XML : Is it good practice to call XML from another XML in android?

I am new in Android App development and loving this .

Is it good practice to call XML from another XML? Does this means to save app run time ?

XML 1(activity_main):

  <fragment xmlns:android="http://schemas.android.com/apk/res/android"  xmlns:tools="http://schemas.android.com/tools"  android:id="@+id/fragment"  android:name="com.loginfbk.MainFragment"  android:layout_width="match_parent"  android:layout_height="match_parent"  tools:layout="@layout/fragment_main" />    

XML 2(fragment_main):

  <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  xmlns:tools="http://schemas.android.com/tools"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:gravity="center"  android:orientation="vertical"  android:paddingBottom="@dimen/activity_vertical_margin"  android:paddingLeft="@dimen/activity_horizontal_margin"  android:paddingRight="@dimen/activity_horizontal_margin"  android:paddingTop="@dimen/activity_vertical_margin">    <ImageView      android:layout_width="match_parent"      android:layout_height="wrap_content"       android:src="@drawable/messenger_button_white_bg_round"/>      </LinearLayout>