Справочник рыбака на Kotlin: Урок 10

MainActivity.kt

import android.content.res.TypedArray
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.MenuItem
import android.widget.Toast
import androidx.recyclerview.widget.LinearLayoutManager
import com.google.android.material.navigation.NavigationView
import kotlinx.android.synthetic.main.activity_main.*
import kotlinx.android.synthetic.main.main_content.*



class MainActivity : AppCompatActivity(), NavigationView.OnNavigationItemSelectedListener{
       var adapter: MyAdapter? = null
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        nav_view.setNavigationItemSelectedListener (this)

        var list = ArrayList<ListItem>()

        list.addAll(fillArras(resources.getStringArray(R.array.fish),
            resources.getStringArray(R.array.fish_content),getImageId(R.array.fish_image_array)))
        rcView.hasFixedSize()
        rcView.layoutManager = LinearLayoutManager(this)
        adapter = MyAdapter(list,this)
        rcView.adapter = adapter


    }

    override fun onNavigationItemSelected(item: MenuItem): Boolean {

        when(item.itemId){

            R.id.id_fish ->
            {
                Toast.makeText(this,"Id fish",Toast.LENGTH_SHORT).show()
                adapter?.updateAdapter(fillArras(resources.getStringArray(R.array.fish),
                    resources.getStringArray(R.array.fish_content),getImageId(R.array.fish_image_array)))

            }
            R.id.id_na ->
            {
                Toast.makeText(this,"Id na",Toast.LENGTH_SHORT).show()
                adapter?.updateAdapter(fillArras(resources.getStringArray(R.array.na),
                    resources.getStringArray(R.array.na_content),getImageId(R.array.na_image_array)))

            }
            R.id.id_sna -> Toast.makeText(this,"Id sna",Toast.LENGTH_SHORT).show()
            R.id.id_history -> Toast.makeText(this,"Id history",Toast.LENGTH_SHORT).show()
        }

        return true
    }
    fun fillArras(titleArray:Array<String>,contentArray:Array<String>,imageArray:IntArray):List<ListItem>
    {
       var listItemArray = ArrayList<ListItem>()
        for(n in 0..titleArray.size - 1)
        {
            var listItem = ListItem(imageArray[n],titleArray[n],contentArray[n])
            listItemArray.add(listItem)
        }
        return listItemArray
    }

    fun getImageId(imageArrayId:Int):IntArray
    {
        var tArray:TypedArray = resources.obtainTypedArray(imageArrayId)
        val count = tArray.length()
        val ids = IntArray(count)
        for(i in ids.indices)
        {
            ids[i] = tArray.getResourceId(i,0)
        }
        tArray.recycle()
        return ids
    }

}

MyAdapter.kt

import android.content.Context
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.ImageView
import android.widget.TextView
import android.widget.Toast
import androidx.recyclerview.widget.RecyclerView

class MyAdapter (listArray:ArrayList<ListItem>, context: Context): RecyclerView.Adapter<MyAdapter.ViewHolder>()  {
      var listArrarR = listArray
      var contextR = context


    class ViewHolder(view: View): RecyclerView.ViewHolder(view) {
         val tvTitle = view.findViewById<TextView>(R.id.tvTitle)
         val tvContent = view.findViewById<TextView>(R.id.tvContent)
         val im = view.findViewById<ImageView>(R.id.im)

        fun bind( listItem:ListItem, context: Context)
        {
            tvTitle.text = listItem.titleText
            tvContent.text = listItem.contentText
            im.setImageResource(listItem.image_id)
            itemView.setOnClickListener(){
                Toast.makeText(context,"Pressed : ${tvTitle.text}",Toast.LENGTH_SHORT).show()
            }
        }

    }

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
        val inflater = LayoutInflater.from(contextR)
        return ViewHolder(inflater.inflate(R.layout.item_layout,parent,false))
    }

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

    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
       var listItem = listArrarR.get(position)
        holder.bind(listItem,contextR)
    }

    fun updateAdapter(listArray : List<ListItem>)
    {
        listArrarR.clear()
        listArrarR.addAll(listArray)
        notifyDataSetChanged()
    }
}


array.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>

<string-array name="fish">
    <item>Сом</item>
    <item>Налим</item>
    <item>Щука</item>
    <item>Карась</item>
</string-array>
    <string-array name="fish_content">
        <item>ырвыпаывпрыврпрырпыекр</item>
        <item>ыкерыкерыкернывкернывкерыкервкервкерык</item>
        <item>ыкерыкерыкрыкгеуновеновенове</item>
        <item>веновкеоновеновеноеновено</item>
    </string-array>
    <array name="fish_image_array">
        <item>@drawable/som</item>
        <item>@drawable/nalim</item>
        <item>@drawable/shuca</item>
        <item>@drawable/caras</item>
    </array>
    <string-array name="na">
        <item>м</item>
        <item>им</item>
        <item>ука</item>
        <item>арась</item>
    </string-array>
    <string-array name="na_content">
        <item>ы</item>
        <item>ыкерык</item>
        <item>ы</item>
        <item>ве</item>
    </string-array>
    <array name="na_image_array">
        <item>@drawable/nalim</item>
        <item>@drawable/som</item>
        <item>@drawable/caras</item>
        <item>@drawable/shuca</item>

    </array>

</resources>

3 комментария для “Справочник рыбака на Kotlin: Урок 10”

  1. Юрий

    Здравствуйте при создании переменной var adapter = MyAdapter? = null, подчеркивает красным :Classifier ‘MyAdapter’ does not have a companion object, and thus must be initialized here. в чем может быть причина? Спасибо

    Ответить

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