Android 在线性布局中居中按钮
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Center a button in a Linear layout
提问by themaninthesuitcase
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?
我正在使用线性布局来显示一个非常轻的初始屏幕。它有 1 个按钮，应该水平和垂直居中在屏幕上。但是，无论我尝试做什么，按钮都会顶部对齐中心。我在下面包含了 XML，有人能指出我正确的方向吗？
<?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>
回答by lancha90
Center using a LinearLayout:
使用 LinearLayout 居中：
<LinearLayout
android:id="@+id/LinearLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical" >
<ImageButton
android:id="@+id/btnFindMe"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/findme" />
</LinearLayout>
回答by Dave Webb
If you want to center an item in the middle of the screen don't use a LinearLayoutas these are meant for displaying a number of items in a row.
如果您想在屏幕中间居中显示一个项目，请不要使用 a，LinearLayout因为它们用于在一行中显示多个项目。
Use a RelativeLayoutinstead.
使用 aRelativeLayout代替。
So replace:
所以替换：
android:layout_gravity="center_vertical|center_horizontal"
for the relevant RelativeLayoutoption:
对于相关RelativeLayout选项：
android:layout_centerInParent="true"
So your layout file will look like this:
所以你的布局文件看起来像这样：
<?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>
回答by rui
Have you tried defining android:gravity="center_vertical|center_horizontal"inside the layout and setting android:layout_weight="1"in the image?
您是否尝试过在图像中定义android:gravity="center_vertical|center_horizontal"布局和设置android:layout_weight="1"？
回答by hopcraft
A commonly-used method that works with linear layout is to set a property on the image button
线性布局的一个常用方法是在图像按钮上设置一个属性
android:layout_gravity="center"
You can choose whether to left-align, center-align, or right-align each object in the linear layout. Note that the above line is precisely the same as
您可以选择是左对齐、居中对齐还是右对齐线性布局中的每个对象。请注意，上面的行与
android:layout_gravity="center_vertical|center_horizontal"
回答by Tanmay Sahoo
Add this
添加这个
android:gravity="center"
In LinearLayout.
在线性布局中。
回答by Hans Pour
If you use LinearLayoutyou can add gravity center:
如果你使用LinearLayout你可以添加重心：
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:gravity="center">
<Button
android:layout_width="200dp"
android:layout_height="wrap_content"
/>
</LinearLayout>`
回答by Javier
easy with this
用这个很容易
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:visibility="visible"
android:gravity="center"
android:orientation="vertical" >
<ProgressBar
android:id="@+id/pbEndTrip"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:gravity="center"
android:text="Gettings" />
</LinearLayout>
回答by Vish
<?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="match_parent"
android:layout_height="wrap_content"
android:layout_gravity = "center"
android:background="@drawable/findme">
</ImageButton>
</LinearLayout>
The above code will work.
上面的代码会起作用。
回答by Amit kumar
You can use the RelativeLayout.
您可以使用RelativeLayout.
回答by Reza Mamun
As per the Android documentation for XML Attributes of android:layout_gravity, we can do it easily :)
根据android:layout_gravity 的XML 属性的 Android 文档，我们可以轻松完成:)
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageButton android:id="@+id/btnFindMe"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:background="@drawable/findme"></ImageButton>
</LinearLayout>
