如何从Kotlin中的一个片段调用adapter中的一个方法？

xuo3flqw  于 2022-12-23  发布在  Kotlin
关注(0)|答案(3)|浏览(228)

我一直试图调用一个函数从片段到适配器，但我不能接近它的权利。我想看不见的按钮出现在片段从适配器。

  1. **My Adapter Code:**
  2. package com.littleboo.brandlogo.Adapters
  4. import android.R
  5. import android.content.Context
  6. import android.content.Intent
  7. import android.graphics.Color
  8. import android.graphics.drawable.ColorDrawable
  9. import android.net.Uri
  10. import android.os.Build
  11. import android.os.VibrationEffect
  12. import android.os.Vibrator
  13. import android.view.LayoutInflater
  14. import android.view.View
  15. import android.view.ViewGroup
  16. import android.view.animation.Animation
  17. import android.view.animation.AnimationUtils
  18. import android.widget.Button
  19. import android.widget.TextView
  20. import android.widget.Toast
  21. import androidx.appcompat.app.AlertDialog
  22. import androidx.core.content.ContextCompat.getSystemService
  23. import androidx.recyclerview.widget.RecyclerView
  24. import com.littleboo.brandlogo.Fragments.QuizFragment
  25. import com.littleboo.brandlogo.MainActivity
  26. import com.littleboo.brandlogo.Models.Question
  27. import com.littleboo.brandlogo.databinding.ActivityMainBinding.inflate
  28. import com.littleboo.brandlogo.databinding.FragmentQuizBinding
  29. import kotlinx.coroutines.NonDisposableHandle.parent
  31. class QuestionAdap(val context: Context, val question: Question) :
  32. RecyclerView.Adapter<QuestionAdap.OptionViewHolder>() {
  33.     var index = 1
  34.     var score = 0
  35.     val animShake: Animation = AnimationUtils.loadAnimation(context, com.littleboo.brandlogo.R.anim.shake)
  38.     private var options: List<String> = listOf(question.option1, question.option2, question.option3, question.option4)
  40.     inner class OptionViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView){
  41.         var optionView = itemView.findViewById<TextView>(com.littleboo.brandlogo.R.id.quiz_option)
  42.     }
  44.     override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): OptionViewHolder {
  45.         val view = LayoutInflater.from(context).inflate(com.littleboo.brandlogo.R.layout.quizoptions, parent, false)
  46.         return  OptionViewHolder(view)
  47.     }
  49.     override fun onBindViewHolder(holder: OptionViewHolder, position: Int) {
  50.         holder.optionView.text = options[position]
  51.         holder.itemView.setOnClickListener {
  52.             question.userAnswer = options[position]
  53.             notifyDataSetChanged()
  54.         }
  56.         if(question.userAnswer == options[position] && question.userAnswer == question.answer){
  57.             holder.itemView.setBackgroundResource(com.littleboo.brandlogo.R.drawable.option_item_selected_bg)
  58.             score += 10
  59.             Toast.makeText(context,"Score is $score", Toast.LENGTH_SHORT).show()
  60.         }
  62.         else if(question.userAnswer == options[position] && question.userAnswer != question.answer){
  63.             holder.itemView.setBackgroundResource(com.littleboo.brandlogo.R.drawable.wrong_option_item_selected_bg)
  64.             holder.itemView.startAnimation(animShake)
  65.         }
  67.         else{
  68.             holder.itemView.setBackgroundResource(com.littleboo.brandlogo.R.drawable.non_option_item_selected_bg)
  69.         }
  70.     }
  72.     override fun getItemCount(): Int {
  73.         return options.size
  74.     }
  76. }

