How to Serialized my class objects using kotlin?

Question

i have fragment and i need to pass my values Constructor to OncretaeView() methods so i receive my values in constructor and tr to convert my objects to serialized one but it does not convert. Here is my code. Please guide me how to Serialize and deserialize my objects . Thanks in advance

import java.io.Serializable

class SendingFragment: Fragment(),Serializable {
companion object {
        /**
         * new instance pattern for fragment
         */
        @JvmStatic
        fun newInstance(myObject: List<TransactionEntity>?, cc: Context, appDatabase: AppDatabase, networkDefinitionProvider: NetworkDefinitionProvider, incoming: TransactionAdapterDirection): SendingFragment {

            val gson = Gson()
            val gson1 = GsonBuilder().create()
            val model = myObject as List<TransactionEntity>
            val IT = gson.toJson(model)
            System.out.println("json representation :" + IT)

            val bo = ByteArrayOutputStream()
            val so = ObjectOutputStream(bo)
            so.writeObject(appDatabase)
            so.flush()
            val serializedObject = String(Base64.encode(bo.toByteArray()))

            val bundle = Bundle()
            bundle.putString("bundleValue", IT)
            bundle.putSerializable("serializedObject",serializedObject)
            val sendFragament: SendingFragment = SendingFragment()
            sendFragament.setArguments(bundle)
            return sendFragament
        }
    }

    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {

        val mFragserializedObject = arguments!!.getSerializable("serializedObject")
        System.out.println( "json serializedObject" + mFragserializedObject)
    }
}

Appdatabase.kt

@Database(entities = {AddressBookEntry.class, Token.class, Balance.class, TransactionEntity.class}, version = 1)
@TypeConverters({RoomTypeConverters.class})
public abstract class AppDatabase extends RoomDatabase {

    public abstract AddressBookDAO getAddressBook();

    public abstract TokenDAO getTokens();

    public abstract TransactionDAO getTransactions();

    public abstract BalanceDAO getBalances();
}

UPDATE

class BeanDemo : Serializable {

    var MyAppDatabase: AppDatabase ? = null

    constructor() {

    }

    //secoutry constructor

    constructor(appDatabase: AppDatabase){
        this. MyAppDatabase =  appDatabase
        Log.d("appDatabase : Bean", "appDatabase$appDatabase")
    }

    //getter/setter methods

    fun getName(): AppDatabase? {
        Log.d("appDatabase : getName", "appDatabase$MyAppDatabase")
        return MyAppDatabase
    }

    fun setName(NEWAPPDB: AppDatabase) {
        Log.d("appDatabase : NEWAPPDB", "appDatabase$NEWAPPDB")
        MyAppDatabase = NEWAPPDB
    }
}

**myfragent.kt**



 fun newInstance(myObject: List<TransactionEntity>?, cc: Context, appDatabase: AppDatabase, networkDefinitionProvider: NetworkDefinitionProvider, incoming: TransactionAdapterDirection): SendingFragment {

                val gson = Gson()
                val gson1 = GsonBuilder().create()
                val model = myObject as List<TransactionEntity>
                val IT = gson.toJson(model)
    //             Here
                val sampleVar = BeanDemo(appDatabase)
                sampleVar.setName(appDatabase)
 val bundle = Bundle()
            bundle.putString("bundleValue", IT)
            bundle.putSerializable("serializedObject",sampleVar)
            val sendFragament: SendingFragment = SendingFragment()
            sendFragament.setArguments(bundle)
            return sendFragament

override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {



        val bundle = arguments
        val obj = bundle!!.getSerializable("serializedObject") as BeanDemo
        val name = obj.getName()

        }

But val obj = is null, in setter method to hold the value but does not return it.

Answer 1

When you create your Model/POJO class, then extend the class with Serializable.

Example-

class JsonData : Serializable {

    @SerializedName("hasPreviousData")
    var hasPreviousData: Boolean = false

    @SerializedName("dataList")
    var dataList: ArrayList<DataList>? = null

    inner class DataList : Serializable {
        @SerializedName("id")
        var id: String? = null
        @SerializedName("createdAt")
        var createdAt: String? = null
        @SerializedName("name")
        var name: String? = null
    }
}