CODEWITHSUNDEEP
androideventskotlin
Eddi
Eddi

Reputation: 577

Android Kotlin - How do I assign a name function in main activity class to setOnClickListener in another class?

Please check the sample code and comments below,

class MainActivity : AppCompatActivity(), MyListener {
  fun OnViewItemClicked(){
    // do something
  }
}

class AnotherClass() : RecyclerView.Adapter<MyAdapter.ViewHolder>() {
  override fun onBindViewHolder(holder: ViewHolder, position: Int) {
    // how do i set this to OnViewItemClicked declared in class MainActivity?
    holder.itemView.setOnClickListener(OnViewItemClicked);
  }
}

Upvotes: 0

Views: 167

Answers (1)

Santanu Sur
Santanu Sur

Reputation: 11477

Just pass the Listener instance to the adapter:- like :-

val adapter = AnotherClass(this@MainActivity)

Then in adapter

class AnotherClass(private val listener: MainActivity): RecyclerView.Adapter<MyAdapter.ViewHolder>() {
     ....
     ....
     holder.itemView.setOnClickListener {
         listener.OnViewItemClicked()
     }
     ....
 }

Explanation - This is done with the help of kotlin lambda , i.e, equivalent to :-

val clickLambda: (View) -> Unit = {
    listener.OnViewItemClicked()
}

Edit :- Instead of doing this you can directly pass in a lambda of type (View) -> Unit from the activity !

Upvotes: 3

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