how to read Int arraylist in parcelable in android

Question

I am making a data class for Parcelable. but unable to find out a solution that, how to read integer ArrayList in Parcelable class in kotlin. I know about String, but I face a problem in the Int type ArrayList.

var priceDetail: ArrayList<Int?>?,

for more detail see this,

    data class PostCardsListData(
        var arrDescriptionsTags: ArrayList<String?>?,
        var priceDetail: ArrayList<Int?>?,
..........

: Parcelable {
    constructor(parcel: Parcel) : this(
        parcel.createStringArrayList(), // i know about string
        //but how to read this Integer arraylist

this is my full data class code

import android.os.Parcel
import android.os.Parcelable
data class PostCardsListData(
    var arrDescriptionsTags: ArrayList<String?>?,
    var priceDetail: ArrayList<Int?>?,

) : Parcelable {
    constructor(parcel: Parcel) : this(
        parcel.createStringArrayList(),
        parcel.//describe me what i will write here

    )

    override fun writeToParcel(parcel: Parcel, flags: Int) {
        parcel.writeStringList(arrDescriptionsTags)
        parcel.write//describe me what i will write here
    }

    override fun describeContents(): Int {
        return 0
    }

    companion object CREATOR : Parcelable.Creator<PostCardsListData> {
        override fun createFromParcel(parcel: Parcel): PostCardsListData {
            return PostCardsListData(parcel)
        }

        override fun newArray(size: Int): Array<PostCardsListData?> {
            return arrayOfNulls(size)
        }
    }
}

its not working Type mismatch. Required: kotlin.collections.ArrayList? /* = java.util.ArrayList? */ Found: Serializable? — Shirsh Shukla, Jan 13 '21 at 05:12
yea because you should type cast it, `parcel.readSerializable() as required_type` — Sekiro, Jan 13 '21 at 05:13
ok, so please take me direct answer how to read this Int arraylist, like i write for string arraylist. parcel.createStringArrayList(), — Shirsh Shukla, Jan 13 '21 at 05:16
`parcel.readSerializable() as ArrayList?`,check if this solves the issue — Sekiro, Jan 13 '21 at 05:18
i also try this.but its takes issue Unchecked cast: Serializable? to kotlin.collections.ArrayList? /* = java.util.ArrayList? */ — Shirsh Shukla, Jan 13 '21 at 05:24
Let us [continue this discussion in chat](https://chat.stackoverflow.com/rooms/227247/discussion-between-rcs-and-shirsh-shukla). — Sekiro, Jan 13 '21 at 05:24

Vatsal kesarwani · Accepted Answer · 2021-01-12T15:37:08.910

1

So to create a parcelable class.

Firstly, Add add plugin to the gradle

plugins {
    .
    .
    id 'kotlin-parcelize'
}

Then, create a class and use annotations to parcelize the data

@Parcelize
class PostCardsListData(

    @SerializedName("arrDescriptionsTags")
    var arrDescriptionsTags: ArrayList<String>? = null,

    @SerializedName("priceDetail")
    var priceDetail: ArrayList<Int?>? = null

) : Parcelable

To read/write data you just need to create an object of this class and use the dot operator to access the list.

In the activity/fragment/viewModel class

private var listData = PostCardsListData()

//read data

private var priceList : ArrayList<Int> = ArrayList()
if(listData.priceDetail != null){
    priceList.addAll(listData.priceDetail)
}

edited Jan 12 '21 at 15:37

answered Jan 12 '21 at 15:11

Vatsal kesarwani

664
8
23

Ok,but main problem is how to read integer array list.see my question – Shirsh Shukla Jan 12 '21 at 15:16
okay, I have updated the answer please have a look. – Vatsal kesarwani Jan 12 '21 at 15:38
please take answer in kotlin, also take direct suggestion for read arraylist, like i read string arraylist parcel.createStringArrayList(), // i know about string – Shirsh Shukla Jan 13 '21 at 05:32

score 0 · Answer 2 · answered Jan 12 '21 at 16:12

0

public void writeToParcel(Parcel out, int flags) {
   out.writeList(priceDetail);
}

private PostCardsListData(Parcel in) {
   priceDetail = new ArrayList<>();
   in.readList(priceDetail, Integer.class.getClassLoader());
}

or for custom classes use

public void writeToParcel(Parcel out, int flags) {
   out.writeTypedList(listCustomClass);
}

private PostCardsListData(Parcel in) {
   listCustomClass = in.createTypedArrayList(CustomClass.CREATOR);
}

answered Jan 12 '21 at 16:12

saeedata

901
6
14

please take answer in kotlin, also take direct suggestion for read arraylist, like i read string arraylist parcel.createStringArrayList(), // i know about string – Shirsh Shukla Jan 13 '21 at 05:32

how to read Int arraylist in parcelable in android

2 Answers2