } Catch(IOException e) {e.printstacktrace (); Toast.maketext ( This, "Socket close failed", Toast.length_short). Show (); }    return;}Try{InputStream=Bluetoothsocket.getinputstream ();} Catch(IOException E2) {e2.printstacktrace (); Toast.maketext ( This, "Get InputStream Failed", Toast.length_short). Show (); return;}Try{outputstream OS=Bluetoothsocket.getoutputstream (); byte[] Osbytes =Etinput.gettext (). toString (). GetBytes ();  for(inti = 0; i < osbytes.length; i++) {        if(Osbytes[i] = = 0x0a) n++; }    byte[] Osbytesnew =New byte[osbytes.length+N]; N= 0;  for(inti = 0; i < osbytesnew.length; i++) {        //mobile "\ n" is 0a,modify 0d 0a then send        if(Osbytesnew[i] = = 0x0a) {Osbytesnew[n]= 0x0d; N++; Osbytesnew[n]= 0x0a; }Else{Osbytesnew[n]=Osbytes[i]; } N++; } os.write (osbytesnew);} Catch(Exception e) {e.printstacktrace ();}

Android Bluetooth SPP protocol communication

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