Example 1: First we will design Android Linear Layout without using weight property

In this example we have used one TextView and 4 Button. The orientation is set to vertical.

Below is the code of activity_main.xml

<!-- Vertical Orientation is set -->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <!-- Text Displayed At Top -->

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="Linear Layout (Without Weight)"
        android:id="@+id/textView"
        android:layout_gravity="center_horizontal" />

    <!-- Button Used -->

    <Button
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Button 1"
        android:background="#009300" />

    <Button
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Button 2"
        android:background="#e6cf00" />

    <Button
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Button 3"
        android:background="#0472f9" />

    <Button
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Button 4"
        android:background="#e100d5" />
</LinearLayout>

Example 2: In this example of linear layout we have used weight property.

Below is the code of activity_main.xml with explanation included
<!-- Vertical Orientation is set  with weightSum-->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:weightSum="5"
    android:orientation="vertical">

    <!-- Text Displayed At Top -->

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="Linear Layout (With Weight)"
        android:id="@+id/textView"
        android:layout_gravity="center_horizontal"
        android:layout_weight="0"/>

    <!-- Button Used -->

    <Button
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Button 1"
        android:background="#009300"
        android:layout_weight="1"/>

    <Button
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Button 2"
        android:background="#e6cf00"
        android:layout_weight="1"/>

    <Button
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Button 3"
        android:background="#0472f9"
        android:layout_weight="1"/>

    <Button
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Button 4"
        android:background="#e100d5"
        android:layout_weight="1"/>
</LinearLayout>