我的 recyclerview 片段： 这是我设置我的回收器视图的片段，我希望在点击继续按钮（btn_continue）时将列表的其余部分（实际上是下一页）添加到我的列表中，当我单击按钮但它会删除上一个列表并显示新列表，我使用 kotlin coruotine、viewmodel 和 recyclerview
class AllUnpublishedAdsFragment : Fragment() {
lateinit var unpublishedAdsAdapter: UnpublishedAdsAdapter
var items = ArrayList<M_Ads>()
lateinit var loadMoreItems: ArrayList<M_Ads>
lateinit var scrollListener: RecyclerViewLoadMoreScroll
lateinit var mLayoutManager: RecyclerView.LayoutManager
val page = "1"
var newpage = page.toInt()
var navController: NavController? = null
lateinit var btn_continue: Button
private lateinit var viewModel: MainViewmodels
lateinit var token: String
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_all_unpublished_ads, container,
false)
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
btn_continue = view.findViewById<Button>(R.id.btn_continueAds)
token = arguments?.getString(TOKEN_KEY).toString()
Log.i("TOKEN", token)
setupViewModel(token, page)
continueAds()
unpublishedAdsAdapter.itemClickListener = { item, position ->
val id = item.id
val bundle_id = Bundle()
bundle_id.putString(ID_KEY, id.toString())
navController = Navigation.findNavController(view)
//view.findNavController().navigate(R.id.action_UnpublishedAds_to_Detail,
bundle_id)
navController!!.navigate(
R.id.action_allUnpublishedAdsFragment_to_adsDetailFragment,
bundle_id
)
}
}
private fun setupViewModel(token: String, page: String) {
LoadingDialog.show(requireContext(), { ld ->
recy_unpublished_ads.layoutManager = LinearLayoutManager(activity)
val decoration = DividerItemDecoration(activity, DividerItemDecoration.VERTICAL)
recy_unpublished_ads.addItemDecoration(decoration)
viewModel = ViewModelProvider(this).get(MainViewmodels::class.java)
unpublishedAdsAdapter = UnpublishedAdsAdapter()
recy_unpublished_ads.adapter = unpublishedAdsAdapter
viewModel.adsListObserve().observe({ lifecycle }, { model ->
items.clear()
items.addAll(model.adsList!!)
unpublishedAdsAdapter.setUpdateData(items)
ld.dismiss()
btn_continue.visibility = View.VISIBLE
})
viewModel.getAdsList(token, page)
})
}
fun continueAds() {
var isTouched=false
btn_continue.setOnClickListener {
isTouched=true
newpage = newpage + 1
Log.i("CONTINUE", newpage.toString())
setupViewModel(token, newpage.toString())
unpublishedAdsAdapter.notifyDataSetChanged()
isTouched=false
}
}
RetrofitInstance 类
class RetrofitInstance {
companion object{
fun getRetrofitInstance (): Retrofit{
// val interceptor = HttpLoggingInterceptor()
// interceptor.setLevel(HttpLoggingInterceptor.Level.BODY)
// val client: OkHttpClient = OkHttpClient.Builder().addInterceptor(interceptor).build()
val okHttpClient: OkHttpClient = OkHttpClient.Builder()
.readTimeout(60, TimeUnit.SECONDS)
.connectTimeout(60, TimeUnit.SECONDS)
.build()
return Retrofit.Builder()
.baseUrl(BASEURL)
.addConverterFactory(GsonConverterFactory.create())
.client(okHttpClient)
.build()
}
}
}
我的适配器：
class UnpublishedAdsAdapter : RecyclerView.Adapter<UnpublishedAdsAdapter.MyViewHolder>() {
var items = ArrayList<M_Ads>()
var itemClickListener: ((item: M_Ads, position: Int) -> Unit)? = null
lateinit var mcontext: Context
class ItemViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView)
class LoadingViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView)
fun setUpdateData(items: ArrayList<M_Ads>) {
this.items = items
notifyDataSetChanged()
}
class MyViewHolder(view: View) : RecyclerView.ViewHolder(view) {
val img_ads = view.findViewById<ImageView>(R.id.img_recy_ads)
val txt_title = view.findViewById<TextView>(R.id.txt_recy_ads_title)
val txt_accountType = view.findViewById<TextView>(R.id.txt_recy_ads_acctype)
fun bind(data: M_Ads) {
txt_title.setText(data.title)
txt_accountType.setText(data.accountType)
if (!data.image1.equals("")) {
Picasso.with(img_ads.context).load(data.image1).into(img_ads)
} else {
}
}
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MyViewHolder {
mcontext = parent.context
return if (viewType == Constant.VIEW_TYPE_ITEM) {
val view = LayoutInflater.from(parent.context)
.inflate(R.layout.row_recy_unpublished_ads, parent, false)
MyViewHolder(view)
} else {
val view =
LayoutInflater.from(mcontext).inflate(R.layout.progress_loading, parent, false)
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
view.progressbar.indeterminateDrawable.colorFilter =
BlendModeColorFilter(Color.WHITE, BlendMode.SRC_ATOP)
} else {
view.progressbar.indeterminateDrawable.setColorFilter(
Color.WHITE,
PorterDuff.Mode.MULTIPLY
)
}
MyViewHolder(view)
}
}
override fun onBindViewHolder(holder: MyViewHolder, position: Int) {
holder.bind(items.get(position))
handleClick(holder)
}
fun handleClick(holder: UnpublishedAdsAdapter.MyViewHolder) {
holder.itemView.setOnClickListener {
val position = holder.adapterPosition
itemClickListener?.invoke(items.get(position), position)
}
}
override fun getItemCount(): Int {
return items.size
}
我的视图模型：
class MainViewmodels:ViewModel() {
lateinit var getAds:MutableLiveData<Main_ModelAds>
init {
getAds= MutableLiveData<Main_ModelAds>()
}
fun adsListObserve():MutableLiveData<Main_ModelAds>{
return getAds
}
fun getAdsList(token:String,page:String){
viewModelScope.launch(Dispatchers.IO) {
try {
Log.i("ERRORRES",token + "")
val retrofitInstance=RetrofitInstance.getRetrofitInstance().create(RetrofitService::class.java)
val response=retrofitInstance.unPublishedAdsList(token,page)
getAds.postValue(response)
}catch (ex:Exception){
Log.i("ERRORRES", ex.message.toString() + "")
}
}
}