I'm populating a spinner with a number of records from my SQlite database using the following code:
DBHelper db = new DBHelper(getBaseContext());
Cursor cursor_clients = db.select("clients", "_id, name", "ORDER BY name"); // table, fields, filter/order
String[] columns = new String[] { "name" };
int[] to = new int[] { android.R.id.text1 };
SimpleCursorAdapter mAdapter = new SimpleCursorAdapter(this, android.R.layout.simple_spinner_item, cursor_clients, columns, to, 0);
mAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
Spinner spnClients = (Spinner) findViewById(R.id.spnClients);
spnClients.setAdapter(mAdapter);
It works great, and I can use
spnAcademias.getSelectedItemId();
To get the _id of the selected record. My problem is: How to select an item on this spinner by the _id?
I have the _id of the row I want, I want it to show this row selected, and not the first row coming from the query.
Doing more research I ended up with the solution here: setSelection on Spinner based on rowId
I thought maybe there was a native solution without a loop, but there is not.
Solution:
public void setSpinnerItemById(Spinner spinner, int _id)
{
int spinnerCount = spinner.getCount();
for (int i = 0; i < spinnerCount; i++)
{
Cursor value = (Cursor) spinner.getItemAtPosition(i);
long id = value.getLong(value.getColumnIndex("_id"));
if (id == _id)
{
spinner.setSelection(i);
break;
}
}
}
If you're able to just as easily get the text value of the row you are looking for, then try the solution here, and more specifically the top comment on it: Set selected item of spinner programmatically
Use the following: spinnerObject.setSelection(INDEX_OF_CATEGORY2).
...
... I also found a way of getting the index without needing to loop through the adapter. I used the following mySpinner.setSelection(arrayAdapter.getPosition("Category 2"));
I have:
a String array with an unknown length that's populated with unknown items (let's say fish, bird, cat)
an ArrayAdapter and a Spinner that displays the items
a variable that contains one unknown item from the string array (let's say cat)
I want to set the Spinner to the value from the variable (cat). What's the most elegant solution? I thought about running the string through a loop and comparing the items with the variable (until I hit cat in this example), then use that iteration's # to set the selection of the Spinner, but that seems very convoluted.
Or should I just ditch the Spinner? I looked around and found a solution that uses a button and dialog field: https://stackoverflow.com/a/5790662/1928813
//EDIT: My current code. I want to use "cow" without having to go through the loop, if possible!
final Spinner bSpinner = (Spinner) findViewById(R.id.spinner1);
String[] animals = new String[] { "cat", "bird", "cow", "dog" };
String animal = "cow";
int spinnerpos;
final ArrayAdapter<String> animaladapter = new ArrayAdapter<String>(
this, android.R.layout.simple_spinner_item, animals);
animaladapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
bSpinner.setAdapter(animaladapter);
for (Integer j = 0; j < animals.length; j++) {
if (animals[j].equals(animal)) {
spinnerpos = j;
bSpinner.setSelection(spinnerpos);
} else {
};
}
(Temporarily) convert your String array to a List so you can use indexOf.
int position = Arrays.asList(array).indexOf(randomVariable);
spinner.setSelection(position);
EDIT:
I understand your problem now. If your String array contains all unique values, you can put them in a HashMap for O(1) retrieval:
HashMap<String, Integer> map = new HashMap<String, Integer>();
for (int i = 0; i < animals.length; i++) {
map.put(animals[i], i);
}
String randomAnimal = "cow";
Integer position = map.get(randomAnimal);
if (position != null) bSpinner.setSelection(position);
My application has records. Records has categories. In edit record activity I need set category of record to Spinner by categoryId. I found solution like below:
for (int i = 0; i < spinner.getCount(); i++) {
Cursor value = (Cursor) spinner.getItemAtPosition(i);
long id = value.getLong(value.getColumnIndex("_id");
if (id == rowid) {
spinner.setSelection(i);
}
}
but it is a bad solution. It will be slow, because I do not have any amount limits for category in my application.
Do you have any solutions?
Thanks a lot!
I am using an array adapter and to this am adding an array list of string s , the list is multi select , How can i get the values of list items clicked ?
my_contacts_list.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
ArrayAdapter<String> adapter=new ArrayAdapter<String>(this, android.R.layout.simple_list_item_multiple_choice,conts_list);
my_contacts_list.setAdapter(adapter);
I was trying to do this ,
SparseBooleanArray positions = my_contacts_list.getCheckedItemPositions();
int size=positions.size();
int i=0;
while(i <= size){
conts_list.get(positions.get(i));
i++;
}
But position.get(i) is an array list , how to retrieve the selected items then ?
SparseBooleanArray.get returns a boolean, but I believe you need to check it for each position in your list, e.g.
int len = listView.getCount();
SparseBooleanArray checked = listView.getCheckedItemPositions();
for (int i = 0; i < len; i++)
if (checked.get(i)) {
String item = cont_list.get(i);
/* do whatever you want with the checked item */
}
This API is a mess. Here is what works for me.
