无法发现BLE设备

Question

我有一个BLE设备。 设备有一个按钮。 目标是在按下设备按钮时触发android设备中的某些操作。

我的问题是，我能够通过系统蓝牙扫描器发现并与BLE设备配对。 但是当我使用BLE扫描内部代码（与Google代码相同）时，我看不到设备。

我的清单中有我的关注标签。

uses-permission android:name="android.permission.BLUETOOTH"

uses-permission android:name="android.permission.BLUETOOTH_ADMIN"

这是我的gradle设置

minSdkVersion 18, targetSdkVersion 22

Phone- Nexus 5 | Android M

这是日志。 如您所看到的粗体字所示，它会发现设备，但不会添加它。 知道为什么会这样吗？

BtGatt.GattService﹕ registerClient() - UUID=b7516aaa-22b1-4d8f-a71e-405e5584edcf BtGatt.GattService﹕ onClientRegistered() - UUID=b7516aaa-22b1-4d8f-a71e-405e5584edcf, clientIf=5

BtGatt.GattService﹕ start scan with filters

BtGatt.ScanManager﹕ handling starting scan

BtGatt.ScanManager﹕ configureRegularScanParams() - queue=1

BtGatt.ScanManager﹕ configureRegularScanParams() - ScanSetting Scan mode=2 mLastConfiguredScanSetting=-2147483648

BtGatt.ScanManager﹕ configureRegularScanParams - scanInterval = 8000configureRegularScanParams - scanWindow = 8000

BtGatt.GattService﹕ onScanParamSetupCompleted : 0

bt_btif_gattc﹕ btif_gattc_update_properties BLE device name=Security Tag len=12 dev_type=2 bt_btif_gattc﹕ btif_gattc_update_properties BLE device name=BlueFind len=15 dev_type=2

BtGatt.GattService﹕ stopScan() - queue size =1

BtGatt.ScanManager﹕ stop scan

BtGatt.ScanManager﹕ configureRegularScanParams() - queue=0

BtGatt.ScanManager﹕ configureRegularScanParams() - ScanSetting Scan mode=-2147483648 mLastConfiguredScanSetting=2

BtGatt.ScanManager﹕ configureRegularScanParams() - queue emtpy, scan stopped

BtGatt.GattService﹕ unregisterClient() - clientIf=5

BtGatt.GattService﹕ registerClient() -
**UUID=2f2450e9-ea7a-4dfe-aef2-27bcd75c83c5**

BtGatt.GattService﹕ onClientRegistered() - UUID=2f2450e9-ea7a-4dfe-aef2-27bcd75c83c5, clientIf=5

BtGatt.GattService﹕ start scan with filters

BtGatt.ScanManager﹕ handling starting scan BtGatt.ScanManager﹕ configureRegularScanParams() - queue=1

BtGatt.ScanManager﹕ configureRegularScanParams() - ScanSetting Scan mode=2 mLastConfiguredScanSetting=-2147483648

BtGatt.ScanManager﹕ configureRegularScanParams - scanInterval = 8000configureRegularScanParams - scanWindow = 8000

BtGatt.GattService﹕ onScanParamSetupCompleted : 0

**bt_btif_gattc﹕ btif_gattc_update_properties BLE device name=Security Tag len=12 dev_type=2**
**bt_btif_gattc﹕ btif_gattc_update_properties BLE device name=BlueFind len=15 dev_type=2**

BtGatt.GattService﹕ stopScan() - queue size =1

BtGatt.ScanManager﹕ stop scan

BtGatt.ScanManager﹕ configureRegularScanParams() - queue=0

BtGatt.ScanManager﹕ configureRegularScanParams() - ScanSetting Scan mode=-2147483648 mLastConfiguredScanSetting=2

BtGatt.ScanManager﹕ configureRegularScanParams() - queue emtpy, scan stopped

BtGatt.GattService﹕ unregisterClient() - clientIf=5

--EDIT1--

这是我的代码片段

   private void scanLeDevice(final boolean enable) {
    if (enable) {
        // Stops scanning after a pre-defined scan period.
        mHandler.postDelayed(new Runnable() {
            @Override
            public void run() {
                mScanning = false;
                mBluetoothAdapter.stopLeScan(mLeScanCallback);
                invalidateOptionsMenu();
            }
        }, SCAN_PERIOD);
        mScanning = true;
        mBluetoothAdapter.startLeScan(mLeScanCallback);
    } else {
        mScanning = false;
        mBluetoothAdapter.stopLeScan(mLeScanCallback);
    }
    invalidateOptionsMenu();
}

// Adapter for holding devices found through scanning.
private class LeDeviceListAdapter extends BaseAdapter {
    private ArrayList<BluetoothDevice> mLeDevices;
    private LayoutInflater mInflator;

    public LeDeviceListAdapter() {
        super();
        mLeDevices = new ArrayList<BluetoothDevice>();
        mInflator = BLEScanActivity.this.getLayoutInflater();
    }

    public void addDevice(BluetoothDevice device) {
        if(!mLeDevices.contains(device)) {
            mLeDevices.add(device);
        }
    }

    public BluetoothDevice getDevice(int position) {
        return mLeDevices.get(position);
    }

    public void clear() {
        mLeDevices.clear();
    }

    @Override
    public int getCount() {
        return mLeDevices.size();
    }

    @Override
    public Object getItem(int i) {
        return mLeDevices.get(i);
    }

    @Override
    public long getItemId(int i) {
        return i;
    }

    @Override
    public View getView(int i, View view, ViewGroup viewGroup) {
        ViewHolder viewHolder;
        // General ListView optimization code.
        if (view == null) {
            view = mInflator.inflate(R.layout.listitem_device, null);
            viewHolder = new ViewHolder();
            viewHolder.deviceAddress = (TextView) view.findViewById(R.id.device_address);
            viewHolder.deviceName = (TextView) view.findViewById(R.id.device_name);
            view.setTag(viewHolder);
        } else {
            viewHolder = (ViewHolder) view.getTag();
        }

        final BluetoothDevice  device = mLeDevices.get(i);
        final String deviceName = device.getName();
        if (deviceName != null && deviceName.length() > 0)
            viewHolder.deviceName.setText(deviceName);
        else
            viewHolder.deviceName.setText(R.string.unknown_device);
        viewHolder.deviceAddress.setText(device.getAddress());
        return view;
    }
}

// Device scan callback.
private BluetoothAdapter.LeScanCallback mLeScanCallback =
        new BluetoothAdapter.LeScanCallback() {

            @Override
            public void onLeScan(final BluetoothDevice device, int rssi, byte[] scanRecord) {
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        mLeDeviceListAdapter.addDevice(device);
                        mLeDeviceListAdapter.notifyDataSetChanged();
                    }
                });
            }
        };

Answer 1

您是使用BluetoothAdapter来显示设备还是在服务中使用BluetoothGattCallback？

粗体的UUID是否对应于设备的服务UUID？

Answer 2

您是否启用了位置设置？ Android 6.0+需要位置设置。 您应该添加清单：

<uses-feature android:name="android.hardware.bluetooth_le" android:required="true"/>

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

完成此操作后，您必须进入手机设置并手动启用位置权限。 这是通过“设置”>“隐私和安全性”>“应用权限”完成的

不要问我为什么蓝牙需要位置权限。 这对我来说也没有意义。 实际上，即使关闭了位置功能，它仍然需要位置设置。