40.6 Passing Arguments

Data may be passed from one destination to another during a navigation action by making use of arguments which are declared within the navigation graph file. An argument consists of a name, type and an optional default value and may be added manually within the XML or using the Attributes panel when an action arrow or destination is selected within the graph. In Figure 40-6, for example, an integer argument named contactsCount has been declared with a default value of 0:

Figure 40-6

Once added, arguments are placed within the XML element of the receiving destination, for example:

<fragment

    android:id="@+id/secondFragment"

    android:name="com.ebookfrenzy.navigationdemo.SecondFragment"

    android:label="fragment_second"

    tools:layout="@layout/fragment_second" >

    <argument

...