How to get a List<Bitmap> from asset folder in Kotlin - arraylist

Question

How to init a list of Bitmaps from asset folder. I have a folder in assets called "images" with multiple PNG images:
E:\Computer Projects\Android\TaskProgress\app\src\main\assets\images
My code:
class Icons(val context: Context)
{
companion object
{
lateinit var iconList : MutableList<Bitmap>
}
init
{
iconList = ???
}

Answer 1

I implemented this by the following:
class Icons(var context: Context)
{
init
{
val assetManager = context.assets
try
{
var `is`: InputStream
var files = assetManager.list("boys")
for(i in files!!.indices)
{
`is` = assetManager.open("boys/" + files[i])
val bitmap = BitmapFactory.decodeStream(`is`)
iconListBoys.add(i, bitmap)
}
files = assetManager.list("girls")
for(i in files!!.indices)
{
`is` = assetManager.open("girls/" + files[i])
val bitmap = BitmapFactory.decodeStream(`is`)
iconListGirls.add(i, bitmap)
}
}
catch (e: IOException)
{
e.printStackTrace()
}
}
companion object
{
var iconListBoys: ArrayList<Bitmap> = ArrayList()
var iconListGirls: ArrayList<Bitmap> = ArrayList()
}
}

Answer 2

I am not in Android Environment right now, so below code might not work.
Please leave a comment if so.
You need to have Context to work with assets.
So rather than initializing iconList with declaration,
I'll add load() method to load the list of assets.
Icons class
Icons class will look like below if you add load() method.
class Icons {
companion object {
// initialize with empty list
var iconList = listOf<Bitmap>()
fun load(context: Context) {
// This is where we will load assets
}
}
}
load() method
First in load() method, we will get list of file names in assets/list.
context.getAssets() will return AssetManager object.
AssetManager.list(subPath) will return all files in subPath.
use map() to convert list of file name String to list of Bitmap.
AssetManager.open(filePath) to open InputStream from file.
BitmapFactory.decodeStream(stream) to create Bitmap from InputStream
With those, it will be
val am = context.getAssets()
iconList = am.list("images").map {
val inputStream = am.open("images/$it")
return BitmapFactory.decodeStream(inputStream)
}