我知道关于这个问题的疑问很少。但他们都没有解决我的问题，特别是我的代码是用 Kotlin 编写的，并且是新的Fragments。不要急于说我的问题是重复的。
我的问题正是标题所说的，我的RecyclerView仅填充了来自的一项（子项）Firebase in my Fragment.
Adapter:
class NewsList(private val userList: List<News>) : RecyclerView.Adapter<NewsList.ViewHolder>() {
private val Context = this
override fun onBindViewHolder(p0: ViewHolder?, p1: Int) {
val news: News = userList[p1]
p0?.mesajTextView?.text = news.text
val time = news.time
val getTimeAgo = GetTimeAgo()
val lastMsg = getTimeAgo.getTimeAgo(time, Context)
p0?.timeNewsTextView!!.text = lastMsg
}
override fun onCreateViewHolder(p0: ViewGroup?, p1: Int): ViewHolder {
val v = LayoutInflater.from(p0?.context).inflate(R.layout.news_layout, p0, false)
return ViewHolder(v)
}
override fun getItemCount(): Int {
return userList.size
}
class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
val mesajTextView = itemView.findViewById(R.id.mesajTextView) as TextView
val timeNewsTextView = itemView.findViewById(R.id.timeNewsTextView) as TextView
}
}
我的片段中填充了 RecyclerView：
override fun onActivityCreated(savedInstanceState: Bundle?) {
newsRecyclerView.layoutManager = LinearLayoutManager(context, LinearLayoutManager.VERTICAL, false)
}
private fun populalteQuestionsList() {
val mChatDatabaseReference = FirebaseDatabase.getInstance().reference.child(Constants.NEWS)
mListenerPopulateList = mChatDatabaseReference.addValueEventListener(object : ValueEventListener {
override fun onDataChange(dataSnapshot: DataSnapshot) {
for (convSnapshot in dataSnapshot.children) {
val news = ArrayList<News>()
val conv = convSnapshot.getValue(News::class.java)
news.add(conv!!)
val adapter = NewsList(news)
newsRecyclerView!!.adapter = adapter
adapter.notifyDataSetChanged()
}
}
override fun onCancelled(databaseError: DatabaseError) {
}
})
mChatDatabaseReference.addListenerForSingleValueEvent(mListenerPopulateList)
}
项目布局：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<android.support.v7.widget.CardView
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:id="@+id/card_view"
android:layout_gravity="center"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp"
card_view:cardCornerRadius="2dp"
card_view:contentPadding="10dp"
card_view:cardElevation="10dp">
<RelativeLayout
android:id="@+id/relativeLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingBottom="10dp"
android:paddingLeft="10dp"
android:paddingRight="10dp"
android:paddingTop="10dp">
<TextView
android:id="@+id/mesajTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:layout_marginStart="64dp"
android:textAppearance="?android:attr/textAppearanceLarge"
tools:text="Mesaj" />
<TextView
android:id="@+id/timeNewsTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_marginEnd="16dp"
android:layout_marginTop="4dp"
android:maxLength="15"
android:maxLines="1"
android:textAppearance="?android:attr/textAppearanceSmall"
tools:text="14:20" />
</RelativeLayout>
</android.support.v7.widget.CardView>
</LinearLayout>
希望您理解，请帮助我，我真的需要完成这个应用程序。
