android - 如何在画布上绘制可绘制对象？

Question

我做了一个SwipeController扩展类的类Callback。

onChildDraw如下：

@Override
    public void onChildDraw(Canvas c,
                            RecyclerView recyclerView,
                            RecyclerView.ViewHolder viewHolder,
                            float dX, float dY,
                            int actionState, boolean isCurrentlyActive) {
        drawButtons(c, viewHolder);
        if (actionState == ACTION_STATE_SWIPE) {
            setTouchListener(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
        }
        super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
    }

drawButtons方法如下：

private void drawButtons(Canvas c, RecyclerView.ViewHolder viewHolder) {
        float buttonWidthWithoutPadding = buttonWidth - 20;
        float corners = 2;

        View itemView = viewHolder.itemView;
        Paint p = new Paint();

        RectF leftButton = new RectF(itemView.getLeft(), itemView.getTop(), itemView.getLeft() + buttonWidthWithoutPadding, itemView.getBottom());
        p.setColor(Color.BLUE);
        c.drawRoundRect(leftButton, corners, corners, p);
        drawText("EDIT", c, leftButton, p);

        RectF rightButton = new RectF(itemView.getRight() - buttonWidthWithoutPadding, itemView.getTop()+20, itemView.getRight()-20, itemView.getBottom()-20);
        p.setColor(Color.RED);
        c.drawRoundRect(rightButton, corners, corners, p);
        drawText("DELETE", c, rightButton, p);

        buttonInstance = null;
        if (buttonShowedState == ButtonsState.LEFT_VISIBLE) {
            buttonInstance = leftButton;
        }
        else if (buttonShowedState == ButtonsState.RIGHT_VISIBLE) {
            buttonInstance = rightButton;
        }
    }

现在这可以正常工作。但我想使用可绘制的图像，而不仅仅是按钮上的简单文本。有没有办法做到这一点？任何帮助将不胜感激。