Android:如何让我的蓝牙扫描在给定的时间后结束？

import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.os.Handler;

public class MainActivity extends AppCompatActivity {
    private BluetoothAdapter bluetoothAdapter;
    private BroadcastReceiver bluetoothReceiver;

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

        // 获取BluetoothAdapter对象
        bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();

        // 注册BroadcastReceiver来接收蓝牙扫描结果
        bluetoothReceiver = new BroadcastReceiver() {
            @Override
            public void onReceive(Context context, Intent intent) {
                String action = intent.getAction();
                if (BluetoothDevice.ACTION_FOUND.equals(action)) {
                    // 处理扫描到的蓝牙设备
                    BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                    // TODO: 处理蓝牙设备
                }
            }
        };
        IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
        registerReceiver(bluetoothReceiver, filter);

        // 开始蓝牙扫描
        bluetoothAdapter.startDiscovery();

        // 在给定的时间后停止蓝牙扫描
        Handler handler = new Handler();
        handler.postDelayed(new Runnable() {
            @Override
            public void run() {
                bluetoothAdapter.cancelDiscovery();
            }
        }, 5000); // 5秒后停止扫描
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        // 注销BroadcastReceiver
        unregisterReceiver(bluetoothReceiver);
    }
}