Sometimes some layout files can contain too many views making it difficult to manage the layout file later. To overcome this, Android has an <include> tag that allows the inclusion of other layout files into the main layout file (in below illustration, the activity_main.xml file).
<include android:id="@+id/b_layout" layout="@layout/activity_main_part_b" />The above include statement will add the contents of the layout file activity_main_part_b into the activity_main.xml file.
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