如何在可扩展列表视图 Kotlin 中获取标题中的子项计数
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【中文标题】如何在可扩展列表视图 Kotlin 中获取标题中的子项计数【英文标题】：How to get child Count in Header in expandable list view Kotlin 【发布时间】：2021-03-29 19:46:25 【问题描述】：enter image description here
如何让孩子的数量与标题中的图片相同。
API 响应：-
data class ToDoListResponse(
val message: String = "",
val success: Int = 0,
val todays_task_list: MutableList<TodaysTask>,
val todays_task_total: Int = 0,
val tomorows_task_list: MutableList<TodaysTask>,
val tomorrow_task_total: Int = 0,
val upcomming_task_list: MutableList<TodaysTask>,
val upcomming_task_total: Int = 0)
data class TodaysTask(
val created_at: String = "",
val description: String = "",
val due_date: String= "",
val is_completed: String= "",
val is_pinned_task: String= "",
val remind_me: String= "",
val task_id: String= "",
var title: String= "",
val updated_at: String= "",
val user_id: String= ""
)
适配器：-
package com.coronation.jackpotplus.adapter
import android.annotation.SuppressLint
import android.app.DatePickerDialog
import android.content.Context
import android.graphics.Typeface
import android.os.Build
import android.util.Log
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.*
import androidx.annotation.RequiresApi
import com.coronation.jackpotplus.R
import com.coronation.jackpotplus.model.CommonResponse
import com.coronation.jackpotplus.model.ToDoListResponse
import com.coronation.jackpotplus.network.ApiClient
import com.coronation.jackpotplus.network.ApiService
import com.coronation.jackpotplus.view.ToDoListActivity
import com.google.android.material.bottomsheet.BottomSheetDialog
import com.google.android.material.textfield.TextInputEditText
import org.jetbrains.anko.layoutInflater
import retrofit2.Call
import retrofit2.Response
import java.text.SimpleDateFormat
import java.time.LocalDate
import java.time.ZoneId
import java.time.format.DateTimeFormatter
import java.util.*
@Suppress("NAME_SHADOWING", "DEPRECATED_IDENTITY_EQUALS")
class CustomExpandableListAdapter(
context: Context,
expandableListTitle: ArrayList<String>,
expandableListDetail: HashMap<String,
MutableList<ToDoListResponse.TodaysTask>>)
: BaseExpandableListAdapter()
private val context: Context
private val expandableListTitle: ArrayList<String>
private val expandableListDetail: HashMap<String, MutableList<ToDoListResponse.TodaysTask>>
private lateinit var edtTitle: TextInputEditText
private lateinit var edtDes: TextInputEditText
private lateinit var dueDate: TextView
private lateinit var txtreminddate: TextView
private lateinit var createAt: String
private lateinit var taskId: String
private var ChildCount: String? = null
private lateinit var dialog: BottomSheetDialog
override fun getChild(listPosition: Int, expandedListPosition: Int): Any
return expandableListDetail[expandableListTitle[listPosition]]?.get(expandedListPosition)!!
