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September 28, 2021 13:54
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RecyclerView Kotlin Tutorial Part 4
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<?xml version="1.0" encoding="utf-8"?> | |
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" | |
xmlns:tools="http://schemas.android.com/tools" | |
android:layout_width="match_parent" | |
android:layout_height="match_parent" | |
tools:context=".MainActivity"> | |
<androidx.recyclerview.widget.RecyclerView | |
android:id="@+id/recycler_view" | |
android:layout_width="match_parent" | |
android:layout_height="match_parent" | |
android:layout_above="@id/buttons" | |
android:clipToPadding="false" | |
android:padding="4dp" | |
tools:listitem="@layout/example_item" /> | |
<LinearLayout | |
android:id="@+id/buttons" | |
android:layout_width="match_parent" | |
android:layout_height="wrap_content" | |
android:layout_alignParentBottom="true" | |
android:clipToPadding="true" | |
android:padding="4dp"> | |
<Button | |
android:layout_width="match_parent" | |
android:layout_height="wrap_content" | |
android:layout_weight="1" | |
android:onClick="insertItem" | |
android:text="Insert item" /> | |
<Button | |
android:layout_width="match_parent" | |
android:layout_height="wrap_content" | |
android:layout_weight="1" | |
android:onClick="removeItem" | |
android:text="Remove item" /> | |
</LinearLayout> | |
</RelativeLayout> |
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<?xml version="1.0" encoding="utf-8"?> | |
<androidx.cardview.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android" | |
android:layout_width="match_parent" | |
android:layout_height="wrap_content" | |
android:layout_margin="4dp"> | |
<RelativeLayout | |
android:layout_width="match_parent" | |
android:layout_height="match_parent" | |
android:padding="8dp"> | |
<ImageView | |
android:id="@+id/image_view" | |
android:layout_width="50dp" | |
android:layout_height="50dp" | |
android:layout_marginEnd="8dp" | |
android:src="@drawable/ic_android" /> | |
<TextView | |
android:id="@+id/text_view_1" | |
android:layout_width="wrap_content" | |
android:layout_height="wrap_content" | |
android:layout_toEndOf="@id/image_view" | |
android:text="Line 1" | |
android:textColor="@android:color/black" | |
android:textSize="18sp" | |
android:textStyle="bold" /> | |
<TextView | |
android:id="@+id/text_view_2" | |
android:layout_width="wrap_content" | |
android:layout_height="wrap_content" | |
android:layout_below="@id/text_view_1" | |
android:layout_toEndOf="@id/image_view" | |
android:text="Line 2" /> | |
</RelativeLayout> | |
</androidx.cardview.widget.CardView> |
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package com.codinginflow.recyclerviewexample | |
import android.view.LayoutInflater | |
import android.view.View | |
import android.view.ViewGroup | |
import android.widget.ImageView | |
import android.widget.TextView | |
import androidx.recyclerview.widget.RecyclerView | |
import kotlinx.android.synthetic.main.example_item.view.* | |
class ExampleAdapter( | |
private val exampleList: List<ExampleItem>, | |
private val listener: OnItemClickListener | |
) : | |
RecyclerView.Adapter<ExampleAdapter.ExampleViewHolder>() { | |
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ExampleViewHolder { | |
val itemView = LayoutInflater.from(parent.context).inflate(R.layout.example_item, | |
parent, false) | |
return ExampleViewHolder(itemView) | |
} | |
override fun onBindViewHolder(holder: ExampleViewHolder, position: Int) { | |
val currentItem = exampleList[position] | |
holder.imageView.setImageResource(currentItem.imageResource) | |
holder.textView1.text = currentItem.text1 | |
holder.textView2.text = currentItem.text2 | |
} | |
override fun getItemCount() = exampleList.size | |
inner class ExampleViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView), | |
View.OnClickListener { | |
val imageView: ImageView = itemView.image_view | |
val textView1: TextView = itemView.text_view_1 | |
val textView2: TextView = itemView.text_view_2 | |
init { | |
itemView.setOnClickListener(this) | |
} | |
override fun onClick(v: View?) { | |
val position = adapterPosition | |
if (position != RecyclerView.NO_POSITION) { | |
listener.onItemClick(position) | |
} | |
} | |
} | |
interface OnItemClickListener { | |
fun onItemClick(position: Int) | |
} | |
} |
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package com.codinginflow.recyclerviewexample | |
data class ExampleItem(val imageResource: Int, var text1: String, var text2: String) |
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package com.codinginflow.recyclerviewexample | |
import androidx.appcompat.app.AppCompatActivity | |
import android.os.Bundle | |
import android.view.View | |
import android.widget.Toast | |
import androidx.recyclerview.widget.LinearLayoutManager | |
import kotlinx.android.synthetic.main.activity_main.* | |
import kotlin.random.Random | |
class MainActivity : AppCompatActivity(), ExampleAdapter.OnItemClickListener { | |
private val exampleList = generateDummyList(500) | |
private val adapter = ExampleAdapter(exampleList, this) | |
override fun onCreate(savedInstanceState: Bundle?) { | |
super.onCreate(savedInstanceState) | |
setContentView(R.layout.activity_main) | |
recycler_view.adapter = adapter | |
recycler_view.layoutManager = LinearLayoutManager(this) | |
recycler_view.setHasFixedSize(true) | |
} | |
fun insertItem(view: View) { | |
val index = Random.nextInt(8) | |
val newItem = ExampleItem( | |
R.drawable.ic_android, | |
"New item at position $index", | |
"Line 2" | |
) | |
exampleList.add(index, newItem) | |
adapter.notifyItemInserted(index) | |
} | |
fun removeItem(view: View) { | |
val index = Random.nextInt(8) | |
exampleList.removeAt(index) | |
adapter.notifyItemRemoved(index) | |
} | |
override fun onItemClick(position: Int) { | |
Toast.makeText(this, "Item $position clicked", Toast.LENGTH_SHORT).show() | |
val clickedItem = exampleList[position] | |
clickedItem.text1 = "Clicked" | |
adapter.notifyItemChanged(position) | |
} | |
private fun generateDummyList(size: Int): ArrayList<ExampleItem> { | |
val list = ArrayList<ExampleItem>() | |
for (i in 0 until size) { | |
val drawable = when (i % 3) { | |
0 -> R.drawable.ic_android | |
1 -> R.drawable.ic_audio | |
else -> R.drawable.ic_sun | |
} | |
val item = ExampleItem(drawable, "Item $i", "Line 2") | |
list += item | |
} | |
return list | |
} | |
} |
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