I need to implement an Activity Android to find Ble Device available close to my smartphone. So this is my code:

package it.smain;

import android.app.Activity;
import android.content.Context;
import android.content.pm.PackageManager;
import android.location.LocationManager;
import android.os.Bundle;
import android.view.View;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import android.Manifest;
import it.eresult.silvermountain.databinding.ActivityFindDeviceBinding;

public class FindDeviceActivity extends AppCompatActivity {
    private ActivityFindDeviceBinding binding;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        binding = ActivityFindDeviceBinding.inflate(getLayoutInflater());
        View view = binding.getRoot();
        setContentView(view);

    }

    public boolean hasBlePermissions() {
        if (ContextCompat.checkSelfPermission(getApplicationContext(), Manifest.permission.ACCESS_FINE_LOCATION)
                != PackageManager.PERMISSION_GRANTED ||
                ContextCompat.checkSelfPermission(getApplicationContext(), Manifest.permission.ACCESS_COARSE_LOCATION)
                        != PackageManager.PERMISSION_GRANTED) {
            return false;
        } else {
            return true;
        }
    }
    public void requestBlePermissions(final Activity activity, int requestCode) {
        ActivityCompat.requestPermissions(activity,
                new String[]{Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.ACCESS_COARSE_LOCATION},
                requestCode);
    }
    public boolean checkGrantResults(String[] permissions, int[] grantResults) {
        int granted = 0;

        if (grantResults.length > 0) {
            for(int i = 0; i < permissions.length ; i++) {
                String permission = permissions[i];
                if (permission.equals(Manifest.permission.ACCESS_FINE_LOCATION) ||
                        permission.equals(Manifest.permission.ACCESS_COARSE_LOCATION)) {
                    if (grantResults[i] == PackageManager.PERMISSION_GRANTED) {
                        granted++;
                    }
                }
            }
        } else { // if cancelled
            return false;
        }

        return granted == 2;
    }
    public boolean areLocationServicesEnabled(Context context) {
        LocationManager locationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
        try {
            return locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER) ||
                    locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }
}

This is the part of my Android.manifest file to allow bluetooth permission:

<!-- BLUETOOTH -->
    <uses-permission android:name="android.permission.BLUETOOTH"/>
    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
    <uses-permission-sdk-23 android:name="android.permission.ACCESS_FINE_LOCATION"/>
    <uses-permission-sdk-23 android:name="android.permission.ACCESS_COARSE_LOCATION"/>
    <!-- FINE BLUETOOTH -->

Now what can I do to search ble device near my smartphone?