"Null" value while retrieving data from intent in kotlin

Issue

I am passing some value through intent from FirstActivity to MainActivity. But, when I try to retrieve that value from second activity (i.e. MainActivity) I am not able to do so.

FirstActivity

 var i = Intent()
        launcher?.launch(Intent(this, MainActivity::class.java))
        i.putExtra("key", cold)
        startActivity(i)

MainActivity

val initialCold = intent.getStringExtra("key")

Solution

Your problem is in this line launcher?.launch(Intent(this, MainActivity::class.java)) this is another intent, not i and you launched it without the extra key string, so you can't get it in your MainActivity, the right way if you want to launch activity for result

val intent = Intent(this, MainActivity::class.java)
intent.putExtra("key", cold)
launcher?.launch(intent)

Or like this if you want to start the MainActivity without result

val intent = Intent(this, MainActivity::class.java)
startActivity(intent)

Answered By - AmrDeveloper