有人可以幫助我如何將資料從一個 recyclerview 片段傳輸到另一個 recyclerview 片段嗎？
這是我CartRecyclerAdapter.kt從片段中為我的購物車回收視圖新創建的。的主要思想SubmitItem()是在Itemrecyclerview中接受選中的item。
package com.example.karawapplication
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.Button
import android.widget.ImageView
import android.widget.TextView
import android.widget.Toast
import androidx.recyclerview.widget.RecyclerView
import com.bumptech.glide.Glide
import com.bumptech.glide.request.RequestOptions
import com.example.karawapplication.models.ItemPost
import kotlinx.android.synthetic.main.layout_item_cart_list.view.*
import kotlinx.android.synthetic.main.layout_item_list_item.view.*
class CartRecyclerAdapter : RecyclerView.Adapter<RecyclerView.ViewHolder>() {
private var Items : List<ItemPost> = emptyList()
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
return ItemRecyclerAdapter.ItemViewHolder(
LayoutInflater.from(parent.context)
.inflate(R.layout.layout_item_cart_list, parent, false)
)
}
override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
when(holder)
{
is ItemRecyclerAdapter.ItemViewHolder ->
{
holder.bind(Items.get(position))
}
}
}
override fun getItemCount(): Int {
return Items.size
}
fun SubmitItem(Item : ItemPost)
{
Items.toMutableList().add(Item)
}
class ItemViewHolder constructor(
Itemview : View
): RecyclerView.ViewHolder(Itemview)
{
val ItemImage : ImageView = Itemview.Item_image_cart
val ItemTitle : TextView = Itemview.Item_title_cart
val ItemCategory: TextView = Itemview.Item_category_cart
val ItemPrice : TextView = Itemview.Item_price_cart
fun bind (itempost : ItemPost)
{
ItemTitle.setText(itempost.Itemtitle)
ItemCategory.setText(itempost.ItemCategory)
ItemPrice.setText(itempost.ItemPrice)
val requestOptions = RequestOptions()
.placeholder(R.drawable.ic_baseline_brush_24)
.error(R.drawable.ic_baseline_brush_24)
Glide.with(itemView.getContext())
.applyDefaultRequestOptions(requestOptions)
.load(itempost.image)
.into(ItemImage)
}
}
}
這是我使用SubmitItem()in my 的地方ItemRecyclerAdapter.kt，其中包含我的商店應用程式的專案并從另一個片段顯示。CartAdapter 是我最近為了訪問功能而創建的購物車的配接器SubmitItem()。
ItemButton.setOnClickListener()
{
Toast.makeText(itemView.context, "${itempost.image}, ${itempost.Itemtitle}, ${itempost.ItemPrice}", Toast.LENGTH_SHORT).show()
CartAdapter.SubmitItem(ItemPost(itempost.image,itempost.Itemtitle,itempost.ItemCategory,itempost.ItemPrice))
}
這是我的片段代碼
ShopFragment.kt 包含我的物品的回收者視圖。
package com.example.karawapplication.fragments
import android.os.Bundle
import androidx.fragment.app.Fragment
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.Toast
import androidx.recyclerview.widget.LinearLayoutManager
import com.android.volley.Request
import com.android.volley.VolleyError
import com.android.volley.toolbox.JsonArrayRequest
import com.android.volley.toolbox.Volley
import com.example.karawapplication.ItemRecyclerAdapter
import com.example.karawapplication.R
import com.example.karawapplication.models.ItemPost
import kotlinx.android.synthetic.main.fragment_shop.*
import org.json.JSONException
import org.json.JSONObject
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private const val ARG_PARAM1 = "param1"
private const val ARG_PARAM2 = "param2"
/**
* A simple [Fragment] subclass.
* Use the [Shop.newInstance] factory method to
* create an instance of this fragment.
