Reading file in assets folder in Kotlin

Question

I have a two-dimensional array of objects that I store in a file in the Assets folder of an Android Studio project. The file is serialized and named "maindata.conv"

Reading the file in Java is a breeze:

static public Object[][] mainTable = null; ObjectInputStream instream = new ObjectInputStream(getAssets().open("maindata.Conv")); mainTable = (Object[][]) instream.readObject();

But when I translate the code to Kotlin, the translated code does not work:

val instream = ObjectInputStream(assets.open("maindata.Conv")) MainActivity.mainTable = instream.readObject() as Array<Array<Any?>?>

The word "open" is flagged in red as "unresolved". Nothing I try to import works. How do I read a raw file in Kotlin from the Assets folder? Please help.

try assets. `open` instead of assets.open as open is a Kotlin keyword. — dan1st
– dan1st, Commented Oct 25, 2021 at 22:38
In Kotlin assets is just a shorthand for getAssets() which is a method on a Context - so if you call that inside an Activity it will just work. The Java code is the same so you must be calling it from a different place in the Kotlin version? — cactustictacs
– cactustictacs, Commented Oct 25, 2021 at 22:40

neelshenning · Accepted Answer · 2021-10-25 22:38:02Z

0

Thanks but I found the root of my problem. I was trying to execute the Kotlin code from within a Java project. When I created a Kotlin project, the code works just fine. My guess is that it may have something to do with the context of the activity, but I am not 100% sure.

answered Oct 25, 2021 at 22:38

neelshenning

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2 Comments

cactustictacs Over a year ago

You can mix and match Kotlin and Java in the same project - you just weren't calling assets on a Context (e.g. inside an activity instance). If you're getting a red underline it's because assets isn't a recognised property on whatever this is in your scope

neelshenning Over a year ago

Correct! Thanks! I'm still getting to know Kotlin.

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