如何在android + viewModel中进行回调

public class MyViewModel extends ViewModel {
    private MutableLiveData<String> callbackData = new MutableLiveData<>();

    public void setCallbackData(String data) {
        callbackData.setValue(data);
    }

    public LiveData<String> getCallbackData() {
        return callbackData;
    }
}

public class MyActivity extends AppCompatActivity {
    private MyViewModel viewModel;

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

        viewModel = new ViewModelProvider(this).get(MyViewModel.class);

        viewModel.getCallbackData().observe(this, new Observer<String>() {
            @Override
            public void onChanged(String data) {
                // 在这里处理回调数据
                // 可以更新UI或执行其他操作
            }
        });
    }
}

public class MyCallbackClass {
    private MyViewModel viewModel;

    public MyCallbackClass(MyViewModel viewModel) {
        this.viewModel = viewModel;
    }

    public void performCallback(String data) {
        // 执行回调操作
        viewModel.setCallbackData(data);
    }
}