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<layout... >

    <data>
        <variable
            name="viewModel"
            type="com.azaless.cheerball.viewmodels.TeamDetailViewModel" />
    </data>
    
    ...
    

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class TeamDetailViewModel(private val cheerBallDataRepository: CheerBallDataRepository,
                          private val teamId: Int) : ViewModel() {
	private val players = MutableLiveData<List<Player>>()
	private val compositeDisposable: CompositeDisposable = CompositeDisposable()

	val adapter = MutableLiveData<PlayerListAdapter>()
	val layoutManager = MutableLiveData<RecyclerView.LayoutManager>()

	fun getPlayers(): LiveData<List<Player>> {
		return players

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<?xml version="1.0" encoding="utf-8"?>
<layout
    xmlns:android="http://schemas.android.com/apk/res/android" >

    <data>
        <variable
            name="player"
            type="com.azaless.cheerball.view.model.Player" />
    </data>

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class PlayerListAdapter : DataBindingAdapter<List<Player>, PlayerListAdapter.ViewHolder>() {

	override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
		val layoutInflater = LayoutInflater.from(parent.context)
		val binding = DataBindingUtil.inflate<ListItemPlayerBinding>(layoutInflater, R.layout.list_item_player, parent, false)
		return ViewHolder(binding)
	}

	override fun getItemCount() = values?.size ?: 0

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<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

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class GroupBallItemAdapter : RecyclerView.Adapter<GroupBallItemAdapter.ViewHolder>(){
	var values: List<GroupDetail> = listOf()
		set(items) {
			field = items
			notifyDataSetChanged()
		}

	override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
		return ViewHolder(LayoutInflater.from(parent.context)
			.inflate(R.layout.list_item_team_small, parent, false))

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<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">


    <LinearLayout

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var values: List<GroupDetail> = listOf()
	set(items) {
		field = items
		notifyDataSetChanged()
	}

override fun onBindViewHolder(holder: ViewHolder, position: Int) {
	with(holder) {
		value.keys.filterIndexed { index, _ -> index == position }
			.firstOrNull()?.let { key ->

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class TeamDetailViewModel(private val cheerBallDataRepository: CheerBallDataRepository,
                          private val teamId: Int) : ViewModel() {
	private val flagURL = MutableLiveData<String>()
	private val team = MutableLiveData<Team>()
	private val players = MutableLiveData<List<Player>>()
	private val compositeDisposable: CompositeDisposable = CompositeDisposable()

	val teamName = MutableLiveData<String>()
	val adapter = MutableLiveData<PlayerListAdapter>()
	val layoutManager = MutableLiveData<RecyclerView.LayoutManager>()

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override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
		super.onViewCreated(view, savedInstanceState)
		
		// factory คือ การสร้าง model โดยมีการโยนค่าอื่นๆเข้าไป
		val factory = InjectorUtils.provideTeamViewModelFactory(context!!, teamId, teamName)
		teamDetailViewModel = ViewModelProviders.of(this, factory).get(TeamDetailViewModel::class.java)
	
		viewDataBinding.viewModel = teamDetailViewModel	

		teamDetailViewModel.adapter.value = PlayerListAdapter()