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I have a LinearLayout (oriented horizontally) that contains 3 buttons. I want the 3 buttons to have a fixed width and be evenly distributed across the width of the LinearLayout.
I can manage this by setting the gravity of the LinearLayout to center and then adjusting the padding of the buttons, but this works for a fixed width and won't work for different devices or orientations.
<LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center" android:orientation="horizontal"> <Button android:id="@+id/btnOne" android:layout_width="wrap_content" android:layout_height="wrap_content" android:width="120dp" /> <Button android:id="@+id/btnTwo" android:layout_width="wrap_content" android:layout_height="wrap_content" android:width="120dp" /> <Button android:id="@+id/btnThree" android:layout_width="wrap_content" android:layout_height="wrap_content" android:width="120dp" /> </LinearLayout> 
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I suggest you use LinearLayout's weightSum attribute. Adding the tag android:weightSum="3" to your LinearLayout's xml declaration and then android:layout_weight="1" to your Buttons will result in the 3 buttons being evenly distributed.
LinearLayout is a view group that aligns all children in a single direction, vertically or horizontally. You can specify the layout direction with the android:orientation attribute.
RelativeLayout is a view group that displays child views in relative positions. The position of each view can be specified as relative to sibling elements (such as to the left-of or below another view) or in positions relative to the parent RelativeLayout area (such as aligned to the bottom, left or center).
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.
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