Develop Reference

How to implement For-loop logic in Spinner (android Kotlin)

I have 6 repetitive codes and I just want to use for-loop logic.
I tried to use "getIdentifier" and "findViewById" But I failed.
val sb_spinner_secret_p1: Spinner = findViewById(R.id.sb_secret1)
ArrayAdapter.createFromResource(this, R.array.secret, android.R.layout.simple_spinner_item
).also { adapter ->
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item)
sb_spinner_secret_p1.adapter = adapter
}
I tried this but it never works
for(i in 1..7){
val sb_spinner = "sb_spinner_secret_p$i"
val sbsecret = "sb_secret$i"
val sb_spinner_resId = resources.getIdentifier(sb_spinner,"id", packageName)
val sbsecret_resId = resources.getIdentifier(sbsecret,"id", packageName)
}

How can I discriminate the selected item of a Spinner by its text when using multilanguage items in Android?

I am trying to discriminate the selected item of a Spinner by its (multilanguage) text.
Here is my default strings.xml content:
<string-array name="spinner_items">
<item>length</item>
<item>weight</item>
<item>temperature</item>
</string-array>
And this is another strings.xml (Italian language) content:
<string-array name="spinner_items">
<item>lunghezza</item>
<item>peso</item>
<item>temperatura</item>
</string-array>
I set up my Spinner items in this way:
val items = resources.getStringArray(R.array.spinner_items)
spinner.adapter = ArrayAdapter(requireContext(), android.R.layout.simple_spinner_item, items)
And then I add the item selected listener:
spinner.onItemSelectedListener = object : AdapterView.OnItemSelectedListener {
override fun onItemSelected(parent: AdapterView<*>, view: View, position: Int, id: Long) {
when(spinner.getItemAtPosition(position).toString()) {
"length" -> actionLength()
"lunghezza" -> actionLength()
"weight" -> actionWeight()
"peso" -> actionWeight()
"temperature" -> actionTemperature()
"temperatura" -> actionTemperature()
}
}
override fun onNothingSelected(parent: AdapterView<*>) {}
}
Everything works fine but the problem is that everytime I add a new language locale, I have to remember to add the specific string translation inside the when block.
Is there a more "dynamic" way to do this?

I had the same problem in the past and here is how I solved it.
Edit your strings.xml files by adding a string resource name for each items in your array, for example:
Default strings.xml
<string name="length">length</string>
<string name="weight">weight</string>
<string name="temperature">temperature</string>
<string-array name="spinner_items">
<item>#string/length</item>
<item>#string/weight</item>
<item>#string/temperature</item>
</string-array>
Italian strings.xml
<string name="length">lunghezza</string>
<string name="weight">peso</string>
<string name="temperature">temperatura</string>
<string-array name="spinner_items">
<item>#string/length</item>
<item>#string/weight</item>
<item>#string/temperature</item>
</string-array>
So in your code, you'll have:
when(spinner.getItemAtPosition(position).toString()) {
getString(R.string.length) -> actionLength()
getString(R.string.weight) -> actionWeight()
getString(R.string.temperature) -> actionTemperature()
}
I hope I was helpful!

Just use the position:
spinner.onItemSelectedListener = object : AdapterView.OnItemSelectedListener {
override fun onItemSelected(parent: AdapterView<*>, view: View, position: Int, id: Long) {
when(position) {
0 -> actionLength()
1 -> actionWeight()
2 -> actionTemperature()
}
}
override fun onNothingSelected(parent: AdapterView<*>) {}
}
In your array use:
<string-array name="spinner_items">
<item>#string/length</item>
<item>#string/weight</item>
<item>#string/temperature</item>
</string-array>

How to change values of variable using Spinner?

