[英]RecyclerView Adapter + Data Binding
好的,所以我正在嘗試在我的 recyclerview 適配器中實現數據綁定,我需要幫助,因為我不知道具體如何? 我正在嘗試從我的 recyclerview 適配器中刪除樣板代碼,這就是原因。 在下面檢查我的代碼:
custom_row(Recyclerview 項目布局)
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools">
<data>
<variable
name="toDoData"
type="com.jovanovic.stefan.tododemo.data.ToDoData" />
</data>
<androidx.constraintlayout.widget.ConstraintLayout
android:id="@+id/rootLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="4dp">
<androidx.constraintlayout.widget.ConstraintLayout
android:id="@+id/row_background"
android:layout_width="match_parent"
android:layout_height="120dp"
android:background="@drawable/item_background"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<TextView
android:id="@+id/title_txt"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="20dp"
android:layout_marginTop="16dp"
android:text="@{toDoData.title}"
android:textColor="@color/darkGray"
android:textSize="20sp"
android:textStyle="bold"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="@+id/description_txt"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="16dp"
android:layout_marginBottom="16dp"
android:maxLength="160"
android:maxLines="3"
android:text="@{toDoData.description}"
android:textColor="@color/darkGray"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="@+id/title_txt"
app:layout_constraintTop_toBottomOf="@+id/title_txt" />
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
</layout>
待辦事項數據
@Parcelize
@Entity(tableName = "todo_table")
data class ToDoData(
@PrimaryKey(autoGenerate = true)
var id: Int,
var title: String,
var priority: Int,
var description: String
) : Parcelable
MyAdapter(Recyclerview 適配器)
class MyAdapter: RecyclerView.Adapter<MyAdapter.MyViewHolder>() {
class MyViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MyViewHolder {
val view = LayoutInflater.from(parent.context).inflate(R.layout.custom_row, parent, false)
return MyViewHolder(view)
}
override fun getItemCount(): Int {
TODO("Not yet implemented")
}
override fun onBindViewHolder(holder: MyViewHolder, position: Int) {
TODO("Not yet implemented")
}
}
你快到了。 要完成您的實施,請執行以下操作。
在您的適配器中,創建將支持數據綁定的視圖持有者。
class ViewHolder private constructor(private val binding: CustomRowBinding)
: RecyclerView.ViewHolder(binding.root) {
fun bind(todo: ToDoData) {
binding.todo = toDoData
// make sure to include this so your view will be updated
binding.executePendingBindings()
}
companion object {
fun from(parent: ViewGroup): ViewHolder {
val layoutInflater = LayoutInflater.from(parent.context)
val binding = CustomRowBinding.inflate(layoutInflater, parent, false)
return ViewHolder(binding)
}
}
}
在你的 oncreateViewHolder
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
return ViewHolder.from(parent)
}
最后是 onBindViewHolder
override fun onBindViewHolder(holder: ViewHolder, position: Int) {
val todo = todoList[position] // this will be the list object you created
holder.bind(todo)
}
你可以試試SmartRecyclerView
smartRecyclerView = findViewById(R.id.smartRecyclerView)
smartRecyclerView.apply{
initSmartRecyclerView(activity = this,smartRecyclerViewListener = smartRecyclerViewListener,isPaginated = true)
isEnabled = false // enable/disable SwipeRefreshLayout
setClickListener(onItemClickListener) // (optional, set
clickListener on recyclerview items)
setViewAttachListener(viewAttachListener) // (optional, set viewAttachListener on recyclerview items)
setScrollListener(recyclerViewListener) // (optional, set
setScrollListener on recyclerview items)
setShimmerLayout(R.layout.item_loader) // (optional, set shimmer layout while user waits for the data to load)
}
private val smartRecyclerViewListener:SmartRecyclerViewListener<T> = object:SmartRecyclerViewListener<T>{
override fun getItemViewType(model: T): Int {
return 0 //return viewType from model
}
override fun getViewLayout(viewType: Int): Int {
return R.layout.item_file // on the basis of viewType return the layout you want for the recyclerview item.
}
override fun setListSize(size: Int) {
//this method will be called whenever smartRecyclerView undergoes any operation.
}
override fun onRefresh() {
//do something on refresh....
smartRecyclerView.isRefreshing = false
Toast.makeText(baseContext,"OnRefresh Called",Toast.LENGTH_LONG).show()
}
override fun onLoadNext() {
// onLoadNext() will be called if isPaginated = true and user scrolls to bottom or the smartRecyclerView.
Toast.makeText(baseContext,"OnLoadNext",Toast.LENGTH_LONG).show()
}
//DiffUtils Callback functions
override fun areContentsTheSame(newItem: T, oldItem: T): Boolean {
return newItem.distance==oldItem.distance
}
override fun areItemsTheSame(newItem: T, oldItem: T): Boolean {
return newItem.uuid==oldItem.uuid
}
}
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