This project is an experiment to integrate Jetpack Compose into a legacy Android application. The main goal is to use a generic Activity or Fragment as the entry point within a Compose module, utilizing the latest navigation-compose library to enable navigation at any point in the legacy application.
The primary objective of this project is to demonstrate how to:
- Integrate Jetpack Compose in a legacy Android project.
- Use
navigation-composeto handle navigation with serializable classes. - Navigate through various parts of the legacy application using
ComposeEntryActivityandComposeEntryFragment.
private fun setListeners() {
with(binding) {
btFragment.setOnClickListener {
startActivity(FragmentActivity.create(this@MainActivity))
}
btScreenA.setOnClickListener {
startComposeEntryActivity(FeatureARoutes.ScreenA("Activity"))
}
btScreenB.setOnClickListener {
startComposeEntryActivity(FeatureARoutes.ScreenB)
}
btScreenC.setOnClickListener {
startComposeEntryActivity(FeatureARoutes.ScreenC)
}
btScreenD.setOnClickListener {
startComposeEntryActivity(FeatureBRoutes.ScreenD)
}
btScreenE.setOnClickListener {
startComposeEntryActivity(FeatureBRoutes.ScreenE)
}
btScreenF.setOnClickListener {
startComposeEntryActivity(FeatureBRoutes.ScreenF)
}
}
}
private fun startComposeEntryActivity(route: NavRoute) {
startActivity(ComposeEntryActivity.create(this, route))
}private fun setListeners() {
binding.btScreenA.setOnClickListener {
navigate(FeatureARoutes.ScreenA("Fragment"))
}
binding.btScreenB.setOnClickListener {
navigate(FeatureARoutes.ScreenB)
}
binding.btScreenC.setOnClickListener {
navigate(FeatureARoutes.ScreenC)
}
binding.btScreenD.setOnClickListener {
navigate(FeatureBRoutes.ScreenD)
}
binding.btScreenE.setOnClickListener {
navigate(FeatureBRoutes.ScreenE)
}
binding.btScreenF.setOnClickListener {
navigate(FeatureBRoutes.ScreenF)
}
}
private fun navigate(destination: NavRoute) {
ComposeEntryFragment.setRoute(destination)
findNavController().navigate(R.id.action_FirstFragment_to_composeEntryFragment)
}Once the Activity or Fragment is initiated, navigation continues using Compose and the navigation-compose library.
project
|- app
|- core
| |- common
| |- ui
|- compose
|- navigation
|- featureA
| |- navigation
| |- routes
| |- presentation
|- featureB
|- navigation
|- routes
|- presentation
This project demonstrates a great integration of Jetpack Compose into a legacy Android application. By leveraging navigation-compose and generic entry points such as Activity and Fragment, it enables flexible navigation throughout the app, providing a robust foundation for modernizing legacy codebases.
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