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Margins in group layouts do not seem to work.
For example,
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_margin="40dip" android:layout_width="match_parent" android:layout_height="match_parent"> <Button android:id="@+id/button" android:layout_width="match_parent" android:layout_height="match_parent" android:text="I'm a button" /> </LinearLayout> should display a button with 40p margins on all sides. However, it has 80p margins on the right and bottom.
Am I doing something wrong? Is this a bug?
A workaround would be to use gravity, but this only works with even margins.
BTW, there is a similar question posted here but has not been answered.
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Android Layout Types Android provides the following ViewGroups or layouts: LinearLayout : is a ViewGroup that aligns all children in a single direction, vertically or horizontally. RelativeLayout : is a ViewGroup that displays child views in relative positions.
Frame Layout: This is designed to block out an area on the screen to display a single item. Linear Layout: A layout that arranges its children in a single column or a single row. Relative Layout: This layout is a view group that displays child views in relative positions.
Results show that the fastest layout is Relative Layout, but difference between this and Linear Layout is really small, what we can't say about Constraint Layout. More complex layout but results are the same, flat Constraint Layout is slower than nested Linear Layout.
android:padding="40dp" on the LinearLayout or android:layout_margin="40dp" on the Button will give you the effect you want. Padding defines the space between a views edges and its content, layout margin defines extra space on the sides of a view.
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