Android 你可以在RelativeLayout中将按钮居中吗？
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Can you center a Button in RelativeLayout?
提问by Arcadia
I'm trying to center a button in relative layout, is this possible? I've tried the Gravity and Orientation functions but they don't do anything.
我试图在相对布局中将按钮居中，这可能吗？我试过重力和方向功能，但它们什么也没做。
回答by ShadowGod
Try
尝试
android:layout_centerHorizontal="true"
Exactly like this, it works for me:
正是这样，它对我有用：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#ff0000">
<Button
android:id="@+id/btn_mybutton"
android:layout_height="wrap_content"
android:layout_width="124dip"
android:layout_marginTop="5dip"
android:layout_centerHorizontal="true"/>
</RelativeLayout>
回答by Josnidhin
You can use CENTER_IN_PARENT for relative layout.
您可以使用 CENTER_IN_PARENT 进行相对布局。
Add android:layout_centerInParent="true"to element which you want to center in the RelativeLayout
添加android:layout_centerInParent="true"到要在相对布局中居中的元素
回答by Kevin Coppock
Arcadia, just try the code below. There are several ways to get the result you're looking for, this is one of the easier ways.
阿卡迪亚，试试下面的代码。有几种方法可以获得您正在寻找的结果，这是一种更简单的方法。
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/relative_layout"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center">
<Button
android:id="@+id/the_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Centered Button"/>
</RelativeLayout>
Setting the gravity of the RelativeLayout itself will affect all of the objects placed inside of it. In this case, it's just the button. You can use any of the gravity settings here, of course (e.g. center_horizontal, top, right, and so on).
设置 RelativeLayout 本身的重力将影响放置在其中的所有对象。在这种情况下，它只是按钮。当然，您可以在此处使用任何重力设置（例如 center_horizontal、顶部、右侧等）。
You could also use this code below:
您也可以在下面使用此代码：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/relative_layout"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<Button
android:id="@+id/the_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Centered Button"
android:layout_centerInParent="true"/>
</RelativeLayout>
回答by Spektakulatius
Summarized
总结
Adding:
添加：
android:layout_centerInParent="true"
just works on RelativeLayout, if one of the following attributes is also set for the view:
如果还为视图设置了以下属性之一，则仅适用于相对布局：
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
which alignes the child view to the parent view. The "center" is based on the axis of the alignement you have chosen:
它将子视图与父视图对齐。“中心”基于您选择的对齐轴：
left/right -> vertical
左/右 -> 垂直
top/bottom -> horizontal
顶部/底部 -> 水平
Setting the gravity of childs/content inside the view:
在视图中设置子项/内容的重力：
android:gravity="center"
is centering the child inside the parent view in any case, if there is no alignment set. Optional you can choose:
如果没有对齐设置，则无论如何都将子视图置于父视图内。可选您可以选择：
<!-- Axis to Center -->
android:gravity="center_horizontal"
android:gravity="center_vertical"
<!-- Alignment to set-->
android:gravity="top"
android:gravity="bottom"
android:gravity="left"
android:gravity="right"
android:gravity="fill"
...
Then there is:
然后是：
android:layout_gravity="center"
which is centering the view itself inside it's parent
这是将视图本身置于其父级内部的中心
And at last you can add the following attribute to the parents view:
最后，您可以将以下属性添加到父母视图中：
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
回答by KarthikKPN
Use the attribute android:centerInParent="true"inside a view ,
when you want to center the view in Relative layout.
android:centerInParent="true"当您希望在相对布局中将视图居中时，请在视图中使用该属性。
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/main_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<TextView
android:layout_centerInParent="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="NWE"
android:textSize="30dp"/>
</RelativeLayout>
回答by Sheychan
Its easy, dont Align it to anything
很简单，不要将它与任何东西对齐
<Button
android:id="@+id/the_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="Centered Button"/>回答by karma
To center align in one of the direction use android:layout_centerHorizontal="true" or android:layout_centerVertical="true" in the child layout
要在一个方向上居中对齐，请在子布局中使用 android:layout_centerHorizontal="true" 或 android:layout_centerVertical="true"
回答by al881
Removing any alignment like android:layout_alignParentStart="true" and adding centerInParent worked for me. If the "align" stays in, the centerInParent doesn't work
删除任何对齐方式，例如 android:layout_alignParentStart="true" 并添加 centerInParent 对我有用。如果“对齐”保持不变，则 centerInParent 不起作用
回答by Primesh
It's really easy. Try the code below,
这真的很容易。试试下面的代码，
<RelativeLayout
android:id="@+id/second_RL"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@+id/first_RL"
android:background="@android:color/holo_blue_bright"
android:gravity="center">
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button" />
</RelativeLayout>
回答by Divy sindhu
you must have aligned it to left or right of parent view
您必须将其与父视图的左侧或右侧对齐
don't use any of these when using android:centerInParent="true"codes:-
使用android:centerInParent="true"代码时不要使用任何这些 ：-
android:layout_alignParentLeft="true"
android:layout_alignParentLeft="true"
android:layout_alignParentLeft="true"
android:layout_alignParentLeft="true"
android:layout_alignRight=""
android:layout_alignRight=""
etc.
等等。
