Layout XML Code (Cont.)

A layout defines the visual structure for a user interface, such as the UI for an activity or app widget. Below are some of the common layout types that are built into the Android platform. The layout file activity_main.xml, one of the two screens of this application, is given next.

Linear layout



A layout that organizes its children into a single horizontal or vertical row. It creates a scrollbar if the length of the window exceeds the length of the screen. 		Relative layout



Enables you to specify the location of child objects relative to each other (child A to the left of child B) or to the parent (aligned to the top of the parent). 		Web view



Displays web pages.

HelloWorld/app/src/main/res/layout/activity_main.xml 
<LinearLayout
  xmlns:android            = "http://schemas.android.com/apk/res/android"
  android:orientation      = "vertical"
  android:layout_width     = "fill_parent"
  android:layout_height    = "fill_parent"
  android:weightSum        = "1"
  android:gravity          = "center">
  <TextView
    android:layout_width   = "wrap_content"
    android:layout_height  = "wrap_content"
    android:textAppearance = "?android:attr/textAppearanceLarge"
    android:text           = "Hello, your name:"
    android:layout_weight  = "0.07"
    android:textStyle      = "bold" />
  <EditText
    android:layout_width   = "216dp"
    android:layout_height  = "wrap_content"
    android:id             = "@+id/name" />
  <Button
    android:layout_width   = "wrap_content"
    android:layout_height  = "wrap_content"
    android:text           = "@string/next_page"
    android:id             = "@+id/next" />
</LinearLayout>




      “Waiter, the steak is smelling very strongly of liquor!”    
      The waiter backs up 3 steps and asks, “How’s that now?”