在 Android 中，位图外观不好看，抖动不起作用
我想在我的应用程序中使用 coverflow 视图。为了获得反射图像部分，我使用了以下代码 - http://www.androidsnippets .com/create-image-with-reflection
我看过很多关于抖动和tileMode的论坛/讨论，我已经尝试了所有讨论的内容，但没有任何对我有用。
仅供参考 - 我正在动态创建位图，而不在布局中使用任何位图。我已附上图像来显示它有多糟糕：
我在下面列出了我的情况已经尝试解决这个问题。
1. getWindow().setFlags(WindowManager.LayoutParams.FLAG_DITHER, WindowManager.LayoutParams.FLAG_DITHER);
2. getWindow().setFormat(PixelFormat.RGBA_8888);
3. BitmapDrawable baseImageDawable = new BitmapDrawable(getResources().openRawResource(imageId));
baseImageDawable.setDither(true);
baseImageDawable.setTileModeXY(Shader.TileMode.REPEAT, Shader.TileMode.REPEAT);
Bitmap originalImage = baseImageDawable.getBitmap();
int width = originalImage.getWidth();
int height = originalImage.getHeight();
Bitmap reflectionImage = Bitmap.createBitmap(originalImage, 0, 0, width, height, matrix, true);
但反射图像仍然很丑陋。
我该如何解决这个问题？
I want to use coverflow view in my app. To get the reflection image part i have used the following code - http://www.androidsnippets.com/create-image-with-reflection
I have seen lot of forums/discussions about dithering and tileMode, I have tried all that discussed but nothing works for me.
FYI - I am creating a bitmap dynamically not using any bitmap in layouts. And I have attached the image to show how bad it is:
I have listed below what I have tried to solve this issue.
1. getWindow().setFlags(WindowManager.LayoutParams.FLAG_DITHER, WindowManager.LayoutParams.FLAG_DITHER);
2. getWindow().setFormat(PixelFormat.RGBA_8888);
3. BitmapDrawable baseImageDawable = new BitmapDrawable(getResources().openRawResource(imageId));
baseImageDawable.setDither(true);
baseImageDawable.setTileModeXY(Shader.TileMode.REPEAT, Shader.TileMode.REPEAT);
Bitmap originalImage = baseImageDawable.getBitmap();
int width = originalImage.getWidth();
int height = originalImage.getHeight();
Bitmap reflectionImage = Bitmap.createBitmap(originalImage, 0, 0, width, height, matrix, true);
But still the reflection image is very ugly.
How can I solve this?
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嗯。我“认为”你的问题是你的位图没有被创建为 ARGB_8888 （尽管你调用了 setFormat ）。我“建议”，不要使用 openRawResource 创建位图可绘制对象，而是使用 BitmapFactory 并确保指定 Bitmap.Config.ARGB_8888。然后从位图制作您的可绘制对象。只是一个想法——如果不能踏上日食，很难猜测这个距离。您可能会发现这篇文章很有趣：http:// /www.curious-creature.org/2010/12/08/bitmap-quality-banding-and-dithering/
编辑：所以，问题显然在于对 createBitmap 的调用被用来分配反射图像。这个故事的寓意（恕我直言）：永远不要使用不允许您显式指定 Bitmap.Config 的 createBitmap 方法。否则，正如阿甘所说，你永远不知道你会得到什么。
Hmmm. I "think" your problem is that your bitmap is not being created as ARGB_8888 (despite your setFormat call). I would "suggest," instead of creating the Bitmap drawable using openRawResource, use BitmapFactory and make sure you specify Bitmap.Config.ARGB_8888. Then make your drawable from the bitmap. Just a thought--hard to guess at this distance without being able to step with eclipse. You might find this article interesting: http://www.curious-creature.org/2010/12/08/bitmap-quality-banding-and-dithering/
Edit: So, the problem, apparently, was in the call to createBitmap being used to allocate the reflectionImage. Moral of the story (IMHO): never use createBitmap methods that do not allow you to explicitly specify Bitmap.Config. Otherwise, as Forrest Gump might say, you never know what you're gonna get.
我找到了应该设置配置的位置。创建反射位图时，将配置设置为 ARGB_8888。现在可以使用了。
I found the location where should I set the config. While creating the reflection bitmap set the config as ARGB_8888. Its working now.