Develop Reference

how I can hide the element with index 0 from dropdown list in spinner

Please tell me how can I hide the item at index 0 from the dropdown in the spinner in Android Studio? I am using this code, it works, but when I open the list, it shows at the bottom. That is, it is focused on the elements below. what do i need to change?
SpinnerName = (Spinner) v.findViewById(R.id.spinner1);
ArrayList<String> names = new ArrayList<>();
names.add(0, "SELECT");
names.add(1, "Name1");
names.add(2, "Name2");
final int listsize = names.size()-1;
ArrayAdapter<String> adapter = new ArrayAdapter<String>(getContext(), android.R.layout.simple_spinner_item, names){
#Override
public int getCount() {
return(listsize);
}
};
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
SpinnerName.setAdapter(adapter);
adapter.setDropDownViewResource(R.layout.spinner_list);
SpinnerName.setSelection(listsize);
SpinnerName.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parent, View view, int pos,
long id) {
....
}
#Override
public void onNothingSelected(AdapterView<?> arg0) {
}
});

SpinnerName.setSelection(listsize);
your problem is here! you are passing the total list size number and
that where you are doing wrong, because setSelection method use to
show default index of spinner.
you can simply do that SpinnerName.setSelection(1); that would give you the fist spinner item unless showing the names.add(0, "SELECT"); item

Generate Plain Text Fields Based on Chosen Spinner Value?

I'm currently working on creating an app in android studio. The problem I am facing is generating a number of "plain text" objects based on the number chosen in a spinner. I have included layout of the activity below.
layout of activity can be seen here
Once the "number of people" are picked, then the area to enter the peoples names will be generated based on that. Max number of people will be 4.
Any help on how to do this would be much appreciated!

I would suggest using an OnItemSelectedListener() on your spinner along with setting the setVisibility() of your 'person' fields.
This code will assume your minimum people to be 1. Each time a new value is selected from the spinner the fields will appear or disappear. Using GONE for visibility will hide the field but also remove the space used by it. Use INVISIBLE if you want to keep the space.
Also don't bother setting the visibility in the xml layout code as this can cause issues.
person1 = (EditText)findViewById(R.id.person1);
person2 = (EditText)findViewById(R.id.person2);
person3 = (EditText)findViewById(R.id.person3);
person4 = (EditText)findViewById(R.id.person4);
list = new ArrayList<String>();
list.add("1");
list.add("2");
list.add("3");
list.add("4");
spinner = (Spinner)findViewById(R.id.spinner);
ArrayAdapter<String> adapter= new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, list);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(adapter);
spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener()
{
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id)
{
spinnerValue = parent.getItemAtPosition(position).toString();
int value = Integer.parseInt(spinnerValue);
// Simpler logic for the visibility of the 'people' - kudos to RobCo for pointing this out//
person1.setVisibility(value>=1? view.VISIBLE:View.GONE);
person2.setVisibility(value>=2? view.VISIBLE:View.GONE);
person3.setVisibility(value>=3? view.VISIBLE:View.GONE);
person4.setVisibility(value>=4? view.VISIBLE:View.GONE);
/*
if (value == 1)
{
person1.setVisibility(View.VISIBLE);
person2.setVisibility(View.GONE);
person3.setVisibility(View.GONE);
person4.setVisibility(View.GONE);
}
else if (value == 2)
{
person1.setVisibility(View.VISIBLE);
person2.setVisibility(View.VISIBLE);
person3.setVisibility(View.GONE);
person4.setVisibility(View.GONE);
}
else if (value == 3)
{
person1.setVisibility(View.VISIBLE);
person2.setVisibility(View.VISIBLE);
person3.setVisibility(View.VISIBLE);
person4.setVisibility(View.GONE);
}
else
{
person1.setVisibility(View.VISIBLE);
person2.setVisibility(View.VISIBLE);
person3.setVisibility(View.VISIBLE);
person4.setVisibility(View.VISIBLE);
}
*/
}
#Override
public void onNothingSelected(AdapterView<?> parent)
{
}
});
Good luck.

You simply do it by setting the visibility of all the 4 EditTexts as false and set a listener to the spinner. And inside the listener add if else statement and depending upon the selection you can set the visibility on for the EditText fields.

Android Spinner Doesn't Return Id Properly

I'm having a difficulty in spinner android, more specifically in the data saving part.
First, I'm going to tell you what is the purpose behind the code below.
I want to create a spinner that user can choose which planet to buy, then when he/she hits the submit button, a toast will appear saying "You wanted to buy: ...." then followed by a purchase summary like username & price.
However, in the middle of the process I'm having a hard time to save the id of each spinner's element.
Every time I chose "Earth" (id= 1) & hit submit, the toast will always refer back to "Mars" which has id = 0. So it seems that the problem is my submit button will always reset the chosen id.
I intentionally set planetSpinner() method to return int, thus I could always track down the "id" being returned. But again, the submit button would always make it shows to id = 0.
Can anyone help me? I would really appreciate that. Thank you.
Spinner Code (MainActivity.java)
public int planetSpinner(){
context = this;
List<String> categories = new ArrayList<String>();
categories.add("Mars($12 billions)"); //0
categories.add("Earth ($99 billions)"); //1
categories.add("Jupiter ($13 billions)"); //2
cSpinner = (Spinner) findViewById(R.id.coffee_spinner);
ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, categories);
dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
cSpinner.setAdapter(dataAdapter);
cSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
Toast.makeText(MainActivity.this, "You selected: " + cSpinner.getItemAtPosition(position), Toast.LENGTH_LONG).show();
}
#Override
public void onNothingSelected(AdapterView<?> parent) {
Toast.makeText(MainActivity.this, "Nothing selected", Toast.LENGTH_LONG).show();
}
});
return cSpinner.getSelectedItemPosition();
}
Submit Purchase Code (MainActivity.java)
public void submitOrder(View view){
Toast.makeText(MainActivity.this, "You wanted to buy: " + planetSpinner(), Toast.LENGTH_LONG).show();
displayMessage(confirmationOrder(userName, price));
}

