CompanionDeviceManager 'onDeviceFound' 回调函数未被调用

Question

我们正在尝试使用 CompanionDeviceManager 类将我们的 BLE 设备与我们的 Android（版本 10）手机配对，而无需位置权限。

出于测试目的，我们在测试设备周围激活了多部手机和蓝牙设备的蓝牙。

我们正在使用来自official site 的示例代码，但没有成功。

将这些代码添加到 AndroidManifest 文件中：

<uses-feature android:name="android.hardware.bluetooth"/>
<uses-feature android:name="android.software.companion_device_setup"/>
<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />

MainActivity 完整代码：

public class MainActivity extends AppCompatActivity {


    private CompanionDeviceManager deviceManager;
    private AssociationRequest pairingRequest;
    private BluetoothDeviceFilter deviceFilter;

    private static final int SELECT_DEVICE_REQUEST_CODE = 42;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Log.e("ArkSigner", "onCreate called.");

        deviceManager = getSystemService(CompanionDeviceManager.class);

        // To skip filtering based on name and supported feature flags (UUIDs),
        // don't include calls to setNamePattern() and addServiceUuid(),
        // respectively. This example uses Bluetooth.
        deviceFilter = new BluetoothDeviceFilter.Builder()
                //.setNamePattern(Pattern.compile("Test"))
                //.addServiceUuid(new ParcelUuid(new UUID(0x123abcL, -1L)), null)
                .build();

        // The argument provided in setSingleDevice() determines whether a single
        // device name or a list of device names is presented to the user as
        // pairing options.
        pairingRequest = new AssociationRequest.Builder()
                .addDeviceFilter(deviceFilter)
                //.setSingleDevice(true)
                .build();

        List<String> associations = deviceManager.getAssociations();

        // When the app tries to pair with the Bluetooth device, show the
        // appropriate pairing request dialog to the user.
        deviceManager.associate(pairingRequest,
                new CompanionDeviceManager.Callback() {
                    @Override
                    public void onDeviceFound(IntentSender chooserLauncher) {
                        try {

                            Log.e("ArkSigner", "onDeviceFound called.");

                            startIntentSenderForResult(chooserLauncher,
                                    SELECT_DEVICE_REQUEST_CODE, null, 0, 0, 0);
                        } catch (IntentSender.SendIntentException e) {
                            e.printStackTrace();
                        }
                    }

                    @Override
                    public void onFailure(CharSequence error) {
                        Log.e("ArkSigner", "onFailure called.");
                    }
                },
                null);


    }


    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {

        super.onActivityResult(requestCode, resultCode, data);
        
        Log.e("ArkSigner", "onActivityResult called.");

        if (requestCode == SELECT_DEVICE_REQUEST_CODE &&
                resultCode == Activity.RESULT_OK) {
            // User has chosen to pair with the Bluetooth device.
            BluetoothDevice deviceToPair =
                    data.getParcelableExtra(CompanionDeviceManager.EXTRA_DEVICE);
            deviceToPair.createBond();

            // ... Continue interacting with the paired device.
        }
    }
}

在我们运行我们的 Android 应用程序后，我们没有看到任何关于找到的设备的对话框。（蓝牙或 BLE 设备）

编辑：如果我们在 ".setNamePattern(Pattern.compile("Test"))" 行中提供设备名称或使用 ".setSingleDevice(true)" 它不会改变任何东西。

Answer 1

您应该改用BluetoothLeDeviceFilter，因为根据https://developer.android.com/reference/android/companion/BluetoothDeviceFilter 的文档，BluetoothDeviceFilter 用于非 BLE 设备。

对于 BLE 设备，还期望 parcelable extra 包含 android.bluetooth.le.ScanResult 而不是 BluetoothDevice。

Answer 2

我在 Android 11 中遇到了同样的问题。当我评论“.addDeviceFilter(deviceFilter)”部分时，CompanionDeviceManager 显示 Wi-Fi 网络没有问题。所以，问题只出在蓝牙设备上。

为了解决这个问题，我刚刚启用了“位置”，并且 CompanionDeviceManager 按预期显示了蓝牙设备。

也在清单中添加此权限：

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

参考：https://developer.android.com/guide/topics/connectivity/bluetooth

“在 Android 10 及更高版本上运行的服务无法发现蓝牙设备，除非它们具有 ACCESS_BACKGROUND_LOCATION 权限”