在MVVM android中使用Firebase进行signOut的正确方法

public class MyViewModel extends ViewModel {
    private MutableLiveData<Boolean> signOutLiveData = new MutableLiveData<>();

    public LiveData<Boolean> getSignOutLiveData() {
        return signOutLiveData;
    }

    public void signOut() {
        FirebaseAuth.getInstance().signOut();
        signOutLiveData.setValue(true);
    }
}

public class MyActivity extends AppCompatActivity {
    private MyViewModel viewModel;

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

        viewModel = ViewModelProviders.of(this).get(MyViewModel.class);

        // 观察signOutLiveData
        viewModel.getSignOutLiveData().observe(this, new Observer<Boolean>() {
            @Override
            public void onChanged(Boolean signOut) {
                if (signOut) {
                    // 执行注销后的操作，例如跳转到登录页面
                    startActivity(new Intent(MyActivity.this, LoginActivity.class));
                    finish();
                }
            }
        });

        // 注销按钮的点击事件
        Button signOutButton = findViewById(R.id.sign_out_button);
        signOutButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                viewModel.signOut();
            }
        });
    }
}