is it possible to evenly distribute buttons across the width of an android linearlayout
Expanding on fedj's answer, if you set layout_width
to 0dp
and set the layout_weight
for each of the buttons to 1, the available width will be shared equally between the buttons.
If you don't want the buttons to scale, but adjust the spacing between the buttons (equal spacing between all buttons), you can use views with weight="1" which will fill the space between the buttons:
<Space
android:layout_width="0dp"
android:layout_height="1dp"
android:layout_weight="1" >
</Space>
<ImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:adjustViewBounds="true"
android:background="@null"
android:gravity="center_horizontal|center_vertical"
android:src="@drawable/tars_active" />
<Space
android:layout_width="0dp"
android:layout_height="1dp"
android:layout_weight="1" >
</Space>
<ImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:adjustViewBounds="true"
android:background="@null"
android:gravity="center_horizontal|center_vertical"
android:src="@drawable/videos_active" />
<Space
android:layout_width="0dp"
android:layout_height="1dp"
android:layout_weight="1" >
</Space>
You can do this by giving both View
s a layout_width
of 0dp
and a layout_weight
of 1
:
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<Button
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"/>
<TextView
android:layout_width="0dp"
android:text="example text"
android:layout_height="wrap_content"
android:layout_weight="1"/>
</LinearLayout>
The way android layout_weight works is that:
- first, it looks to the size that a View would normally take and reserves this space.
- second, if the layout is
match_parent
then it will divide the space that is left in the ratio of thelayout_weight
s. Thus if you gave the Viewslayout_weight="2"
andlayout_weight="1"
,the resultant ratio will be 2 to 1,that is : the first View will get 2/3 of the space that is left and the other view 1/3.
So that's why if you give layout_width
a size of 0dp
the first step has no added meaning since both Views are not assigned any space. Then only the second point decides the space each View
gets, thus giving the View
s the space you specified according to the ratio!
To explain why 0dp
causes the space to devide equally by providing an example that shows the opposite: The code below would result in something different since example text
now has a width that is greater than 0dp
because it has wrap_content
instead making the free space left to divide less than 100% because the text takes space. The result will be that they do get 50% of the free space left but the text already took some space so the TextView
will have well over 50% of the total space.
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<Button
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"/>
<TextView
android:layout_width="wrap_content"
android:text="example text"
android:layout_height="wrap_content"
android:layout_weight="1"/>
</LinearLayout>