How to pass and get value from fragment and activity

Here is the Android Studio proposed solution (= when you create a Blank-Fragment with File -> New -> Fragment -> Fragment(Blank) and you check "include fragment factory methods").

Put this in your Fragment:

class MyFragment: Fragment {

...

    companion object {

            @JvmStatic
            fun newInstance(isMyBoolean: Boolean) = MyFragment().apply {
                arguments = Bundle().apply {
                    putBoolean("REPLACE WITH A STRING CONSTANT", isMyBoolean)
                }
            }
     }
}

.apply is a nice trick to set data when an object is created, or as they state here:

Calls the specified function [block] with this value as its receiver and returns this value.

Then in your Activity or Fragment do:

val fragment = MyFragment.newInstance(false)
... // transaction stuff happening here

and read the Arguments in your Fragment such as:

private var isMyBoolean = false

override fun onAttach(context: Context?) {
    super.onAttach(context)
    arguments?.getBoolean("REPLACE WITH A STRING CONSTANT")?.let {
        isMyBoolean = it
    }
}

Enjoy the magic of Kotlin!

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)

use this to send arguments to fragment

fun newInstance(index: Int): MyFragment {
    val f = MyFragment ()
    // Pass index input as an argument.
    val args = Bundle()
    args.putInt("index", index)
    f.setArguments(args)
    return f
}

And get those arguments like this

val args = arguments
val index = args.getInt("index", 0)

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)

To pass and get value from fragment and activity,

val mFragment = Fragment()
val mArgs = Bundle()
mArgs.putInt("Key", value)
mFragment.setArguments(mArgs)

Use this piece of code in your second Activity/Fragment to get your values.

var args = getArguments()
var index = args.getInt("Key", 0)

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))
    }
}

In Kotlin, I can create Fragments and Passing values to another fragment by,

1.First Fragment in which put String.
`

   val storedVerificationId:String = "verificationId"                                                                    
   val fragmentTransaction = fragmentManager?.beginTransaction()
                val bundle = Bundle().apply {
                    putString("storedVerificationId",storedVerificationId) //string and value.
                }

                val fragInfo = otpFragment() //otpFragment is Another Fragment name
                fragInfo.arguments = bundle //bundle in which values stored
                fragmentTransaction!!.replace(R.id.myDrawerlayout,fragInfo) //replace in main activity 
                fragmentTransaction.commit()

`

2.Second Fragment In which getString.

val verificationId = this.arguments?.getString("storedVerificationId")