override fun getChildId(listPosition: Int, expandedListPosition: Int): Long
return expandedListPosition.toLong()
@RequiresApi(Build.VERSION_CODES.O)
@SuppressLint("InflateParams", "SimpleDateFormat")
override fun getChildView(listPosition: Int, expandedListPosition: Int, isLastChild: Boolean, convertView: View?, parent: ViewGroup?): View
var convertView = convertView
if (convertView == null)
val layoutInflater = context.getSystemService(Context.LAYOUT_INFLATER_SERVICE) as LayoutInflater
convertView = layoutInflater.inflate(R.layout.list_item, null)
val expandedListTextView = convertView?.findViewById(R.id.expandedListItem) as TextView
val expandedItem = convertView.findViewById(R.id.expandedItem) as LinearLayout
val txtDelete = convertView.findViewById(R.id.delete) as FrameLayout
val unpin = convertView.findViewById(R.id.unpin) as FrameLayout
val pin = convertView.findViewById(R.id.pin) as FrameLayout
val complete = convertView.findViewById(R.id.complete) as FrameLayout
val mainPin = convertView.findViewById(R.id.mainPin) as ImageView
val getset = getChild(listPosition, expandedListPosition) as ToDoListResponse.TodaysTask
expandedListTextView.text = getset.title
createAt = getset.created_at
unpin.visibility = View.GONE
if (getset.is_pinned_task == "1")
mainPin.visibility = View.VISIBLE
unpin.visibility = View.VISIBLE
pin.visibility = View.GONE
else
mainPin.visibility = View.GONE
pin.visibility = View.VISIBLE
unpin.setOnClickListener
pinnedtask(getset.task_id)
pin.setOnClickListener
pinnedtask(getset.task_id)
complete.setOnClickListener
markascomplete(getset.task_id)
txtDelete.setOnClickListener
deleteTask(getset.task_id)
expandedItem.setOnClickListener
openTaskDetails()
taskId = getset.task_id
edtTitle.setText(getset.title)
edtDes.setText(getset.description)
dueDate.visibility = View.VISIBLE
txtreminddate.visibility = View.VISIBLE
val dueDate1 = getset.due_date
val sdf = SimpleDateFormat("yyyy-MM-dd")
val date = Date(dueDate1.toLong() * 1000)
dueDate.text = sdf.format(date)
val remindDate = getset.remind_me
val sdf1 = SimpleDateFormat("yyyy-MM-dd")
val date1 = Date(remindDate.toLong() * 1000)
txtreminddate.text = sdf1.format(date1)
return convertView
private fun pinnedtask(taskId: String)
val retIn = ApiClient.client!!.create(ApiService::class.java)
retIn.pintask(taskId).enqueue(object : retrofit2.Callback<CommonResponse>
override fun onResponse(call: Call<CommonResponse>, response: Response<CommonResponse>)
showToast(response.body()?.message)
notifyDataSetChanged()
if (context is ToDoListActivity)
context.tasklistAPI("1")
override fun onFailure(call: Call<CommonResponse>, t: Throwable)
showToast("Shomwthing wents wrong")
)
private fun markascomplete(taskId: String)
val retIn = ApiClient.client!!.create(ApiService::class.java)
retIn.markcomplete(taskId).enqueue(object : retrofit2.Callback<CommonResponse>
override fun onResponse(call: Call<CommonResponse>, response: Response<CommonResponse>)
showToast(response.body()?.message)
notifyDataSetChanged()
if (context is ToDoListActivity)
context.tasklistAPI("1")
override fun onFailure(call: Call<CommonResponse>, t: Throwable)
showToast("Shomwthing wents wrong")
)
private fun deleteTask(taskId: String)
val retIn = ApiClient.client!!.create(ApiService::class.java)
retIn.deteletask(taskId).enqueue(object : retrofit2.Callback<CommonResponse>
override fun onResponse(call: Call<CommonResponse>, response: Response<CommonResponse>)
showToast(response.body()?.message)
notifyDataSetChanged()
if (context is ToDoListActivity)
context.tasklistAPI("1")
override fun onFailure(call: Call<CommonResponse>, t: Throwable)
showToast("Shomwthing wents wrong")
)
@RequiresApi(Build.VERSION_CODES.O)
@SuppressLint("InflateParams")
private fun openTaskDetails()
try
val modalbottomsheet = context.layoutInflater.inflate(R.layout.custom_view_todo, null)
dialog = BottomSheetDialog(context, R.style.DialogStyle)
dialog.setContentView(modalbottomsheet)
edtTitle = dialog.findViewById(R.id.edtTitle)!!
edtDes = dialog.findViewById(R.id.edtDes)!!
dueDate = dialog.findViewById(R.id.dueDate)!!
txtreminddate = dialog.findViewById(R.id.txtreminddate)!!
