在Android的，我定义的的ImageView 的 layout_width 是 FILL_PARENT （它接受了电话的全宽）。

In Android, I defined an ImageView's layout_width to be fill_parent (which takes up the full width of the phone).

如果我投入到的ImageView 图像大于 layout_width ，Android将它的规模，对不对？但怎么样的高度？当Android的缩放图像，将其保持纵横比？

If the image I put to ImageView is bigger than the layout_width, Android will scale it, right? But what about the height? When Android scales the image, will it keep the aspect ratio?

我发现是，有在顶部和底部的一些空白的的ImageView 当Android的缩放图像是大于 ImageView的。真的吗？如果是的话，我怎么能消除空白？

What I find out is that there is some white space at the top and bottom of the ImageView when Android scales an image which is bigger than the ImageView. Is that true? If yes, how can I eliminate that white space?

推荐答案

1）是的，默认情况下，Android将会扩展您的形象，以适应ImageView的，保持纵横比。但是，请确保您使用的是 Android上的图像设置为ImageView的：SRC =...，而不是安卓背景=。 ..。 SRC = 使缩放图像保持高宽比，但背景= 使其规模的和扭曲图像，使其完全适合于ImageView的大小。 （可以使用一个背景，并在同一时间，虽然一源，它可以是对于像显示绕主图像的帧，只使用一个ImageView的是有用的。）

1) Yes, by default Android will scale your image down to fit the ImageView, maintaining the aspect ratio. However, make sure you're setting the image to the ImageView using android:src="..." rather than android:background="...". src= makes it scale the image maintaining aspect ratio, but background= makes it scale and distort the image to make it fit exactly to the size of the ImageView. (You can use a background and a source at the same time though, which can be useful for things like displaying a frame around the main image, using just one ImageView.)

2）你也应该看到安卓adjustViewBounds 使ImageView的调整自身以适应重新缩放图像。例如，如果您有什么通常是一个正方形的ImageView矩形图像，adjustViewBounds = true，将使其调整ImageView的是矩形为好。然后，这会影响其他是如何看待的布局方式围绕ImageView的。

2) You should also see android:adjustViewBounds to make the ImageView resize itself to fit the rescaled image. For example, if you have a rectangular image in what would normally be a square ImageView, adjustViewBounds=true will make it resize the ImageView to be rectangular as well. This then affects how other Views are laid out around the ImageView.

然后为Samuh写的，你可以改变它默认使用 Android的尺度图像的方式：scaleType 参数。顺便说一句，最简单的方法来发现它是如何工作也只会被自己实验一下！不过，别忘了看看模拟器本身（或实际的电话）布局为preVIEW在Eclipse中通常是错误的。

Then as Samuh wrote, you can change the way it default scales images using the android:scaleType parameter. By the way, the easiest way to discover how this works would simply have been to experiment a bit yourself! Just remember to look at the layouts in the emulator itself (or an actual phone) as the preview in Eclipse is usually wrong.