以下是一个使用Android的BluetoothLeScanner类进行BLE设备扫描的简单示例代码：

import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.le.BluetoothLeScanner;
import android.bluetooth.le.ScanCallback;
import android.bluetooth.le.ScanResult;
import android.bluetooth.le.ScanSettings;
import android.content.Context;
import android.os.Bundle;
import android.util.Log;

import java.util.List;

public class MainActivity extends Activity {

    private static final String TAG = "BLEScanner";
    private BluetoothAdapter mBluetoothAdapter;
    private BluetoothLeScanner mBluetoothLeScanner;
    private ScanCallback mScanCallback;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // 获取BluetoothAdapter
        mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();

        // 检查设备是否支持BLE
        if (mBluetoothAdapter == null || !mBluetoothAdapter.isMultipleAdvertisementSupported()) {
            Log.e(TAG, "设备不支持BLE");
            return;
        }

        // 获取BluetoothLeScanner
        mBluetoothLeScanner = mBluetoothAdapter.getBluetoothLeScanner();

        // 设置扫描回调
        mScanCallback = new ScanCallback() {
            @Override
            public void onScanResult(int callbackType, ScanResult result) {
                BluetoothDevice device = result.getDevice();
                Log.d(TAG, "发现设备: " + device.getName() + ", " + device.getAddress());
            }

            @Override
            public void onBatchScanResults(List results) {
                for (ScanResult result : results) {
                    BluetoothDevice device = result.getDevice();
                    Log.d(TAG, "发现设备: " + device.getName() + ", " + device.getAddress());
                }
            }

            @Override
            public void onScanFailed(int errorCode) {
                Log.e(TAG, "扫描失败: " + errorCode);
            }
        };

        // 设置扫描参数
        ScanSettings scanSettings = new ScanSettings.Builder()
                .setScanMode(ScanSettings.SCAN_MODE_LOW_LATENCY)
                .build();

        // 开始扫描
        mBluetoothLeScanner.startScan(null, scanSettings, mScanCallback);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();

        // 停止扫描
        mBluetoothLeScanner.stopScan(mScanCallback);
    }
}

要注意的是，为了进行BLE扫描，需要在AndroidManifest.xml文件中添加以下权限：

希望这个示例能帮助到你！