<merge> is used for optimizing layouts.It is used for reducing unnecessary nesting.
when a layout containing <merge> tag is added into another layout,the <merge> node is removed and its child view is added directly to the new parent.

<Button

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="@string/add"/>

<Button

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="@string/delete"/>

</merge>

Include Layout

Inside the layout to which you want to add the re-usable component, add the <include/> tag. For example, here's a layout that includes the title bar from above:

<include

android:id="@+id/some_id_if_needed"

layout="@layout/some_layout"/>

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