Android startDiscovery不会启动

我有一段代码可以在大多数手机上使用，除了一部。这是一些发现蓝牙设备的代码

这是接收者的注册：

IntentFilter filter = new IntentFilter();
filter.addAction(BluetoothDevice.ACTION_FOUND);
filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_STARTED);
_ctx.registerReceiver(mReceiver, filter);

private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();

        // When discovery finds a device
        if (BluetoothAdapter.ACTION_DISCOVERY_STARTED.equals(action)) {
            Log.i(SapphireApplication.TAG, "Discovery started.");
        } else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) {
            Log.i(SapphireApplication.TAG, "Discovery finished.");
        }
    }
}

这是接收器：

IntentFilter filter = new IntentFilter();
filter.addAction(BluetoothDevice.ACTION_FOUND);
filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_STARTED);
_ctx.registerReceiver(mReceiver, filter);

private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();

        // When discovery finds a device
        if (BluetoothAdapter.ACTION_DISCOVERY_STARTED.equals(action)) {
            Log.i(SapphireApplication.TAG, "Discovery started.");
        } else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) {
            Log.i(SapphireApplication.TAG, "Discovery finished.");
        }
    }
}

以及我是如何开始探索的

if (theAdapter.isDiscovering()) {
    theAdapter.cancelDiscovery();
}

theAdapter.startDiscovery();

我有

android.permission.ACCESS\u rough\u LOCATION

和

android.permission.BLUETOOTH\u ADMIN

权限。在运行安卓11的Pixel 3上，该代码可以正常工作，但在装有安卓10的阿尔卡特5030D上，则不行。这就像发现从未启动一样（即，

Log.i

语句从未执行）

更新：我检查了返回值，它是

false

，但是

BluetoothAdapter.getState

返回12，它是

STATE\u ON

。哪种类型的人否认他说的话

我错过了什么