android:layout_gravity 和 android:gravity
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://android.toolib.net/reference/android/graphics/drawable/ClipDrawable.html
Value | Description |
top | Put the object at the top of its container, not changing its size. |
bottom | Put the object at the bottom of its container, not changing its size. |
left | Put the object at the left edge of its container, not changing its size. |
right | Put the object at the right edge of its container, not changing its size. |
center_vertical | Place object in the vertical center of its container, not changing its size. |
fill_vertical | Grow the vertical size of the object if needed so it completely fills its container. |
center_horizontal | Place object in the horizontal center of its container, not changing its size. |
fill_horizontal | Grow the horizontal size of the object if needed so it completely fills its container. |
center | Place the object in the center of its container in both the vertical and horizontal axis, not changing its size. |
fill | Grow the horizontal and vertical size of the object if needed so it completely fills its container. This is the default. |
clip_vertical | 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. 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 |
clip_horizontal | 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. 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 |
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
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。
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