Bitmap.com preSS返回false用于绘制图像 [英] Bitmap.compress returns false for drawn image

问题描述

我有一些code，用户绘制屏幕上的内容，我想将其存储在一个byte []一个PNG。然而，COM preSS（）方法返回false。任何想法，这是为什么？有没有更好的方式来获得的byte []？

I have some code where the user draws something on the screen and I want to store it as a PNG in a byte[]. However, the compress() method returns false. Any idea why that is? Is there a better way to get the byte[]?

Bitmap bm = Bitmap.createBitmap(mWidth, mHeight, Bitmap.Config.ALPHA_8);
Canvas c = new Canvas(bm);
c.drawPath(mSignaturePath, mSignaturePaint);
ByteArrayOutputStream out = new ByteArrayOutputStream();
if (bm.compress(Bitmap.CompressFormat.PNG, 100, out)) {
    byte[] result = out.toByteArray(); // Never gets called
}

在此先感谢。

Thanks in advance.

推荐答案

问题是如何，我创建映像：

The problem was in how I was creating the image:

Bitmap bm = Bitmap.createBitmap(mWidth, mHeight, Bitmap.Config.ALPHA_8);

当我改变了这一切，以 Bitmap.Config.RGB_565 它工作得很好。

When I changed that to Bitmap.Config.RGB_565 it worked fine.

感谢马克·墨菲（@commonsware）的意见，在他的办公室小时！

Thanks to Mark Murphy (@commonsware) for the advice during his office hours!

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