How to send MutableMap from activity to another with intent

Question

I have mutable Map as private var optionsList: MutableMap<String, List<String>> = mutableMapOf() and i need to send it to another activity , i used this :

        val optionsIntent = Intent(this@MainActivity, OptionsActivity::class.java)
        optionsIntent.putExtra(
            "optionsLi",optionsList)
        startActivity(optionsIntent)

And it gives me an error in putExtra, but I can't find anything that is like putMap or something to use.

[Convert Map to Bundle in android](https://stackoverflow.com/a/37470356/3290339) — Onik, Dec 27 '19 at 17:52

Md. Asaduzzaman · Accepted Answer · 2019-12-27T17:49:32.333

8

Use

private var optionsList: HashMap<String, List<String>> = hashMapOf()

Instead of

private var optionsList: MutableMap<String, List<String>> = mutableMapOf()

As HashMap implements the Serializable interface, which makes it easy to add it to an intent

edited Dec 27 '19 at 17:49

answered Dec 27 '19 at 17:47

Md. Asaduzzaman

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@Onik, In Kotlin `HashMap` is typealias which actually point to `java.util.HashMap`. Here is the implementation: `public actual typealias HashMap = java.util.HashMap` – Md. Asaduzzaman Dec 27 '19 at 17:55
Actually `LinkedHashMap extends MutableMap` – Md. Asaduzzaman Dec 27 '19 at 17:58

How to send MutableMap from activity to another with intent

1 Answers1