[代码] main.xml
01 |
<? xml version = "1.0" encoding = "utf-8" ?> |
02 |
< RelativeLayout xmlns:Android = "http://schemas.android.com/apk/res/android" |
03 |
Android:layout_width = "fill_parent" |
04 |
Android:layout_height = "fill_parent" > |
05 |
< TextView Android:id = "@+id/gallerytext" |
06 |
Android:layout_width = "fill_parent" |
07 |
Android:layout_height = "wrap_content" > |
08 |
</ TextView > |
09 |
< Gallery Android:id = "@+id/gallery" |
10 |
Android:layout_width = "fill_parent" |
11 |
Android:layout_height = "wrap_content" > |
12 |
</ Gallery > |
13 |
< Button Android:id = "@+id/btngal" |
14 |
Android:layout_width = "wrap_content" |
15 |
Android:layout_height = "wrap_content" |
16 |
Android:gravity = "center_horizontal" |
17 |
Android:textSize = "20sp" |
18 |
Android:layout_alignParentBottom = "true" |
19 |
Android:layout_centerHorizontal = "true" |
20 |
Android:text = "返回主界面" /> |
[代码] 简单说明
1 |
可以看到Button 与Gallery的对齐方式是居中对齐,也即Button 与Parent居中对齐。 |
2 |
另外, |
3 |
Android:gravity="CENTER_VERTICAL“:这个是垂直居中对齐 |
4 |
Android:gravity="BOTTOM”:放在容器的底部 |
5 |
Android:gravity="CENTER“ :放在容器的中心 |