问题
How can I use setOnClickListener in each item in my ListView?
my xml :
<ListView
android:id="@+id/tv1"
android:layout_width="match_parent"
android:layout_height="wrap_content">
</ListView>
回答1:
in your kotlin activity:
override fun onCreate(savedInstanceState: Bundle?) {
val listView: ListView = findViewById(R.id.yourListViewId)
listView.onItemClickListener = AdapterView.OnItemClickListener { adapterView, view, i, l ->
//YOUR CODE HERE
}
}
回答2:
Nothing like getting to the party late. We are posting this answer because we struggled with setting a OnLongClickListener in our RecyclerAdapter Why because as you enter the code if the RETURN value is not included before adding the lines of code between the opening statement and the return the compiler complains and one would think they are just wrong here is a little code hope it helps anyone new to OnLongClickListener
class PersonRecyclerAdapter(contactList: List<Contact>, internal var context: Context) : RecyclerView.Adapter<PersonRecyclerAdapter.ViewHolder>() {
private var contactList: List<Contact> = ArrayList()
init { this.contactList = contactList }
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
val view = LayoutInflater.from(context).inflate(R.layout.new_single_card,parent,false)
return ViewHolder(view)
}
override fun getItemCount(): Int {
return contactList.size
}
override fun onBindViewHolder(holder: ViewHolder, position: Int) {
val items = contactList[position]
holder.item.text = items.name
holder.bindCheckBox()
// This code calls the function below in the inner class
// too much code manipulation
holder.list_new_card.setOnLongClickListener { view ->
holder.ckBox.isChecked = false
holder.ckBox.isEnabled = true
holder.item.text = items.name
true
}
/*holder.list_new_card.setOnClickListener {
holder.ckBox.isChecked = false
holder.ckBox.isEnabled = true
holder.item.text = items.name
//val i = Intent(context, MainActivity::class.java)
//i.putExtra("Mode", "E")
//i.putExtra("Id", items.id)
//i.putExtra("ET",items.name)
//i.flags = Intent.FLAG_ACTIVITY_NEW_TASK
//context.startActivity(i)
// This code attaches a listener to the tvName in the new_single_card.xml
}*/
holder.editCLICK.setOnClickListener {
val i = Intent(context, MainActivity::class.java)
i.putExtra("FROM", "U")
i.putExtra("MainActId",items.id)
i.putExtra("ET",items.name)
i.flags = Intent.FLAG_ACTIVITY_NEW_TASK
context.startActivity(i)
}
}
inner class ViewHolder(view: View) : RecyclerView.ViewHolder(view) {
var item: TextView = view.findViewById(R.id.tvName) as TextView
var list_new_card: CardView = view.findViewById(R.id.list_new_card) as CardView
var editCLICK: RelativeLayout = view.findViewById(R.id.editCLICK) as RelativeLayout
var ckBox:CheckBox = view.findViewById(R.id.ckBox)as CheckBox
// This is how you declare a instance of the Widiget you want to work with
fun bindCheckBox(){// Create function and BIND it in the onBindViewHolder function
ckBox.setOnCheckedChangeListener { view,isChecked ->
if(ckBox.isChecked){
item.visibility = View.VISIBLE
item.setTextColor(Color.parseColor("#FF0000"))
item.text = "Click & HOLD Me to View Item"
ckBox.isEnabled = false
}else
item.setTextColor(Color.parseColor("#000000"))
}
}
}
}
Note different ways to include listeners in RecyclerAdapter
来源：https://stackoverflow.com/questions/45783452/setonlongclicklistener-in-kotlin-android