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(200)

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。

**My Adapter Code:**
package com.littleboo.brandlogo.Adapters

import android.R
import android.content.Context
import android.content.Intent
import android.graphics.Color
import android.graphics.drawable.ColorDrawable
import android.net.Uri
import android.os.Build
import android.os.VibrationEffect
import android.os.Vibrator
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.view.animation.Animation
import android.view.animation.AnimationUtils
import android.widget.Button
import android.widget.TextView
import android.widget.Toast
import androidx.appcompat.app.AlertDialog
import androidx.core.content.ContextCompat.getSystemService
import androidx.recyclerview.widget.RecyclerView
import com.littleboo.brandlogo.Fragments.QuizFragment
import com.littleboo.brandlogo.MainActivity
import com.littleboo.brandlogo.Models.Question
import com.littleboo.brandlogo.databinding.ActivityMainBinding.inflate
import com.littleboo.brandlogo.databinding.FragmentQuizBinding
import kotlinx.coroutines.NonDisposableHandle.parent

class QuestionAdap(val context: Context, val question: Question) :
RecyclerView.Adapter<QuestionAdap.OptionViewHolder>() {
    var index = 1
    var score = 0
    val animShake: Animation = AnimationUtils.loadAnimation(context, com.littleboo.brandlogo.R.anim.shake)


    private var options: List<String> = listOf(question.option1, question.option2, question.option3, question.option4)

    inner class OptionViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView){
        var optionView = itemView.findViewById<TextView>(com.littleboo.brandlogo.R.id.quiz_option)
    }

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): OptionViewHolder {
        val view = LayoutInflater.from(context).inflate(com.littleboo.brandlogo.R.layout.quizoptions, parent, false)
        return  OptionViewHolder(view)
    }

    override fun onBindViewHolder(holder: OptionViewHolder, position: Int) {
        holder.optionView.text = options[position]
        holder.itemView.setOnClickListener {
            question.userAnswer = options[position]
            notifyDataSetChanged()
        }

        if(question.userAnswer == options[position] && question.userAnswer == question.answer){
            holder.itemView.setBackgroundResource(com.littleboo.brandlogo.R.drawable.option_item_selected_bg)
            score += 10
            Toast.makeText(context,"Score is $score", Toast.LENGTH_SHORT).show()
        }

        else if(question.userAnswer == options[position] && question.userAnswer != question.answer){
            holder.itemView.setBackgroundResource(com.littleboo.brandlogo.R.drawable.wrong_option_item_selected_bg)
            holder.itemView.startAnimation(animShake)
        }

        else{
            holder.itemView.setBackgroundResource(com.littleboo.brandlogo.R.drawable.non_option_item_selected_bg)
        }
    }

    override fun getItemCount(): Int {
        return options.size
    }

}

我的测验片段代码：

package com.littleboo.brandlogo.Fragments

import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.Button
import androidx.fragment.app.Fragment
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import androidx.swiperefreshlayout.widget.CircularProgressDrawable
import com.bumptech.glide.Glide
import com.google.firebase.firestore.FirebaseFirestore
import com.littleboo.brandlogo.Adapters.QuestionAdap
import com.littleboo.brandlogo.Models.Question
import com.littleboo.brandlogo.Models.quizmodel
import com.littleboo.brandlogo.R
import com.littleboo.brandlogo.databinding.FragmentQuizBinding

class QuizFragment : Fragment(){

    lateinit var binding: FragmentQuizBinding
    var quizzes: MutableList<quizmodel>? = null
    private var questions = mutableMapOf<String, Question>()
    private lateinit var mArraylist: ArrayList<Question>
    var index = 1
    private lateinit var mfirestore: FirebaseFirestore
    private lateinit var mrecycler: RecyclerView
    lateinit var myadapter: QuestionAdap

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
    }

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        binding = FragmentQuizBinding.inflate(layoutInflater)
        return binding.root
    }