我的测验片段代码：

  1. package com.littleboo.brandlogo.Fragments
  3. import android.os.Bundle
  4. import android.view.LayoutInflater
  5. import android.view.View
  6. import android.view.ViewGroup
  7. import android.widget.Button
  8. import androidx.fragment.app.Fragment
  9. import androidx.recyclerview.widget.LinearLayoutManager
  10. import androidx.recyclerview.widget.RecyclerView
  11. import androidx.swiperefreshlayout.widget.CircularProgressDrawable
  12. import com.bumptech.glide.Glide
  13. import com.google.firebase.firestore.FirebaseFirestore
  14. import com.littleboo.brandlogo.Adapters.QuestionAdap
  15. import com.littleboo.brandlogo.Models.Question
  16. import com.littleboo.brandlogo.Models.quizmodel
  17. import com.littleboo.brandlogo.R
  18. import com.littleboo.brandlogo.databinding.FragmentQuizBinding
  20. class QuizFragment : Fragment(){
  22.     lateinit var binding: FragmentQuizBinding
  23.     var quizzes: MutableList<quizmodel>? = null
  24.     private var questions = mutableMapOf<String, Question>()
  25.     private lateinit var mArraylist: ArrayList<Question>
  26.     var index = 1
  27.     private lateinit var mfirestore: FirebaseFirestore
  28.     private lateinit var mrecycler: RecyclerView
  29.     lateinit var myadapter: QuestionAdap
  31.     override fun onCreate(savedInstanceState: Bundle?) {
  32.         super.onCreate(savedInstanceState)
  33.     }
  35.     override fun onCreateView(
  36.         inflater: LayoutInflater, container: ViewGroup?,
  37.         savedInstanceState: Bundle?
  38.     ): View? {
  39.         binding = FragmentQuizBinding.inflate(layoutInflater)
  40.         return binding.root
  41.     }
  45.     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
  46.         super.onViewCreated(view, savedInstanceState)
  47.         mrecycler = binding.optionList
  48.         mrecycler.layoutManager
  49.         myadapter = QuestionAdap(requireContext(),Question())
  52.         mArraylist = arrayListOf()
  53.         questions.map { it.key to it.value }.shuffled().toMap()
  54.         setUpFirestore()
  55.         setUpEventListener()
  56.     }
  57.     override fun onDestroy() {
  58.         super.onDestroy()
  59.         mfirestore.terminate()
  60. //        finish()
  61.     }
  63.     private fun setUpEventListener() {
  65.         binding.nextbtn.setOnClickListener {
  66.             index++
  67.             bindViews()
  68.         }
  70. //        binding.btnSubmit.setOnClickListener {
  71. //            Log.d("FINALQUIZ", questions.toString())
  72. //            val intent = Intent(this, ResultActivity::class.java)
  73. //            val json = Gson().toJson(quizzes!![0])
  74. //            intent.putExtra("QUIZ", json)
  75. //            startActivity(intent)
  76. //            finish()
  77. //        }
  78.     }
  80.     private fun setUpFirestore() {
  81.         mfirestore = FirebaseFirestore.getInstance()
  82.         val quizTitle = activity?.intent?.getStringExtra("title")
  83.         if (quizTitle != null) {
  84.             mfirestore.collection("Quizes").whereEqualTo("title", quizTitle)
  85.                 .get()
  86.                 .addOnSuccessListener {
  87.                     if (it != null && !it.isEmpty) {
  88.                         quizzes = it.toObjects(quizmodel::class.java)
  89.                         questions = quizzes!![0].questions
  90.                         shuffle()
  91.                         bindViews()
  92.                     }
  94.                 }
  95.         }
  96.     }
  98.     private fun bindViews() {
  99. //        btnPrevious.visibility = View.GONE
  100. //        binding.btnSubmit.visibility = View.GONE
  101. //        binding.btnNext.visibility = View.GONE
  103. //        if (index == 1) { //first question
  104. //            binding.btnNext.visibility = View.VISIBLE
  105. //        } else if (index == questions!!.size) { // last question
  106. //            binding.btnSubmit.visibility = View.VISIBLE
  107. ////            btnPrevious.visibility = View.VISIBLE
  108. //        } else { // Middle
  109. ////            btnPrevious.visibility = View.VISIBLE
  110. //            binding.btnNext.visibility = View.VISIBLE
  111. //        }
  113.         val circularProgressDrawable = CircularProgressDrawable(requireContext())
  114.         circularProgressDrawable.strokeWidth = 8f
  115. //        circularProgressDrawable.colorFilter = ("#ac5fe1")
  116.         circularProgressDrawable.centerRadius = 30f
  117.         circularProgressDrawable.start()
  119.         val question = questions!!["question$index"]
  120.         question?.let {
  121.             Glide.with(this).load(it.imagequiz).placeholder(circularProgressDrawable).into(binding.imagequiz)
  122.             val optionAdapter = QuestionAdap(requireContext(), it)
  123.             mrecycler.layoutManager = LinearLayoutManager(requireContext())
  124.             mrecycler.adapter = optionAdapter
  125.             mrecycler.setHasFixedSize(true)
  126.         }
  127.     }
  129.     private fun shuffle() {
  130.         val keys = questions.keys.toMutableList().shuffled()
  131.         val values = questions.values.toMutableList().shuffled()
  132.         keys.forEachIndexed { index, key ->
  133.             questions[key] = values[index]
  134.         }
  136.     }
  137. }