val imgDatePicker = dialog.findViewById<ImageView>(R.id.imgDatePicker)
val imgDatePickerReminder = dialog.findViewById<ImageView>(R.id.imgDatePickerReminder)
val button = dialog.findViewById<Button>(R.id.Button)
imgDatePicker?.setOnClickListener
showDatePicker(context)
imgDatePickerReminder?.setOnClickListener
showDatePickerForRemind(context)
button?.setOnClickListener
updateTaskAPI()
dialog.show()
catch (e: Exception)
e.printStackTrace()
@RequiresApi(Build.VERSION_CODES.O)
private fun updateTaskAPI()
val l = LocalDate.parse(dueDate.text, DateTimeFormatter.ofPattern("yyyy-MM-dd"))
val dueDateTimestamp = l.atStartOfDay(ZoneId.systemDefault()).toInstant().epochSecond
Toast.makeText(context, dueDateTimestamp.toString(), Toast.LENGTH_SHORT).show()
val l1 = LocalDate.parse(txtreminddate.text, DateTimeFormatter.ofPattern("yyyy-MM-dd"))
val remindMeTimestamp = l1.atStartOfDay(ZoneId.systemDefault()).toInstant().epochSecond
Toast.makeText(context, remindMeTimestamp.toString(), Toast.LENGTH_SHORT).show()
val retIn = ApiClient.client!!.create(ApiService::class.java)
retIn.taskupdate(
createAt,
edtDes.text?.trim().toString(),
dueDateTimestamp.toString(),
remindMeTimestamp.toString(),
taskId, edtTitle.text?.trim().toString(),
"1").enqueue(object : retrofit2.Callback<CommonResponse>
override fun onResponse(call: Call<CommonResponse>, response: Response<CommonResponse>)
if (response.body()!!.success == 1)
dialog.dismiss()
showToast(response.body()?.message)
override fun onFailure(call: Call<CommonResponse>, t: Throwable)
showToast("Something not right, Please try again.")
)
@SuppressLint("InflateParams")
fun showToast(msg: String?)
try
val inflater = context.layoutInflater
val layout = inflater.inflate(R.layout.custom_toast, null)
val text = layout.findViewById<View>(R.id.text) as TextView
text.text = msg
val toast = Toast(context)
toast.duration = Toast.LENGTH_SHORT
toast.view = layout
if (toast.view.isShown)
toast.cancel()
else
toast.show()
catch (e: Exception)
e.printStackTrace()
private fun showDatePickerForRemind(context: Context)
val cal = Calendar.getInstance()
val dateSetListener =
DatePickerDialog.OnDateSetListener _, year, monthOfYear, dayOfMonth ->
cal.set(Calendar.YEAR, year)
cal.set(Calendar.MONTH, monthOfYear)
cal.set(Calendar.DAY_OF_MONTH, dayOfMonth)
val myFormat = "yyyy-MM-dd" // mention the format you need
val sdf = SimpleDateFormat(myFormat, Locale.US)
txtreminddate.visibility = View.VISIBLE
txtreminddate.text = sdf.format(cal.time)
var datepicker: DatePickerDialog? = null
if (txtreminddate.text.isNotBlank())
try
val date: String = txtreminddate.text.trim().toString()
val datearr = date.split("-").toTypedArray()
val yearint = datearr[2].toInt()
val monthint = datearr[1].toInt()
val dateint = datearr[0].toInt()
datepicker = DatePickerDialog(
context,
dateSetListener,
dateint,
monthint - 1,
yearint
)
catch (e: Exception)
e.printStackTrace()
else
try
val calendar = Calendar.getInstance()
val dd = calendar[Calendar.DAY_OF_MONTH]
val mm = calendar[Calendar.MONTH]
val yy = calendar[Calendar.YEAR]
datepicker = DatePickerDialog(context, dateSetListener, dd, mm, yy)
catch (e: Exception)
e.printStackTrace()
datepicker!!.show()
private fun showDatePicker(context: Context)