public class MySpinner extends Activity implements OnItemSelectedListener{
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Spinner spinner = (Spinner) findViewById(R.id.coffee_spinner);
spinner.setOnItemSelectedListener(this);
List<String> categories = new ArrayList<String>();
categories.add("Mars($12 billions)"); //0
categories.add("Earth ($99 billions)"); //1
categories.add("Jupiter ($13 billions)"); //2
ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, categories);
// Drop down layout style - list view with radio button
dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
// attaching data adapter to spinner
spinner.setAdapter(dataAdapter);
}
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
// On selecting a spinner item
String item = parent.getItemAtPosition(position).toString();
// Showing selected spinner item
Toast.makeText(parent.getContext(), "Selected: " + item, Toast.LENGTH_LONG).show();
}
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
}

Have you try this:
Toast.makeText(MainActivity.this, "You selected: " + categories.get(position), Toast.LENGTH_LONG).show();

It is because the spinner was reinitialized everytime you call the function. Thus, the selected value was the first item, that is why your function always returns 0. Hope that helps.

Array position using onItemClickListener

I'm trying to get the position of an array using the onItemClickListner.
With the following code, I am able to pass the text of the item clicked but not the position of the array eg 0, 1, 2 etc.
String[] menuItems = new String[]{"Hello", "Is it me", "Youre", "Looking for"};
ListAdapter adapter = new ArrayAdapter<String>(this, R.layout.menulists, R.id.menulistsTextView1, menuItems);
ListView listView = (ListView) findViewById(R.id.mainListView1);
listView.setAdapter(adapter);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> l, View v, int position, long id) {
String selected = (String) l.getItemAtPosition(position);
}
Any tips on whether it is possible to do that, I tried changing String to int and also to use the getItemIDAtPosition function but would not work, would just close the application.
Cheers
EDIT
I have just taken a different approach to achieving what I want to do using if statements for the string of the item clicked. Thanks for the input

You can get the position from method signature :
public void onItemClick(AdapterView<?> l, View v, int position, long id)
position give you index of selected item.

you may try this :
String itemClicked = menuItems[position];

As I understand Your problem - You want to get item on clicked position. Do do so use getItem(position) method of adapter. Code:
String[] menuItems = new String[]{"Hello", "Is it me", "Youre", "Looking for"};
//VERY IMPORTANT
//adapter must be declared final to use it in onItemClick
//or adapter should be object parameter
final ListAdapter adapter = new ArrayAdapter<String>(this, R.layout.menulists, R.id.menulistsTextView1, menuItems);
ListView listView = (ListView) findViewById(R.id.mainListView1);
listView.setAdapter(adapter);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> l, View v, int position, long id) {
String selected = <String>adapter.getItem(position);
}
});

how to change the string array of a spinner at runtimeHow to use the selected item of a spinner in an if statement (Android in eclipse)

Hi I have a spinner (spinner1) and when the user selects an item from it (example: "Canada" I want the spinner2 to populate with Provinces of "canada". I have tried the following but it doesnt work. I tried to do this by using:
if (spinner1.getSelectedItem().toString().equals("Canada"))
{
addItemsOnSpinner2();
}
public void addItemsOnSpinner2() {
spinner2 = (Spinner) findViewById(R.id.spinner2);
List list = new ArrayList();
list.add("Item 1");
list.add("Item 2");
list.add("Item 3");
list.add("Item 4");
ArrayAdapter dataAdapter = new ArrayAdapter(this,android.R.layout.simple_spinner_item, list);
dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner2.setAdapter(dataAdapter);
}
for some reason the items aren't being added to spinner2. please help

This code
if (spinner1.getSelectedItem().toString().equals("Canada"))
{
addItemsOnSpinner2();
}
will only run the first time the Activity is created since it is in your onCreate(). You need to add this code to your onItemSelected() for spinner1. So you first need to implement an OnItemSelected listener to that spinner.
spinner1.setOnItemSelected(new OnItemSelected()
{
#Override
public void onItemSelected(AdapterView<?> parent, View v, int position,
long id)
{
TextView tv = (TextView)v; // cast the View to a TextView
if ("Canada".equals(tv.getText().toString())
{
addItemsOnSpinner2();
}
}
#Override
public void onNothingSelected(AdapterView<?> arg0) {
}
});
Something like this should work. Although, you will probably be safer to use position instead of getting the text.
OnItemSelected Docs