java - Android bluetooth connection doesn't close after application crash

Question

i'm using SPP profile for connect to my device:

    Set<BluetoothDevice> devices = ba.getBondedDevices();
    for(BluetoothDevice bd : devices)
    {
        String name = bd.getName();
        if(name.equals("CELLMETER"))
        {
            try
            {
                BluetoothSocket bs = bd.createRfcommSocketToServiceRecord(UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"));
                bs.connect();
            } catch (IOException e)
            {
                e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
            }
        }
    }

All seems okay, i created function where i'm closing input output buffers and close socket. But when application crashes or i'm stopping application when breakpoints arrives socket doesn't closes, even after i kill process manually and it's not avalible for new connection from new instance of app.

What i'm doing wrong? For each crash/debug operation i have to reboot phone :(

It's manifested only to Android 2.3.5 (Samsung 5830i) and on Android 4.0.4 (Freelander P10). On my Android 4.2.1 (Galaxy Nexus) all okay, after app crash connection closes automatically. (it seems because there is new Bluetooth stack)

Answer 1

I can see 2 options to work that out: 1- Add an UncaughtExceptionHandler in your app, best in Application-derived class:

        mUEHandler = new Thread.UncaughtExceptionHandler()
        {
            @Override
            public void uncaughtException(Thread t, Throwable e)
            {
                // Close any opened sockets here

                defaultUEH.uncaughtException(t, e);
            }
        };

        Thread.setDefaultUncaughtExceptionHandler(mUEHandler);

But that only takes care of app crashes. If user kills the app, won't get in there at all.

2- Store some socket identification that allow you to close it when app restarts.

It's not perfect, but that could work-around your issue.