How to pass and get value from fragment and activity

Question

How to pass and get value from fragment and activity?

Answer 1

In one source code I found this version:

class ConfirmPasswordActivity : Activity {

companion object {
    lateinit var person: Person
    fun newIntent(context: Context, person: Person) = run {
        this.person = person
        Intent(context, ConfirmPasswordActivity::class.java)
    }
}
private fun setOnClickListeners() {
    ib_back.setOnClickListener { finish() }
    btn_confirm_password.setOnClickListener {
        onNext(UiEvents.OnBtnConfirmClicked(person))
    }
}

Answer 2

There is the companion object for that (https://kotlinlang.org/docs/reference/object-declarations.html#companion-objects )

Define your fragment as usual, and declare the companion that acts as the static newInstance() equivalent in Java :

class ViewStackListFragment : Fragment() {
  companion object {
        fun newInstance(position: Int): ViewStackListFragment {
            val fragment = ViewStackListFragment()
            val args = Bundle()
            args.putInt("position", position)
            fragment.setArguments(args)
            return fragment
        }
    }
}

And simply call it like in Java :

val fragment = ViewStackListFragment.newInstance(4)

Answer 3

Kotlin, Fragment: for pass

companion object {
    private const val ARGUMENT_ACTION = "ARGUMENT_ACTION"

    fun newInstance(action: Int) : MyFragment{
        return MyFragment().apply {
            arguments = bundleOf(ARGUMENT_ACTION to action)
        }
    }
}

for get

requireArguments().getInt(ARGUMENT_ACTION)