什么是"Edit Text"的android:ems属性?
问题说明
Possible Duplicate:
What means Ems? (Android TextView)
在EditText中有一个名为android:ems的属性.说明 是使EditText精确到这么多ems"
In EditText there is an attribute named android:ems. The description is "Makes the EditText be exactly this many ems wide"
ems是什么意思?
What does ems mean?
正确答案
来自: http://www. w3.org/Style/Examples/007/units :
em只是字体大小.在具有2英寸字体的元素中，1em 因此表示2英寸.在em中表示尺寸，例如边距和填充 表示它们与字体大小有关，并且如果用户的字体较大 字体(例如在大屏幕上)或小字体(例如在掌上电脑上) 设备)，尺寸将成比例.声明如 "text-indent:1.5em"和"margin:1em"在CSS中极为常见.
The em is simply the font size. In an element with a 2in font, 1em thus means 2in. Expressing sizes, such as margins and paddings, in em means they are related to the font size, and if the user has a big font (e.g., on a big screen) or a small font (e.g., on a handheld device), the sizes will be in proportion. Declarations such as 'text-indent: 1.5em' and 'margin: 1em' are extremely common in CSS.
em本质上是字体大小的CSS属性.
em is basically CSS property for font sizes.
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