Passing values from one fragment to another - android-fragments

Question

I'm working in Kotlin and using retrofit. I have a recycler view, which consists of cards. Each card has a typeName and an image associated to it which for now I have added statically using dataclass. Now, I need to pass the typeName only from the CategoryFragment to the LocationFragment once the user clicks on a particular card. And at the LocationFragment I want to check the latitude, longitude and typeName from the database if it already exists.
Here's my code for the dataclass of Category:
data class Category_dataclass ( val category_image : Int , val typeName: String)
Here's my code for the CategoryFragment:
package com.example.atry.MakeComplaint
import android.content.Context
import android.net.Uri
import android.os.Bundle
import androidx.fragment.app.Fragment
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.recyclerview.widget.GridLayoutManager
import androidx.recyclerview.widget.RecyclerView
import com.example.atry.History.Complaints
import com.example.atry.History.MyComplainRecyclerViewAdapter
import com.example.atry.R
import kotlinx.android.synthetic.main.existing_complaint_popup.*
class CategoryFragment : Fragment() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
arguments?.let {
}
}
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
// Inflate the layout for this fragment
val v = inflater.inflate(R.layout.fragment_category, container, false)
val recyclerView = v.findViewById(R.id.category_list) as RecyclerView
recyclerView.apply {
layoutManager = GridLayoutManager(context!!, 2)
}
//creating an arraylist to store category using the data class user
val category = ArrayList<Category_dataclass>()
//adding some dummy data to the list of categories
category.add(Category_dataclass((R.drawable.trash) , "Water"))
category.add(Category_dataclass((R.drawable.fire) , "Sewerage"))
category.add(Category_dataclass((R.drawable.dustbin) , "load"))
//creating our adapter
val adapter = CategoryRecyclerViewAdapter(category)
//now adding the adapter to recyclerview
recyclerView.adapter = adapter
// Inflate the layout for this fragment
return v
}
}
Here's the CategoryRecyclerViewAdapter:
package com.example.atry.MakeComplaint
import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.ImageView
import android.widget.TextView
import androidx.appcompat.app.AppCompatActivity
import androidx.recyclerview.widget.RecyclerView
import com.example.atry.History.ComplaintDetailsFragment
import com.example.atry.History.Complaints
import com.example.atry.MakeComplaint.Category_dataclass
import com.example.atry.MakeComplaint.CategoryRecyclerViewAdapter
import com.example.atry.R
import java.util.*
import kotlin.collections.ArrayList
class CategoryRecyclerViewAdapter(val categoryList: ArrayList<Category_dataclass>) : RecyclerView.Adapter<CategoryRecyclerViewAdapter.ViewHolder>() {
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): CategoryRecyclerViewAdapter.ViewHolder {
val v = LayoutInflater.from(parent.context).inflate(R.layout.fragment_category_single, parent, false)
return ViewHolder(v)
}
//this method is binding the data on the list
override fun onBindViewHolder(holder: ViewHolder, position: Int) {
holder.bindItems(categoryList[position])
holder.mView.setOnClickListener{view->
val lFragment = LocationFragment()
val oldFragment = CategoryFragment()
val manager = (holder.mView.context as AppCompatActivity).supportFragmentManager
val transaction = manager.beginTransaction()
transaction.replace(
R.id.first_screen_of_makecomplaint,
lFragment
) // give your fragment container id in first parameter
transaction.show(lFragment)
transaction.hide(oldFragment)
transaction.isAddToBackStackAllowed
transaction.addToBackStack(oldFragment.fragmentManager.toString()) // if written, this transaction will be added to backstack
transaction.commit()
}
}
//this method is giving the size of the list
override fun getItemCount(): Int {
return categoryList.size
}
inner class ViewHolder(val mView : View) : RecyclerView.ViewHolder(mView) {
fun bindItems(cat:Category_dataclass) {
val imageViewName = mView.findViewById(R.id.category_image) as ImageView
val textViewtext = mView.findViewById(R.id.category_text) as TextView
imageViewName.setImageResource(cat.category_image)
textViewtext.text = cat.typeName
}
}
}
And this is my retrofit:
//to check existing complaint
#GET("api/existingComplain")
#FormUrlEncoded
fun checkExistingComplain(#Query("typeName") typeName:String,
#Query("longitude") longitude:String,
#Query("latitude") latitude:String):Observable<Observables.checkExistingResult>
I've created and object where i stored the dataclass which will return the following:
data class checkExistingResult(val description:String , val Complain:String)
if the typeName and location already exists in the database I want the description and Complain to be displayed on a material styled dialog.

Answer 1

You can try this:
1st Step:-
val dashboard = "Dashboard"
take variable like this you can take it's name as your fragment name so page name you can check like this MainActivity().dashboard
Now, 2nd Step:-
create one class and write function like this in that class
fun openPage(
activity: Activity,
pagename: String?, model: PaymentDetails
) {
when (pagename) {
MainActivity().dashboard -> {
val mfragment = DashboardFragment()
(activity as MainActivity).fragmentManager.beginTransaction()
.replace(R.id.nav_host, mfragment).commit()
val a = Bundle()
a.putSerializable("model", model)
mfragment.arguments = a
}
}
}
take key value pair as I take my whole model and key is model in my code you can write any thing.
3rd Step:-
Make your model Serializable
4th Step:- When you are adding your values into model add details and add your model for method in which you want to use these values like following
val payment = PaymentDetails(
type,
price,
name,
id,
)
paymentData!!.add(payment)
CustomMethods().openPagePaymentDetails(
activity!!,
MainActivity().sessionPaymentFragment, payment
)
5th Step:-
Declare and initialise your object with type of your model like following:
//Declare
private var model: PaymentDetails? = null
//initialise
model = arguments!!.getSerializable("model") as PaymentDetails?
And now finally you can access value of previous fragment into your next fragment like this,
var type: String
type = model!!.type
Note:- please do no forgot to make your model class Serializable
Hope so it will help you.