kotlin 整合RecyclerView 上拉刷新 下拉加载
2020-05-21 本文已影响0人
Jamesbond_5521
使用代码如下
RefreshListView(refreshLayout,recyclerView).apply {
recyclerView.layoutManager = LinearLayoutManager(this@RecyclerViewTestActivity)
onProcess = {
RetrofitServiceManager.create(PosApi::class.java).getList(page,pageSize).get()
}
register(String::class.java,R.layout.test_item){holder, data ->
(holder[R.id.textView] as TextView).text = data
}
}
代码构建如下
//加载更多的滑动监听
abstract class onLoadMoreListener : RecyclerView.OnScrollListener() {
private var countItem = 0
private var lastItem = 0
private var isScolled = false //是否可以滑动
private var layoutManager: RecyclerView.LayoutManager? = null
/**
* 加载回调方法
* @param countItem 总数量
* @param lastItem 最后显示的position
*/
protected abstract fun onLoading(countItem: Int, lastItem: Int)
override fun onScrollStateChanged(recyclerView: RecyclerView, newState: Int) {
//拖拽或者惯性滑动时isScolled设置为true
isScolled = newState == RecyclerView.SCROLL_STATE_DRAGGING || newState == RecyclerView.SCROLL_STATE_SETTLING
}
override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
if (recyclerView.layoutManager is LinearLayoutManager) {
layoutManager = recyclerView.layoutManager
countItem = layoutManager!!.itemCount
lastItem = (layoutManager as LinearLayoutManager?)!!.findLastCompletelyVisibleItemPosition()
}
if (isScolled && countItem != lastItem && lastItem == countItem - 1) {
onLoading(countItem, lastItem)
}
}
}
//每项不同类型的视图实体
data class ItemBindView<T:Any>(val itemLayout:Int,val setItemValue: ((holder: JsonViewHolder, data: T) -> Unit)?)
//默认的下拉视图类型
class FotterItem()
//返回的数据对象
class ListData{
var count:Int = 0
var data:MutableList<Any> = mutableListOf()
}
//上拉，下拉初始化类
class RefreshListView(val refreshLayout: SwipeRefreshLayout,val recyclerView:RecyclerView){
var pageSize = 20
var page = 1
var count = 0
var datas:MutableList<Any> = mutableListOf()
var onBefor:((isRefresh:Boolean)->Unit)? = null
var onProcess:((isRefresh:Boolean)->ListData)? = null
var onComplet:((isRefresh:Boolean)->Unit)? = null
val context:Context = recyclerView.context
private var registers:MutableMap<Any,Any> = mutableMapOf()
private var types:MutableList<Any> = mutableListOf()
private fun notifyDataSetChanged(){
recyclerView.adapter?.notifyDataSetChanged()
}
init {
//下拉刷新的圆圈是否显示
refreshLayout.apply {
isRefreshing = false
setColorSchemeResources(
android.R.color.holo_blue_light,
android.R.color.holo_red_light,
android.R.color.holo_orange_light
)
setProgressBackgroundColorSchemeResource(android.R.color.white)
setOnRefreshListener {
start(true)
}
}
recyclerView.apply {
addOnScrollListener(object : onLoadMoreListener() {
override fun onLoading(countItem: Int, lastItem: Int) {
if (page * pageSize < count) {
start(false)
}
}
})
adapter = object : RecyclerView.Adapter<JsonViewHolder>() {
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): JsonViewHolder {
val itemBindView = itemBindView(viewType)
val view: View =
LayoutInflater.from(context).inflate(itemBindView.itemLayout, parent, false)
return JsonViewHolder(view)
}
override fun getItemCount(): Int {
return datas.size
}
/**
* 获取itemBindView
*/
private fun itemBindView(viewType: Int): ItemBindView<Any> {
val clas = types[viewType]
val itemBindView = registers[clas] as ItemBindView<Any>
return itemBindView
}
override fun onBindViewHolder(holder: JsonViewHolder, position: Int) {
if(position == 19){
Log.i("xiaochangyan",position.toString())
}
val itemBindView = itemBindView(getItemViewType(position))
val json = datas[position]
if(JSON.toJSON(json) is JSONObject)
holder.initJsonValue(JSON.toJSON(json) as JSONObject)
itemBindView.setItemValue?.invoke(holder, json)
