AdapterItem

class AdapterItem(val context: Context, val userList: List): RecyclerView.Adapter<AdapterItem.ViewHolder>() {

class ViewHolder(itemView:View):RecyclerView.ViewHolder(itemView){

var numeLista: TextView var caloriiLista: TextView

    init{
        numeLista=itemView.numeLista
        caloriiLista=itemView.caloriiLista
    }

}

override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
   var itemView = LayoutInflater.from(context).inflate(R.layout.row_items, parent, false)
    return ViewHolder(itemView)

}

override fun onBindViewHolder(holder: ViewHolder, position: Int) {
    holder.numeLista.text=userList[position].foodItems.get(0).foodName
    holder.caloriiLista.text=userList[position].foodItems.get(0).calories.toString()

}

override fun getItemCount(): Int {
    return userList.size
}

}

InformationFragment:

const val BASE_URL= "https://raw.githubusercontent.com/terrenjpeterson/caloriecounter/master/src/data/"

class InformationFragment : Fragment() {

private var binding: FragmentInformationBinding?   =null
private  val sharedViewModel: SharedViewModel by activityViewModels()

lateinit var adapterItem: AdapterItem
lateinit var linearLayoutManager: LinearLayoutManager



override fun onCreateView(
    inflater: LayoutInflater, container: ViewGroup?,
    savedInstanceState: Bundle?
): View? {

    recyclerview_lista.setHasFixedSize(true)
    linearLayoutManager = LinearLayoutManager(this.context)
   recyclerview_lista.layoutManager=linearLayoutManager

    getMyData()




    val fragmentBinding = FragmentInformationBinding.inflate(inflater, container, false)
    binding= fragmentBinding
    return fragmentBinding.root
}



override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    super.onViewCreated(view, savedInstanceState)

    binding?.apply {
        viewModel= sharedViewModel
        informationFragment=this@InformationFragment
        lifecycleOwner= viewLifecycleOwner
    }

}
    private fun getMyData() {
    val retrofitBuilder= Retrofit.Builder()
        .addConverterFactory(GsonConverterFactory.create())
        .baseUrl(BASE_URL)
        .build()
        .create(ApiInterface::class.java)

    val retrofitData= retrofitBuilder.getData()

    retrofitData.enqueue(object : Callback<List<MyDataItem>?> {
        override fun onResponse(
            call: Call<List<MyDataItem>?>,
            response: Response<List<MyDataItem>?>
        ) {
            val responseBody= response.body()!!
            adapterItem= AdapterItem(,responseBody ) // ** here what context should I pass ???? ... I cant use baseContext**
            adapterItem.notifyDataSetChanged() 
            recyclerview_list.adapter=adapterItem



        }


        override fun onFailure(call: Call<List<MyDataItem>?>, t: Throwable) {
           Log.d( "informationFragment" , "onFailure: "   t.message)
        }
    })
}

}

CodePudding user response：

There is no need to pass the context as an arg you can use the context of the parent passed to your viewHolder

you shouldn't pass context. change:

class AdapterItem(val context: Context, val userList: List):

to:

class AdapterItem(val userList: List):

and

var itemView = LayoutInflater.from(context).inflate(R.layout.row_items, parent, false)

to:

var itemView = LayoutInflater.from(parent.context).inflate(R.layout.row_items, parent, false)

Be careful if you want to pass context to the adapter, if you assigned the view context to a variable in your adapter, it probably would lead to a memory leak. Consider using WeakReference to avoid that if happens.

CodePudding user response：

You can use the context of view parameter of your viewholder.

CodePudding user response：

My app still keep crashing when it reaches the InformationFragment

class AdapterItem( val userList: List): RecyclerView.Adapter<AdapterItem.ViewHolder>() {

class ViewHolder(itemView: View):RecyclerView.ViewHolder(itemView){
    var numeLista: TextView
    var caloriiLista: TextView
    init{
        numeLista=itemView.numeLista
        caloriiLista=itemView.caloriiLista
    }

}

override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
    var itemView = LayoutInflater.from(parent.context).inflate(R.layout.row_items, parent, false)

    return ViewHolder(itemView)

}

override fun onBindViewHolder(holder: ViewHolder, position: Int) {
    holder.numeLista.text=userList[position].foodItems.get(0).foodName
    holder.caloriiLista.text=userList[position].foodItems.get(0).calories.toString()

}

override fun getItemCount(): Int {
    return userList.size
}

}

const val BASE_URL= "https://raw.githubusercontent.com/terrenjpeterson/caloriecounter/master/src/data/"

class InformationFragment : Fragment() {

private var binding: FragmentInformationBinding? = null
private val sharedViewModel: SharedViewModel by activityViewModels()

lateinit var adapterItem: AdapterItem
lateinit var linearLayoutManager: LinearLayoutManager


override fun onCreateView(
    inflater: LayoutInflater, container: ViewGroup?,
    savedInstanceState: Bundle?
): View? {

    recyclerview_lista.setHasFixedSize(true)
    linearLayoutManager = LinearLayoutManager(this.context)
    recyclerview_lista.layoutManager = linearLayoutManager

    getMyData()


    val fragmentBinding = FragmentInformationBinding.inflate(inflater, container, false)
    binding = fragmentBinding
    return fragmentBinding.root
}


override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    super.onViewCreated(view, savedInstanceState)

    binding?.apply {
        viewModel = sharedViewModel
        informationFragment = this@InformationFragment
        lifecycleOwner = viewLifecycleOwner
    }

}

private fun getMyData() {
    val retrofitBuilder = Retrofit.Builder()
        .addConverterFactory(GsonConverterFactory.create())
        .baseUrl(BASE_URL)
        .build()
        .create(ApiInterface::class.java)

    val retrofitData = retrofitBuilder.getData()

    retrofitData.enqueue(object : Callback<List<MyDataItem>?> {
        override fun onResponse(
            call: Call<List<MyDataItem>?>,
            response: Response<List<MyDataItem>?>
        ) {
            val responseBody = response.body()!!
            adapterItem = AdapterItem(responseBody)
            adapterItem.notifyDataSetChanged()
            recyclerview_lista.adapter=adapterItem
        }


        override fun onFailure(call: Call<List<MyDataItem>?>, t: Throwable) {
             d("informationFragment", "onFailure: "   t.message)
        }
    })
}

}