如何在Java中刷新蓝牙设备列表

Question

我正在尝试制作一个有关本地化的android应用程序，但是我试图在列表中列出我的智能手机发现的蓝牙设备，并每10秒刷新一次列出信息。 之所以要这样做，是因为我还要记录信号强度（RSSI），并且要记录信标在移动时超出范围或信号变得较弱时。 因此，刷新列表将对此有所帮助。 我在下面提供了一些代码。

@Override protected void onResume() {
    super.onResume();
    registerReceiver(devicesFoundReceiver, new IntentFilter(BluetoothDevice.ACTION_FOUND));
        registerReceiver(devicesFoundReceiver, new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_STARTED));
        registerReceiver(devicesFoundReceiver, new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED));
    }

    private final BroadcastReceiver devicesFoundReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            if (BluetoothDevice.ACTION_FOUND.equals(action)){
                BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                int rssid = intent.getShortExtra(BluetoothDevice.EXTRA_RSSI, Short.MIN_VALUE);
                listAdapter.add(device.getName() + "\n" + device.getAddress() + "\n" + " RSSI: " + rssid + "dBm");
                listAdapter.notifyDataSetChanged();
            }else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)){
                scanningButton.setText("Scan Bluetooth Devices");
            }else if (BluetoothAdapter.ACTION_DISCOVERY_STARTED.equals(action)){
                scanningButton.setText("Scanning in progress ...");
            }
        }
    };

Answer 1

使用列表视图，然后在Adapter对象上调用notifyDataSetChanged()