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00) main_list.xml

• "android:layout_height="match_parent"" is the default height for the item this makes each item takes the whole length of the parent recyclerview ..
• i changed it to "android:layout_height="wrap_content"" using "XML Comand Block" in "Recyclerview1_Adapter"

01) first.xml

• "€€€Add_first.xml€€€" is injected to "l_containerforfirst_xml" which is in "main_list.xml".
• then changed the injection to "<include layout="@layout/first"/>" in "Recyclerview1_Adapter" in "more Blocks" using "XML Comand Block".
• "first.xml" will be added as a child for "l_containerforfirst_xml"

02) second.xml

• we used "ViewStub" with ID "l_containerforsecond_xml" this type of view is an invisible, zero-sized view that can be used to lazily inflate layout resources at runtime. This is useful for optimizing performance by loading views only when they are needed.
• so normally it's not inflated, and you will need to inflate it when needed
• The ViewStub will replace itself in its parent with the inflated view specified in android:layout.
• check "l_containerforsecond_xml" xml injection in main_list.xml

03) third.xml

• is added using a "LayoutInflater"
• it adds "third.xml" a child for "l_containerforthird_xml"

don't forget to define the content that you will use of each child xml

avoid doublicating IDs when adding child xml by xml injection