在Android 12中，需要使用新方法启用BLE扫描权限。要实现此功能，可以使用以下示例代码：

1. 添加以下权限到AndroidManifest.xml文件中：

2. 在你的Activity或Service中，使用以下代码请求BLE扫描权限：

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) { Intent bleScanIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE_BLE_SCAN); startActivityForResult(bleScanIntent, REQUEST_BLE_SCAN_PERMISSION); }

3. 在onActivityResult()方法中检查是否授予了BLE扫描权限：

@Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { if (requestCode == REQUEST_BLE_SCAN_PERMISSION) { if (resultCode == Activity.RESULT_OK) { // Permission was granted, start BLE scan startBleScan(); } else { // Permission denied, show error message or do something else } } else { super.onActivityResult(requestCode, resultCode, data); } }

4. 使用BluetoothLeScanner.startScan()方法开始BLE扫描：

private void startBleScan() { BluetoothManager bluetoothManager = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE); BluetoothLeScanner scanner = bluetoothManager.getAdapter().getBluetoothLeScanner();

ScanSettings settings = new ScanSettings.Builder() .setScanMode(ScanSettings.SCAN_MODE_LOW_LATENCY) .build();

List filters = new ArrayList<>(); ScanFilter filter = new ScanFilter.Builder() .setDeviceName("MyDeviceName") .build(); filters.add(filter);

scanner.startScan(filters, settings, scanCallback); }

5. 在BluetoothAdapter.LeScanCallback中处理扫描结果：

private ScanCallback scanCallback = new ScanCallback() { @Override public void onScanResult(int callbackType, ScanResult result) { super.onScanResult(callbackType, result);

   BluetoothDevice device = result.getDevice();
   // handle scanned device...

}