この記事はkotlin recyclerviewを明確にします。 kotlin recyclerviewを探している場合は、MississippiLiteracyAssociationに行き、このRECYCLERVIEW – Android Fundamentalsの記事でkotlin recyclerviewを分析しましょう。
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kotlin recyclerviewに関連するコンテンツ
このビデオでは、Android の非常に重要なビューである RecyclerView について学習します。 非常に効率的な方法であらゆる種類のリストを実装するために使用されます。 ⭐ 将来の仕事のための証明書を取得 ⭐ 数え切れないほどの時間を節約 ⭐ 30 日間 100% 返金保証 ⭐ プロの Android デベロッパーになりましょう: 💻 個人的にコードをレビューし、個別のフィードバックを提供させてください。あなたは将来の幸運です: Instagram の通常の Android チュートリアル: GitHub をチェックしてください:
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kotlin recyclerviewに関連するいくつかの提案
#RECYCLERVIEW #Android #Fundamentals。
android studio,android,kotlin,recyclerview,recycling,efficient,programming,tutorial,beginner,newbie,ui,ux,xml,layout,coding,development,app。
RECYCLERVIEW – Android Fundamentals。
kotlin recyclerview。
kotlin recyclerviewの知識を持って、msliteracy.orgがあなたにそれがあなたに役立つことを望んで、あなたがより多くの情報と新しい知識を持っているのを助けることを願っています。。 MississippiLiteracyAssociationのkotlin recyclerviewについての記事を読んでくれて心から感謝します。
Use my comment to express your sadness about onBindViewHoler in 2023 🙁
thanks a lot you explain this unit very good
Thank you so much this was really simplified amazingly
you're explanation was very detailed, but i found out this method was only possible in my case using a depreciated method of using 'kotlin-android-extensions' as plugin for gradle. i hope you can redo it in the new updated method as of 2023.
holder can't reference my view items inside the onBIndViewHolder. I can't import the item_todo.view. i can't find it.
This is fantastic. Thank you so much!
if i had a delete button on the template then how would i attach a function to each one?
Succinct
HI! How delete item (position) ?
Hi there! In MainActivity rvTodos is not identified. Anyone has an idea about how to fix it? I applied a suggestion posted below by someone who watched this video. This suggestion did not work for me. Also, in the the clicklistener Todo [line: Todo(title, false)] is not identified either. Thanks.
Hey how can i remove the todo list after i check the checkbox?
Wow this is really step by step love this.
Hi Philipp is this playlist for beginners to android or for java devs transitioning to kotlin, cause i'm the former with just knowledge of kotlin bascis
Hi, I am just starting out with the tutorials. I can see that the recycler view state/ items in the todo list are not save when I reopen the app. Is there a way to go about this?
this is a snippet from my working recyclerview app (not related to this video)
when ur experiencing adapter not attached message at logcat, initialize RecyclerView variable at OnCreate() like the one shown below
private lateinit var binding:ActivityGameSaveBinding
private lateinit var itemRV: RecyclerView
(these variables are declared in Activity)
…
binding = ActivityGameSaveBinding.inflate(layoutInflater)
setContentView(binding.root)
…
itemRV = binding.gamesavelist
itemRV.setHasFixedSize(true)
itemRV.setLayoutManager(
LinearLayoutManager(
this,
LinearLayoutManager.VERTICAL,
false
)
)
…
val itemAdapter = ItemAdapter(itemList as ArrayList<GameDAO>)
itemRV.setAdapter(itemAdapter)
hope it helps
the learning curve is steep on this one….
what is """tvTitle""" ? it's not working and we didn't declare it before !!!
Clear explanation. Congrats !
Can you do updates as video or as comment under the video, because there are some deprecated usages.
I messed up somewhere, when I run the app, the ,list does not show up nor the recycler view item
Very Clean Explaination Thanks
Amazing Tutorial. Keep up the good work man!
I post my code here for someone have problem with adapter. Hope it can be help you <3
1. In grade, you insert this line
buildFeatures {
viewBinding true
}
2. In Adapter
2.1. TodoViewHolder
class TodoViewHolder(val binding: ItemTodoBinding) : RecyclerView.ViewHolder(binding.root)
2.2 – onCreateViewHolder
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): TodoViewHolder {
val binding = ItemTodoBinding.inflate(LayoutInflater.from(parent.context), parent, false)
return TodoViewHolder(binding)
}
2.3 – onBindViewHolder
override fun onBindViewHolder(holder: TodoViewHolder, position: Int) {
with(holder) {
with(todos[position]) {
binding.tvTitle.text = this.title
binding.cbDone.isChecked = this.isChecked
}
}
}
3. I believe that you can handle MainActivity by yourself 🤘
hey Phillip 🙂 if you also had a Spinner with todo category how would you declare that in the data class?
is there a java version of this?
Also there is problem on 20:21. You need add RecyclerView, Button and TextView to use it. So in your MainActivity add code like this.
CODE:
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
var todoList = mutableListOf(
ToDo("Text",false)
)
// This was added
val rv = findViewById<View>(R.id.rvTodos) as RecyclerView
val btnAddTodo = findViewById<View>(R.id.btnAddTodo) as Button
val etTodo = findViewById<View>(R.id.etTodo) as TextView
val adapter = ToDoAdapter(todoList)
rv.adapter = adapter
rv.layoutManager = LinearLayoutManager(this)
btnAddTodo.setOnClickListener{
val title = etTodo.text.toString()
val todo = ToDo(title,false)
todoList.add(todo)
adapter.notifyItemInserted(todoList.size – 1)
}
}
Enjoy
Okay so I see a lot of people have problem with this tutorial.
