Develop Reference

How to programatically set entries of spinner in android?

I have made various string-arrays in the string.xml file and I have to set different arrays as entries for the spinner according to certain condition in Java. Is it possible or is database the only way to do so. Thanks in advance.

You need to use an adapter and populate with tha array in xml file.
Specify the name of your array in xml at createFromResource method (second parameter).
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this, R.array.my_array, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
mySpinner.setAdapter(adapter);

You have to extract your data from file:
String[] testArray = getResources().getStringArray(R.array.testArray);
Then, you have to inflate in the spinner:
ArrayAdapter<String> spinnerArrayAdapter = new ArrayAdapter<String>(
this, android.R.layout.simple_spinner_item, testArray );
mySpinner.setAdapter(spinnerArrayAdapter);

You can start with using ArrayAdapter, it is a simple class to populate spinner items programmatically.
String data[];
//... do your stuff to get populate this array
ArrayAdapter<String> spinnerArrayAdapter = new ArrayAdapter<String>(
this, android.R.layout.simple_spinner_item, data);
mySpinner.setAdapter(spinnerArrayAdapter);
You can also modify the view of dropdown items and customize them further by overriding this class.

Android programming spinner swap elements of spinner

need to do so when you click on a specific button (application type translator and arrow key) changed one of the selected items to another spinner itam swapped Well, here is how it can be implemented?
here is the code but it does not work!
int spinner1Index = spinner.getSelectedItemPosition();
spinner.setSelection(spinner2.getSelectedItemPosition());
spinner2.setSelection(spinnerfirst);
can offer something similar or fix!

You would have to change the adapter of your spinner and call notifyDataSetChanged()

I would suggest adding this to your switch case for when the item is selected.
Set a custom adapter for the spinner on item click.
//An array of what you want to populate the spinner with
Array spinnerArray [] = {"One", "Two", "Etc.."};
ArrayAdapter<String> spinnerArrayAdapter = new ArrayAdapter<String>(
this, android.R.layout.simple_spinner_item, spinnerArray);
spinnerArrayAdapter.setDropDownViewResource( android.R.layout.simple_spinner_dropdown_item );
//Before setting the adapter, clear and notify the previous ArrayList used
arrayList.clear();
arrayList.notify();
spinner.setAdapter(spinnerArrayAdapter);

ArrayAdapter.createFromResource issue

I am trying to make "Select one" on Spinner. I saw all answer regarding this subject but I am still having some issues. Usual way of making custom spinner is:
ArrayAdapter<CharSequence> dataAdapter1 = ArrayAdapter.createFromResource(this, R.array.entries,
android.R.layout.simple_spinner_item);
dataAdapter1.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner1.setAdapter(dataAdapter1);
spinner1.setAdapter(
new NothingSelectedSpinnerAdapter(
dataAdapter1,
R.layout.contact_spinner_row_nothing_selected,
this));
In this code I have to define R.array.entries in Strings.xml, but my app is populating spinner from MySQL and I am having a list grad[i]=json.getString("Grad");. How can I create this ArrayAdapter.createFromResource with that list instead of Entries that are defined in Strings.xml? Tnx

Query the data, put it in a List or Array and use this constructor of Array Adapter
ArrayAdapter<CharSequence> dataAdapter1 = new ArrayAdapter(this,
android.R.layout.simple_spinner_item, yourArrayOrList);
More here: http://developer.android.com/reference/android/widget/ArrayAdapter.html#ArrayAdapter(android.content.Context, int, java.util.List)

Array Adapter Issue

I'm trying to input an array into a ListView. I've gotten it to work for a spin box with this code:
Spinner spinner = (Spinner) findViewById(R.id.location_spinner);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, model.getLocationsArray());
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(adapter);
When I run the next block of code the program closes unexpectedly. Strangely if I remove model.getLocationsArray() it runs but the view won't update.
ListView listView = (ListView) findViewById(R.id.available_locations_list);
adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, model.getLocationsArray());
listView.setAdapter(adapter);
Thanks in advance!

model.getLocationsArray() instead this... you can use directly Arraylist object. If you have.Nullpointer Exc. because of from your EditText value cant be added to your ArrayList.

Populating ListView with ArrayAdapter force closes

I am trying to use the following code to populate a ListView using a predefined array of strings:
String[] schedule_names = getResources().getStringArray(R.array.test_schedules);
// Populate the ListView using the array of schedule names
ArrayList<String> als = new ArrayList<String>(Arrays.asList(schedule_names));
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, R.id.listView, als);
adapter.add("Test");
ListView listView = (ListView) findViewById(R.id.listView);
listView.setAdapter(adapter);
But it force closes unless I comment out listView.setAdapter(adapter); (which obviously means the ListView isn't populated at all). It seems the reason is a NullPointerException.
Why is this?

This line is wrong...
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, R.id.listView, als);
...the second parameter of the constructor should not be your ListView, it should be a layout with a TextView.
Try replacing R.id.listView with android.R.layout.simple_list_item_1