如何让Android中的ImageButton根据屏幕密度自动缩放？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/2047554/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
How to make ImageButton in Android automatically scale based on screen density?
提问by Randy Sugianto 'Yuku'
I have an image put on an ImageButton, which looks good on a mdpi (medium-dpi) screen. However, when the device has a hdpi (high-dpi) screen, the image is still pixel-by-pixel accurate, which look small on the device screen.
我有一个图像放在ImageButton，它在 mdpi（中等 dpi）屏幕上看起来不错。但是，当设备具有 hdpi（高 dpi）屏幕时，图像仍然是逐像素精确的，在设备屏幕上看起来很小。
How do I make such that the image (and therefore the ImageButton) scaled based on the density-independent pixels (dpor dip) instead of pixels?
如何使图像（以及ImageButton）基于与密度无关的像素（dp或dip）而不是像素进行缩放？
回答by Michael
android:scaleType="fitXY"
Other choices include :
其他选择包括：
fitStart
fitCenter
fitEnd
center
cenerCrop
centerInside
matrix
Mind you i'm lazy and use really large PNG images in a raw folder.
请注意，我很懒惰，并且在原始文件夹中使用了非常大的 PNG 图像。
回答by ponkin
IMHO you should look pretty close to NinePatchDrawable. There is, actually, a toolthat will help you to make your icon(pictures/icons/whatever...) resizable depending on size of container. It`s really simple and works just fine for my needs. Also look at this article(part "NinePatchDrawable"), it explains the NinePatchDrawable mechanism.
恕我直言，你应该看起来非常接近NinePatchDrawable。实际上，有一种工具可以帮助您根据容器的大小调整图标（图片/图标/任何...）的大小。它真的很简单，并且可以很好地满足我的需求。另请看这篇文章（“NinePatchDrawable”部分），它解释了 NinePatchDrawable 机制。
A NinePatchDrawable graphic is a stretchable bitmap image, which Android will automatically resize to accomodate the contents of the View in which you have placed it as the background. An example use of a NinePatch is the backgrounds used by standard Android buttons — buttons must stretch to accommodate strings of various lengths. A NinePatch drawable is a standard PNG image that includes an extra 1-pixel-wide border. It must be saved with the extension .9.png, and saved into the res/drawable/ directory of your project.
NinePatchDrawable 图形是可拉伸的位图图像，Android 会自动调整其大小以适应您将其作为背景放置的视图的内容。一个使用 NinePatch 的示例是标准 Android 按钮使用的背景——按钮必须拉伸以适应不同长度的字符串。NinePatch drawable 是标准的 PNG 图像，包含额外的 1 像素宽边框。它必须以扩展名 .9.png 保存，并保存到项目的 res/drawable/ 目录中。
回答by Roman Nurik
As ponkin mentioned, 9-patches are your best bet. Combined with resource directory qualifiers (drawable-hdpi, drawable-mdpi, etc.) you can make assets that look good at any density and size.
正如 ponkin 所提到的，9-patches 是你最好的选择。结合资源目录限定符（drawable-hdpi、drawable-mdpi等），您可以制作在任何密度和大小下看起来都不错的资产。
An example of 9-patches and resource directory qualifiers can be found in the Multiple ResolutionsAndroid SDK sample. The semi-transparent, black, rounded-corner background is implemented as a 9-patch with different PNGs for ldpi, mdpi, and hdpi.
可以在多分辨率Android SDK 示例中找到 9 补丁和资源目录限定符的示例。半透明、黑色、圆角背景作为 9-patch 实现，具有用于 ldpi、mdpi 和 hdpi 的不同 PNG。
回答by Fedor
Maybe you should just specify button size in device-independent-pixels?
也许您应该只在与设备无关的像素中指定按钮大小？
android:layout_width="300dip"
android:layout_height="50dip"
