android:id: This is the ID which uniquely identifies the layout.
android:baselineAligned: This must be a boolean value, either “true” or “false” and prevents the layout from aligning its children’s baselines.
android:baselineAlignedChildIndex : When a linear layout is part of another layout that is baseline aligned, it can specify which of its children to baseline align
android:divider : This is drawable to use as a vertical divider between buttons. You use a color value, in the form of “#rgb”, “#argb”, “#rrggbb”, or “#aarrggbb”.
android:gravity : This specifies how an object should position its content, on both the X and Y axes. Possible values are top, bottom, left, right, center, center_vertical, center_horizontal etc.
android:orientation: This specifies the direction of arrangement and you will use “horizontal” for a row, “vertical” for a column. The default is horizontal.
android:weightSum: Sum up of child weight
Example Code with weight Property
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="#0707f1"
android:weightSum="10">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="3"
android:background="#f9f003"
android:orientation="horizontal">
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button"
android:layout_marginRight="20dp"
android:layout_weight="1"/>
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button"
android:layout_weight="1"/>
<Button
android:id="@+id/button21"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button"
android:layout_weight="1"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="3"
android:background="#94f50b"
android:orientation="horizontal">
<Button
android:id="@+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button"
android:layout_weight="1"/>
<Button
android:id="@+id/button4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button"
android:layout_weight="1"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="2"
android:background="#33111b"
android:orientation="horizontal">
<Button
android:id="@+id/button5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button"
android:layout_gravity="center"
android:layout_weight="1"/>
</LinearLayout>
</LinearLayout>