Problem 17:36
So in your build.gradle file add this code inside of android {} and make sure you press sync.
BUILD.GRADLE
buildFeatures {
viewBinding true
}
And this is how your code should look like.
CODE:
class ToDoAdapter(var todos: List<ToDo>): RecyclerView.Adapter<ToDoAdapter.ToDoViewHolder>() {
inner class ToDoViewHolder(val binding: ItemTodoBinding) : RecyclerView.ViewHolder(binding.root)
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ToDoViewHolder {
val layoutInflater = LayoutInflater.from(parent.context)
val binding = ItemTodoBinding.inflate(layoutInflater, parent, false)
return ToDoViewHolder(binding)
}
override fun onBindViewHolder(holder: ToDoViewHolder, position: Int) {
holder.binding.apply {
// tvTitle this now works
}
}
override fun getItemCount(): Int {
return todos.size
}
}
This is not bad tutorial but for beginners it's hard. Also Philipp should update with pined comment or something about this problem. And how to solve it.
Enjoy
I'm having one problem with this tutorial. I don't know if anyone will reply in time to help me with this assignment, but I'll throw it out there in case anyone in the future has the same problem. In the adapter class, in the onBindViewHolder function, I tried using the same method to set the text in my recycler view, but I'm getting "unresolved references." For an example, I have a line of code "forecast_date.text = forecastList[position].date" where forecast_date is the ID for that particular TextView in my forecast_list_item.xml file. That is highlighted in red with the unresolved reference. I see that your program added that import kotlinx statement when started coding this part, but I don't seem to have that option.
Any ideas why it's not seeing my forecast_list_item.xml file?…
Your explanation is just wow! Could you pls bring a video on the same but in Java?
Wow, this is such an elegant tutorial! Thank you!
I add the layout in onCreateViewHolder method. But I can't access the components of this layout in onBindViewHolder method . Anyone please help me …….
Such a shame you do videos on Kotlin… you are very good at explaining.
Thank you Philipp u are awesome all of the videos I have watched were top notch and easy to understand as well except for maybe this one. I didn't quite understand the whole thing about recycle view…can you please help me for am not so sure I can get a better place to learn than here? thanks in anticipation
I'm really thankful to you . This tutorial is very easy to understand and learn recycle view.
Glad I find this video at the first. The only thing is when you add the todo, the text on the keyboard is still there. How to get the EditText to empty itself after adding? Is there any systematic way?
Thank you Philipp, for the great tutorials! I follow the ANDROID FUNDAMENTALS FOR BEGINNERS and the tutorials are perfect so far.
Here is updated code with binding:
1) build.gradle
– add
buildFeatures{
viewBinding true
}
2) TodoAdapter.kt
package com.example.recyclerviewkotlin
import android.view.LayoutInflater
import android.view.ViewGroup
import androidx.recyclerview.widget.RecyclerView
import com.example.recyclerviewkotlin.databinding.ItemTodoBinding
class TodoAdapter(var todos: List<Todo>) : RecyclerView.Adapter<TodoAdapter.TodoViewHolder>() {
inner class TodoViewHolder(val binding: ItemTodoBinding) : RecyclerView.ViewHolder(binding.root)
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): TodoViewHolder {
val layoutInflater = LayoutInflater.from(parent.context)
val binding = ItemTodoBinding.inflate(layoutInflater, parent, false)
return TodoViewHolder(binding)
}
override fun onBindViewHolder(holder: TodoViewHolder, position: Int) {
holder.binding.apply {
tvTitle.text = todos[position].title
cdDone.isChecked = todos[position].isChecked
}
}
override fun getItemCount(): Int {
return todos.size
}
}
3) MainActivity.kt
package com.example.recyclerviewkotlin
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import androidx.recyclerview.widget.LinearLayoutManager
import com.example.recyclerviewkotlin.databinding.ActivityMainBinding
class MainActivity : AppCompatActivity() {
private lateinit var binding: ActivityMainBinding;
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding = ActivityMainBinding.inflate(layoutInflater)
setContentView(binding.root)
var todoList = mutableListOf(
Todo("Buy Shiba Inu", true),
Todo("Buy Terra Luna", true),
Todo("Buy CHSB", true),
Todo("Register to Swiss Borg -> https://join.swissborg.com/r/tuuliePSLJ", false),
Todo("Register to Binance -> https://accounts.binance.me/en/register?ref=78869052", false),
)
val adapter = TodoAdapter(todoList)
binding.rvTodos.adapter = adapter
binding.rvTodos.layoutManager = LinearLayoutManager(this)
binding.btnAddTodo.setOnClickListener {
val title = binding.etTodo.text.toString()
val todo = Todo(title, false)
todoList.add(todo)
adapter.notifyItemInserted(todoList.size – 1)
}
}
}
Thank you. The way you explain things, it's really easy to follow for newbies like me – very good job!
Where is "rvTodoItems" coming from in the main activity????
Thank youu !!
Great tutorial! I always look for your channel when I don't understand something in Android 🙂 Can you do a video on ListAdapter please
good explanation. thanks
I have mutableListOf in red. Does anybody know how to fix this issue?
Loved it!
thank you
I am getting tvTitle as an unresolved reference in onBindViewHolder function. How do I fix that?
Hello Phillip! Do you plan on creating a video about recyclerview in view binding?
Thanks a lot