Android蓝牙聊天示例无法工作，无法连接设备

<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />

BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (bluetoothAdapter == null || !bluetoothAdapter.isEnabled()) {
    // 蓝牙未启用，需要请求用户授权启用蓝牙
    Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
    startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
}

Intent discoverableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
discoverableIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 300); // 设置可见时间为300秒
startActivity(discoverableIntent);

BluetoothDevice device = bluetoothAdapter.getRemoteDevice(deviceAddress);
BluetoothSocket socket = device.createRfcommSocketToServiceRecord(uuid);
socket.connect();