RecyclerView item click and open another recyclerview

Question

enter image description hereI have almost 250 patent item which i want to show in a parent recyclerview. After item click of parent recyclerview it will show over hundreds of data under each parent item in another recycler view. How can i do it like this picture.

You need to show in another screen or you want to show this in single screen as shown in the picture? — Mohamed Niyaz

coroutineDispatcher coroutineDispatcher · Accepted Answer · 2020-01-05T17:22:51

I would do it this way. Create an interface:

interface AdapterContract{
  fun onListItemClick(id: String) //whatever the parameter is
}

When you instantiate the Adapter in your Fragment1, you can implement this interface:

class Fragment1 : Fragment(), AdapterContract{
  ...
  //when instantiating the adapter:
  private val adapter: MyAdapter by lazy{
      MyAdapter(this //for the interface)
  }
  //override the method of Adapter contract
}

Your adapters constructor should look like this: MyAdapter(adapterContract: AdapterContract) : ListAdapter<MyAdapter.MyViewHolder>(Diff_Util_SOME_OBJECT)

Than in the adapters ViewHolder:

itemHolder?.setOnClickListener{
 adapterContract.onListItemClick(someId)
}

Now in your override method in Fragment1:

override method onListItemClick(id: String){
  //pass this id to the next opening fragment (like Bundles or navargs)
 //init `Fragment2` which is going to have all items, that belong to `Fragment1` selected item
}

Load the data :)

I hope you are using a database or something. Should work with hard coded data structures as well, but just to be safe :).

RecyclerView item click and open another recyclerview

1 Answers