How to prevent Android bluetooth RFCOMM connection from dying immediately after .connect()?

Answer 1

If I understand correctly, your app is unable to see any data from the device whatsoever?

One small thing: try your UUID without hiphens. In my RFCOMM apps I actually define the UUID as a long integer constant.

Also, the way your test() method is written leads me to believe the test() is making the connection, defining a thread, telling it to start and immediately returning. In other words, your thread is referencing a variable from outside of the thread which is part of the test() method but when test() dies, so does its variables.

In short, try your testing outside of a thread and get it working there first. One easy way to do this would be to use Thread.run() instead of thread.start(). .run() runs it in the foreground (and thus blocks test() so it doesn't return before the thread finished).

For a longer term solution you may wish to define your Bluetooth variables as gloibal/member variables so they don't go out of scope and are always available to your thread.

Answer 2

Try the well known UUID:00001101-0000-1000-8000-00805F9B34FB

Answer 3

Try to change your code for creating RfcommSocket:

sock = zee.createRfcommSocketToServiceRecord(
                      UUID.fromString("8e1f0cf7-508f-4875-b62c-fbb67fd34812"));

for this code:

Method m = zee.getClass().getMethod("createRfcommSocket", new Class[] { int.class });
sock = (BluetoothSocket) m.invoke(device, 1);

Also try to change argument value in range 1-3 in this m.invoke(device, 1); When connection will be Connected, but aborted when you try reading, call in some loop your method test() again. As simple:

for(int i=0;i<3;i++){  if(!testDone) test(); }

Answer 4

Thank you! I never would've figured this out.

Answer 5

hi !! could you please post your hole application (link)... i just started developing with android and i have to develope an application able to send file with bluetooth... i don't know haw to statr..

thanks

Answer 6

Huge question I have downloaded the android market place app designed for the zeemote, followed the instructions and takes all the way through until it says connect with zeemote JS1 then immediately displays failure to connect recheck the the bluetooth I double check bluetooth is on and nothing! soo lost please help the guys who provided the app are just as lost and continue to say it will not work with HTC sense UI, if this code is the trick how do I use it on my HTC Hero?