    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        mrecycler = binding.optionList
        mrecycler.layoutManager
        myadapter = QuestionAdap(requireContext(),Question())


        mArraylist = arrayListOf()
        questions.map { it.key to it.value }.shuffled().toMap()
        setUpFirestore()
        setUpEventListener()
    }
    override fun onDestroy() {
        super.onDestroy()
        mfirestore.terminate()
//        finish()
    }

    private fun setUpEventListener() {

        binding.nextbtn.setOnClickListener {
            index++
            bindViews()
        }

//        binding.btnSubmit.setOnClickListener {
//            Log.d("FINALQUIZ", questions.toString())
//            val intent = Intent(this, ResultActivity::class.java)
//            val json = Gson().toJson(quizzes!![0])
//            intent.putExtra("QUIZ", json)
//            startActivity(intent)
//            finish()
//        }
    }

    private fun setUpFirestore() {
        mfirestore = FirebaseFirestore.getInstance()
        val quizTitle = activity?.intent?.getStringExtra("title")
        if (quizTitle != null) {
            mfirestore.collection("Quizes").whereEqualTo("title", quizTitle)
                .get()
                .addOnSuccessListener {
                    if (it != null && !it.isEmpty) {
                        quizzes = it.toObjects(quizmodel::class.java)
                        questions = quizzes!![0].questions
                        shuffle()
                        bindViews()
                    }

                }
        }
    }

    private fun bindViews() {
//        btnPrevious.visibility = View.GONE
//        binding.btnSubmit.visibility = View.GONE
//        binding.btnNext.visibility = View.GONE

//        if (index == 1) { //first question
//            binding.btnNext.visibility = View.VISIBLE
//        } else if (index == questions!!.size) { // last question
//            binding.btnSubmit.visibility = View.VISIBLE
////            btnPrevious.visibility = View.VISIBLE
//        } else { // Middle
////            btnPrevious.visibility = View.VISIBLE
//            binding.btnNext.visibility = View.VISIBLE
//        }

        val circularProgressDrawable = CircularProgressDrawable(requireContext())
        circularProgressDrawable.strokeWidth = 8f
//        circularProgressDrawable.colorFilter = ("#ac5fe1")
        circularProgressDrawable.centerRadius = 30f
        circularProgressDrawable.start()

        val question = questions!!["question$index"]
        question?.let {
            Glide.with(this).load(it.imagequiz).placeholder(circularProgressDrawable).into(binding.imagequiz)
            val optionAdapter = QuestionAdap(requireContext(), it)
            mrecycler.layoutManager = LinearLayoutManager(requireContext())
            mrecycler.adapter = optionAdapter
            mrecycler.setHasFixedSize(true)
        }
    }

    private fun shuffle() {
        val keys = questions.keys.toMutableList().shuffled()
        val values = questions.values.toMutableList().shuffled()
        keys.forEachIndexed { index, key ->
            questions[key] = values[index]
        }

    }
}

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。

private fun showHideButtonFromAdapter (
        isButtonVisible: Boolean
    ) {
     // set your button visibility according to isButtonVisible value. 
}

步骤2：将方法作为参数从片段传递到适配器

val adapter = YourAdapter(::showHideButtonFromAdapter)
// 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。

class ColorPickerAdapter constructor(
    private val onItemClicked: (Boolean) -> Unit
) : RecyclerView.Adapter<YourAdapter.ViewHolder>() {
    // your other adapter methods here
    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
        onItemClicked.invoke(pass true or false as per your requirement)
        // above invocation will trigger an event in the fragment.
    }
}
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：

class QuestionAdap(val context: Context, val question: Question, fragment: Fragment) :
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：

override fun onBindViewHolder(holder: OptionViewHolder, position: Int) {
        holder.optionView.text = options[position]
        holder.itemView.setOnClickListener {
            question.userAnswer = options[position]
            notifyDataSetChanged()
        }
        //Example
        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：

myadapter = QuestionAdap(requireContext(),Question(), this)
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。

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

myadapter = QuestionAdap(requireContext(),Question()) { boolean ->
 if (boolean) {
  //hide/show
} else {
  //hide/show
}
}
赞(0）分享  回复(0）举报  2022-12-23
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