*/
class Shop : Fragment(){
// TODO: Rename and change types of parameters
private lateinit var ItemAdapter : ItemRecyclerAdapter
private var param1: String? = null
private var param2: String? = null
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
arguments?.let {
param1 = it.getString(ARG_PARAM1)
param2 = it.getString(ARG_PARAM2)
}
}
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_shop, container, false)
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
initRecyclerView()
addDataSet()
}
// CUSTOM FUNCTIONS
private fun addDataSet()
{
createDataset {
list -> ItemAdapter.SubmitList(list)
}
}
private fun initRecyclerView()
{
ShopRecycleView.layoutManager = LinearLayoutManager(activity)
ItemAdapter = ItemRecyclerAdapter()
ShopRecycleView.adapter = ItemAdapter
//Toast.makeText(context, "Recycler Trigger", Toast.LENGTH_SHORT).show()
}
// https://tutorials.eu/json-parsing-and-how-to-use-gson-in-android/
// Generates the data for the recycleview
fun createDataset(onSuccess: (List<ItemPost>) -> Unit){
val url = "http://api.karawcraftventure.com/item"
// LIST DATA VARIABLE FOR RECYCLEVIEW
val list = ArrayList<ItemPost>()
// VOLLEY API REQUEST
val Queue = Volley.newRequestQueue(activity)
val jsonObject = JsonArrayRequest(
Request.Method.GET,url,null,
{response ->
try
{
for (i in 0 until response.length())
{
val item : JSONObject = response.getJSONObject(i)
val API_Image : String = item.getString("product_url_image")
val API_ItemName : String = item.getString("product_name")
val API_Price : String = item.getString("product_price")
val API_Category : String = item.getString("product_category")
// Toast Notif if data is extracted or not
//Toast.makeText(context, "$API_ItemName - $API_Price - $API_Category", Toast.LENGTH_SHORT).show()
list.add(ItemPost(API_Image, API_ItemName, API_Category, API_Price))
}
onSuccess(list)
}
catch (e: JSONException)
{
e.printStackTrace()
}
},
{ error: VolleyError? -> Toast.makeText(context, error?.message.toString(), Toast.LENGTH_SHORT).show()
}
)
Queue.add(jsonObject)
}
companion object {
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* @param param1 Parameter 1.
* @param param2 Parameter 2.
* @return A new instance of fragment Shop.
*/
// TODO: Rename and change types and number of parameters
@JvmStatic
fun newInstance(param1: String, param2: String) =
Shop().apply {
arguments = Bundle().apply {
putString(ARG_PARAM1, param1)
putString(ARG_PARAM2, param2)
}
}
}
}
Cart.kt 另一方面，片段包含我的購物車。
package com.example.karawapplication.fragments
import android.os.Bundle
import androidx.fragment.app.Fragment
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.recyclerview.widget.LinearLayoutManager
import com.example.karawapplication.CartRecyclerAdapter
import com.example.karawapplication.ItemRecyclerAdapter
import com.example.karawapplication.R
import kotlinx.android.synthetic.main.fragment_cart.*
import kotlinx.android.synthetic.main.fragment_shop.*
import kotlinx.android.synthetic.main.fragment_shop.ShopRecycleView
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private const val ARG_PARAM1 = "param1"
private const val ARG_PARAM2 = "param2"
/**
* A simple [Fragment] subclass.
* Use the [Cart.newInstance] factory method to
* create an instance of this fragment.
*/
class Cart : Fragment() {
// TODO: Rename and change types of parameters
private lateinit var ItemAdapter : CartRecyclerAdapter
private var param1: String? = null
private var param2: String? = null
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
arguments?.let {
param1 = it.getString(ARG_PARAM1)
param2 = it.getString(ARG_PARAM2)
}
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
initRecyclerView()
}
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_cart, container, false)
}
private fun initRecyclerView()
{
Cart_RecyclerView.layoutManager = LinearLayoutManager(activity)
ItemAdapter = CartRecyclerAdapter()
Cart_RecyclerView.adapter = ItemAdapter
//Toast.makeText(context, "Recycler Trigger", Toast.LENGTH_SHORT).show()
}
companion object {
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* @param param1 Parameter 1.
* @param param2 Parameter 2.
* @return A new instance of fragment Cart.
*/
// TODO: Rename and change types and number of parameters
@JvmStatic
fun newInstance(param1: String, param2: String) =
Cart().apply {
arguments = Bundle().apply {
putString(ARG_PARAM1, param1)
putString(ARG_PARAM2, param2)
}
}
}
}
代碼沒有錯誤，但它沒有在我的購物車 recyclerview 片段中顯示任何輸出。
uj5u.com熱心網友回復：
（我將在這里遵循變數和函式的“以小寫字母開頭”的約定，因為我很累，而且不那么令人困惑）
您的submitItem函式只是創建items( items.toMutableList())的新副本并添加到其中。然后當你退出函式時它會立即被丟棄。
處理您的資料 ( getItemCount, onBindViewHolder) 參考的所有配接器代碼items，因此您需要更新它，并讓配接器知道它已更改：
fun submitItem(item: ItemPost) {
// plus creates a copy, but adds the new item without making the result mutable
items = items.plus(item)
// we also need to tell the adapter that the data has changed, so it can
// update - there are more efficient calls (you'll probably get a lint
// warning telling you to use one) but this is the simplest
notifyDataSetChanged()
}
這只是使您的配接器更新正確 - 我假設您已經正確設定了兩個片段之間的通信（通過父活動進行通信，使用視圖模型將一個片段的配接器傳遞給另一個）。如果需要，請閱讀以下內容：與片段通信
轉載請註明出處，本文鏈接：https://www.uj5u.com/qukuanlian/364618.html
標籤：安卓 接口 科特林 android-fragments android-recyclerview