我正在创建 Notes 应用程序，它显示来自本地数据库的用户注释。该应用程序运行良好，但是当我尝试多次搜索（查询）笔记时，某些数据不会显示。
应用截图：
NotesViewModel
class NotesViewModel(private val database: NotesDao) : ViewModel() {
fun searchNotes(string: String) = database.searchNote(string)
}
笔记片段
binding.searchEditText.doOnTextChanged { text, _, _, _ ->
notesViewModel.searchNotes("%$text%").observe(viewLifecycleOwner, {
adapter.submitList(it)
Log.v("NotesFragment: ", it.toString()) //Log return expected data
})
}
笔记适配器
class NotesAdapter(private val clickListener: NoteClickListener) : ListAdapter<Notes, NotesAdapter.NotesViewHolder>(NotesDiffCallBack()) {
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): NotesViewHolder {
return NotesViewHolder.from(parent)
}
override fun onBindViewHolder(holder: NotesViewHolder, position: Int) {
val item = getItem(position)
holder.bind(clickListener, item)
}
class NotesViewHolder private constructor(private val binding: ListItemNotesBinding) : RecyclerView.ViewHolder(binding.root) {
fun bind(clickListener: NoteClickListener, item: Notes) {
binding.note = item
binding.clickListener = clickListener
binding.executePendingBindings()
}
.......
}
}
BindingUtil
@BindingAdapter("noteTitle")
fun TextView.setNoteTitle(item: Notes?) {
item?.let {
Log.v("BindingUtil ", "title -> "+ it.noteTitle) // Log return expected data
when (it.noteTitle.isEmpty()) {
true -> visibility = View.GONE
false -> text = item.noteTitle
}
}
}
list_item_notes.xml
<data>
<variable
name="note"
type="com.example.notes.db.Notes" />
<data/>
...
<TextView
android:id="@+id/note_title_textview"
app:noteTitle="@{note}" />
NotesAdapter 中的 NotesDiffCallBack
class NotesDiffCallBack : DiffUtil.ItemCallback<Notes>() {
override fun areItemsTheSame(oldItem: Notes, newItem: Notes): Boolean {
return oldItem.noteId == newItem.noteId
}
override fun areContentsTheSame(oldItem: Notes, newItem: Notes): Boolean {
return oldItem == newItem
}
}
数据库返回的'note'数据是正确的。甚至 Log.v() 在“NotesFragment”和“BindingUtil”中都显示了正确的“note”数据，但不会显示在 UI 上。这真的很烦人。请帮忙 ！！