blocks|key|1227036|text|步骤1:将你想要的任何东西都包装在一个全屏RelativeLayout的屏幕中央。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1227037|步骤#2:为子视图(希望在RelativeLayout中居中显示)赋予android:layout_centerInParent="true"属性。|1227038|entityMap^0|L|E|0|D|E|Z|10|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|R|8|@]|D|@]|E|$]]]|I|$]]

Step #1: Wrap whatever it is you want centered on the screen in a full-screen <code>RelativeLayout</code>.

Step #2: Give that child view (the one, which you want centered inside the <code>RelativeLayout</code>) the <code>android:layout_centerInParent="true"</code> attribute.

blocks|key|1441924|text|您可以通过使用XML属性android:layout_gravity“将居中应用于任何视图，包括布局，您可能想给它赋值"center”。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1441925|您可以在此处找到此选项的可能值的参考：http://developer.android.com/reference/android/widget/LinearLayout.LayoutParams.html#attr_android:layout_gravity|offset|length|1441926|entityMap|0|LINK|mutability|MUTABLE|url|http://developer.android.com/reference/android/widget/LinearLayout.LayoutParams.html#attr_android:layout_gravity^0|0|J|34|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

You can apply a centering to any View, including a Layout, by using the XML attribute android:layout_gravity". You probably want to give it the value "center".

You can find a reference of possible values for this option here:
<a href="http://developer.android.com/reference/android/widget/LinearLayout.LayoutParams.html#attr_android:layout_gravity" rel="noreferrer">http://developer.android.com/reference/android/widget/LinearLayout.LayoutParams.html#attr_android:layout_gravity</a>

blocks|key|1227042|text|<?xml+version="1.0"+encoding="utf-8"?>
<RelativeLayout
++++xmlns:android="http://schemas.android.com/apk/res/android"
++++android:id="@%2Bid/relLayout1"
++++android:layout_width="wrap_content"
++++android:layout_height="wrap_content"
++++android:layout_gravity="center">
++++<ProgressBar
++++++++android:id="@%2Bid/ProgressBar01"
++++++++android:layout_centerInParent="true"
++++++++android:layout_width="wrap_content"
++++++++android:layout_gravity="center"
++++++++android:layout_height="wrap_content"></ProgressBar>
++++<TextView
++++++++android:layout_below="@id/ProgressBar01"
++++++++android:text="@string/please_wait_authenticating"
++++++++android:id="@%2Bid/txtText"
++++++++android:paddingTop="30px"
++++++++android:layout_width="wrap_content"
++++++++android:layout_height="wrap_content"></TextView>
</RelativeLayout>|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1227043|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;RelativeLayout
 xmlns:android="http://schemas.android.com/apk/res/android"
 android:id="@+id/relLayout1"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_gravity="center"&gt;
 &lt;ProgressBar
 android:id="@+id/ProgressBar01"
 android:layout_centerInParent="true"
 android:layout_width="wrap_content"
 android:layout_gravity="center"
 android:layout_height="wrap_content"&gt;&lt;/ProgressBar&gt;
 &lt;TextView
 android:layout_below="@id/ProgressBar01"
 android:text="@string/please_wait_authenticating"
 android:id="@+id/txtText"
 android:paddingTop="30px"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"&gt;&lt;/TextView&gt;
&lt;/RelativeLayout&gt;
</code></pre>

blocks|key|1227146|text|我可以使用以下命令将视图居中|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1227147|android:layout_centerHorizontal="true"+|code-block|syntax|javascript|1227148|和|1227149|android:layout_centerVertical="true"+|1227150|参数。|1227151|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

I was able to center a view using 

<pre><code>android:layout_centerHorizontal="true" 
</code></pre>

and 

<pre><code>android:layout_centerVertical="true" 
</code></pre>

params.

blocks|key|1442014|text|如果要将一个视图居中，请使用此视图。在本例中，TextView必须是XML中最下面的视图，因为它的layout_height是match_parent。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1442015|<TextView+
++++android:id="@%2Bid/tv_to_be_centered"
++++android:layout_height="match_parent"
++++android:layout_width="match_parent"
++++android:gravity="center"
++++android:text="Some+text"
/>|code-block|syntax|javascript|1442016|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

If you want to center one view, use this one. In this case TextView must be the lowermost view in your XML because it's layout_height is match_parent.

<pre><code>&lt;TextView 
 android:id="@+id/tv_to_be_centered"
 android:layout_height="match_parent"
 android:layout_width="match_parent"
 android:gravity="center"
 android:text="Some text"
/&gt;
</code></pre>

blocks|key|1442310|text|更新答案：Constraint+Layout|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1442311|看起来Android现在的趋势是使用约束布局。尽管使用RelativeLayout将视图居中非常简单(正如其他答案所示)，但对于更复杂的布局，ConstraintLayout比RelativeLayout更强大。因此，现在就值得学习如何做。|style|CODE|1442312|要使视图居中，只需将手柄拖动到父视图的所有四个边。|1442313|​|1442314|📷|atomic|1442315|1442316|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.android.com/training/constraint-layout/index.html|1|IMAGE|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/e447afac2077a4505edf2134381230df.gif|imageAlt^0|5|H|0|0|R|E|1Z|G|2G|E|0|0|0|0|1|1|0|0^^$0|@$1|2|3|4|5|6|7|13|8|@]|9|@$A|14|B|15|1|16]]|C|$]]|$1|D|3|E|5|6|7|17|8|@$A|18|B|19|F|G]|$A|1A|B|1B|F|G]|$A|1C|B|1D|F|G]]|9|@]|C|$]]|$1|H|3|I|5|6|7|1E|8|@]|9|@]|C|$]]|$1|J|3|K|5|6|7|1F|8|@]|9|@]|C|$]]|$1|L|3|M|5|N|7|1G|8|@]|9|@$A|1H|B|1I|1|1J]]|C|$]]|$1|O|3|K|5|6|7|1K|8|@]|9|@]|C|$]]|$1|P|3|-4|5|6|7|1L|8|@]|9|@]|C|$]]]|Q|$R|$5|S|T|U|C|$V|W]]|X|$5|Y|T|Z|C|$10|11|12|-4]]]]

