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FragmentNavigation

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FragmentNavigation library will help you to organize navigation logic in you application by using fragments and pretty easy DSL.

Getting started

Create all fragments what you need

class TextFragment : Fragment() {
}

Create factories for these fragments that implement FragmentFactory interface

class TextFragmentFactory(private val text: String) : FragmentFactory {
     override fun create(path: List<String>) = TextFragment.create(text)
}

Create Schema object by using DSL. In this example I create and save it in Application class

class App : Application() {

    lateinit var scheme: Scheme<FragmentFactory>
        private set

    override fun onCreate() {
        super.onCreate()
        scheme = FragmentSchemeBuilder()
                .pager("a1", "b1") {
                    list("b1", "f1") {
                        child("f1", TextFragmentFactory("f1"))
                        child("f2", TextFragmentFactory("f2"))
                    }
                    list("b2", "d1") {
                        child("d1", TextFragmentFactory("d1"))
                        child("d2", TextFragmentFactory("d2"))
                    }
                    pager("b3", "e1") {
                        child("e1", TextFragmentFactory("e1"))
                        child("e2", TextFragmentFactory("e2"))
                    }
                }
    }
}

Implement NavigationFragmentContainer interface in your activity and display schema by using FragmentSchemePlaceholder class.

class MainActivity : AppCompatActivity(), NavigationFragmentContainer {
    override val scheme: Scheme<FragmentFactory>
        get() = app.scheme

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        FragmentSchemePlaceholder(scheme, supportFragmentManager, R.id.placeholder).show()
    }
}

To navigate in schema, add or remove elements you should you saved schema object.