未连接适配器；在 Kotlin 上跳过布局
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【中文标题】未连接适配器；在 Kotlin 上跳过布局【英文标题】：No adapter attached; skipping layout on Kotlin 【发布时间】：2021-08-20 17:52:19 【问题描述】：我看到了一些关于这个频繁错误的线程，但没有人能解决我的问题（即使在尝试了解决方案之后），我希望我的代码显示组件，其中包含我从 API 加载的数据，类似于 React Native 中的 Flatlist：
我用于“产品”组件的活动，它是一张卡片：
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_
android:layout_
tools:context=".Authenticated">
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/recyprod"
android:layout_
android:layout_
android:layout_marginStart="1dp"
android:layout_marginLeft="1dp"
android:layout_marginEnd="1dp"
android:layout_marginRight="1dp"
android:layout_marginBottom="2dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
我用于 RecyclerView 的活动：
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_
android:layout_
tools:context=".Authenticated">
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/recyprod"
android:layout_
android:layout_
android:layout_marginStart="1dp"
android:layout_marginLeft="1dp"
android:layout_marginEnd="1dp"
android:layout_marginRight="1dp"
android:layout_marginBottom="2dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
我的适配器：
package com.mlp.project.utils
import android.content.Context
import android.view.LayoutInflater
import android.view.View
import androidx.recyclerview.widget.RecyclerView
import com.mlp.project.api.model.Product
import android.view.ViewGroup
import android.widget.ImageView
import android.widget.TextView
import com.mlp.project.R
import kotlinx.android.synthetic.main.activity_product.view.*
class MyAdapter(val context: Context, val productList: List<Product>): RecyclerView.Adapter<MyAdapter.ViewHolder>()
class ViewHolder(view: View) : RecyclerView.ViewHolder(view)
var name: TextView
var price: TextView
var productImage: ImageView
init
name = itemView.name
price = itemView.price
productImage = itemView.productImage
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder
val itemView = LayoutInflater.from(context).inflate(R.layout.activity_product, parent, false)
return ViewHolder(itemView)
override fun onBindViewHolder(holder: ViewHolder, position: Int)
holder.name.text = productList[position].name
holder.price.text = productList[position].price.toString()
override fun getItemCount(): Int
return productList.size
我的活动：
class Authenticated : AppCompatActivity()
private lateinit var sessionManager: SessionManager
private lateinit var apiClient: ApiClient
lateinit var myadapter: MyAdapter
lateinit var linearLayoutManager: LinearLayoutManager
override fun onCreate(savedInstanceState: Bundle?)
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_authenticated)
recyprod.setHasFixedSize(true)
linearLayoutManager = LinearLayoutManager(this)
recyprod.layoutManager = linearLayoutManager
fetchPosts()
private fun fetchPosts()
// val count: Number
apiClient = ApiClient()
sessionManager = SessionManager(this)
// Pass the token as parameter
apiClient.getApiService().fetchPosts(token = "$sessionManager.fetchAuthToken()")
.enqueue(object : Callback<ProductResponse>
override fun onFailure(call: Call<ProductResponse>, t: Throwable)
d("Authenticated", "onFailure" + t.message)
override fun onResponse(call: Call<ProductResponse>, response: Response<ProductResponse>)
Log.d("Response", response.toString())
val responseBody = response.body()
myadapter = MyAdapter(baseContext, responseBody!!.products)
recyprod.adapter = myadapter
)
我得到的结果照片：
来自 API 的 JSON 数据：
"products": [
"name": "Tapas",
"price": 10,
"productImage": "uploads\\2021-04-04T15-43-36.826Z_tapas.png",
"_id": "6069dea870f35f0f90242f4a",
"request":
"type": "GET",
"url": "https://katobackend.azurewebsites.net/api/product/6069dea870f35f0f90242f4a"
,
"name": "Cupcake",
"price": 6,
"productImage": "uploads\\2021-04-04T20-04-27.036Z_detail-5.jpg",
"_id": "606a1bcba294652bb03e6952",
"request":
"type": "GET",
"url": "https://katobackend.azurewebsites.net/api/product/606a1bcba294652bb03e6952"
,
"name": "Bottle",
"price": 6,
"productImage": "uploads/2021-05-23T14-27-33.336Z_Water.jpg",
"_id": "60aa6655898ea9002454b27f",
"request":
"type": "GET",
"url": "https://katobackend.azurewebsites.net/api/product/60aa6655898ea9002454b27f"
,
"name": "Bottle",
"price": 6,
"productImage": "uploads/2021-05-23T14-36-50.590Z_Water.jpg",
"_id": "60aa688245340b0024735b5c",
"request":
"type": "GET",
"url": "https://katobackend.azurewebsites.net/api/product/60aa688245340b0024735b5c"
]
Logcat：
06-02 14:31:15.877 12069-12069/com.mlp.project E/RecyclerView: No adapter attached; skipping layout
06-02 14:31:15.951 12069-12069/com.mlp.project E/RecyclerView: No adapter attached; skipping layout
06-02 14:31:16.050 12069-12069/com.mlp.project D/Response: Responseprotocol=h2, code=200, message=, url=https://katobackend.azurewebsites.net/api/product
【问题讨论】：
这能回答你的问题吗？ recyclerview No adapter attached; skipping layout @Zain 我从 Shivam Pokhriyal 那里选择了下面的答案，问题解决了 【参考方案1】：您需要修改您的活动，以便在绘制 UI 时为您的回收站视图分配一个适配器，而不是等到您得到结果。
将您的适配器声明修改为：
class MyAdapter(val context: Context): RecyclerView.Adapter<MyAdapter.ViewHolder>()
private var productList: List<Product> = emptyList()
fun setProductList(list: List<Product>)
productList = list
所以，在活动中的onCreate 方法中，在方法末尾添加：
myadapter = MyAdapter(baseContext)
recyprod.adapter = myadapter
最后，在你的 fetchPost onResponse 回调中，替换这个：
myadapter = MyAdapter(baseContext, responseBody!!.products)
recyprod.adapter = myadapter
用这个：
myadapter.setProductList(responseBody!!.products)
myadapter.notifyDataSetChanged()
【讨论】：
抱歉，我需要在哪里添加这些行：myadapter = MyAdapter(baseContext) recyprod.adapter = myadapter 因为它显示错误“没有为参数 'productList' 传递值”，对于适配器和活动，当我替换你的告诉我我得到“类型不匹配：找到所需的 ProductRespond List以上是关于未连接适配器；在 Kotlin 上跳过布局的主要内容，如果未能解决你的问题，请参考以下文章
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