Android蓝牙:配对设备列表

Question

我有一个带SPP配置文件和蓝牙版本2.1的蓝牙设备.
我有一个连接到该设备并与之通信的应用程序.该设备使用"Just Works"配对技术.

我在某些手机上遇到问题,如三星Galaxy平板电脑,Galaxy S.

问题是在用户退出应用程序后,我正在关闭套接字并断开与设备的连接.成功断开连接后,会发现设备的条目已从配对设备列表中删除.

Answer 1

我没有使用平板电脑,但我确实编写了一个使用SPP for Android手机的应用程序.我发现,为了使蓝牙稳定,我必须手动绑定我想要与之通信的设备.我们使用下面的代码从应用程序中启动绑定,它应该保留绑定,就像您通过设置菜单手动配对一样.

以下是一般流程:1)注册BroadcastReceiver以侦听BluetoothDevice.ACTION_BOND_STATE_CHANGED
2)设备发现后,您应该有一个BluetoothDevice对象.
3)使用反射在BluetoothDeviceObject上调用'createBond'方法
3a)在打开套接字之前等待绑定状态更改事件

BluetoothDevice device = {obtained from device discovery};
Method m = device.getClass().getMethod("createBond", (Class[])null);
m.invoke(device, (Object[])null);

int bondState = device.getBondState();
if (bondState == BluetoothDevice.BOND_NONE || bondState == BluetoothDevice.BOND_BONDING)
{
    waitingForBonding = true; // Class variable used later in the broadcast receiver

    // Also...I have the whole bluetooth session running on a thread.  This was a key point for me.  If the bond state is not BOND_BONDED, I wait here.  Then see the snippets below
    synchronized(this)
    {
        wait();
    }
}

4)等待债券状态从BOND_BONDING变为BOND_BONDED

在BroadcastReciever中:

public void onReceive(Context context, Intent intent)
{
    if (BluetoothDevice.ACTION_BOND_STATE_CHANGED.equals(intent.getAction()))
    {
        int prevBondState = intent.getIntExtra(BluetoothDevice.EXTRA_PREVIOUS_BOND_STATE, -1);
        int bondState = intent.getIntExtra(BluetoothDevice.EXTRA_BOND_STATE, -1);

        if (waitingForBonding)
        {
            if (prevBondState == BluetoothDevice.BOND_BONDING)
            {
                // check for both BONDED and NONE here because in some error cases the bonding fails and we need to fail gracefully.
                if (bondState == BluetoothDevice.BOND_BONDED || bondState == BluetoothDevice.BOND_NONE)
                {
                    // safely notify your thread to continue
                }
            }
        }
    }
}

5)打开插座并进行通信

你也可以通过反射'removeBond'方法从配对列表中删除你的设备.

希望这可以帮助!