在android中将画布转换为位图图像 [英] converting a canvas into bitmap image in android

问题描述

我正在尝试在画布上开发一个应用程序，我正在画布上绘制位图.绘制后，我正在尝试转换为位图图像.

I am trying to develop an app on canvas,I am drawing a bitmap on the canvas. After drawing, I am trying to convert into bitmap image.

谁能给我一个建议?

推荐答案

建议取决于您要尝试做什么.

Advice depends upon what you are trying to do.

如果您担心您的控件需要很长时间来绘制，并且您想绘制到位图以便您可以对位图进行 blit 而不是通过画布重新绘制，那么您不要em> 希望对平台进行双重猜测 - 控件自动将其绘图缓存到临时位图，甚至可以使用 getDrawingCache()

If you are concerned that your controls take a long time to draw, and you want to draw to a bitmap so you can blit the bitmap rather than re-drawing via a canvas, then you don't want to be double-guessing the platform - controls automatically cache their drawing to temporary bitmaps, and these can even be fetched from the control using getDrawingCache()

如果你想使用画布绘制位图，通常的方法是:

If you want to draw using a canvas to a bitmap, the usual recipe is:

1. 使用 Bitmap.createBitmap()
2. 使用Canvas(Bitmap) 构造函数
3. 在画布上绘制
4. 使用位图

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