SparseBooleanArray checked = tags.getCheckedItemPositions();
for (int i = 0; i < checked.size(); i++) {
if(checked.valueAt(i)) {
Tag tag = (Tag) tags.getItemAtPosition(checked.keyAt(i));
Log.i("xxxx", i + " " + tag);
}
}
I believe the fastest way to get the info out of this SparseArray is to iterate over the keys (actually I'm fairly sure that the solutions above won't work in all cases). The ListView will enter a pair (index, true) into the SparseBooleanArray for every selected index.
So the code might look like this:
SparseBooleanArray checked = lv.getCheckedItemPositions();
int size = checked.size(); // number of name-value pairs in the array
for (int i = 0; i < size; i++) {
int key = checked.keyAt(i);
boolean value = checked.get(key);
if (value)
doSomethingWithSelectedIndex(key);
}
I think the Answer from Daren Robbins is Wrong, here is my answer:
ArrayList<String> ids = extras.getStringArrayList("commonids");
SparseBooleanArray checked = lv.getCheckedItemPositions();
for (int i = 0; i < checked.size(); i++) {
if(checked.get(i))
Log.i("CheckedItem", ids.get(checked.indexOfKey(i)));
}
Assume ids is an arraylist with the same size of the listview containing the ids of the items in the list view
The thing is you must iterate all the list view items but not checkedPositions.
Define the variables:
listView (The instance of you ListView)
names (the ArrayList you are )
saveCheckedName (save all checked name to this Arraylist)
SparseBooleanArray checkedPositions = listView.getCheckedItemPositions();
for (int i = 0; i < subjectListView.getCount(); i++) {
if (checkedPositions.get(i) == true) {
saveCheckedName.add(names.get(i));
}
}
Like so many other things, multi-select ListViews are a real problem in Android.
Instead of simply requesting the selected items as a List of Objects (dear Google, this is what we expect):
List selected_items = my_list_view.getSelectedItems();
we are forced to use this stupendously ridiculous API:
SparseBooleanArray checked = my_list_view.getCheckedItemPositions();
int num_selected = 0;
for(int i = 0; i < checked.size(); i++) {
if(checked.valueAt(i)) {
num_selected++;
int key = checked.keyAt(i);
boolean value = checked.get(key);
if (value) {
//
}
}
}
The horribly named SparseBooleanArray is populated by calling the even more horribly named getCheckedItemPositions() on the ListView. But instead of returning the positions of each selected/checked item in the list, it returns the position of every item in the list that WAS EVER touched, whether it is currently actually selected or not! Unbelievable, but true.
To calculate whether the item is ACTUALLY CURRENTLY checked, we are forced to test valueAt(i) for truthiness while looping through the 'was ever touched' array of items.
In addition to this madness, if we want to calculate the number of selected items, we appear to be forced to increment our own counter (e.g. num_selected).
With APIs like this one, it's little wonder developers are an angry lot!
I think another option is to just keep track of all of this yourself.
list.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> listView, View selectedItem,
int position, long itemId) {
//Keep a reference here, and toggle a global variable.
HOW I SOLVED THE ISSUE with a second ArrayList :
Created a second ArrayList instance
Updated that ArrayList instance with the UNCHECKED items
added it to the my listadapter
public void removeSelectedItems(){
updatedList = new ArrayList<String>(); //initialize the second ArrayList
int count = lv.getCount(); //number of my ListView items
SparseBooleanArray checkedItemPositions = getListView().getCheckedItemPositions();
for (int i=0;i < count;i++){
if(!checkedItemPositions.get(i))
updatedList.add(liveNames.get(i)); //liveNames is the current ArrayList
Log.e("TEST", liveNames.get(i));
}
adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_multiple_choice, updatedList);
setListAdapter(adapter);}
Hope it will be helpfull :)
Foo objectAtCheckedRow = null;
for (int i = 0; i < positions.size(); i++) { //positions.size() == 2
objectAtCheckedRow = adapter.getItem(positions.keyAt(i));
//Do something significant with object here
}
A couple things to understand
It's a key-value pair list.
The key is the index of a row, get it with positions.keyAt(i)
The value is whether the row at that index is checked or not(true or false), get it with positions.valueAt(i)
positions.get(i) returns the same boolean as .valueAt(i)
Careful not to get indexes mixed up. You do not need to(and should not) iterate over your whole list. Use int i to iterate over positions, but don't use i to get objects from your list
But in this specific case(listView.getCheckedPositions()) it only fills in true(checked rows), so you don't actually need to verify using .get(i) nor .valueAt(i)
Example:
Let's say you've checked the 5th and 8th items in the list(index 4 and 7), then positions.size() == 2 and i will be 0 and then 1
So when:
i == 0 then keyAt(i) == 4
i == 1 then keyAt(i) == 7
i == 0 OR i == 1 then valueAt(i) == true AND get(i) == true
FYI, Here is how Google did it:
Excerpted from http://mytracks.googlecode.com/hg/MyTracks/src/com/google/android/apps/mytracks/util/Api11Adapter.java
/**
* Gets the checked positions in a list view.
