無法發現BLE設備

Question

我有一個BLE設備。 設備有一個按鈕。 目標是在按下設備按鈕時觸發android設備中的某些操作。

我的問題是，我能夠通過系統藍牙掃描器發現並與BLE設備配對。 但是當我使用BLE掃描內部代碼（與Google代碼相同）時，我看不到設備。

我的清單中有我的關注標簽。

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

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

這是我的gradle設置

minSdkVersion 18, targetSdkVersion 22

Phone- Nexus 5 | Android M

這是日志。 如您所看到的粗體字所示，它會發現設備，但不會添加它。 知道為什么會這樣嗎？

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--

這是我的代碼片段

   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來顯示設備還是在服務中使用BluetoothGattCallback？

粗體的UUID是否對應於設備的服務UUID？

Answer 2

您是否啟用了位置設置？ Android 6.0+需要位置設置。 您應該添加清單：

<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，您必須進入手機設置並手動啟用位置權限。 這是通過“設置”>“隱私和安全性”>“應用權限”完成的

不要問我為什么藍牙需要位置權限。 這對我來說也沒有意義。 實際上，即使關閉了位置功能，它仍然需要位置設置。