将视图模型绑定到回收器视图项.xml使用数据绑定，安卓?

Question

我想在 xml 布局文件中从视图模型绑定适配器上的数据

这是我的片段类。

class NotificationFragment : Fragment() {
var customeProgressDialog: CustomeProgressDialog? = null
private val appPreferences: AppPreference by inject()
private val notificationViewModel: NotificationViewModel by viewModel()
private lateinit var binding: FragmentNotificationBinding
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
binding = FragmentNotificationBinding.inflate(inflater, container, false)
return binding.getRoot()
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
binding.notification.layoutManager=LinearLayoutManager(activity, LinearLayoutManager.VERTICAL, false)
customeProgressDialog = CustomeProgressDialog(activity)
notificationViewModel.notifications(
appPreferences.getUsername(),
appPreferences.getPassword(),
appPreferences.getUserId()
)
initObservables()
}
private fun initObservables() {
notificationViewModel.progressDialog?.observe(this, Observer {
if (it!!) customeProgressDialog?.show() else customeProgressDialog?.dismiss()
})
notificationViewModel.apiResponse?.observe(
viewLifecycleOwner,
androidx.lifecycle.Observer { response ->
if (response.dataList != null) {
var notificationAdapter = NotificationAdapter(response.dataList as List<Data>)
notificationAdapter.notifyDataSetChanged()
binding.notification.adapter = notificationAdapter
}
})
}
}

我的视图模型

class NotificationViewModel(networkCall: NetworkCall) : ViewModel(),
Callback<ApiResponse> {
var progressDialog: SingleLiveEvent<Boolean>? = null
var apiResponse: MutableLiveData<ApiResponse>? = null
var networkCall: NetworkCall;
init {
progressDialog = SingleLiveEvent<Boolean>()
apiResponse = MutableLiveData<ApiResponse>()
this.networkCall = networkCall
}
fun notifications(username: String?, password: String?, userId: String?) {
progressDialog?.value = true
val apiPost = ApiPost()
apiPost.userName = username
apiPost.password = password
apiPost.UserId = userId
apiPost.FileType = NetworkConstant.FILE_TYPE_NOT
networkCall.getPDF(apiPost).enqueue(this)
}
override fun onFailure(call: Call<ApiResponse>, t: Throwable) {
progressDialog?.value = false
}
override fun onResponse(call: Call<ApiResponse>, response: Response<ApiResponse>) {
progressDialog?.value = false
apiResponse?.value = response.body()
}
}

适配器类

lass NotificationAdapter(private val list: List<Data>) :
RecyclerView.Adapter<NotificationAdapter.ViewHolder>() {

override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
val inflater = LayoutInflater.from(parent.context)
val view = inflater.inflate(R.layout.element_list, parent, false)
return ViewHolder(view)
}
override fun onBindViewHolder(holder: ViewHolder, position: Int) {
val movie: Data = list[position]
holder.bind(movie)
holder.itemView.setOnClickListener {
if (!TextUtils.isEmpty(movie.filePath)) {
try {
val browserIntent = Intent(Intent.ACTION_VIEW, Uri.parse(movie.filePath))
holder.itemView.context.startActivity(browserIntent)
} catch (e: Exception) {
e.printStackTrace()
}
}
}
}
override fun getItemCount(): Int = list.size
inner class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
fun bind(movie: Data) {
with(itemView) {
tv_notifi.text = movie.displayName
tv_date.text = movie.UpdatedDate
if (movie.description != null) {
tv_brief.text = movie.description
tv_brief.visibility = View.VISIBLE
}
}
}
}
}

这是我的项目 xml 布局

<layout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<data>
<variable
name="viewmodel"
type="com.mountmeru.viewmodel.NotificationViewModel" />
</data>
<androidx.cardview.widget.CardView
android:id="@+id/main_cardview"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="5dp">
<androidx.appcompat.widget.LinearLayoutCompat
android:id="@+id/main_cardrl"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
<RelativeLayout
android:id="@+id/rl_newsdate"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="0.3">
<androidx.appcompat.widget.AppCompatTextView
android:id="@+id/tv_notifi"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_marginTop="10dp"
android:layout_marginRight="10dp"
android:maxLines="2"
android:text="hey i am notification text"
android:textColor="@android:color/black"
android:textSize="16sp" />
<androidx.appcompat.widget.AppCompatTextView
android:id="@+id/tv_brief"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/tv_notifi"
android:layout_marginLeft="10dp"
android:layout_marginTop="5dp"
android:layout_marginRight="10dp"
android:textColor="@android:color/black"
android:textSize="16sp"
android:visibility="gone" />
<androidx.appcompat.widget.AppCompatTextView
android:id="@+id/tv_date"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/tv_brief"
android:layout_marginLeft="10dp"
android:layout_marginTop="2dp"
android:layout_marginRight="10dp"
android:maxLines="1"
android:text="hey i am date"
android:textColor="@color/inactive_text"
android:textSize="14sp" />
</RelativeLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_toRightOf="@+id/rl_newsdate"
android:layout_weight="0.7"
android:padding="5dp">
<androidx.appcompat.widget.AppCompatImageView
android:id="@+id/iv_notifi"
android:layout_width="match_parent"
android:layout_height="75dp"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:src="@drawable/mer" />
</RelativeLayout>
</androidx.appcompat.widget.LinearLayoutCompat>
</androidx.cardview.widget.CardView>
</layout>

我能够对片段进行绑定，但对于适配器，我不确定如何继续。

Answer 1

如果我正确理解您的问题，您希望将数据传递到 xml 中的适配器。为此，您需要为回收器视图编写自定义绑定适配器。 此链接包含您所需的一切。 https://android.jlelse.eu/how-to-bind-a-list-of-items-to-a-recyclerview-with-android-data-binding-1bd08b4796b4