我有一个片段,显示带有天气信息的城市列表。我正在使用RecyclerView,并且尝试在RecyclerView适配器中实现数据绑定库,但是由于某些原因,我遇到了此编译错误:
> error: cannot find symbol import
com.example.zach.weatherapp.databinding.CityListItemBindingImpl;
> ^
> symbol: class CityListItemBindingImpl
> location: package com.example.zach.weatherapp.databinding
这是一个自动生成的类,所以我真的不知道错误在哪里。当xml文件中出现某些错误时,我之前在其他布局中也遇到了相同的错误,但是在这里看起来还不错。
ForecastAdapter.kt
package com.example.zach.weatherapp.Adapter
import ...
class ForecastAdapter(var myDataset: List<City>) :
RecyclerView.Adapter<ForecastAdapter.ForecastViewHolder>() {
var context:Context?=null
// Provide a reference to the views for each data item
// Complex data items may need more than one view per item, and
// you provide access to all the views for a data item in a view holder.
class ForecastViewHolder(var binding: CityListItemBinding) : RecyclerView.ViewHolder(binding.root){
fun bind(city: City){
binding.city = city
}
}
// Create new views (invoked by the layout manager)
override fun onCreateViewHolder(parent: ViewGroup,
viewType: Int): ForecastAdapter.ForecastViewHolder {
context = parent.context
val layoutIdForListItem = R.layout.city_list_item
val inflater = LayoutInflater.from(context)
val shouldAttachToParentImmediately = false
val binding = DataBindingUtil.inflate<CityListItemBinding>(inflater,layoutIdForListItem,parent,shouldAttachToParentImmediately)
//val view = inflater.inflate(layoutIdForListItem, parent, shouldAttachToParentImmediately)
return ForecastViewHolder(binding)
}
// Replace the contents of a view (invoked by the layout manager)
override fun onBindViewHolder(holder: ForecastViewHolder, position: Int) {
val city = myDataset[position]
holder.bind(city)
Glide.with(context)
.load("http://openweathermap.org/img/w/${city.weather[0].icon}.png")
.into(holder.binding.forceastImageView)
holder.binding.container.setOnClickListener{ view: View ->
Timber.d("Clicked on city %s",city.name)
Navigation.findNavController(view).navigate(ListFragmentDirections.actionListFragmentToForecastDetailsFragment(city.id))}
}
// Return the size of your dataset (invoked by the layout manager)
override fun getItemCount() = myDataset.size
}
city_list_item.xml
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
xmlns:android="http://schemas.android.com/apk/res/android">
<data>
<variable name="city" type="com.example.zach.weatherapp.data.City"/>
</data>
<androidx.constraintlayout.widget.ConstraintLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/container">
<TextView
tools:text="Caen"
android:text="@{city.name}"
android:layout_width="wrap_content"
android:layout_height="wrap_content" android:id="@+id/city_name_textview"
app:layout_constraintStart_toStartOf="parent" android:layout_marginStart="16dp"
android:layout_marginTop="16dp" app:layout_constraintTop_toTopOf="parent"
android:fontFamily="@font/roboto_light" android:textSize="22sp" android:textStyle="bold"
android:maxLines="1" android:ellipsize="end"/>
<TextView
tools:text="Sunny"
android:text="@{city.weather[0].description}"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/city_forecast_textview" app:layout_constraintStart_toStartOf="parent"
android:layout_marginStart="16dp"
app:layout_constraintTop_toBottomOf="@+id/city_name_textview" android:fontFamily="@font/roboto_light"
android:layout_marginBottom="16dp" app:layout_constraintBottom_toBottomOf="parent"/>
<ImageView
android:layout_width="48dp"
android:layout_height="48dp" app:srcCompat="@drawable/sunny"
android:id="@+id/forceast_imageView" android:layout_marginTop="8dp"
app:layout_constraintTop_toTopOf="parent" android:layout_marginBottom="8dp"
app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintVertical_bias="0.562"
android:layout_marginEnd="32dp" app:layout_constraintEnd_toStartOf="@+id/temperatures_layout"/>
<LinearLayout
android:orientation="vertical"
android:layout_width="wrap_content"
android:layout_height="wrap_content" android:id="@+id/temperatures_layout"
app:layout_constraintEnd_toEndOf="parent" android:layout_marginEnd="16dp" android:layout_marginBottom="8dp"
app:layout_constraintBottom_toBottomOf="parent" android:layout_marginTop="8dp"
app:layout_constraintTop_toTopOf="parent">
<TextView
tools:text="15°"
android:text="@{city.main.temp_max}"
android:layout_width="wrap_content"
android:layout_height="wrap_content" android:id="@+id/max_temperature_textview"
android:fontFamily="@font/roboto_light"
tools:layout_editor_absoluteY="17dp" tools:layout_editor_absoluteX="313dp"/>
<TextView
tools:text="9°"
android:text="@{city.main.temp_min}"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/min_temperature_textview"
android:fontFamily="@font/roboto_light" tools:layout_editor_absoluteY="45dp"
tools:layout_editor_absoluteX="321dp" android:layout_gravity="right"/>
</LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
</layout>
这可能只是Android Studio错误,因为xml文件看起来不错。
更新:
错误似乎来自Xml。我在xml布局中删除了android:text="@{city.xxx}"
,而是在ViewHolder绑定方法中手动更新了textViews,如下所示:
fun bind(boundCity: City){
with(binding){
cityNameTextview.text = boundCity.name
cityForecastTextview.text = boundCity.weather[0].description
maxTemperatureTextview.text = "${boundCity.main.temp_max}°"
minTemperatureTextview.text = "${boundCity.main.temp_min}°"
Glide.with(root.context)
.load("http://openweathermap.org/img/w/${boundCity.weather[0].icon}.png")
.into(forceastImageView)
container.setOnClickListener{ view: View ->
Timber.d("Clicked on city %s",boundCity.name)
Navigation.findNavController(view).navigate(ListFragmentDirections.actionListFragmentToForecastDetailsFragment(boundCity.id))}
}
}
而且我不再收到该错误。每当我在文本视图中添加android:text="@{city.xx}"
并在bind方法中绑定city变量时,都会出现错误。我仍然不知道为什么。。。
答案 0 :(得分:0)
我相信这应该对您有用;
class ForecastAdapter(private var myDataset: List<City>) : RecyclerView.Adapter<ForecastAdapter.ForecastViewHolder>() {
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ForecastAdapter.ForecastViewHolder {
val itemBinding = CityListItemBinding.inflate(LayoutInflater.from(parent.context), parent, false)
return ForecastViewHolder(itemBinding)
}
override fun onBindViewHolder(holder: ForecastViewHolder, position: Int) {
val city = myDataset[position]
holder.bind(city)
}
override fun getItemCount() = myDataset.size
inner class ForecastViewHolder(var binding: CityListItemBinding) : RecyclerView.ViewHolder(binding.root){
fun bind(boundCity: City){
with(binding) {
city = boundCity
Glide.with(root.context)
.load("http://openweathermap.org/img/w/${city.weather[0].icon}.png")
.into(forceastImageView)
container.setOnClickListener { view ->
Timber.d("Clicked on city %s", city.name)
Navigation.findNavController(view).navigate(ListFragmentDirections.actionListFragmentToForecastDetailsFragment(city.id))
}
}
}
答案 1 :(得分:0)
嘿,您可以尝试在<data>
标签之后添加以下行:
<import type="android.view.View" />
当我遇到该错误时,我发现这对我有用。