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09-Apr-2018 |
Ian Lake <ilake@google.com> |
Create Kotlin DSL for navigation graphs
Allow developers to easily build a NavGraph
programmatically via a Kotlin DSL.
The DSL is started with a call to createGraph(),
an extension method on NavigatorProvider
(as well as NavController and NavHost, for
convenience).
This provides a NavGraphBuilder, the main DSL
for adding destinations to a NavGraph.
Concrete subclasses of NavDestination then
provide an extension method on NavGraphBuilder
and a subclass of NavDestinationBuilder to
insert themselves into the DSL.
This allows developers to write code such as:
val navGraph = navHost.createGraph(startDestination = HOME_ID) {
fragment<HomeFragment>(HOME_ID) {
label = "Home"
action(ACTION_SIGN_IN_ID) {
destinationId = SIGN_IN
}
}
navigation(SIGN_IN, startDestination = LOGIN_ID) {
fragment<LoginFragment>(LOGIN_ID) {
action(NEXT_ID) { destinationId = PASSWORD_ID }
}
fragment<PasswordFragment>(PASSWORD_ID)
}
}
Test: new ktx tests
BUG: 77536435
Change-Id: I29b190c2c26ff03f6607230f239d3fd96fa3c9f6
/frameworks/support/navigation/testing/ktx/src/main/java/androidx/navigation/testing/TestNavigatorDestinationBuilder.kt
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