gravity start left 区别

最新推荐文章于 2021-05-27 07:21:26 发布

龙逸柳

最新推荐文章于 2021-05-27 07:21:26 发布

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分类专栏：转载精华文章标签： gravity left start

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本文介绍在Android开发中如何使用START和END重力属性以获得更好的从右至左(RTL)语言支持。通过调整TextView的gravity属性为start，可以确保文本在不同语言习惯下正确对齐。例如，在从右向左阅读的语言环境中，文本将自动对齐到视图右侧。

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原文如下：
#AndroidDev #Protip — use gravities of START and END instead of LEFT and RIGHT for better RTL support. Although the constants are only defined in API 14 [0], they are backward compatible because (1) they're inlined at compile time and (2) they're functionally equivalent to LEFT and RIGHT on earlier devices because of their least-significant bytes:

START = 0x00800003
LEFT = 0x00000003
END = 0x00800005
RIGHT = 0x00000005

Edit: You can see the difference between START and LEFT with <TextView layout_width=match_parent, gravity=start, text=[hebrew characters here]> … the text layout will see your Hebrew characters and align text to the right boundary of the TextView instead of the left because of gravity=start. And note, the default horizontal gravity of TextView is start, not left.

So, left is always left and right is always right, but start and end can be either left or right, depending on the locale.

个人总结：

left是绝对的左边，start会根据不同的国家习惯改变。

比如在从右向左顺序阅读的国家，start代表的就是在右边