Android Jetpack Navigation: Custom Action for Back Pressed and Nagivate Up in Fragment
October 2, 2019You should be implementing the following in main activity which enable navigate up.
class MainActivity : AppCompatActivity() {
override fun onSupportNavigateUp(): Boolean {
// Allows NavigationUI to support proper up navigation or the drawer layout
// drawer menu, depending on the situation
// return navController.navigateUp(drawerLayout)
return navController.navigateUp()
}
}
Fragment
class CardFragment : Fragment() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
// enable custom menu toolbar
setHasOptionsMenu(true)
}
override fun onActivityCreated(savedInstanceState: Bundle?) {
super.onActivityCreated(savedInstanceState)
// handle back button
requireActivity().onBackPressedDispatcher.addCallback(this) {
if (viewModel.isEditMode) {
// do something if in edit mode
}
else {
// else, navigate up as usual
findNavController().navigateUp()
}
}
}
override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater) {
// inflate custom menu
inflater.inflate(R.menu.card, menu)
super.onCreateOptionsMenu(menu, inflater)
}
override fun onOptionsItemSelected(item: MenuItem): Boolean {
return when(item.itemId) {
// handle navigateUp
android.R.id.home -> {
requireActivity().onBackPressedDispatcher.onBackPressed()
true
}
else -> super.onOptionsItemSelected(item)
}
}
}
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