我里面有一个带有RecyclerAdapter的片段。我想在onCreateView
方法中初始化适配器,但在此语句中抛出"Type mismatch. Required : Context , Found : FragmentActivity"
的错误
我不知道为什么第一个显示此错误,而第二个不包含编译时错误。
显示错误
recyclerView!!.adapter = RestaurantMenuAdapter(activity)
未显示错误
recyclerView!!.layoutManager = LinearLayoutManager(activity)
Fragment.kt
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?): View? {
// Inflate the layout for this fragment
val view = inflater.inflate(R.layout.fragment_restaurant_menu, container, false)
recyclerView = view.findViewById(R.id.restaurant_container)
recyclerView!!.adapter = RestaurantMenuAdapter(activity)
recyclerView!!.layoutManager = LinearLayoutManager(activity)
RecyclerAdapter.kt
class RestaurantMenuAdapter (val context : Context) : RecyclerView.Adapter<RecyclerView.ViewHolder>() {
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
val inflater = parent.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE) as LayoutInflater
return object : RecyclerView.ViewHolder(inflater.inflate(R.layout.item_menu1, parent, false)) {
}
}
override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
}
override fun getItemCount(): Int {
return 10
}
}
将此更改为-:
recyclerView!!.adapter = RestaurantMenuAdapter(activity)
收件人:
recyclerView!!.adapter = RestaurantMenuAdapter(activity.applicationContext)
保持适配器不变,只使用“ activity !!”初始化适配器的位置。
recyclerView.adapter = RestaurantMenuAdapter(activity!!)
您的适配器将保持不变。
class RestaurantMenuAdapter (val context : Context) : RecyclerView.Adapter<RecyclerView.ViewHolder>() {
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
val inflater = parent.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE) as LayoutInflater
return object : RecyclerView.ViewHolder(inflater.inflate(R.layout.item_menu1, parent, false)) {
}
}
override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
}
override fun getItemCount(): Int {
return 10
}
}
更改回收站适配器从上下文到活动。
class RestaurantMenuAdapter (val context : Activity) : RecyclerView.Adapter<RecyclerView.ViewHolder>() {
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
val inflater = parent.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE) as LayoutInflater
return object : RecyclerView.ViewHolder(inflater.inflate(R.layout.item_menu1, parent, false)) {
}
}
override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
}
override fun getItemCount(): Int {
return 10
}
}
recyclerView !!。adapter = RestaurantMenuAdapter(this)
收件人
recyclerView !!。adapter = RestaurantMenuAdapter(this.requireActivity())