Develop Reference

view of spinner doesn't gets updated

I am using spinners which are dependent on one another. So when i choose one value in a spinner A the arraylist of other spinners B,C,D change accordingly.
when I select item at position 1 on spinner B and then choose any other value in spinner A The data on spinner B gets updated. So I again choose item at position 1 on spinner B the view doesn't changes while selecting item at any other position changes the view. So the same index doesn't get updated value in this piece of code.
ArrayAdapter<String> myAdapterEmployer = new ArrayAdapter<String>(MainActivity.this,
android.R.layout.simple_list_item_1,employerlist);
myAdapterEmployer.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
employer.setAdapter(myAdapterEmployer);
employer.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener(){
#Override
public void onItemSelected(AdapterView<?> parent, View view,
int position, long id)
{
if(position > 0) {
employer1 = employer.getSelectedItem().toString();
employeridname = employdetail.get(employer1);
Sectorlist(employeridname);
}
}
#Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
This changes data of Sectorlist everytime a item is selected in employer.
And then any item is choosen in sectorlist.
ArrayAdapter<String> myAdaptersector = new ArrayAdapter<String>(MainActivity.this,
android.R.layout.simple_list_item_1,sectorlist);
myAdaptersector.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
sector.setAdapter(myAdaptersector);
sector.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener(){
#Override
public void onItemSelected(AdapterView<?> parent, View view,
int position, long id)
{
sector1=sector.getSelectedItem().toString();
String selectedsectortext = (String) parent.getItemAtPosition(position);
if(position > 0){
sectoridd=sectordetail.get(selectedsectortext);
}
}
#Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
Here when i choose item at same index as before it doesn't update in the spinner view.

Inside your onItemSelected of the spinner A you can set Adapter to other spinners to be update and this will work as you want.
employer.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener(){
#Override
public void onItemSelected(AdapterView<?> parent, View view,
int position, long id)
{
if(position > 0) {
employer1 = employer.getSelectedItem().toString();
employeridname = employdetail.get(employer1);
Sectorlist(employeridname);
// Update other spinners here
myAdaptersector = new ArrayAdapter<String>(MainActivity.this,
android.R.layout.simple_list_item_1,sectorlist);
myAdaptersector.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
sector.setAdapter(myAdaptersector);
}
}
#Override
public void onNothingSelected(AdapterView<?> parent) {
}
});

Android ListView Items select and reset

I've a problem with my simple application. It uses a listview that has to:
- open a new Activity when pressed and it's on view mode
- highlight the selected item when it's on edit mode
I'm doing the following:
ListView lv = (ListView)findViewById(R.id.categoryListView);
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
String entry = (String) parent.getItemAtPosition(position);
if (_editMode)
view.setBackgroundColor(Color.parseColor("#5B5B5B"));
else
{
Intent intent = new Intent(MainActivity.this, CategoryActivity.class);
intent.putExtra("CATEGORY", entry);
startActivity(intent);
}
}
});
Then I want that when I turn to view mode, all items must be deselected, and I do this:
for (int i = 0; i < lv.getAdapter().getCount(); i++)
{
lv.getChildAt(i).setBackgroundColor(Color.parseColor("#FFFFFF"));
}
But this is working fine only if all the items in listview are visible.
I've tried implementing this on the adapter without success...
Any suggestion?
Thanks!
EDIT
Ok after Jawad answer I just figured out how does "getView" method work. So this is the solution I've used:
I declared an arraylist containing selected items:
ArrayList<String> itemSelected = new ArrayList<String>();
This is the ListView onItemClick listener (where you can select and deselect items):
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
String entry = (String) parent.getItemAtPosition(position);
if (itemSelected.contains(entry))
{
itemSelected.remove(entry);
}
else
{
itemSelected.add(entry);
}
((ArrayAdapter<String>)lv.getAdapter()).notifyDataSetChanged();
}
});
This is the ovverride of getView method:
itmList.setAdapter(new ArrayAdapter<String>(this,R.layout.list_black_text,R.id.list_content, itmStrList){
#Override
public View getView(int position, View convertView, ViewGroup parent)
{
if (convertView != null)
{
if (itemSelected.contains(itmList.getAdapter().getItem(position))) {
convertView.setBackgroundColor(Color.RED);
} else {
convertView.setBackgroundColor(Color.parseColor("#5B5B5B"));
}
}
return super.getView(position, convertView, parent);
}
});
And this is how to deselect all items:
itemSelected.clear();
((ArrayAdapter<String>)lv.getAdapter()).notifyDataSetChanged();
Thank you man :)

I think your problem is your are not paying attention to view recycling. When you are changing the color of a view's background, the view can be recycled and you will have something not desired. Check this link for details.
You should have a, lets say boolean variable, in your underlyning data called something like isSelected. And add this code in your getView() method.
if(item.isSelected()){
setBackgroundColor(Color.parseColor("#5B5B5B"));
}
else{
setBackgroundColor(Color.parseColor("#FFFFFF"));
}
Then in your onItemClick add replace view.setback... by
lv.getAdapter().getItem(position).setSelected(true);
lv.getAdapter().notifyDataSetChanged();
You may need a cast.
Finally change this
for (int i = 0; i < lv.getAdapter().getCount(); i++)
{
lv.getChildAt(i).setBackgroundColor(Color.parseColor("#FFFFFF"));
}
to this:
for (int i = 0; i < lv.getAdapter().getCount(); i++)
{
lv.getAdapter().getItem(i).setSelected(false);
}
lv.getAdapter().notifyDataSetChanged();
The reason why your portion of code works only if all the items are visible is view recycling. Moreover lv.getChildAt() gives you only the views that are visible. Your code may then crash because adapter.getcount maybe bigger then the number of listview childs.
Hope it helps.

