Navigation Component 実践編

054312bb8749ab2405c3c5364bc1be1e?s=47 yoppie
December 03, 2019

Navigation Component 実践編

054312bb8749ab2405c3c5364bc1be1e?s=128

yoppie

December 03, 2019
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  1. 4.
  2. 9.
  3. 13.

    4IBSFE7JFX.PEFMͷྫ class SharedViewModel : ViewModel(){ val fragmentType = MutableLiveData<FragmentType>().apply {

    this.value = FragmentType.FIRST } } enum class FragmentType(val type: String) { FIRST("first"), SECOND("second"), THIRD("third"), FOURTH("fourth") }
  4. 14.

    "DUJWJUZͰ0CTFSWF val sharedViewModel = ViewModelProviders.of(this).get(SharedViewModel::class.java) sharedViewModel.fragmentType.observe(this, Observer { value ->

    value?.let { Snackbar.make( findViewById(android.R.id.content), it.type, Snackbar.LENGTH_SHORT ).show() } }) 4IBSFE7JFX.PEFMͷGSBHNFOU5ZQF͕มߋ͞Εͨ࣌ʹ 4OBDLCBS͕දࣔ͞ΕΔ
  5. 21.

    binding.toolbar .navigationClicks() .filter { navController.currentDestination != null } .subscribe {

    when (navController.currentDestination!!.id) { R.id.homeFragment -> finish() R.id.secondFragment -> navController.navigate( SecondFragmentDirections.homeToFirst() ) } } navController = findNavController(R.id.container_fragment) 'SBHNFOU͝ͱʹ
 5PPMCBSͷॲཧΛ෼ذ
  6. 22.

    navController.addOnDestinationChangedListener { _, destination, _ -> when (destination.id) { R.id.firstFragment

    -> binding.toolbarButton.visibility = View.GONE R.id.secondFragment -> binding.toolbarButton.visibility = View.VISIBLE } } 'SBHNFOUؒͷը໘ભҠ࣌ ը໘ભҠ࣌ʹ5PPMCBSʹ͋Δ#VUUPOͷWJTJWJMJUZΛมߋ
  7. 27.

    @Navigator.Name("custom_fragment") class CustomNavigator( private val context: Context, private val manager:

    FragmentManager, private val containerId: Int ) : FragmentNavigator(context, manager, containerId) { @Suppress("DEPRECATION") override fun navigate( destination: Destination, args: Bundle?, navOptions: NavOptions?, navigatorExtras: Navigator.Extras? ): NavDestination? { // ... } }
  8. 28.

    if (manager.isStateSaved) { return null } var className = destination.className

    if (className[0] == '.') { className = context.packageName + className } val tag = destination.id.toString() val transaction = manager.beginTransaction() val currentFragment = manager.primaryNavigationFragment if (currentFragment != null) { transaction.hide(currentFragment) } var fragment = manager.findFragmentByTag(tag) if (fragment == null) { fragment = instantiateFragment(context, manager, className, args) transaction.add(containerId, fragment, tag) } fragment.arguments = args transaction.show(fragment) transaction.setPrimaryNavigationFragment(fragment) transaction.commit() return destination Ξχϝʔγϣϯͱ
 #BDL4UBDLपΓͷ ॲཧ͸ল͍͍ͯ·͢
  9. 29.

    class CustomNavHostFragment : NavHostFragment() { override fun createFragmentNavigator( ): Navigator<out

    FragmentNavigator.Destination> { return CustomNavigator(requireContext(), childFragmentManager, id) } } /BW)PTU'SBHNFOUͷDSFBUF'SBHNFOU/BWJHBUPS ͷ
 ໭Γ஋͕'SBHNFOU/BWJHBUPSͳͷͰܧঝͨ͠ $VTUPN/BW)PTU'SBHNFOUΛ࡞੒্͠ॻ͖
  10. 31.

    <fragment android:id="@+id/bottom_navigation_view_fragment" android:name="hoge.navigation.CustomNavHostFragment" android:layout_width="match_parent" android:layout_height="wrap_content" app:defaultNavHost="true" app:layout_constraintBottom_toTopOf="@id/bottom_navigation_view" app:layout_constraintTop_toBottomOf="@+id/toolbar" app:navGraph="@navigation/navigation" />

    <com.google.android.material.bottomnavigation.BottomNavigationView android:id="@+id/bottom_navigation_view" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="?android:attr/windowBackground" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" app:menu="@menu/bottom_navigation_menu" /> BOESPJEYOBWJHBUJPOGSBHNFOU/BW)PTU'SBHNFOU Ͱ͸ͳࣗ͘࡞ͨ͠$VTUPN/BW)PTU'SBHNFOUΛࢦఆ