问App在onActivityResult() API31蓝牙上崩溃

EN

package com.example.ledcontroller;

import android.Manifest;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothManager;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.Toast;

import androidx.activity.result.ActivityResultLauncher;
import androidx.activity.result.contract.ActivityResultContracts;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.content.ContextCompat;

public class MainActivity extends AppCompatActivity {

    private final ActivityResultLauncher<String> requestPermissionLauncher =
            registerForActivityResult(new ActivityResultContracts.RequestPermission(), isGranted -> {
                if (isGranted) {
                    Toast.makeText(getApplicationContext(), "Permission Granted", Toast.LENGTH_SHORT).show();
                } else {
                    Toast.makeText(getApplicationContext(), "Permission not Granted", Toast.LENGTH_SHORT).show();
                }
            });

    ActivityResultLauncher<Intent> someActivityResultLauncher = registerForActivityResult(
            new ActivityResultContracts.StartActivityForResult(),
            result -> {
                if (result.getResultCode() == Activity.RESULT_OK) {
                    // There are no request codes
                    Intent data = result.getData();
                }
            });


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

        //Set Bluetooth status src
        ImageView BtUnchecked = findViewById(R.id.not_connected);
        ImageView BtChecked = findViewById(R.id.connected);


        //BtUnchecked.setImageResource(R.drawable.ic_uncheck_grey);
        //BtChecked.setImageResource(R.drawable.ic_check);

        //Settings button function
        ImageButton sett = findViewById(R.id.settingsbtn);

        sett.setOnClickListener(view -> {
            Intent intent = new Intent(MainActivity.this, SettingsActivity.class);
            startActivity(intent);
        });

        //Color Picker button function
        ImageButton colorpick = findViewById(R.id.colorPickerbtn);

        colorpick.setOnClickListener(view -> {
            Intent intent = new Intent(MainActivity.this, ColorPickerActivity.class);
            startActivity(intent);
        });

        //Modes button function
        ImageButton modes = findViewById(R.id.modesbtn);

        modes.setOnClickListener(view -> {
            Intent intent = new Intent(MainActivity.this, ModesActivity.class);
            startActivity(intent);
        });

        //Bluetooth button function

        BluetoothManager bluetoothManager = getSystemService(BluetoothManager.class);
        BluetoothAdapter bluetoothAdapter = bluetoothManager.getAdapter();



        ImageButton bluetooth = findViewById(R.id.bluetoothbtn);

        bluetooth.setOnClickListener(view -> {
            if (!bluetoothAdapter.isEnabled()){
                if (ContextCompat.checkSelfPermission(this, Manifest.permission.BLUETOOTH_CONNECT) == PackageManager.PERMISSION_GRANTED) {
                    Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
                    someActivityResultLauncher.launch(enableBtIntent);
                } else {
                    requestPermissionLauncher.launch(Manifest.permission.BLUETOOTH_CONNECT);
                }
            }if (bluetoothAdapter.isEnabled()){
                if (ContextCompat.checkSelfPermission(this, Manifest.permission.BLUETOOTH_CONNECT) == PackageManager.PERMISSION_GRANTED) {
                bluetoothAdapter.disable();
                Toast.makeText(getApplicationContext(), "if done", Toast.LENGTH_SHORT).show();
            } else {
                requestPermissionLauncher.launch(Manifest.permission.BLUETOOTH_CONNECT);
                Toast.makeText(getApplicationContext(), "else done", Toast.LENGTH_SHORT).show();
            }
            }
        });
    }

}