在线性布局中将按钮居中 [英] Center a button in a Linear layout

问题描述

我正在使用线性布局来显示漂亮的初始屏幕.它有1个按钮，该按钮应该在屏幕上水平和垂直居中.但是，无论我尝试做什么，按钮都将使顶部居中对齐.我已经在下面包含了XML，有人可以指出正确的方向吗?

I am using a linear layout to display a pretty light initial screen. It has 1 button that is supposed to centre in the screen both horizontally and vertically. However no matter what I try to do the button will top align centre. I have included the XML below, can some one point me in the right direction?

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <ImageButton android:id="@+id/btnFindMe" 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content"
        android:layout_gravity="center_vertical|center_horizontal"
        android:background="@drawable/findme"></ImageButton>

</LinearLayout>

推荐答案

如果要在屏幕中间居中放置项，请不要使用LinearLayout，因为它们是为了在行.

If you want to center an item in the middle of the screen don't use a LinearLayout as these are meant for displaying a number of items in a row.

改用 RelativeLayout .

所以替换:

android:layout_gravity="center_vertical|center_horizontal"

用于相关的RelativeLayout选项:

android:layout_centerInParent="true"

因此您的布局文件将如下所示:

So your layout file will look like this:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout android:id="@+id/RelativeLayout01" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent"
    xmlns:android="http://schemas.android.com/apk/res/android">

    <ImageButton android:id="@+id/btnFindMe" 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:background="@drawable/findme"></ImageButton>

</RelativeLayout>

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