WorkManager Data.Builder does not support Parcelable

Question

When you have a big POJO with loads of variables (Booleans, Int, Strings) and you want to use the new Work Manager to start a job. You then create a Data file which gets added t

Answer 1

This solution works without using JSON, and serializes directly to byte array.

package com.andevapps.ontv.extension

import android.os.Parcel
import android.os.Parcelable
import androidx.work.Data
import java.io.*

fun Data.Builder.putParcelable(key: String, parcelable: Parcelable): Data.Builder {
    val parcel = Parcel.obtain()
    try {
        parcelable.writeToParcel(parcel, 0)
        putByteArray(key, parcel.marshall())
    } finally {
        parcel.recycle()
    }
    return this
}

fun Data.Builder.putParcelableList(key: String, list: List): Data.Builder {
    list.forEachIndexed { i, item ->
        putParcelable("$key$i", item)
    }
    return this
}

fun Data.Builder.putSerializable(key: String, serializable: Serializable): Data.Builder {
    ByteArrayOutputStream().use { bos ->
        ObjectOutputStream(bos).use { out ->
            out.writeObject(serializable)
            out.flush()
        }
        putByteArray(key, bos.toByteArray())
    }
    return this
}

@Suppress("UNCHECKED_CAST")
inline fun  Data.getParcelable(key: String): T? {
    val parcel = Parcel.obtain()
    try {
        val bytes = getByteArray(key) ?: return null
        parcel.unmarshall(bytes, 0, bytes.size)
        parcel.setDataPosition(0)
        val creator = T::class.java.getField("CREATOR").get(null) as Parcelable.Creator
        return creator.createFromParcel(parcel)
    } finally {
        parcel.recycle()
    }
}

inline fun  Data.getParcelableList(key: String): MutableList {
    val list = mutableListOf()
    with(keyValueMap) {
        while (containsKey("$key${list.size}")) {
            list.add(getParcelable("$key${list.size}") ?: break)
        }
    }
    return list
}

@Suppress("UNCHECKED_CAST")
fun  Data.getSerializable(key: String): T? {
    val bytes = getByteArray(key) ?: return null
    ByteArrayInputStream(bytes).use { bis ->
        ObjectInputStream(bis).use { ois ->
            return ois.readObject() as T
        }
    }
}

Add proguard rule

-keepclassmembers class * implements android.os.Parcelable {
  public static final android.os.Parcelable$Creator CREATOR;
}