Kotlin: Remove list in Recycerview using AlertDialog button - kotlin

Question

I hope to remove items in Recyclerview by AlertDialog button.
Do you have idea?
Adapter & Viewholer
class ProjectsRecyclerAdapter(val list:List<ProjectListDataModel>, var clickListner: OnProjectListClickListner) : RecyclerView.Adapter<ProjectRecyclerViewHolder>() {
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ProjectRecyclerViewHolder {
val view = LayoutInflater.from(parent.context).inflate(R.layout.item_cardview, parent, false)
return ProjectRecyclerViewHolder(
view
)
}
override fun getItemCount(): Int {
return list.count()
}
override fun onBindViewHolder(holder: ProjectRecyclerViewHolder, position: Int) {
holder.initialize(list[position], clickListner)
}
}
class ProjectRecyclerViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
fun initialize(item: ProjectListDataModel, action: OnProjectListClickListner) {
itemView.projectNameText.text = item.name
itemView.modifiedTimeText.text = item.modTime
itemView.descriptionText.text = item.description
itemView.setOnClickListener {
action.onItemClick(item, adapterPosition)
}
}
}
interface OnProjectListClickListner {
fun onItemClick(item: ProjectListDataModel, position: Int)
}
And here is Main Activity
class LocalProjectListActivity :
AppCompatActivity(),
OnProjectListClickListner,
NavigationView.OnNavigationItemSelectedListener {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.main)
val localProjectList = listOf(
ProjectListDataModel(
"Project A",
"Sun, 01/DEC/2020, 22:23GMT",
"Testing 1",
"AAAA",
"A, A",
8,
232
),
ProjectListDataModel(
"Project B",
"Sun, 01/JUL/2020, 10:23GMT",
"Testing 2",
"BBBB",
"B, B",
6,
354
),
ProjectListDataModel(
"Project C",
"Sun, 11/MAR/2020, 08:31GMT",
"Testing 3",
"CCCC",
"C,C",
15,
632
)
)
val adapter = ProjectsRecyclerAdapter(localProjectList, this)
projectNameText.adapter = adapter
projectNameText.setHasFixedSize(true)
projectNameText.layoutManager = LinearLayoutManager(this)
}
override fun onItemClick(item: ProjectListDataModel, position: Int) {
val builder = AlertDialog.Builder(this)
val ad = builder.create()
val dialogView = layoutInflater.inflate(R.layout.project_onclick, null)
dialogView.projectNameText.text = item.name
dialogView.modifiedTimeText.text = item.modTime
dialogView.descriptionText.text = item.description
dialogView.fileNumberText.text = item.fileNumber.toString() + "EA"
dialogView.fileSizeText.text = item.fileSize.toString() + "MB"
dialogView.scopeText.text = item.scope
dialogView.userIdText.text = item.resposible
ad.setView(dialogView)
ad.show()
//when click Load button
dialogView.loadButton.setOnClickListener {
ad.dismiss()
val dialog = AlertDialog.Builder(this)
dialog.setTitle("Question1")
dialog.setMessage("You want to go to the project?")
dialog.setPositiveButton("Yes", DialogInterface.OnClickListener { _, _ ->
})
dialog.setNegativeButton("No", DialogInterface.OnClickListener { _, _ ->
val fileFilterIntent = Intent(this, ProjectFileActivity::class.java)
startActivity(fileFilterIntent)
})
dialog.setNeutralButton("Cancel", DialogInterface.OnClickListener {dialog, _ ->
dialog.dismiss()
})
//if(isMarker == true) {
dialog.show()
//} else {}
}
dialogView.deleteButton.setOnClickListener {
ad.dismiss()
val dialog = AlertDialog.Builder(this)
dialog.setTitle("Delet project list")
dialog.setMessage("You want to delete project?")
dialog.setPositiveButton("Yes", DialogInterface.OnClickListener { _, _ ->
**//Delete items in RecyclerView**
})
dialog.setNeutralButton("Cancel", null)
dialog.show()
}
dialogView.cancleButton.setOnClickListener { ad.dismiss() }
}
override fun onNavigationItemSelected(item: MenuItem): Boolean {
when (item.itemId) {
R.id.remoteProjects -> {
val serverProjIntent = Intent(this, ServerProjectListActivity::class.java)
startActivity(serverProjIntent)
}
R.id.settings -> {
Toast.makeText(this, "Go to Settings", Toast.LENGTH_SHORT).show()
}
}
mainLocal.closeDrawer(GravityCompat.START)
return true
}
}
I posted all the code like that.
I can get the lists using Recyclerview, and made the AlertDialog But I don't know how to delete the items using the "Yes" button in AlertDialog.
Please give me some advises.

Answer 1

You'll need to have a reference to the list and the adapter outside of onCreate
private val localProjectList = mutableListOf(
ProjectListDataModel(
"Project A",
"Sun, 01/DEC/2020, 22:23GMT",
"Testing 1",
"AAAA",
"A, A",
8,
232
),
ProjectListDataModel(
"Project B",
"Sun, 01/JUL/2020, 10:23GMT",
"Testing 2",
"BBBB",
"B, B",
6,
354
),
ProjectListDataModel(
"Project C",
"Sun, 11/MAR/2020, 08:31GMT",
"Testing 3",
"CCCC",
"C,C",
15,
632
)
)
private lateinit var adapter: ProjectsRecyclerAdapter
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.main)
adapter = ProjectsRecyclerAdapter(localProjectList, this)
projectNameText.adapter = adapter
projectNameText.setHasFixedSize(true)
projectNameText.layoutManager = LinearLayoutManager(this)
}
And then delete the list and notify the adapter
private fun deleteItemsAndNotifyAdapter() {
localProjectList.clear()
adapter.notifyDataSetChanged()
}
You can delete and notify adapter in you dialog:
private var alertDialog: AlertDialog? = null
private fun showDeleteDialog() {
val builder = AlertDialog.Builder(activity)
builder.run {
setTitle("Delete project list")
setMessage("You want to delete project?")
setPositiveButton("Yes") { _, _ ->
deleteItemsAndNotifyAdapter()
}
setNegativeButton("Cancel") { _, _ ->
}
}
alertDialog = builder.create()
alertDialog?.show
}