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问题：当蓝牙设备正在配对或配对时，我会收到通知。但是，我不知道如何在设备未配对时收到通知。我怎样才能让我的应用程序在它与我的设备未配对时识别出来？

示例：假设我通过代码将 Surface 平板电脑和我的 android 手机配对。我的广播接收器将注册ACTION_BOND_STATE_CHANGED意图并允许我根据需要处理它。现在，如果我想取消配对我的 Surface 平板电脑，我的手机不会收到有关设备已取消配对的通知。如果我检查device.getBondState()未配对后的设备，它等于BOND_BONDED（显然不是）我可以让它在我尝试连接到未配对的设备后再次识别它未配对，然后应用程序崩溃然后当我转身时再次打开该应用程序，然后它才会将其识别为未配对。

场景：我BroadcastReceiver注册了一个监听蓝牙设备引起的意图

getActivity().registerReceiver(broadcastReceiver, new IntentFilter(BluetoothDevice.ACTION_FOUND));
getActivity().registerReceiver(broadcastReceiver, new IntentFilter(BluetoothDevice.ACTION_BOND_STATE_CHANGED));
getActivity().registerReceiver(broadcastReceiver, new IntentFilter(BluetoothDevice.ACTION_ACL_DISCONNECT_REQUESTED));
getActivity().registerReceiver(broadcastReceiver, new IntentFilter(BluetoothDevice.ACTION_ACL_DISCONNECTED));

我用这个处理这些动作BroadcastReciever：

final BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        System.out.println("ACTION: "+ action);
        // When discovery finds a device

    if (BluetoothDevice.ACTION_FOUND.equals(action)) {
        list();

        // Get the BluetoothDevice object from the intent
        BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
        System.out.println("FOUND: " + device.getName() + " STATE: " + device.getBondState());
        mapInput(device);

        // Add the name and the mac address of the object to the array adapter
        BTSimpleAdapter.notifyDataSetChanged();
    } else if (BluetoothDevice.ACTION_BOND_STATE_CHANGED.equals(action)) {
        BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
        System.out.println("UPDATE Name " + device.getName() + " Value " + device.getAddress() + " Bond state " + device.getBondState());
        for (Map<String, String> entry : data) {
            if (entry.get("Name").equals(device.getName()) && entry.get("Value").equals(device.getAddress())) {
                if (device.getBondState() == BluetoothDevice.BOND_NONE) {
                    entry.put("Paired", "Unpaired");
                } else if (device.getBondState() == BluetoothDevice.BOND_BONDING) {
                    entry.put("Paired", "Pairing");
                } else {
                    entry.put("Paired", "Paired");
                }
                BTSimpleAdapter.notifyDataSetChanged();
            }
        }
    }
}
};
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