how can i make menu item (single) reset button? - kotlin

Question

I want to make reset button.
when I click reset button, ischecked will be set to false for R.id.item1, R.id.item2, and R.id.item3.
when I click button, I want to Group 'Mmenu' be checked to false
I tried button.setOnClickListener(){item.isChecked = false} in onCreateOptionsMenu(menu: Menu)
but didn't work...
And I tried same thing behind when (item.itemId) {R.id.itemRotate ->
but didn't work too...
class MainActivity : AppCompatActivity() {
public override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
title = "제주도 풍경"
button.setOnClickListener(){
imageView1.visibility = View.INVISIBLE
imageView1.rotation = Float.parseFloat("0")
edtAngle.setText("0")
}
}
override fun onCreateOptionsMenu(menu: Menu): Boolean {
super.onCreateOptionsMenu(menu)
val mInflater = menuInflater
mInflater.inflate(R.menu.menu1, menu)
return true
}
override fun onOptionsItemSelected(item: MenuItem) : Boolean {
when (item.itemId) {
R.id.itemRotate -> {
imageView1.visibility = View.VISIBLE
imageView1.rotation = Float.parseFloat(edtAngle.text.toString())
return true
}
R.id.item1 -> {
imageView1.visibility = View.VISIBLE
imageView1.setImageResource(R.drawable.jeju2)
item.isChecked = true
return true
}
R.id.item2 -> {
imageView1.visibility = View.VISIBLE
imageView1.setImageResource(R.drawable.jeju14)
item.isChecked = true
return true
}
R.id.item3 -> {
imageView1.visibility = View.VISIBLE
imageView1.setImageResource(R.drawable.jeju6)
item.isChecked = true
return true
}
}
return false
}
}

Answer 1

You can do this using a HashMap :
var checked: HashMap<Int, Boolean> = HashMap()
Initialize to false
val ids = listOf(R.id.item1, R.id.item2, R.id.item3)
ids.forEachIndexed { index, _ ->
checked[index] = false
}
Then
when (item.itemId) {
R.id.itemRotate -> {
imageView1.visibility = View.VISIBLE
imageView1.rotation = Float.parseFloat(edtAngle.text.toString())
return true
}
R.id.item1 -> {
imageView1.visibility = View.VISIBLE
imageView1.setImageResource(R.drawable.jeju2)
checked[item.itemId] = true
return true
}
R.id.item2 -> {
imageView1.visibility = View.VISIBLE
imageView1.setImageResource(R.drawable.jeju14)
checked[item.itemId] = true
return true
}
R.id.item3 -> {
imageView1.visibility = View.VISIBLE
imageView1.setImageResource(R.drawable.jeju6)
checked[item.itemId] = true
return true
}
}
To reset:
fun reset() {
ids.forEachIndexed { index, _ ->
checked[index] = false
}
}
To be called here:
button.setOnClickListener(){
imageView1.visibility = View.INVISIBLE
imageView1.rotation = Float.parseFloat("0")
edtAngle.setText("0")
reset()
}

Answer 2

invalidateOptionsMenu()
this is solution to reset!!