Defining IDs

If a view needs to be accessed via Java code (see Section 19.2, “Accessing views from the layout in the activity ”), you have to give the View a unique ID via the android:id attribute. To assign a new ID to a View use . The following shows an example in which a @+id/yourvalue Button gets the button1 ID assigned.

<Button
  android:id="@+id/button1"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:text="Show Preferences" >
</Button> 

By conversion this will create and assign a new yourvalue ID to the corresponding view.