*
* #param list the list view
*/
private int[] getCheckedPositions(ListView list) {
SparseBooleanArray positions = list.getCheckedItemPositions();
ArrayList<Integer> arrayList = new ArrayList<Integer>();
for (int i = 0; i < positions.size(); i++) {
int key = positions.keyAt(i);
if (positions.valueAt(i)) {
arrayList.add(key);
}
}
int[] result = new int[arrayList.size()];
for (int i = 0; i < arrayList.size(); i++) {
result[i] = arrayList.get(i);
}
return result;
}
and here is my adapted version:
public static List<Integer> getAbsListViewCheckedItemPositions(AbsListView absListView) {
SparseBooleanArray checked = absListView.getCheckedItemPositions();
List<Integer> positions = new ArrayList<>();
int checkedSize = checked.size();
for (int i = 0; i < checkedSize; i++) {
if (checked.valueAt(i)) {
positions.add(checked.keyAt(i));
}
}
return positions;
}
We use this in our Android utility class. The generics help prevent compiler warnings, but you can remove them if your adapter returns multiple types.
public static <T> Collection<T> getCheckedItems(ListView listView) {
Collection<T> ret = new ArrayList();
SparseBooleanArray checkedItemPositions = listView.getCheckedItemPositions();
for (int i = 0; i < checkedItemPositions.size(); i++) {
if (checkedItemPositions.valueAt(i)) {
T item = (T) listView.getAdapter().getItem(checkedItemPositions.keyAt(i));
ret.add(item);
}
}
return ret;
}
Very simple, use below code
listViewRequests.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
AppCompatCheckedTextView checkBox = (AppCompatCheckedTextView) view;
if (checkBox.isChecked() == true){
Log.i("CHECK",checkBox.isChecked()+""+checkBox.getText().toString());
}
}
});
for(int i =0; i< listView.getAdapter().getCount(); i++){
if(listView.isItemChecked(i)){
listView.getAdapter().getItem(i); // item
}
}
should be used after setAdapter() method
I have created a simple Spinner binding it to a SimpleCursorAdapter. I'm populating the SimpleCursorAdapter with a list of towns from a content provider.
When I go to save the users selection I'm planning on saving the row id that is being populated into my SimpleCursorAdapter.
I'm using the following code to get the ID.
townSpinner.getSelectedItemId();
What I can not figure out is how best to set the selection when I pull back up the saved item.
The following code works but it only sets selection by position number.
townSpinner.setSelection(2);
Should I just create a loop to determine the correct position value based on Id?
long cityId = Long.parseLong(cursor.getString(CityQuery.CITY_ID));
for (int i = 0; i < citySpinner.getCount(); i++) {
long itemIdAtPosition2 = citySpinner.getItemIdAtPosition(i);
if (itemIdAtPosition2 == cityId) {
citySpinner.setSelection(i);
break;
}
}
I think you've answered your own question there!
Just write your own setSelectionByItemId method using the code you posted
Example:
DB:
public Cursor getData() {
SQLiteDatabase db = getReadableDatabase();
String sql = "select ID _id, Name from MyTable order by Name ";
Cursor c = db.rawQuery(sql, null);
c.moveToFirst();
return c;
}
Activity:
Cursor myCursor = db.getData();
SimpleCursorAdapter adapter1 = new SimpleCursorAdapter(
this,
android.R.layout.simple_spinner_item,
myCursor,
new String[] { "Name" }, new int[] { android.R.id.text1 }, 0);
adapter1.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
mySpinner.setAdapter(adapter1);
for(int i = 0; i < adapter1.getCount(); i++)
{
if (adapter1.getItemId(i) == myID )
{
mySpinner.setSelection(i, false); //(false is optional)
break;
}
}
Android Spinner set Selected Item by Value
The spinner provides a way to set the selected valued based on the position using the setSelection(int position) method. Now to get the position based on a value you have to loop thru the spinner and get the position. Here is an example
mySpinner.setSelection(getIndex(mySpinner, myValue));
private int getIndex(Spinner spinner, String myString){
int index = 0;
for (int i=0;i<spinner.getCount();i++){
if (spinner.getItemAtPosition(i).equals(myString)){
index = i;
}
}
return index;
}
If you are using an ArrayList for your Spinner Adapter then you can use that to loop thru and get the index. Another way is is to loop thru the adapter entries
Spinner s = (Spinner) findViewById(R.id.spinner_id);
for(i=0; i < adapter.getCount(); i++) {
if(myString.trim().equals(adapter.getItem(i).toString())){
s.setSelection(i);
break;
}
}