如何使用mvvm模式显示alertDialog框

public class MyViewModel {
    private Context context;

    public MyViewModel(Context context) {
        this.context = context;
    }

    public void showAlert() {
        AlertDialog.Builder builder = new AlertDialog.Builder(context);
        builder.setTitle("提示");
        builder.setMessage("这是一个AlertDialog框");
        builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                // 点击确定按钮的回调逻辑
            }
        });
        builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                // 点击取消按钮的回调逻辑
            }
        });
        AlertDialog alertDialog = builder.create();
        alertDialog.show();
    }
}

<Button
    android:id="@+id/show_alert_button"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="显示AlertDialog框" />

public class MainActivity extends AppCompatActivity {
    private MyViewModel viewModel;

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

        viewModel = new MyViewModel(this);

        Button showAlertButton = findViewById(R.id.show_alert_button);
        showAlertButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                viewModel.showAlert();
            }
        });
    }
}