错误：
没有显示餐厅列表，并且在logcat窗口中显示以下内容：
E / RecyclerView：未连接适配器；跳过布局
我试图解决的问题：
我附上HomeFragment和适配器文件的代码
HomeFragment.class
class HomeFragment : Fragment() {
lateinit var recyclerRestaurant: RecyclerView
lateinit var progressLayout: RelativeLayout
lateinit var progressBar: ProgressBar
lateinit var layoutManager: RecyclerView.LayoutManager
lateinit var recyclerAdapter: RestaurantRecyclerAdapter
var restaurantList = arrayListOf<Restaurant>()
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
// Inflate the layout for this fragment
val view = inflater.inflate(R.layout.fragment_home, container, false)
setHasOptionsMenu(true)
recyclerRestaurant = view.findViewById(R.id.recyclerRestaurant)
progressLayout = view.findViewById(R.id.progressLayout)
progressBar = view.findViewById(R.id.progressBar)
layoutManager = LinearLayoutManager(activity)
progressLayout.visibility= View.VISIBLE
val queue = Volley.newRequestQueue(activity as Context)
val url = "http://13.235.250.119/v2/restaurants/fetch_result/"
if (ConnectionManager().checkConnectivity(activity as Context)) {
val jsonObjectRequest = object : JsonObjectRequest(
Request.Method.GET,url , null,
Response.Listener<JSONObject>{
progressLayout.visibility = View.GONE
try {
val data = it.getJSONObject("data")
val success = data.getBoolean("success")
if (success) {
val data = it.getJSONObject("data").getJSONArray("data")
for(i in 0 until data.length()) {
val resObject = data.getJSONObject(i)
val restaurants = Restaurant(
resObject.getString("id").toInt(),
resObject.getString("name"),
resObject.getString("rating"),
resObject.getString("cost_per_person"),
resObject.getString("image_url")
)
restaurantList.add(restaurants)
if(activity != null) {
recyclerAdapter = RestaurantRecyclerAdapter(activity as Context, restaurantList)
val mLayoutManager=LinearLayoutManager(activity)
recyclerRestaurant.layoutManager =mLayoutManager
recyclerRestaurant.adapter = recyclerAdapter
recyclerRestaurant.setHasFixedSize(true)
}
}
}
else {
Toast.makeText(
activity as Context,
"some error has occurred",
Toast.LENGTH_SHORT
).show()
}
}catch (e: JSONException){
e.printStackTrace()
}
},
Response.ErrorListener {
if(activity != null){
Toast.makeText(activity as Context,"Volley error has occurred", Toast.LENGTH_LONG).show() }
}) {
override fun getHeaders(): MutableMap<String, String> {
val headers = HashMap<String, String>()
headers["Content-type"] = "application/json"
headers["token"] = "06f579db533924"
return headers
}
}
queue.add(jsonObjectRequest)
}else{
val dialog = AlertDialog.Builder(activity as Context)
dialog.setTitle("error")
dialog.setMessage("Internet connection not found")
dialog.setPositiveButton("open settings"){ text, listener->
val settingsIntent = Intent(Settings.ACTION_WIRELESS_SETTINGS)
startActivity(settingsIntent)
activity?.finish()
}
dialog.setNegativeButton("exit"){text,listener->
ActivityCompat.finishAffinity(activity as Activity)
}
dialog.create()
dialog.show()
}
return view
}
}
RestaurantRecyclerAdapter.class
class RestaurantRecyclerAdapter(val context:Context, val itemList: ArrayList<Restaurant> ):RecyclerView.Adapter<RestaurantRecyclerAdapter.RestaurantViewHolder>() {
class RestaurantViewHolder(view: View): RecyclerView.ViewHolder(view){
val txtRestaurantName :TextView= view.findViewById(R.id.txtRestaurantName)
val imgRestaurantImage :ImageView = view.findViewById(R.id.imgRestaurantImage)
val txtRating : TextView = view.findViewById(R.id.txtRating)
val txtPerPerson : TextView = view.findViewById(R.id.txtPerPerson)
val llContent : LinearLayout = view.findViewById(R.id.llContent)
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RestaurantViewHolder {
val view = LayoutInflater.from(parent.context).inflate(R.layout.recycler_single_row,parent,false)
return RestaurantViewHolder(view)
}
override fun getItemCount(): Int {
return itemList.size
}
override fun onBindViewHolder(holder: RestaurantViewHolder, position: Int) {
val restaurant = itemList[position]
holder.txtRestaurantName.text = restaurant.name
holder.txtRating.text = restaurant.rating
holder.txtPerPerson.text = restaurant.cost_per_person
Picasso.get().load(restaurant.image).error(R.drawable.ic_food).into(holder.imgRestaurantImage)