我在Kotlin中找不到使用viewmodel或接口将数据从RecycerView适配器传递到片段的示例。
我曾尝试只使用一个bundle，但我在接收片段中接收到一个空bundle。
这是我的recyclerview适配器
class QnAMyProfileEditRecyclerViewAdapter(private val context: Context) : RecyclerView.Adapter<QnAMyProfileEditRecyclerViewAdapter.Holder>() {
private var currentUserQnADataMyProfileEdit = emptyList<QnAData>()
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): Holder {
val view: View = if (viewType == R.layout.rv_item_qn_a_my_profile) {
LayoutInflater.from(parent.context)
.inflate(R.layout.rv_item_qn_a_my_profile, parent, false)
} else {
LayoutInflater.from(parent.context)
.inflate(R.layout.rv_footer_new_qna_my_profile, parent, false)
}
return Holder(view)
}
override fun getItemCount(): Int {
return currentUserQnADataMyProfileEdit.size + 1
}
//implement Floating Action Button at the bottom of the recyclerview
override fun getItemViewType(position: Int): Int {
return if (position == currentUserQnADataMyProfileEdit.size) {
R.layout.rv_footer_new_qna_my_profile
} else {
R.layout.rv_item_qn_a_my_profile
}
}
override fun onBindViewHolder(holder: Holder, position: Int) {
if (position == currentUserQnADataMyProfileEdit.size) {
holder.viewHolderNewQnA?.setOnClickListener {
Toast.makeText(context, "New item intent", Toast.LENGTH_SHORT).show()
}
} else {
//Normal bind for RecyclerView
holder.bindData(currentUserQnADataMyProfileEdit[position])
holder.viewHolderCRUDQnAMyProfile?.setOnClickListener {
//Give QnACrud current QnAData --- send bundle
val bundle = Bundle()
bundle.putString(
"currentQnAQuestion",
currentUserQnADataMyProfileEdit[position].question
)
bundle.putString(
"currentQnAAnswer",
currentUserQnADataMyProfileEdit[position].answer
)
QnAMyProfileEditCRUDFragment().arguments = bundle
val activity: AppCompatActivity = context as AppCompatActivity
activity.supportFragmentManager.beginTransaction()
.add(R.id.cl_my_profile_edit, QnAMyProfileEditCRUDFragment())
.addToBackStack(null).commit()
}
}
}
fun setData(updateList: List<QnAData>) {
this.currentUserQnADataMyProfileEdit = updateList
notifyDataSetChanged()
}
inner class Holder(itemView: View) : RecyclerView.ViewHolder(itemView) {
val viewHolderQuestion =
itemView.findViewById(R.id.txt_question_qna_my_profile_edit) as TextView?
val viewHolderAnswer =
itemView.findViewById(R.id.txt_answer_qna_my_profile_edit) as TextView?
val viewHolderNewQnA =
itemView.findViewById(R.id.fab_new_qna_my_profile_edit) as FloatingActionButton?
val viewHolderCRUDQnAMyProfile =
itemView.findViewById(R.id.fab_crud_qna_my_profile_edit) as FloatingActionButton?
//Bind data with inflaters
fun bindData(currentUserInList: QnAData) {
viewHolderQuestion?.text = currentUserInList.question
viewHolderAnswer?.text = currentUserInList.answer
}
}
}
下面是我的片段，它是接收数据（bundle）的支持:
class QnAMyProfileEditCRUDFragment : Fragment() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
//Get bundle data and set Edit Text values
val bundle:Bundle? = arguments //Bundle == null!!!!
val qnaQuestionData: String? = bundle?.getString("currentQnAQuestion")
val qnaAnswerData: String? = bundle?.getString("currentQnAAnswer")
et_qna_question.setText(qnaQuestionData)
et_qna_answer.setText(qnaAnswerData)
}
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
return inflater.inflate(R.layout.fragment_qn_a_my_profile_edit_c_r_u_d, container, false)
}
override fun onAttach(context: Context) {
super.onAttach(context)
}
override fun onActivityCreated(savedInstanceState: Bundle?) {
super.onActivityCreated(savedInstanceState)
//Pop fragment if grey area(outside the box) is tapped
imv_overlay.setOnClickListener {
fragmentManager?.popBackStack()
}
}
}
QnAData是一个简单的数据类，具有Question:String和Answer:String
尝试在您的片段中创建一个构造函数，然后创建beginTransaction
val fragment = QnAMyProfileEditCRUDFragment.newInstance(
currentUserQnADataMyProfileEdit[position].question,
currentUserQnADataMyProfileEdit[position].answer)
activity.supportFragmentManager.beginTransaction()
.add(R.id.cl_my_profile_edit,fragment)
.addToBackStack(null).commit()
在QnAMyProfileEditCRUDFragment中，您可以只使用构造函数中的值
首先，要对代码进行一些重构:
查看器
class MyViewHolder(...) : RecyclerView.ViewHolder(...) {
fun bind(model: Model) {
...
itemView.setOnClickListener {
callback?.onSomeEventHappened(model)
//you can also pass lambda here instead of using an interface for callback
}
}
}
class Adapter : RecyclerView.Adapter<T>() {
interface callback {
fun onSomeEventHappened()
}
private var callback: callback? = null
fun setListener(listener: Callback) {
callback = listener
}
}
val SomeFragment = SomeFragment().apply {
SomeFragment.arguments = ... //A bundle for example
}
