如何在 Android 布局中居中视图？
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How to center a View inside of an Android Layout?
提问by Vicky
I want to put a layout in the center of the screen.
我想在屏幕中央放置一个布局。
回答by CommonsWare
Step #1: Wrap whatever it is you want centered on the screen in a full-screen RelativeLayout.
第 1 步：将您想要的任何内容以全屏方式包裹在屏幕中央RelativeLayout。
Step #2: Give that child view (the one, which you want centered inside the RelativeLayout) the android:layout_centerInParent="true"attribute.
第 2 步：为该子视图（您希望在 内居中的那个RelativeLayout）提供android:layout_centerInParent="true"属性。
回答by Eric Mill
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".
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。您可能希望为其提供值“center”。
You can find a reference of possible values for this option here: http://developer.android.com/reference/android/widget/LinearLayout.LayoutParams.html#attr_android:layout_gravity
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
回答by Pentium10
<?xml version="1.0" encoding="utf-8"?>
<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">
<ProgressBar
android:id="@+id/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="@+id/txtText"
android:paddingTop="30px"
android:layout_width="wrap_content"
android:layout_height="wrap_content"></TextView>
</RelativeLayout>
回答by Krishna Singh
I was able to center a view using
我能够使用
android:layout_centerHorizontal="true"
and
和
android:layout_centerVertical="true"
params.
参数。
回答by Suragch
Updated answer: Constraint Layout
更新答案：约束布局
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 RelativeLayout(as other answers have shown), the ConstraintLayoutis more powerful than the RelativeLayoutfor more complex layouts. So it is worth learning how do do now.
现在看来，Android 的趋势是使用 Constraint 布局。尽管使用 a 使视图居中很简单RelativeLayout（如其他答案所示），ConstraintLayout但RelativeLayout对于更复杂的布局，它比 更强大。所以现在怎么做是值得学习的。
To center a view, just drag the handles to all four sides of the parent.
要将视图居中，只需将手柄拖动到父级的所有四个边。
回答by Maksim Dmitriev
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.
如果要使一个视图居中，请使用此视图。在这种情况下，TextView 必须是 XML 中最下面的视图，因为它的 layout_height 是 match_parent。
<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"
/>
回答by Md Nazrul Islam
It will work for that code sometimes need both properties
它适用于该代码有时需要两个属性
android:layout_gravity="center"
android:layout_centerHorizontal="true"
回答by Rasika Sugathadasa
Add android:layout_centerInParent="true" to element which you want to center in the RelativeLayout
将 android:layout_centerInParent="true" 添加到要在 RelativeLayout 中居中的元素
回答by live-love
Use ConstraintLayout. Here is an example that will center the view according to the width and height of the parent screen:
使用约束布局。这是一个示例，它将根据父屏幕的宽度和高度将视图居中：
<?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>
You might need to change your gradle to get the latest version of ConstraintLayout:
您可能需要更改您的 gradle 以获得最新版本的 ConstraintLayout：
dependencies {
...
implementation 'com.android.support.constraint:constraint-layout:1.1.3'
}
回答by James Idowu
I use android:layout_centerInParent="true" and it worked
我使用 android:layout_centerInParent="true" 并且它有效