<h1>Updated answer: <a href="https://developer.android.com/training/constraint-layout/index.html" rel="noreferrer">Constraint Layout</a></h1>
It seems that the trend in Android now is to use a Constraint layout. Although it is simple enough to center a view using a <code>RelativeLayout</code> (as other answers have shown), the <code>ConstraintLayout</code> is more powerful than the <code>RelativeLayout</code> for more complex layouts. So it is worth learning how do do now.
To center a view, just drag the handles to all four sides of the parent.
<a href="https://i.stack.imgur.com/9BHSe.gif" rel="noreferrer"><img src="https://i.stack.imgur.com/9BHSe.gif" alt="enter image description here" /></a>

blocks|key|1227246|text|它适用于代码有时需要这两个属性|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1227247|android:layout_gravity="center"
android:layout_centerHorizontal="true"|code-block|syntax|javascript|1227248|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

It will work for that code sometimes need both properties 

<pre><code>android:layout_gravity="center"
android:layout_centerHorizontal="true"
</code></pre>

blocks|key|1227184|text|将android:layout_centerInParent="true“添加到要在RelativeLayout中居中的元素|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1227185|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Add android:layout_centerInParent="true" to element which you want to center in the RelativeLayout

blocks|key|1442367|text|使用ConstraintLayout。下面是一个示例，它将根据父屏幕的宽度和高度将视图居中：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1442368|<?xml+version="1.0"+encoding="utf-8"?>
<android.support.constraint.ConstraintLayout+xmlns:android="http://schemas.android.com/apk/res/android"
++++xmlns:app="http://schemas.android.com/apk/res-auto"
++++android:layout_width="match_parent"
++++android:layout_height="match_parent">

++++<LinearLayout+xmlns:android="http://schemas.android.com/apk/res/android"
++++++++android:layout_width="0dp"
++++++++android:layout_height="0dp"
++++++++android:background="#FF00FF"
++++++++android:orientation="vertical"
++++++++app:layout_constraintBottom_toBottomOf="parent"
++++++++app:layout_constraintHeight_percent=".6"
++++++++app:layout_constraintLeft_toLeftOf="parent"
++++++++app:layout_constraintRight_toRightOf="parent"
++++++++app:layout_constraintTop_toTopOf="parent"
++++++++app:layout_constraintWidth_percent=".4"></LinearLayout>
</android.support.constraint.ConstraintLayout>|code-block|syntax|javascript|1442369|您可能需要更改gradle以获得最新版本的ConstraintLayout：|1442370|dependencies+{
...
++++implementation+'com.android.support.constraint:constraint-layout:1.1.3'
}|1442371|​|1442372|📷|atomic|offset|length|1442373|1442374|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/74e9e0635f80c13127591c2acdd122e6.png|imageAlt^0|0|0|0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|11|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|12|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|13|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|14|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|15|8|@]|9|@]|A|$]]|$1|M|3|N|5|O|7|16|8|@]|9|@$P|17|Q|18|1|19]]|A|$]]|$1|R|3|L|5|6|7|1A|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|T|$U|$5|V|W|X|A|$Y|Z|10|-4]]]]

Use ConstraintLayout. Here is an example that will center the view according to the width and height of the parent screen:

<pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:app="http://schemas.android.com/apk/res-auto"
 android:layout_width="match_parent"
 android:layout_height="match_parent"&gt;

 &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="0dp"
 android:layout_height="0dp"
 android:background="#FF00FF"
 android:orientation="vertical"
 app:layout_constraintBottom_toBottomOf="parent"
 app:layout_constraintHeight_percent=".6"
 app:layout_constraintLeft_toLeftOf="parent"
 app:layout_constraintRight_toRightOf="parent"
 app:layout_constraintTop_toTopOf="parent"
 app:layout_constraintWidth_percent=".4"&gt;&lt;/LinearLayout&gt;
&lt;/android.support.constraint.ConstraintLayout&gt;
</code></pre>

You might need to change your gradle to get the latest version of ConstraintLayout:

<pre><code>dependencies {
...
 implementation 'com.android.support.constraint:constraint-layout:1.1.3'
}
</code></pre>

<a href="https://i.stack.imgur.com/EM1iD.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/EM1iD.png" alt="enter image description here"></a>

blocks|key|1442410|text|我使用android:layout_centerInParent="true“，它起作用了|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1442411|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I use 
 android:layout_centerInParent="true"
and it worked

I want to put a layout in the center of the screen.

How to center a View inside of an Android Layout?

Android

我想在屏幕的中央放置一个布局。

问如何在Android布局中居中显示视图？
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