Bitmap.compress 对于绘制的图像返回 false
我有一些代码，用户在屏幕上绘制一些内容，我想将其作为 PNG 存储在 byte[] 中。但是，compress() 方法返回 false。知道为什么吗？有没有更好的方法来获取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
}
提前致谢。
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
}
Thanks in advance.
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问题在于我如何创建图像：
当我将其更改为 Bitmap.Config.RGB_565 时，它工作正常。
感谢 Mark Murphy (@commonsware) 在办公时间内提供的建议！
The problem was in how I was creating the image:
When I changed that to
Bitmap.Config.RGB_565it worked fine.Thanks to Mark Murphy (@commonsware) for the advice during his office hours!