Linear Layout

LinearLayout 

is a view group that aligns all children in vertical or horizontal direction. To specify the layout direction use android:orientation attribute.

Example of Linear Layout 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent"
   android:orientation="vertical" >
   
   <Button android:id="@+id/btnStart"
      android:layout_width="200dp"
      android:layout_height="wrap_content"
      android:text="start"/>
      
   <Button android:id="@+id/btnPause"
      android:layout_width="200dp"
      android:layout_height="wrap_content"
      android:text="pause"/>
      
   <Button android:id="@+id/btnStop"
      android:layout_width="200dp"
      android:layout_height="wrap_content"
      android:text="stop"/>
      
</LinearLayout>