Android Bluetooth BroadcastReceiver 未发现设备

Question

我梳理了论坛以尝试找出为什么我的蓝牙 BroadcastReceiver 不工作，我所能找到的只是人们说要确保请求 coarse/fine 位置权限。我已经在这里做了（在发现方法之前调用方法）：

请求权限

private void requestPermissions()
{
    final int CODE = 5; // app defined constant used for onRequestPermissionsResult

    boolean allPermissionsGranted = true;

    String[] permissionsToRequest =
            {
                Manifest.permission.BLUETOOTH_ADMIN,
                Manifest.permission.BLUETOOTH,
                Manifest.permission.ACCESS_FINE_LOCATION,
                Manifest.permission.ACCESS_COARSE_LOCATION
            };

    for(String permission : permissionsToRequest)
    {
        allPermissionsGranted = allPermissionsGranted &&
                (ContextCompat.checkSelfPermission(this, permission)
                        == PackageManager.PERMISSION_GRANTED);
    }

    if(!allPermissionsGranted)
    {
        ActivityCompat.requestPermissions(this, permissionsToRequest, CODE);
    }
}

问题是我的 BroadcastReceiver 从未找到其他可发现的设备，如果设备已经配对，它会按预期将其放入 ListView 中，但是一旦设备取消配对，它就无法再次识别它。请参阅下面的屏幕截图。

Output with no paired devices

Output with paired devices

此时我不知所措，感觉我已经尝试了一切，如果有人有任何想法，你会拯救我的生命，我将永远感激不已。

谢谢，

广播接收器

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

        if(BluetoothDevice.ACTION_FOUND.equals(action))
        {
            BluetoothDevice btDevice = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);

            if(btDevice.getBondState() != BluetoothDevice.BOND_BONDED)
            {
                newDevicesArrayAdapter.add(btDevice.getName() + "\n" + btDevice.getAddress());
            }
        }
        else if(BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action))
        {
            setTitle(R.string.select_device);

            if(newDevicesArrayAdapter.getCount() == 0)
            {
                newDevicesArrayAdapter.clear();
                String noDevices = getResources().getText(R.string.none_found).toString();
                newDevicesArrayAdapter.add(noDevices);
            }
        }
    }
};

onCreate - 设置 ListView 元素和 IntentFilters

protected void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_choose_machine);

    setResult(Activity.RESULT_CANCELED);

    pairedDevicesArrayAdapter   = new ArrayAdapter<String>(this, R.layout.device_name);
    newDevicesArrayAdapter      = new ArrayAdapter<String>(this, R.layout.device_name);

    ListView pairedListView     = (ListView) findViewById(R.id.paired_devices);
    ListView newDevicesListView = (ListView) findViewById(R.id.new_devices);

    pairedListView.setAdapter(pairedDevicesArrayAdapter);
    pairedListView.setOnItemClickListener(deviceClickListener);
    newDevicesListView.setAdapter(pairedDevicesArrayAdapter);
    newDevicesListView.setOnItemClickListener(deviceClickListener);

    IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
    registerReceiver(broadcastReceiver, filter);

    filter              = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
    registerReceiver(broadcastReceiver, filter);
}

doDiscovery() - 由 onStart 方法调用，我已验证它已被调用

private void doDiscovery()
{
    Log.d(TAG, "doDiscovery()");

    requestPermissions();

    setTitle(R.string.scanning);

    findViewById(R.id.title_new_devices).setVisibility(View.VISIBLE);

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

    newDevicesArrayAdapter.clear();
    btAdapter.startDiscovery();
}

Answer 1

事实证明我只是愚蠢并且将值更新到两个 ListView，所以我从未看到其他设备的列表。

newDevicesListView.setAdapter(pairedDevicesArrayAdapter);

应该是：

newDevicesListView.setAdapter(newDevicesArrayAdapter);

Android Bluetooth BroadcastReceiver 未发现设备

Android Bluetooth BroadcastReceiver not discovering devices

android

bluetooth

android-bluetooth