BluetoothAdapter.startDiscovery() 没有发现那些屏幕关闭的蓝牙设备（在我的例子中是智能手机）

Question

我一直在尝试使用 bluetoothAdapter 的 startDiscovery() 函数发现所有相邻的蓝牙设备（在我的例子中是经典蓝牙）。但问题是，只发现那些在设置中打开蓝牙屏幕的设备，或者换句话说，所有关闭屏幕的智能手机都没有被发现。我想发现每一个蓝牙打开的相邻设备。以下是我用于完成上述工作的代码片段：

//Broadcast Receiver for getting bluetooth devices
    BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            if (BluetoothDevice.ACTION_FOUND.equals(action)){
                BluetoothDevice bluetoothDevice = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                System.out.println("A device was found!"+bluetoothDevice.getName());
            }
        }
    };

//Registering the broadcast receiver
    protected void onStart() {
        super.onStart();
        IntentFilter intentFilter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
        registerReceiver(broadcastReceiver, intentFilter);

    }

//Calling the startDiscovery() function of the bluetoothAdapter
    public void discoverDevices(View v){
        bluetoothAdapter.startDiscovery();
        System.out.println("Bluetooth Discovery has started");
    }

我已经搜索了很多地方来获得这个但没有成功，任何线索都将非常有帮助。

Answer 1

Android developers API reference 明确说明如下：

Device discovery will only find remote devices that are currently discoverable (inquiry scan enabled). Many Bluetooth devices are not discoverable by default, and need to be entered into a special mode.

您可能不得不接受您尝试做的事情行不通的想法。

BluetoothAdapter.startDiscovery() 没有发现那些屏幕关闭的蓝牙设备（在我的例子中是智能手机）

BluetoothAdapter.startDiscovery() doesn't discovers those bluetooth devices(Smart Phones in my case) whose screen is off

android

bluetooth