Createrfcommsockettoservicerecord's UUID problem and Bluetoothsocket's connect failure when connecting Bluetooth devices in Android

Problem

Toss:

"Record" writing Bluetooth module drivers and underlying Hart devices in Android

Period, refer to:

Bluetooth | Android developers–managingaconnection

Refer to "Connecting as a client" in:

TMP = Device.createrfcommsockettoservicerecord (MY_UUID);

Encounter a problem that the UUID does not understand.

Then go anywhere.

Http://www.guidgenerator.com/online-guid-generator.aspx

Get a UUID:

E214d9ae-c3ba-4e25-abb5-299041353bc3

The result runs to:

            try {                //Connect the device through the socket. This would block                //until it succeeds or throws an exception                mmsocket.connect ();            } catch (IOException ConnectEx ception) {                //Unable to connect, close the socket and get                out try {                    mmsocket.close ();                } catch (Ioexcepti On closeexception) {}                return;            }

In the following:

When you throw an exception.

That

Encounter Createrfcommsockettoservicerecord UUID do not understand, and Bluetoothsocket connect failed.

"Resolution Process"

1. Reference:

Android–why can ' t HTC Droid running OTA 2.1 communicate with RFCOMM? –stack Overflow

To try:

Method m = Device.getclass (). GetMethod ("Createrfcommsocket", new class[] {int.class}); mbtsocket = (Bluetoothsocket) M.invoke (device, 1);

The result is not very right to look at. I'm not going to try anymore.

2. Reference:

Need Bluetooth UUID Clarification–google Groups

To try:

00001101-0000-1000-8000-00805f9b34fb

The result is directly hung out.

3. Try again:

00000003-0000-1000-8000-00805f9b34fb

will also hang.

4. Then go to search:

Android Bluetooth Connect fail

Then go to reference:

Android Bluetooth can ' t connect–stack Overflow

And:

The Missing manual:android Bluetooth rfcomm«wires is Obsolete

To try, use the code:

Create a broadcastreceiver for action_found private final broadcastreceiver mreceiver = new Broadcastreceiver () {     P ublic void OnReceive (context context, Intent Intent) {//Bluetoothdevice Deviceextra = Intent.getparcelableextra (" Android.bluetooth.device.extra.DEVICE ");//parcelable[] Uuidextra = Intent.getparcelablearrayextra (" Android.bluetooth.device.extra.UUID ");         String action = Intent.getaction ();         When Discovery finds a device         if (BluetoothDevice.ACTION_FOUND.equals (ACTION)) {             //Get the Bluetoothdevice ob Ject from the Intent             bluetoothdevice Btdev = Intent.getparcelableextra (bluetoothdevice.extra_device);             parcelable[] Btdevuuid = Intent.getparcelablearrayextra (Bluetoothdevice.extra_uuid);

The btdevuuid that were debugged are null.

5. Swap:

         if (BluetoothDevice.ACTION_FOUND.equals (ACTION)) {             //Get The Bluetoothdevice object from the Intent             Bluetoothdevice Btdev = Intent.getparcelableextra (bluetoothdevice.extra_device);             parcelable[] Btdevuuid = Intent.getparcelablearrayextra (bluetoothdevice.extra_uuid);             UUID Btdevuuid = Intent.getparcelableextra (Bluetoothdevice.extra_uuid);

It's still not working.

6. Reference:

Issue 15919–android–bluetooth Connect fails under 2.3.3 for SPP devices using secure comms

Mentioned in the following:

Bluetoothdevice | Android Developers

In the prompt:

Hint:if connecting to a Bluetooth serial board then try using the well-known SPP UUID 00001101-0000-1000-8000-008 05F9B34FB. However if you is connecting to a Android peer then please generate your own unique UUID.

So try this UUID again:

00001101-0000-1000-8000-00805f9b34fb

In the end it is possible to:

The corresponding relevant code is:

 Private String Mactekhartmodemname;     Private UUID Mactekhartmodemuuid; void Afterfoundbthartmodem (Bluetoothdevice btdev, parcelable[] btdevuuid) {void Afterfoundbthartmodem ( Bluetoothdevice Btdev, UUID btdevuuid) {if (null! = Btdevuuid) {}//mactekhartmodemname = Btdev.getname ();    "Mactekviator75fe"//mactekhartmodemuuid = uuid.fromstring (mactekhartmodemname);  String Uuidvalue;    Http://www.guidgenerator.com/online-guid-generator.aspx//uuidvalue = "E214D9AE-C3BA-4E25-ABB5-299041353BC3"; Https://groups.google.com/forum/#!topic/android-developers/vyTEJOXELos//uuidvalue = "00001101-0000-100  0-8000-00805F9B34FB ";  Uuidvalue = "00000003-0000-1000-8000-00805F9B34FB";  Uuidvalue = "00001101-0000-1000-8000-00805F9B34FB";     Mactekhartmodemuuid = uuid.fromstring (Uuidvalue);     Connectthread connectbtthread = new Connectthread (Btdev); Connectbtthread.start (); } private class Connectthread extends Thread {private final bluetoothsocket mmsocket;        Private final Bluetoothdevice Mmdevice;            Public Connectthread (Bluetoothdevice device) {//Use a temporary object that's later assigned to Mmsocket,            Because Mmsocket is final bluetoothsocket tmp = NULL;                 Mmdevice = device;  Get a bluetoothsocket to connect with the given Bluetoothdevice try {//My_uuid is the app ' s UUID string, also used by the server code TMP = Device.createrfcommsockettoservicerecord (mactekhartmodemuu        ID);//00001101-0000-1000-8000-00805F9B34FB} catch (IOException e) {} mmsocket = tmp; } public void Run () {//Cancel discovery because it would slow down the connection Mblue                 Toothadapter.canceldiscovery (); try {//Connect the device through the socket. This would block//until it succeeds or throws an exception Mmsocket.conNect ();                } catch (IOException connectexception) {//Unable to connect; Close the socket and get out                try {mmsocket.close ();            } catch (IOException closeexception) {} return;        }//Do work to manage the connection (in a separate thread) Manageconnectedsocket (Mmsocket);            }/** would cancel an in-progress connection, and close the socket */public void Cancel () {            try {mmsocket.close (); } catch (IOException e) {}}}

Summary

Here, you must use the UUID of the Android SSP (protocol stack default):

00001101-0000-1000-8000-00805f9b34fb

To normal and external, but also the SSP serial port Bluetooth device to connect.

Createrfcommsockettoservicerecord's UUID problem and Bluetoothsocket's connect failure when connecting Bluetooth devices in Android