android:layout_gravity 和 android:gravity 的区别

分手后的思念是犯贱 2022-06-18 04:51 206阅读 0赞

原文：[http://www.cnblogs.com/ghj1976/archive/2011/04/26/2029535.html][http_www.cnblogs.com_ghj1976_archive_2011_04_26_2029535.html]

gravity 这个英文单词是重心的意思，在这里就表示停靠位置的意思。

**android:layout\_gravity 和 android:gravity 的区别**

从名字上可以看到，android:gravity是对元素本身说的，元素本身的文本显示在什么地方靠着换个属性设置，不过不设置默认是在左侧的。

android:layout\_gravity是相对与它的父元素说的，说明元素显示在父元素的什么位置。

比如说button： android:layout\_gravity 表示按钮在界面上的位置。 android:gravity表示button上的字在button上的位置。

**可选值**

这两个属性可选的值有：top、bottom、left、right、center\_vertical、fill\_vertical、center\_horizontal、fill\_horizontal、center、fill、clip\_vertical。

而且这些属性是可以多选的，用“|”分开。

默认这个的值是：Gravity.LEFT

对这些属性的描述：

出自：

[http://androidmirror.com/guide/topics/resources/drawable-resource.html][http_androidmirror.com_guide_topics_resources_drawable-resource.html]

[http://android.toolib.net/reference/android/graphics/drawable/ClipDrawable.html][http_android.toolib.net_reference_android_graphics_drawable_ClipDrawable.html]

