Develop Reference

How can I pass a mutable list of type custom object between fragments?

I am trying to pass a mutable list of custom object type SavedRecipes from one fragment to be displayed in a recyclerview on another fragment, however I am struggling to work out how to pass this list.
I have the code below:
RecipePage.kt
class RecipePage : Fragment() {
var allSavedRecipes = mutableListOf<SavedRecipes>()
lateinit var savedRecipe: SavedRecipes
lateinit var id: String
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
// Inflate the layout for this fragment
val view = inflater.inflate(R.layout.fragment_recipe_page, container, false)
val args = this.arguments
id = args?.get("id").toString()
view.addToCollection.setOnClickListener {
saveRecipe()
val bundle = Bundle()
bundle.putStringArrayList("allsaved", allSavedRecipes)
val savedRecipePage = SavedRecipesFragment()
savedRecipePage.arguments = bundle
}
return view
}
The line
bundle.putStringArrayList("allsaved", allSavedRecipes)
is where I want to be passing the list of allSavedRecipes to the second fragment.
How can I accomplish this?

Kotlin interface, sending data between two fragments

I am looking to send a string from FragmentA to FragmentDialog by means of an interface Communicator through my Main Activity (which automatically opens FragmentDialog). Some code to illustrate what I have:
class FragmentA: Fragment() {
private lateinit var communicator: Communicator
override fun onCreateView(
inflater: LayoutInflater,
container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
val view = inflater.inflate(R.layout.fragment_A, container, false)
val title = "My Title"
button.setOnClickListener { communicator.passData(title) }
return view
}
}
class FragmentDialog : DialogFragment() {
var title: String? = ""
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
}
override fun onCreateView(
inflater: LayoutInflater,
container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
val view = inflater.inflate(R.layout.dialog, container, false)
view.button_close.setOnClickListener { dismiss() }
title = arguments?.getString("title")
view.dialog_title.text = title
return view
}
}
interface Communicator {
fun passData (titleInput: String)
}
and in my Main Activity, which extends the interface:
private val fragmentDialog = FragmentDialog()
override fun passData(titleInput: String) {
val bundle = Bundle()
bundle.putString("title", titleInput)
fullScreenDialog.arguments = bundle
val transaction = supportFragmentManager.beginTransaction().add(android.R.id.content, fragmentDialog).addToBackStack(null).commit()
}
When I click the button in FragmentA, I want to send the string title to Communicator, set the XML element with id dialog_title in FragmentDialog and automatically open the fragment. In fact, this works fine. The issue is that my "back button" in FragmentDialog, i.e. view.button_close.setOnClickListener { dismiss() } only works exactly once. If I click button in FragmentA again, FragmentDialog opens fine with the correct title still but button_close no longer dismisses the dialog. What could be causing this? I am not getting any consol errors.

Error during passing data between fragment

Im trying to pass data between two fragments but i have an error with arguments in execution when i launch fullFragment
i updated my code
Can you help me ?
architecture :
ListeFragment (sender) :
class ListeFragment : Fragment() {
companion object {
fun newInstance(s: String) = ListeFragment()
}
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View {
val layout = inflater.inflate(R.layout.liste_fragment, container, false)
val photo1 = layout.findViewById<ImageView>(R.id.imageButton1)
val model = ViewModelProviders.of(this).get(ListeViewModel::class.java)
imageButton1.setOnClickListener {
val newFragment = FullFragment()
val args = Bundle()
args.putString("key1", "data")
newFragment.arguments = args
Navigation.findNavController(imageButton1).navigate(R.id.versFullFragment);
}
FullFragment (receiver):
class FullFragment : Fragment() {
companion object {
fun newInstance() = FullFragment()
}
private lateinit var viewModel: FullViewModel
override fun onCreate( savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
var value1 = getArguments()?.getString("key1")
Log.v("value" , value1.toString())
Toast.makeText(context, value1.toString(), Toast.LENGTH_SHORT).show()
}
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
val layout = inflater.inflate(R.layout.full_fragment, container, false)
return layout
}

I don't know what "newFragment.arguments = args" do because in FullFragment class I don't see any variable with that name, however you have to use "Fragment.setArguments(Bundle)" to set Fragment Arguments from the first one. Then in the Full you will have a correct result from "FullFragment.getArguments()" method.
PS: don't forget that the Context could be NULL in Fragment class and it should be handled in proper way.

Kotlin Android Navigate to a Fragment with OnItemClickListener of a listview

So I Have this one Fragment:
class OrderListFragment : Fragment() {
val language = arrayOf<String>(//Some String Content)
val description = arrayOf<String>( //Some String Content )
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
// Binding object for this fragment and the layout
val binding: FragmentOrderListBinding = DataBindingUtil.inflate(inflater, R.layout.fragment_order_list, container, false)
val myListAdapter = OrderListAdapter((activity as AppCompatActivity),language,description)
binding.listView.adapter = myListAdapter
binding.listView.setOnItemClickListener(){adapterView, view, position, id ->
val itemAtPos = adapterView.getItemAtPosition(position)
val itemIdAtPos = adapterView.getItemIdAtPosition(position)
Navigation.createNavigateOnClickListener(R.id.action_orderListFragment_to_orderDetailFragment)
Toast.makeText((activity as AppCompatActivity), "Click on item at $itemAtPos its item id $itemIdAtPos", Toast.LENGTH_LONG).show()
}
//Return.... i don't know.
return binding.root
}
}
What i want is that when i click one of the listview items, it'll navigate to other fragments using this line.
Navigation.createNavigateOnClickListener(R.id.action_orderListFragment_to_orderDetailFragment)
But it does not do anything. Am i missing something ?

How do I correctly use Kotlin to call a blank fragment from the Home fragment?

class HomeFragment : Fragment() {
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?): View? {
// Inflate the layout for this fragment
val v = inflater.inflate(R.layout.fragment_home, container, false)
val fab = v.findViewById(R.id.fab) as FloatingActionButton
fab.setOnClickListener {
val blankFragment = BlankFragment()
val manager = childFragmentManager
manager.beginTransaction().replace(R.id.frame_container, blankFragment, blankFragment.tag).commit()
// System.out.println("You have reached the floating action button")
}
return v
}
}
Getting a no view found error. I may have issues with the R.id.frame_content but Kotlin doesn't immediately identify all id values...

This may not be the best way and I apologize for the horrible formatting I does this while answer out on my phone and it's hard to get it perfect. Anyways In the activity that holds your fragments, such as MainActivity.kt add...
supportFragmentManager.beginTransaction.add(R.id.fragment_home, HomeFragment.newInstance, "HomeFragment").commit()
In your HomeFragment.kt change the following.
class HomeFragment: Fragment(){
companion object {
fun newInstance(): HomeFragment{
return HomeFragment() }
fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
val view: View = inflater!!.inflate(R.layout.fragment_home, container, false)
val activity = activity
return view
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
val clickListener = View.OnClickListener { view ->
when (view.getId()) {
R.id.fab -> NextFragment()
}
}
fab.setOnClickListener(clickListener)
}
NextFragment(){
val fragManager = activity?.supportFragmentManager
fragManager?.beginTransaction()?.replace(R.id.frame_container, BlankFragment.newInstance(), "blankFragment")?.commit()
}
Make sure you make the same changes to BlankFragment.kt
class BlankFragment: Fragment(){
companion object {
fun newInstance(): BlankFragment{
return BlankFragment() }
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
val view: View = inflater!!.inflate(R.layout.fragment_blank, container, false)
val activity = activity
return view
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
//Do some stuff with your views in BlankFragment here
}
}