val cal = Calendar.getInstance()
val dateSetListener =
DatePickerDialog.OnDateSetListener _, year, monthOfYear, dayOfMonth ->
cal.set(Calendar.YEAR, year)
cal.set(Calendar.MONTH, monthOfYear)
cal.set(Calendar.DAY_OF_MONTH, dayOfMonth)
val myFormat = "yyyy-MM-dd" // mention the format you need
val sdf = SimpleDateFormat(myFormat, Locale.US)
dueDate.visibility = View.VISIBLE
dueDate.text = sdf.format(cal.time)
var datepicker: DatePickerDialog? = null
if (dueDate.text.isNotBlank())
try
val date: String = dueDate.text.toString()
val datearr = date.split("-").toTypedArray()
val dateint = datearr[0].toInt()
val monthint = datearr[1].toInt()
val yearint = datearr[2].toInt()
datepicker = DatePickerDialog(
context,
dateSetListener,
yearint,
monthint - 1,
dateint
)
catch (e: java.lang.Exception)
e.printStackTrace()
else
try
val calendar = Calendar.getInstance()
val yy = calendar[Calendar.YEAR]
val mm = calendar[Calendar.MONTH]
val dd = calendar[Calendar.DAY_OF_MONTH]
datepicker = DatePickerDialog(context, dateSetListener, yy, mm, dd)
catch (e: java.lang.Exception)
e.printStackTrace()
datepicker!!.show()
override fun getChildrenCount(listPosition: Int): Int
ChildCount = expandableListDetail[expandableListTitle[listPosition]]?.size.toString()
Log.e("TAG",ChildCount)
return expandableListDetail[expandableListTitle[listPosition]]?.size!!
override fun getGroup(listPosition: Int): Any
return expandableListTitle[listPosition]
override fun getGroupCount(): Int
return expandableListTitle.size
override fun getGroupId(listPosition: Int): Long
return listPosition.toLong()
@SuppressLint("InflateParams")
override fun getGroupView(listPosition: Int, isExpanded: Boolean, convertView: View?, parent: ViewGroup?): View
var convertView: View? = convertView
val listTitle = getGroup(listPosition) as String
if (convertView == null)
val layoutInflater = context.getSystemService(Context.LAYOUT_INFLATER_SERVICE) as LayoutInflater
convertView = layoutInflater.inflate(R.layout.list_group, null)
val listTitleTextView = convertView?.findViewById(R.id.listTitle) as TextView
val listCount = convertView.findViewById(R.id.listCount) as TextView
val arrowicon = convertView.findViewById(R.id.arrowicon) as ImageView
listTitleTextView.setTypeface(null, Typeface.BOLD)
listTitleTextView.text = listTitle
listCount.text = "($ChildCount)"
if (getChildrenCount(listPosition) === 0)
arrowicon.visibility = View.INVISIBLE
else
arrowicon.visibility = View.VISIBLE
arrowicon.setImageResource(if (isExpanded) R.drawable.ic_arrow_up else R.drawable.ic_arrow_down)
return convertView
override fun hasStableIds(): Boolean
return false
override fun isChildSelectable(listPosition: Int, expandedListPosition: Int): Boolean
return true
init
this.context = context
this.expandableListTitle = expandableListTitle
this.expandableListDetail = expandableListDetail
活动：-
fun tasklistAPI(userId: String)
if (isOnline())
llNoInternet.gone()
llLoading.visible()
apiService.todotasklist(userId).enqueue(object :
Callback<ToDoListResponse>
override fun onFailure(call: Call<ToDoListResponse>, t: Throwable)
llLoading.gone()
override fun onResponse(call: Call<ToDoListResponse>, response: Response<ToDoListResponse>)
if (response.isSuccessful)