listView android clickable in one list and no clickable in other list

how to make listView clickable in one list and not clickable in other list if value is null or empty
ListView lv = getListView();
if (TAG_UID.isEmpty() && TAG_UID == null)
{
lv.setEnabled(false);
}
else
{
lv.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// getting values from selected ListItem
Intent in = new Intent(AllProductsActivity.this,
MyActivity2.class);
startActivity(in);
}
});
value get from mysql database, thanks for help

For the position you want make it non-clickable handle it in this manner using return statement
#Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
if(position==2){
return;
}else{
//put your code here
}
}

Get all views in listview in setOnItemClickListener

I am using below code to setcolor of a selected item of a listview. The rule is only one should be colored. But with below code if I select 2 views both get colored. Can you please help me get all other views in the listview so that when I click on certain view all other views i set to different color and the selected view i set a different color(Green in this case).
Please let me know if any other solution?
lv = (ListView) view.findViewById(R.id.listf);
lv.setAdapter(text![enter image description here][1]Adapter);
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
TextView v = (TextView) view.findViewById(R.id.template_text);
view.setBackgroundColor(Color.GREEN);
}
});

I resolved the problem using the below:
I put a loop where only the selected list item is set in RED whereas all others were set in Green, in this way only only one list item will be colored on selected.
lv = (ListView) view.findViewById(R.id.listf);
lv.setAdapter(Adapter);
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
for (int i = 0; i < 3; i++)
{
if (position == i)
{
parent.getChildAt(i).setBackgroundColor(Color.RED);
}
else
{
parent.getChildAt(i).setBackgroundColor(getResources().getColor(R.color.Dark_Green);
}
}
TextView v = (TextView) view.findViewById(R.id.template_text);
view.setBackgroundColor(Color.GREEN);
}
});

As you told you are not able to change adapter code, you can prefer solution 2.
Solution 1: Create one variable int selectedPosition and method setSelected in your adapter class
int selectedPosition = -1;
public void setSelected(int position)
{
selectedPosition = position;
notifyDatasetChanged();
}
Edit getView() of the adapter class and include following code
if(selectedPosition==position)
{
templateTextView.setBackgroundColor(Color.GREEN);
}
else templateTextView.setBackgroundColor(Color.BLUE);// default textView color
Solution 2: keep reference of previously selected textView as well each time change the color of currently selected textview to green andd previous one to blue
TextView previousSelected = null;
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
if(previousSelected!=null)
previousSelected.setBackgroundColor(Color.BLUE);
TextView v = (TextView) view.findViewById(R.id.template_text);
view.setBackgroundColor(Color.GREEN);
previousSelected = v;
}
});

How to Add a extra value to spinner

SOLVED HERE IS THE SOLUTION ANSWER http://www.congdegnu.es/2011/06/02/spinners-en-android-tres-formas-de-poblarlos/
I'm populating a spinner from my sqlite database like this:
Cursor CS = newDB.rawQuery("Select ID AS _id, Name from Schools",null);
CS.moveToFirst();
do{
Schools.add(CS.getString(CS.getColumnIndex("_id")));
} while(CS.moveToNext());
ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item,Schools);
dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner1.setAdapter(dataAdapter);
My problem is that I only add an id but how can I add a value to that id so when the value get select I get the id ?

I think that "schools" is an array containing you own class "school".
You could add a propertie which contains the information.
Or you could use a 2 dimensional array.
Than you have to set up your arrayadapter to get the information (getter Method).
Hope it helps

Try Cursor Adapter
or
Take a global variable
Hashmap schoolmap=new Hashmap();
While inserting data to the list also add to Hashmap like this
CS.moveToFirst();
do{
Schools.add(CS.getString(CS.getColumnIndex("_id")));
schoolmap.put(CS.getString(CS.getColumnIndex("_id")),CS.getColumnIndex("_id"))
} while(CS.moveToNext());
onSpinner item click get the value like this
spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> parent, View view,
int pos, long id) {
String value=((TextView)view).getText();
int id=Integer.parseInt(schoolmap.get(value));
}
public void onNothingSelected(AdapterView<?> parent) {
}
});

Take a look at using a SimpleCursorAdapter for your spinner instead. Although this has been deprecated since API-11, so you may also want to think about using a LoaderManager with a CursorLoader.
An explanation on how to transition to a LoaderManager and CursorLoader can be found here:
How to transition from managedQuery to LoaderManager/CursorLoader?
I would recommend you start by using the SimpleCursorAdapter, then if confortable enough, move on to the other method.

1) Create an ArrayList<School>
2) Add all your Schools to the Arraylist
3) Create a custom adapter like this:
public class SchoolAdapter extends ArrayAdapter<School>{
public SchoolAdapter(Context ctx, List<School> schools){
super(ctx, 0, schools);
}
#Override
public View getView(final int position, final View convertView, final ViewGroup parent) {
TextView tv;
if (convertView == null){
tv = new TextView(getContext());
} else {
tv = (TextView) convertView;
}
tv.setTextSize(16);
final School school = getItem(position);
tv.setText(school.toString());
return tv;
}
}
4) Use this in your activity:
final SchoolAdapter adapter = new SchoolAdapter(this, schools);
spinner.setAdapter(adapter);
spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> parent, View view,
int pos, long id) {
School school = adapter.getItem(pos);
// Do whatever you want with your school
}
public void onNothingSelected(AdapterView<?> parent) {
}
});