layout_gravity在水平线性布局中不起作用 [英] layout_gravity not working in horizontal linear layout

问题描述

我一直在尝试在水平linear layout中使用layout_gravity.但这似乎不起作用.我不想不想使用relative layout或其他任何布局.我想知道为什么它不能与linear layout一起使用.我早些时候在vertical线性布局中使用了layout_gravity，并且它以我期望的方式工作.

I have been trying to use layout_gravity in a horizontal linear layout. But it doesn't seem to work. I don't want to use a relative layout or any other layout. I want to know why it is not working with linear layout.I have earlier used layout_gravity in vertical linear layouts and it has worked in the way I expected.

<LinearLayout
    android:id="@+id/shata"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal"
    >
    <TextView
        android:id="@+id/title_textview"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:textColor="@color/black"
        android:text="shata1"
        android:textAppearance="?android:attr/textAppearanceMedium"
        />
    <TextView
        android:id="@+id/map_imageview"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_gravity="right"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:text="shata2"/>    
</LinearLayout>

如您所见，线性布局具有orientation=horizontal和width=match_parent(它位于根布局内部).但是，即使我分别指定了它们的layout_gravity=center和layout_gravity=right，两个TextView仍显示在LinearLayout的左侧.

As you can see the the linear layout has a orientation=horizontal and width=match_parent(it is just inside the root layout). But both the TextViews are displayed sticking to the left of the LinearLayouteven though I have given their layout_gravity=center and layout_gravity=right respectively.

推荐答案

简短答案:如果您具有水平的LinearLayout，则每个子项只能具有layout_gravity值，分别为top，bottom和center .

Short answer: If you have a horizontal LinearLayout, then each child can only have layout_gravity values of top, bottom, and center.

这样做的原因是因为您已经告诉LinearLayout按照指定的顺序从左到右水平对齐每个子级，这意味着它仅允许您指定每个子级在垂直方向上的对齐方式. layout_gravity参数，而LinearLayout垂直时则相反.

The reason for this is because you've already told the LinearLayout to align each child horizontally, left-to-right in the order you specify, which means that it only lets you specify the vertical alignment of each child in the layout_gravity parameter, and the opposite applies when your LinearLayout is vertical.

此处有一个很好的链接，解释了各种重力如何工作.

There's a good link explaining how the various gravities work here.

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