How can I use Hash map from firebase database in android-CodePudding

val usersref = RTDBref.child("users")
    
    usersref.get().addOnSuccessListener { datasnapshot ->
        val datas = datasnapshot.value
        Log.i("datas", datas.toString()) //it returns hash map

        val id = datas.get("Id") //can't use , redline here
    }

datasnapshot.value returns {Id=userId, uid=uid}. It's a hash map.

So I wanna use val id = datas.get("Id") to get data from a hash map,

But I can't use it because val datas is Type of Any? before retrive data from firebase database.

Is there any way to use get() method to val datas please?..

CodePudding user response：

Use a cast.

(datas as? Map)?.get("Id")

This will tell the compiler to treat it as a map. If data is not a map, it will set datasMap to null, and the ?. operator will make the entire statement return null in that case.