I have two buttons in a horizontal LinearLayout. They are currently next to each other and the very left. I want to move the second button to the right end of the LinearLayout. I tried android:gravity on these buttons but this didn't change the position of them at all. Thanks
The easiest way to do this is to use RelativeLayout
. You can give your Button
you want on the right the property alignParentRight="true"
.
<Button
...
android:layout_alignParentRight="true"/>
For a horizontal LinearLayout
, android:layout_graivty
(which is what you would want instead of android:gravity
) left and right won't do anything because the Views
are already placed from right to left.
See this answer on the difference between android:gravity
and android:layout_gravity
if you are uncertain about those.
Edit
Depending on exactly what you need/want, it is possible to do this with a LinearLayout
though probably still much easier and more flexible with a RelativeLayout
. Anyway, you can use weight
to achieve something similar and play with the values. The following gives me a Button
on the left and a Button
on the right.
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<Button
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Left Button"/>
<View
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="2"
android:text="Right Button"/>
<Button
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Right Button"/>
</LinearLayout>
You cannot achieve this using a LinearLayout
.
Use a RelativeLayout
instead and place each button relative to RelativeLayout
right or left. Something like below example:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:text="Button" />
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/button1"
android:layout_alignParentRight="true"
android:text="Button" />
</RelativeLayout>
Try setting the left button's layout_gravity
to left
(or start
) and the right button's layout_gravity
to right
(or end
).
The problem is that you are currently using gravity
which
Specifies how an object should position its content, on both the X and Y axes, within its own bounds.
Instead, you should use layout_gravity
that is
Standard gravity constant that a child supplies to its parent. Defines how the child view should be positioned, on both the X and Y axes, within its enclosing layout.
In other words - you are currently telling the buttons how to align their child views, instead of telling them how to be aligned within their parent.
您可以设置android:layout_weight='1'
并且两个按钮将平均共享屏幕(并排),或者如果您想要它们之间的额外空间,您可以在线性布局中放置一个按钮并设置android:layout_gravity
到left
和right
的每个。
Add a RelativeLayout
and set values to layout_marginLeft
, layout_marginTop
, etc.
eg. android:layout_marginLeft="32dp" android:layout_marginTop="160dp"
使 linearLayout 方向垂直,并根据需要设置按钮的重力 =>中心。
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