}
override fun getItemViewType(position: Int): Int {
val data = datas[position]
val clas = data::class.java
return types.indexOf(clas)
}
}
}
register(FotterItem::class.java,R.layout.foot_layout,null)
}
private fun start(isRefresh: Boolean){
onBefor?.invoke(isRefresh)
//更正页脚
if(isRefresh){
page = 1
}else{
page+=1
}
GlobalScope.launch(Dispatchers.IO){
var list:ListData? = null
try {
list = onProcess?.invoke(isRefresh)
}catch (e:java.lang.Exception){
e.printStackTrace()
}
withContext(Dispatchers.Main){
refreshLayout.isRefreshing = false
list?.let {
count = it.count//设置记录条数
if(isRefresh){
datas.clear()
}else{
if(datas.last() is FotterItem){
datas.removeAt(datas.lastIndex)
}
}
datas.addAll(it.data)
if (page * pageSize < count) {
datas.add(FotterItem())
}
notifyDataSetChanged()
}
onComplet?.invoke(isRefresh)
}
}
}
fun <T:Any> register(clas:Class<T>,itemLayout:Int,setItemValue: ((holder: JsonViewHolder, data: T) -> Unit)?){
registers[clas] = ItemBindView(itemLayout,setItemValue)
types.add(clas)
}
}
/**
* 统一一个以json为实体的ViewHolder
*/
class JsonViewHolder(view: View) : RecyclerView.ViewHolder(view) {
val map = mutableMapOf<String, View?>()
operator fun get(id:Int): View?{
if(map.containsKey(id.toString())){
return map[id.toString()]
}
val view = itemView.findViewById<View?>(id)
map[id.toString()] = view
return view
}
operator fun get(tag:String): View?{
if(map.containsKey(tag)){
return map[tag]
}
val view = itemView.findViewWithTag<View?>(tag) ?: return null
map[tag] = view
return view
}
operator fun set(tag:String,value:String){
val view: View = this[tag] ?: return
when{
view is TextView -> view.text = value
view is EditText -> view.setText(value)
}
}
fun initJsonValue(jsonObject: JSONObject){
for (key in jsonObject.keys){
if(this[key] ==null)continue
this[key] = when{jsonObject[key]==null->"" else ->jsonObject[key].toString()}
}
}
}
/**
* 简单的适配器扩展
*/
fun RecyclerView.initAdapter(list: JSONArray, layout:Int, setItemValue: ((holder: JsonViewHolder, data: JSONObject) -> Unit)?){
this.adapter = object :RecyclerView.Adapter<JsonViewHolder>(){
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): JsonViewHolder {
val view: View = LayoutInflater.from(this@initAdapter.context).inflate(layout, parent, false)
return JsonViewHolder(view)
}
override fun getItemCount(): Int {
return list.size
}
override fun onBindViewHolder(holder: JsonViewHolder, position: Int) {
val json = list.getJSONObject(position)
holder.initJsonValue(json)
setItemValue?.invoke(holder,json)
}
}
}
/**
* 简单的适配器扩展
*/
fun <T> RecyclerView.initAdapter(list: MutableList<T>, layout:Int, setItemValue: ((holder: JsonViewHolder, data: T) -> Unit)?){
this.adapter = object :RecyclerView.Adapter<JsonViewHolder>(){
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): JsonViewHolder {
val view: View = LayoutInflater.from(this@initAdapter.context).inflate(layout, parent, false)
return JsonViewHolder(view)
}
override fun getItemCount(): Int {
return list.size
}
override fun onBindViewHolder(holder: JsonViewHolder, position: Int) {
val json = list.get(position)
holder.initJsonValue(JSON.toJSON(json) as JSONObject)
setItemValue?.invoke(holder,json)
}
}
}
fun RecyclerView.notifyDataSetChanged(){
this.adapter?.notifyDataSetChanged()
}
其他资源
//api
@GET("WGHQ.PayTest/CYPosApi/getList")
fun getList(@Query("page")page:Int,@Query("pageSize")pageSize:Int):Deferred<ListData>
//itemLayout
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="@+id/textView"
android:layout_width="match_parent"
android:gravity="center"
android:layout_height="50dp"/>
<View style="@style/MMViewLine"/>
</LinearLayout>
