MainActivity.kt

class MainActivity : AppCompatActivity() {

    companion object {
        const val QUERY_COMPONENT = "component"

        const val COMPONENT_BUTTON = "button"
    }

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

        ...

        handleIntent(intent.data?.getQueryParameter(QUERY_COMPONENT))
    }

    private fun handleIntent(component: String?) {
        when (component) {
            COMPONENT_BUTTON -> startActivity(Intent(this, ButtonActivity::class.java))
        }
    }
}