if (response.body()!!.success == 1)
try
llLoading.gone()
expandableListDetail = HashMap()
val todaytask = response.body()!!.todays_task_list
expandableListTitle = ArrayList()
todaystitle = ArrayList()
todayslist = ArrayList()
Log.e("<>list", todaystitle.toString())
for (i in todaytask.indices)
todaystitle.add(todaytask[i])
val tommrowtask = response.body()!!.tomorows_task_list
val tommorowtitle: MutableList<ToDoListResponse.TodaysTask> = ArrayList()
for (i in tommrowtask.indices)
tommorowtitle.add(tommrowtask[i])
val upcomingtask = response.body()!!.upcomming_task_list
val upcomingtitle: MutableList<ToDoListResponse.TodaysTask> = ArrayList()
for (i in upcomingtask.indices)
upcomingtitle.add(upcomingtask[i])
expandableListTitle.add("Today's Task")
expandableListTitle.add("Tommorow's Task")
expandableListTitle.add("Upcoming Task")
expandableListDetail.put(expandableListTitle[0], todaystitle)
expandableListDetail.put(expandableListTitle[1], tommrowtask)
expandableListDetail.put(expandableListTitle[2], upcomingtask)
Log.e("task", expandableListTitle.get(0) + " = " + expandableListDetail.put(expandableListTitle.get(0), todaystitle))
Log.e("task", expandableListTitle.get(1) + " = " + expandableListDetail.put(expandableListTitle.get(1), tommrowtask))
Log.e("task", expandableListTitle.get(2) + " = " + expandableListDetail.put(expandableListTitle.get(2), upcomingtask))
expandableListAdapter = CustomExpandableListAdapter(activity, expandableListTitle, expandableListDetail)
expandableListView!!.setAdapter(expandableListAdapter)
catch (e: Exception)
e.printStackTrace()
else
llLoading.gone()
)
else
llNoInternet.visible()
这是显示如何将添加数据添加到 hashmap 和可扩展列表视图的代码。 如您所见，有一个可扩展列表视图的哈希图，并且在adaoter中，我将标题从api respose放入，但是listview父级的标题是静态的，而子级中的数据是动态的，因此您可以看到差异
【问题讨论】：
你不能简单地在 recyclerview 中获取列表的大小吗？ 它是一个可扩展的列表视图，所以我必须使用哈希映射设置数据，并且标题是静态的，子来自 api 响应 表示您正在从 api 响应中获取列表？ 是正确的来自api响应的child中的数据 那么您能否简单地从 api 响应中获取列表的大小并将其设置为可扩展的列表视图标题文本 【参考方案1】：您添加了很多代码，但我认为这是唯一对您的问题很重要的代码：-
expandableListTitle.add("Today's Task")
expandableListTitle.add("Tommorow's Task")
expandableListTitle.add("Upcoming Task")
expandableListDetail.put(expandableListTitle[0], todaystitle)
expandableListDetail.put(expandableListTitle[1], tommrowtask)
expandableListDetail.put(expandableListTitle[2], upcomingtask)
Log.e("task", expandableListTitle.get(0) + " = " + expandableListDetail.put(expandableListTitle.get(0), todaystitle))
Log.e("task", expandableListTitle.get(1) + " = " + expandableListDetail.put(expandableListTitle.get(1), tommrowtask))
Log.e("task", expandableListTitle.get(2) + " = " + expandableListDetail.put(expandableListTitle.get(2), upcomingtask))
expandableListAdapter = CustomExpandableListAdapter(activity, expandableListTitle, expandableListDetail)
expandableListView!!.setAdapter(expandableListAdapter)
据我从您在链接中添加的图片了解到，您需要在标题右侧显示子项中存在的元素数量。
您可以做的就是简单地添加列表中存在的元素总数，如下所示：-
expandableListTitle.add("Today's Task ($todaystitle.count())") //.count() gives the total number of elements present in list
它将添加标题为Today's Task (10)\\ here 10 would be the number of elements present in your list。现在你可以简单地以任何你想要的方式格式化
【讨论】：
很高兴能帮助到兄弟，如果对你有帮助，请投票，方便其他人找到。以上是关于如何在可扩展列表视图 Kotlin 中获取标题中的子项计数的主要内容，如果未能解决你的问题，请参考以下文章