How do I change the value of a variable using the spinner widget.
strings.xml
<string name="selected_item">Selected item:</string>
<string-array name="Languages">
<item>English</item>
<item>Latin</item>
<item>French</item>
</string-array>
mainactivity
val spinner = findViewById<Spinner>(R.id.spinner)
if (spinner != null) {
val adapter = ArrayAdapter(
this,
android.R.layout.simple_spinner_item, languages
)
spinner.adapter = adapter
spinner.onItemSelectedListener = object :
AdapterView.OnItemSelectedListener {
override fun onItemSelected(
parent: AdapterView<*>,
view: View, position: Int, id: Long
) {
//what to do here?
}
}
}
suppose I want to change the value of this variable
strokeManager.lang = "en"

So you will want to use the position to access it from the list that you used to populate the spinner.
strokeManager.lang = languageMapToLangCode[languages.get(position)]
This should be defined in your class somewhere the spinner can access it
val languageMapToLangCode: HashMap<String, String> = hashMapOf("French" to "fr", "Latin" to "ln", "English to "en")

How to fix Android Spinner selection if it is not working?

Android Spinner is not working, the API is working and the Spinner's list of items is working. However, the item selection is not working.
class PlayerSignup2Activity : AppCompatActivity() {
private lateinit var positions : List<Position>
val positionSpinner = positionsSpinner
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(com.example.app.R.layout.activity_user_signup2)
//Positions from API
positions = APIService.getPositions(this)
val spinnerAdapter = ArrayAdapter(this, R.layout.spinner_item, positions)
spinnerAdapter.setDropDownViewResource(R.layout.spinner_item)
positionSpinner.adapter = spinnerAdapter
}
Spinner list
After selecting any item
Any idea on how to fix this?!

Try with this
<Spinner
android:id="#+id/spinner"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
In Kotlin
class MainActivity : /** Other Classes, */AdapterView.OnItemSelectedListener {
var list_of_items = arrayOf("Item 1", "Item 2", "Item 3")
override fun onCreate(savedInstanceState: Bundle?) {
spinner!!.setOnItemSelectedListener(this)
// Create an ArrayAdapter using a simple spinner layout and languages array
val aa = ArrayAdapter(this, android.R.layout.simple_spinner_item, list_of_items)
// Set layout to use when the list of choices appear
aa.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item)
// Set Adapter to Spinner
spinner!!.setAdapter(aa)
}
override fun onItemSelected(arg0: AdapterView<*>, arg1: View, position: Int, id:Long{
// use position to know the selected item
//here you will get the answwer
}
override fun onNothingSelected(arg0: AdapterView<*>) {
}
}

try using prompt for adding title in .XML file
<Spinner
android:id="#+id/spinner"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:prompt="#string/spinner_title"/>
or try adding 1 more item that contains whatever title you want like "select position" on index 0.
positions.add("select position");
positions.add("value 1");
after adding values to list set spinner value to index 0 by default using below code.
mSpinner.setSelection(0) .
and on Item Selected check if index 0 or value is "select position" then ignore selection else perform action you want.
private lateinit var positions : List<Position>
//add dummy data first
positions.add(Position("select position"));
//Positions from API
positions.addAll(APIService.getPositions(this));

How to use anko spinner?

I'm trying to add a spinner inside an alert using anko. My code so far looks like this:
alert(getString(R.string.alert)) {
positiveButton("Cool") { toast("Yess!!!") }
customView {
linearLayout {
textView("I'm a text")
padding = dip(16)
orientation = LinearLayout.VERTICAL
spinner(R.style.Widget_AppCompat_Spinner) {
id = R.id.spinner_todo_category
prompt = "Select a Category"
}
}
}
}.show()
but I get compilation errors because apparently that's not how to call a spinner. I've been looking at the docs (Anko GitHub Wiki) but it says nothing about spinners.
Thanks in advance

One solution :
class AddActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
val items = listOf(Friend("bla","bla",50),Friend("bla","bla",50));
val adapterFriends = ArrayAdapter(this,R.layout.mon_spinner,items)
verticalLayout {
val friends = spinner { adapter = adapterFriends }
val wine = editText()
button("Say Hello") {
onClick { toast("Hello, ${wine.text}!") }
}
}
}
}
with this layout (mon_spinner.xml) :
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:padding="10dp"
android:textSize="14sp"
android:textColor="#color/colorPrimary"
android:spinnerMode="dialog"
android:text="XXX"
/>
It's all right !!

Try this in your AnkoComponent:
spinner {
adapter = ArrayAdapter.createFromResource(
ctx,
R.array.your_string_array,
android.R.layout.simple_spinner_dropdown_item)
}