CODEWITHSUNDEEP
androidkotlin
FaisalAhmed
FaisalAhmed

Reputation: 3651

Required Nothing error while defining null local variable and setting it later in method

I have defined variable which is null but later on based on view.tag object type i have to set it.But it say Required Nothing found RequestCenterDetails. Below is how i am trying to do this

 holder?.addressIcon?.setOnClickListener {

        val tagObject = holder.institutecardView.getTag(R.id.item_institute_cardview)
        var center=null

        if(tagObject is RequestCenterDetails)
        {
            Log.d("location","-------------TEST----------- its a RequestCenter")
            center=tagObject as RequestCenterDetails // over here it say "Required Nothing found RequestCenterDetails"
        }
        else if(tagObject is Center)
        {
            Log.d("location","-------------TEST----------- its a Center")
        }

Problem is that i have to take same action based on there field value but both object has different field names. Is there any better way to do this. I am new to kotlin.

Upvotes: 1

Views: 543

Answers (3)

ruX
ruX

Reputation: 7472

You just need to specify type as it's not clear to the compiler, I'd recommend you to put the highest possible common possible type in hierarchy(for both RequestCenterDetails and Center) , or just Any if you're okay to accept any type:

var center: Any = null

or

var center: CommonBaseClass = null

Upvotes: 0

fweigl
fweigl

Reputation: 22038

If you know center will be RequestCenterDetails, do 

var center: RequestCenterDetails? = null

If center can also be of another type, do 

 var center: Any? = null

A more concise version of what you're doing would be: 

var center: RequestCenterdetails? = tagObject as? RequestCenterDetails

which assigns center the value of tagObject if tagObject is RequestRecenterDetails, else assigns it null.

Upvotes: 4

guenhter
guenhter

Reputation: 12177

The reason is, that your variable center has the type Nothing?. You can change this by saying:

var center: Any? = null

But this is not advisable to work with such a generic type.

Upvotes: 1

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