Untitled

package fr.sti2d.crover;

import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;

import java.util.ArrayList;
import java.util.Set;

public class MainActivity extends AppCompatActivity {

    private BluetoothAdapter bluetoothAdapter;
    private ListView deviceList;


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

        Button btnConnect = findViewById(R.id.boutonconnexion1);
        deviceList = findViewById(R.id.list_devices);

        bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
        if (bluetoothAdapter == null) {
            Toast.makeText(this, "Bluetooth is not supported on this device", Toast.LENGTH_SHORT).show();
            finish();
            return;
        }

        btnConnect.setOnClickListener(view -> showPairedDevices());
    }

    private void showPairedDevices() {
        if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.BLUETOOTH) != PackageManager.PERMISSION_GRANTED) {
            // TODO: Consider calling
            //    ActivityCompat#requestPermissions
            // here to request the missing permissions, and then overriding
            //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
            //                                          int[] grantResults)
            // to handle the case where the user grants the permission. See the documentation
            // for ActivityCompat#requestPermissions for more details.
            return;
        }

        Set<BluetoothDevice> pairedDevices = bluetoothAdapter.getBondedDevices();
        ArrayList<String> deviceNames = new ArrayList<>();

        if (pairedDevices.size() > 0) {
            for (BluetoothDevice device : pairedDevices) {
                if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.BLUETOOTH_CONNECT) != PackageManager.PERMISSION_GRANTED) {
                    // TODO: Consider calling
                    //    ActivityCompat#requestPermissions
                    // here to request the missing permissions, and then overriding
                    //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
                    //                                          int[] grantResults)
                    // to handle the case where the user grants the permission. See the documentation
                    // for ActivityCompat#requestPermissions for more details.
                    return;
                }
                deviceNames.add(device.getName() + "\n" + device.getAddress());
            }
        } else {
            Toast.makeText(this, "No paired devices found", Toast.LENGTH_SHORT).show();
        }

        ArrayAdapter<String> adapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, deviceNames);
        deviceList.setAdapter(adapter);
        deviceList.setOnItemClickListener((adapterView, view, i, l) -> {
            String deviceName = (String) adapterView.getItemAtPosition(i);
            String deviceAddress = deviceName.substring(deviceName.length() - 17);

            // Launch the next activity and pass the selected device's address as an extra
            Intent intent = new Intent(MainActivity.this, roues.class);
            intent.putExtra("device_address", deviceAddress);
            startActivity(intent);
        });
    }
}