如何在android中实现画布上的文本拖拽

public class DragTextView extends View {
    private String text;
    private float x, y;
    private float lastX, lastY;

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

    public DragTextView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    private void init() {
        text = "Drag me";
        x = 100;
        y = 100;
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        canvas.drawText(text, x, y, new Paint());
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        float touchX = event.getX();
        float touchY = event.getY();

        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                lastX = touchX;
                lastY = touchY;
                break;
            case MotionEvent.ACTION_MOVE:
                float offsetX = touchX - lastX;
                float offsetY = touchY - lastY;
                x += offsetX;
                y += offsetY;
                lastX = touchX;
                lastY = touchY;
                invalidate();
                break;
            case MotionEvent.ACTION_UP:
                // 拖拽结束，可以进行相应的处理
                break;
        }

        return true;
    }
}