我尝试在适配器中调用片段，如下所示：QuizFragment（）.绑定.btnxt.可见性=查看.可见
在BindViewHolder函数中。
谢谢

kotlin

3条答案

按热度按时间
ergxz8rk

ergxz8rk1#

你可以在你的片段中使用Kotlin的回调函数，它将被传递到你的适配器中，所以每当你从适配器调用回调函数时，它将在你的片段中被触发。
第一步：在你的代码片段中创建一个类似下面的方法。

  1. private fun showHideButtonFromAdapter (
  2.         isButtonVisible: Boolean
  3.     ) {
  4.      // set your button visibility according to isButtonVisible value. 
  5. }

步骤2：将方法作为参数从片段传递到适配器

  1. val adapter = YourAdapter(::showHideButtonFromAdapter)
  2. // set above adapter in your recycler view.

步骤3：在适配器中调用回调函数，如下所示。

  1. class ColorPickerAdapter constructor(
  2.     private val onItemClicked: (Boolean) -> Unit
  3. ) : RecyclerView.Adapter<YourAdapter.ViewHolder>() {
  4.     // your other adapter methods here
  5.     override fun onBindViewHolder(holder: ViewHolder, position: Int) {
  6.         onItemClicked.invoke(pass true or false as per your requirement)
  7.         // above invocation will trigger an event in the fragment.
  8.     }
  9. }
展开查看全部
赞(0）分享  回复(0）举报  2022-12-23
w3nuxt5m

w3nuxt5m2#

在适配器中需要有片段的示例，因此请将其更改为：

  1. class QuestionAdap(val context: Context, val question: Question, fragment: Fragment) :
  2. RecyclerView.Adapter<QuestionAdap.OptionViewHolder>() {

然后，您只需在适配器中编写fragment即可调用片段，如下所示：

  1. override fun onBindViewHolder(holder: OptionViewHolder, position: Int) {
  2.         holder.optionView.text = options[position]
  3.         holder.itemView.setOnClickListener {
  4.             question.userAnswer = options[position]
  5.             notifyDataSetChanged()
  6.         }
  7.         //Example
  8.         fragment.shuffle()

当你创建它的适配器时，你需要发送这个片段示例，所以在你的片段中使用：

  1. myadapter = QuestionAdap(requireContext(),Question(), this)
展开查看全部
赞(0）分享  回复(0）举报  2022-12-23
lsmepo6l

lsmepo6l3#

你可以使用Kotlinlambda函数来实现它。

  1. class QuestionAdap(val context: Context, val question: Question, var onItemClicked: ((boolean) -> Unit))

在适配器中所需的位置和片段中调用onItemClicked

  1. myadapter = QuestionAdap(requireContext(),Question()) { boolean ->
  2.  if (boolean) {
  3.   //hide/show
  4. } else {
  5.   //hide/show
  6. }
  7. }
赞(0）分享  回复(0）举报  2022-12-23
我来回答

相关问题

    查看更多

    热门标签

    更多
    JavaquerypythonNode开发语言requestUtil数据库Table后端算法LoggerMessageElementParser

    最新问答

    更多
    • 蜀ICP备13028337号-1 大数据知识库 https://www.saoniuhuo.com © All rights reserved
    • 本站内容来源互联网,如果侵犯您的权益请联系我们删除, 联系方式：448109455@qq.com