确保在停止扫描前调用LeScanCallback的stopScan方法。以下是一个示例：

private BluetoothAdapter.LeScanCallback mLeScanCallback =
    new BluetoothAdapter.LeScanCallback() {
        @Override
        public void onLeScan(final BluetoothDevice device, int rssi, byte[] scanRecord) {
            // 处理扫描到的蓝牙设备
        }
    };

// 开始扫描设备
private void startScan() {
    BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
    bluetoothAdapter.startLeScan(mLeScanCallback);
}

// 停止扫描设备
private void stopScan() {
    BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
    bluetoothAdapter.stopLeScan(mLeScanCallback);
}