我有一个名为“ ExpView”的活动，其中有两个RecyclerViews。在一个带有Adapter类“ ExpenseViewAdapter”的recyclerView中，我有两个ViewHolder：一个加载所有费用数据，另一个ViewHolder出现在第一个ViewHolder的末尾以显示总费用金额。
在带有自定义适配器“ DateViewAdapter”的第二个recyclerView中，我加载旅行日期以及水平显示在顶部的日期。
两个Recyclerviews均在ViewExp活动开始时加载。现在，我想要的是，当用户单击DateViewAdapter类中的日期/日期时，另一个recyclerview将根据所选日期加载费用数据。
我正在使用“房间持久性”数据库来存储和获取费用信息。所有这些都发生在ViewExp活动中。
现在，请向我展示一种将代码合并到DateViewAdapter类中的方法，以便当用户单击日期/日期时，它将位置数据发送到ViewExp类并调用“ db.userDao（）。findByDate（startDate）” ”方法，并将其传递给“ travelViewRV.adapter = ExpenseViewAdapter（myExp，total）”方法。
以下是相关类别中的代码：
ViewExp类
package ksk.com.ksktravelexp
import android.arch.persistence.room.Room
import android.arch.persistence.room.migration.Migration
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.support.v7.widget.LinearLayoutManager
import kotlinx.android.synthetic.main.expitemlayout.*
import kotlinx.android.synthetic.main.view_exp.*
import java.time.LocalDate
import java.time.format.DateTimeFormatter
import java.util.*
class ViewExp : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.view_exp)
val db = Room.databaseBuilder(applicationContext, AppDb::class.java, "expDB")
.allowMainThreadQueries().build()
//Delete All Items in DB
// db.userDao().deleteAll()
val startDate = "2018-07-21"
val tripDates = calculateTripDates(7,startDate)
val myExp = db.userDao().findByDate(startDate)
val total = calculateTotalExp(myExp)
travelViewRV.layoutManager = LinearLayoutManager(applicationContext)!!
travelViewRV.adapter = ExpenseViewAdapter(myExp, total)
dayDateRV.layoutManager = LinearLayoutManager(applicationContext,LinearLayoutManager.HORIZONTAL,false)
dayDateRV.adapter = DateViewAdapter(tripDates)
}
private fun calculateTotalExp(expList: MutableList<Expense>): Int {
var total: Int = 0
for (i in 0 until expList.size) {
total += expList[i].amount
}
return total
}
fun calculateTripDates(numOfDays:Int, startDate:String):MutableList<String>{
val dayOne = LocalDate.parse(startDate,DateTimeFormatter.ofPattern("yyyy-MM-dd"))
val tripDates = mutableListOf<String>()
for (i in 0 until numOfDays){
val nextDate = dayOne.plusDays(i.toLong())
tripDates.add(nextDate.format(DateTimeFormatter.ofPattern("MMM dd")))
}
return tripDates
}
}
ExpenseViewAdapter类
package ksk.com.ksktravelexp
import android.support.v7.widget.RecyclerView
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import kotlinx.android.synthetic.main.expitemlayout.view.*
import kotlinx.android.synthetic.main.total_layout.view.*
class ExpenseViewAdapter(val expList: MutableList<Expense>, val totalAmount: Int) : RecyclerView.Adapter<RecyclerView.ViewHolder>() {
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
if (viewType == R.layout.expitemlayout) {
val view = LayoutInflater.from(parent.context)
.inflate(R.layout.expitemlayout, parent, false)
return ExpenseViewAdapter.ExpenseVH(view)
} else {
val view = LayoutInflater.from(parent.context).inflate(R.layout.total_layout, parent, false)
return ExpenseViewAdapter.TotalAmountVH(view)
}
}
override fun getItemViewType(position: Int): Int {
if (position == expList.size) {
return R.layout.total_layout
} else return R.layout.expitemlayout
}
override fun getItemCount(): Int = expList.size + 1
override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
if (holder is ExpenseVH) {
holder.expense.text = expList[position].expense
holder.amount.text = expList[position].amount.toString()
holder.category.text = expList[position].category
} else if (holder is TotalAmountVH) {
// holder.total.text = holder.total.text.toString() + totalAmount.toString() + " BDT"
holder.total.text = holder.total.text.toString() + totalAmount.toString() + " BDT"
}
}
class ExpenseVH(view: View) : RecyclerView.ViewHolder(view) {
val expense = view.expenseTV
val amount = view.amountTV
val category = view.categoryTV
}
class TotalAmountVH(view: View) : RecyclerView.ViewHolder(view) {
val total = view.totalTV
}
}
DateViewAdapter
package ksk.com.ksktravelexp
import android.support.v7.widget.RecyclerView
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.Toast
import kotlinx.android.synthetic.main.date_layout.view.*
class DateViewAdapter(val tripDates:MutableList<String>):RecyclerView.Adapter<DateViewAdapter.ViewHolder>(){
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): DateViewAdapter.ViewHolder{
val view = LayoutInflater.from(parent.context).inflate(R.layout.date_layout,parent,false)
return DateViewAdapter.ViewHolder(view)
}
override fun getItemCount(): Int {
return tripDates.size
}
override fun onBindViewHolder(holder:DateViewAdapter.ViewHolder, position: Int) {
holder.day.text = (position+1).toString()
holder.date.text = tripDates[position]
}
class ViewHolder(view: View): RecyclerView.ViewHolder(view){
val day= view.dayTV
val date = view.dateTV
val dateLayout = view.dateLinearLayout
}
}