我用我自己的图标图像作为指标ExpandableListView，但图标似乎被拉长，我试图把图像文件/绘制和/绘制，华电国际，没有运气。如果我不使用我自己的图标，内置了Android一个看起来不错，所以我不知道是否有图像尺寸任何限制，或者是有什么我做错了？

I use my own icon image as indicator for ExpandableListView, but the icon seems to be stretched, I tried to put the image file in /drawable and /drawable-hdpi with no luck. If I do not use my own icon, the built-in Android one looks nice, so I wonder is there any restriction on image dimension, or is there anything I've done wrong?

谢谢！

推荐答案

无论图像您使用的是作为你组的指标，使之成为9补丁（xxx.9.png）的图像，并设置其拉伸区域周围边框像素（这大概可以是透明的）。它将prevent从中间延伸的形象。

Whatever image you are using as your group indicator, make it a 9 patch (xxx.9.png) image and set its stretchable areas to around the border pixels (which probably may be transparent). It will prevent stretching of image from the middle.