画布转换成位图图像的android [英] converting a canvas into bitmap image in android

问题描述

我想向发展在画布上的应用程序，我在画布上用位​​图。经过图纸绘制，我想转换成位图图像。

I am trying to develope an app on canvas ,i am drawing on canvas with bitmap .After drawing,i am trying to convert into bitmap image .

谁能给我suggession

can anyone give me suggession

请多关照

推荐答案

咨询意见取决于你正在努力做的事情。

Advice depends upon what you are trying to do.

如果您担心您的控件需要很长的时间来画，你想画成位图，所以你可以的blit的位图，而不是通过一个帆布重新绘制，那么你的不希望双猜平台 - 控制自动缓存它们的绘制临时的位图，而这些甚至可以从使用​​控制<一个获取href="http://developer.android.com/reference/android/view/View.html#getDrawingCache%28%29"><$c$c>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()

如果你想用一个帆布为位图绘制，通常的配方是：

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

1. 创建正确大小的使用位图<一href="http://developer.android.com/reference/android/graphics/Bitmap.html#createBitmap%28int,%20int,%20android.graphics.Bitmap.Config%29"><$c$c>Bitmap.createBitmap()
2. 创建一个帆布的实例指出，这种使用位图<一href="http://developer.android.com/reference/android/graphics/Canvas.html#Canvas%28android.graphics.Bitmap%29"><$c$c>Canvas(Bitmap)构造
3. 画到画布
4. 使用位图

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