【已解决】Android中RelativeLayout的字符水平（垂直居中）对齐

【背景】

此处Android中显示出来的TextView中的内容，水平中间不对其。

想要实现水平居中对齐。

【折腾过程】

1.搜：

android RelativeLayout horizontal center

参考：

android – TextView horizontal center in RelativeLayout – Stack Overflow

试过了：

android:layout_centerHorizontal="true"

但没用。

2.后来看到：

relativelayout – Android Relative Layout Align Center – Stack Overflow

去试了试：

android:layout_centerVertical="true"

才明白：

我上面是错误的搜了horizontal ，实际上该去搜Vertical才对。

现在效果是所需要的了：

【总结】

想要水平居中对齐，则只需要去设置：

android:layout_centerVertical="true"

即可。

【引申】

中找到：

Attribute Name	Related Method	Description
android:layout_above		Positions the bottom edge of this view above the given anchor view ID.
android:layout_alignBaseline		Positions the baseline of this view on the baseline of the given anchor view ID.
android:layout_alignBottom		Makes the bottom edge of this view match the bottom edge of the given anchor view ID.
android:layout_alignEnd		Makes the end edge of this view match the end edge of the given anchor view ID.
android:layout_alignLeft		Makes the left edge of this view match the left edge of the given anchor view ID.
android:layout_alignParentBottom		If true, makes the bottom edge of this view match the bottom edge of the parent.
android:layout_alignParentEnd		If true, makes the end edge of this view match the end edge of the parent.
android:layout_alignParentLeft		If true, makes the left edge of this view match the left edge of the parent.
android:layout_alignParentRight		If true, makes the right edge of this view match the right edge of the parent.
android:layout_alignParentStart		If true, makes the start edge of this view match the start edge of the parent.
android:layout_alignParentTop		If true, makes the top edge of this view match the top edge of the parent.
android:layout_alignRight		Makes the right edge of this view match the right edge of the given anchor view ID.
android:layout_alignStart		Makes the start edge of this view match the start edge of the given anchor view ID.
android:layout_alignTop		Makes the top edge of this view match the top edge of the given anchor view ID.
android:layout_alignWithParentIfMissing		If set to true, the parent will be used as the anchor when the anchor cannot be be found for layout_toLeftOf, layout_toRightOf, etc.
android:layout_below		Positions the top edge of this view below the given anchor view ID.
android:layout_centerHorizontal		If true, centers this child horizontally within its parent.
android:layout_centerInParent		If true, centers this child horizontally and vertically within its parent.
android:layout_centerVertical		If true, centers this child vertically within its parent.
android:layout_toEndOf		Positions the start edge of this view to the end of the given anchor view ID.
android:layout_toLeftOf		Positions the right edge of this view to the left of the given anchor view ID.
android:layout_toRightOf		Positions the left edge of this view to the right of the given anchor view ID.
android:layout_toStartOf		Positions the end edge of this view to the start of the given anchor view ID.

至于每个都是什么效果，就可以自己去多试试就知道了。

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【已解决】Android中RelativeLayout的字符水平（垂直居中）对齐

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