<table style="font-family:'Century Gothic',微软雅黑"> 
 <tbody> 
 <tr style="font-family:'Century Gothic',微软雅黑"> 
 <td style="font-family:'Century Gothic',微软雅黑">Value</td> 
 <td style="font-family:'Century Gothic',微软雅黑">Description</td> 
 </tr> 
 <tr style="font-family:'Century Gothic',微软雅黑"> 
 <td style="font-family:'Century Gothic',微软雅黑">top</td> 
 <td style="font-family:'Century Gothic',微软雅黑">Put the object at the top of its container, not changing its size.&nbsp; 将对象放在其容器的顶部，不改变其大小.</td> 
 </tr> 
 <tr style="font-family:'Century Gothic',微软雅黑"> 
 <td style="font-family:'Century Gothic',微软雅黑">bottom</td> 
 <td style="font-family:'Century Gothic',微软雅黑">Put the object at the bottom of its container, not changing its size.&nbsp; 将对象放在其容器的底部，不改变其大小.</td> 
 </tr> 
 <tr style="font-family:'Century Gothic',微软雅黑"> 
 <td style="font-family:'Century Gothic',微软雅黑">left</td> 
 <td style="font-family:'Century Gothic',微软雅黑">Put the object at the left edge of its container, not changing its size.&nbsp; 将对象放在其容器的左侧，不改变其大小.</td> 
 </tr> 
 <tr style="font-family:'Century Gothic',微软雅黑"> 
 <td style="font-family:'Century Gothic',微软雅黑">right</td> 
 <td style="font-family:'Century Gothic',微软雅黑">Put the object at the right edge of its container, not changing its size.&nbsp; 将对象放在其容器的右侧，不改变其大小.</td> 
 </tr> 
 <tr style="font-family:'Century Gothic',微软雅黑"> 
 <td style="font-family:'Century Gothic',微软雅黑">center_vertical</td> 
 <td style="font-family:'Century Gothic',微软雅黑">Place object in the vertical center of its container, not changing its size.&nbsp; 将对象纵向居中，不改变其大小.&nbsp; 垂直对齐方式：垂直方向上居中对齐。</td> 
 </tr> 
 <tr style="font-family:'Century Gothic',微软雅黑"> 
 <td style="font-family:'Century Gothic',微软雅黑">fill_vertical</td> 
 <td style="font-family:'Century Gothic',微软雅黑">Grow the vertical size of the object if needed so it completely fills its container.&nbsp; 必要的时候增加对象的纵向大小，以完全充满其容器.&nbsp; 垂直方向填充</td> 
 </tr> 
 <tr style="font-family:'Century Gothic',微软雅黑"> 
 <td style="font-family:'Century Gothic',微软雅黑">center_horizontal</td> 
 <td style="font-family:'Century Gothic',微软雅黑">Place object in the horizontal center of its container, not changing its size.&nbsp; 将对象横向居中，不改变其大小.&nbsp; 水平对齐方式：水平方向上居中对齐</td> 
 </tr> 
 <tr style="font-family:'Century Gothic',微软雅黑"> 
 <td style="font-family:'Century Gothic',微软雅黑">fill_horizontal</td> 
 <td style="font-family:'Century Gothic',微软雅黑">Grow the horizontal size of the object if needed so it completely fills its container.&nbsp; 必要的时候增加对象的横向大小，以完全充满其容器.&nbsp; 水平方向填充</td> 
 </tr> 
 <tr style="font-family:'Century Gothic',微软雅黑"> 
 <td style="font-family:'Century Gothic',微软雅黑">center</td> 
 <td style="font-family:'Century Gothic',微软雅黑">Place the object in the center of its container in both the vertical and horizontal axis, not changing its size.&nbsp; 将对象横纵居中，不改变其大小.</td> 
 </tr> 
 <tr style="font-family:'Century Gothic',微软雅黑"> 
 <td style="font-family:'Century Gothic',微软雅黑">fill</td> 
 <td style="font-family:'Century Gothic',微软雅黑">Grow the horizontal and vertical size of the object if needed so it completely fills its container. This is the default.&nbsp; 必要的时候增加对象的横纵向大小，以完全充满其容器.</td> 
 </tr> 
 <tr style="font-family:'Century Gothic',微软雅黑"> 
 <td style="font-family:'Century Gothic',微软雅黑">clip_vertical</td> 
 <td style="font-family:'Century Gothic',微软雅黑">Additional option that can be set to have the top and/or bottom edges of the child clipped to its container's bounds. The clip is based on the vertical gravity: a top gravity clips the bottom edge, a bottom gravity clips the top edge, and neither clips both edges.&nbsp; 附加选项，用于按照容器的边来剪切对象的顶部和/或底部的内容. 剪切基于其纵向对齐设置：顶部对齐时，剪切底部；底部对齐时剪切顶部；除此之外剪切顶部和底部. 垂直方向裁剪 </td> 
 </tr> 
 <tr style="font-family:'Century Gothic',微软雅黑"> 
 <td style="font-family:'Century Gothic',微软雅黑">clip_horizontal</td> 
 <td style="font-family:'Century Gothic',微软雅黑">Additional option that can be set to have the left and/or right edges of the child clipped to its container's bounds. The clip is based on the horizontal gravity: a left gravity clips the right edge, a right gravity clips the left edge, and neither clips both edges.&nbsp; 附加选项，用于按照容器的边来剪切对象的左侧和/或右侧的内容. 剪切基于其横向对齐设置：左侧对齐时，剪切右侧；右侧对齐时剪切左侧；除此之外剪切左侧和右侧. 水平方向裁剪 </td> 
 </tr> 
 </tbody> 
</table>

简单记忆 ： horizontal 都是操作的水平方向，即横向， vertical 都是炒作的垂直方向，即纵向。

**对于LinearLayout何时生效的问题**

参看：也谈layout\_gravity和gravity   
[http://www.lephone.net/viewthread.php?tid=325][http_www.lephone.net_viewthread.php_tid_325]

对于 LinearLayout

当 android:orientation="vertical"  时， 只有水平方向的设置才起作用，垂直方向的设置不起作用。即：left，right，center\_horizontal 是生效的。

当 android:orientation="horizontal" 时， 只有垂直方向的设置才起作用，水平方向的设置不起作用。即：top，bottom，center\_vertical 是生效的。

[http_www.cnblogs.com_ghj1976_archive_2011_04_26_2029535.html]: http://www.cnblogs.com/ghj1976/archive/2011/04/26/2029535.html
[http_androidmirror.com_guide_topics_resources_drawable-resource.html]: http://androidmirror.com/guide/topics/resources/drawable-resource.html
[http_android.toolib.net_reference_android_graphics_drawable_ClipDrawable.html]: http://android.toolib.net/reference/android/graphics/drawable/ClipDrawable.html
[http_www.lephone.net_viewthread.php_tid_325]: http://www.lephone.net/viewthread.php?tid=325