如何在Android中的Canvas上绘制TextView？

public class MyCustomView extends View {
    private TextView textView;

    public MyCustomView(Context context) {
        super(context);
        init();
    }

    public MyCustomView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    private void init() {
        textView = new TextView(getContext());
        textView.setText("Hello, World!");
        textView.setTextSize(20);
        textView.setTextColor(Color.BLACK);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);

        // 测量TextView的宽度和高度
        textView.measure(MeasureSpec.makeMeasureSpec(canvas.getWidth(), MeasureSpec.EXACTLY),
                MeasureSpec.makeMeasureSpec(canvas.getHeight(), MeasureSpec.EXACTLY));
        // 设置TextView在Canvas上的位置
        textView.layout(0, 0, textView.getMeasuredWidth(), textView.getMeasuredHeight());
        // 将TextView绘制到Canvas上
        textView.draw(canvas);
    }
}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <com.example.MyCustomView
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</RelativeLayout>