BluetoothAdapter不会停止扫描BLE设备

BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
BluetoothAdapter.LeScanCallback leScanCallback = new BluetoothAdapter.LeScanCallback() {
    @Override
    public void onLeScan(final BluetoothDevice device, int rssi, byte[] scanRecord) {
        // 处理扫描到的设备
    }
};

// 启动扫描
bluetoothAdapter.startLeScan(leScanCallback);

// 停止扫描
bluetoothAdapter.stopLeScan(leScanCallback);

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

if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
    ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_COARSE_LOCATION}, REQUEST_CODE);
}

BluetoothLeScanner scanner = bluetoothAdapter.getBluetoothLeScanner();
ScanCallback scanCallback = new ScanCallback() {
    @Override
    public void onScanResult(int callbackType, ScanResult result) {
        super.onScanResult(callbackType, result);
        // 处理扫描结果
    }
};

// 启动扫描
scanner.startScan(scanCallback);

// 停止扫描
scanner.stopScan(scanCallback);

@Override
protected void onPause() {
    super.onPause();
    if (scanner != null) {
        scanner.stopScan(scanCallback);
    }
}