画布上的可绘制图像 [英] Drawable image on a canvas

问题描述

如何将图像放到画布上以便在该图像上绘图?

How can I get an image to the canvas in order to draw on that image?

推荐答案

在画布上绘制 Drawable 的好方法不是自己解码，而是让系统去做:

The good way to draw a Drawable on a canvas is not decoding it yourself but leaving it to the system to do so:

Drawable d = getResources().getDrawable(R.drawable.foobar, null);
d.setBounds(left, top, right, bottom);
d.draw(canvas);

这将适用于所有类型的可绘制对象，而不仅仅是位图.并且这也意味着你可以再次使用同一个 drawable，如果只是尺寸改变了.

This will work with all kinds of drawables, not only bitmaps. And it also means that you can re-use that same drawable again if only the size changes.

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