Develop Reference

How to disable all elements (also the ones not currently visible in the screen) in a listview?

I have a ListView with a set of elements. When I click one of the I would like to disable all the others. If I click again on the selected item all the other items are enabled again.
I tried the different proposed solution without success. I hope someone can help me.
This is my code:
//action to take when a presentation is selected
listview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, final View view,
int position, long id) {
//disable the other items when one is selected
if(position!=selectedPresentation){
for(int i=0;i<parent.getCount();i++){
if(i!=position)//disable all the items except the select one
parent.getChildAt(i).setEnabled(false);
}
selectedPresentation=position;
}else if(selectedPresentation==position){
//enable again all the items
for(int i=0;i<parent.getCount();i++){
parent.getChildAt(i).setEnabled(true);
}
selectedPresentation=-1;
}
Where selectedPresentation is a global variable storing the selected item. If no item is selected its value is -1.
Thank you for your help!

Make your own subclass of ArrayAdapter that has AreAllItemsEnabled() return false, and define isEnabled(int position) to return false for a given item in your the ones you want to disable.
In your custom ArrayAdapter overide isEnabled method as following
#Override
public boolean isEnabled(int position) {
return false;
}
other option
Don't implement onItemclickListener. This will not give you any update of item click. Only register onClick listener to views.

You may take another object of the List(Arraylist) which is populating elements in listview then on click copy the corresponding position data to new arraylist you made and then notifyDataSet and when you click again you populate listview with original list so it will apear again....Just do this trick it might work for you

parent.getChildeAt() only work for visible Item.
you should change something in adapter.
if make custom adapter then you can do some thing like #ṁᾶƔƏň ツ answer, but if you use default adapter you can change adapter's arraylist that before you pass it to adapter.
put boolean in it (in arraylist) and in on item click true/false it for all item.

I wrote this solution and seems it works fine!
listview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, final View view,
int position, long id) {
//disable the other items when one is selected
Toast.makeText(context, "onClick called",Toast.LENGTH_SHORT).show(); // this will flash up twice
if(position!=selectedPresentation){
selectedPresentation=position;
for(int i=0;i<adapter.getCount();i++){
if(i!=position)//disable all the items except the select one
adapter.isEnabled(i);
}
}else if(selectedPresentation==position){
//enable again all the items
selectedPresentation=-1;
for(int i=0;i<adapter.getCount();i++){
adapter.isEnabled(i);
}
}
And in my adapter I wrote:
public boolean isEnabled(int position) {
if(selectedPresentation==-1 || selectedPresentation==position)
return true;
return false;
Now my concern is how to show the items in the listView as disabled

Highlighting the list item of a list view in android for a specif time

In my android application i'm having a list view and some items in that,now my requirement is when I select a particular item from that list the list item should be highlighted with a red color, and that selection should not be disappear because in my application i should choose an item from the list view and i should click a button(submit).
So in order to know to the user that he has selected an item from the list view it should be highlighted until he clicks submit button.
I have used choice Mode attribute and set the value to single choice and i have changed the color for highlighting everything works fine but i need it not to be disappeared until user clicks the submit button
The variable val consists of some names which i retrieved from database.
Please help me to solve this Thanks in advance.
ArrayAdapter<String> adptr= new ArrayAdapter<String>(this,R.layout.row,R.id.member_name,array);
lv.setAdapter(adptr);
lv.setOnItemClickListener(new OnItemClickListener(){
#Override
public void onItemClick(AdapterView<?> parent, View v, int pos,
long id) {
// TODO Auto-generated method stub
val=lv.getItemAtPosition(pos).toString();
//Toast.makeText(getApplicationContext(), val, 5000).show();
}
});

use OnItemClickListener
ListView lview = getListView();
int pos =0;
lview.setOnItemClickListener(new OnItemClickListener()
{
#Override
public void onItemClick(AdapterView<?> adapter, View v, int position,
long arg3)
{
// set the background of v here
if (position == pos)
// reset the background color
// and pos = position;
else
get the previous listitem view and reset it's background to original
}
});

Actually I had the same problem sometime back. I was working on non touch andorid ui application for google tv.
The solution is like this.
1) create a custom ArrayAdapter (extending ArrayAdapter)
2) onItemClick get the position of the item.
3) send that position to your adapter by some public method say setCurrentPosition(int pos)
4) in getView() of the adapter check for the position and set the background to red for that view.
Hope this will work as it worked for me.

listview getting new instance when swiping the listview

I have one listview in my application,it contains two rows one for task and another one for alarm,date,severity. Initially first row of the list item only displayed for all list item and the second one is invisible. When i click the list item the second row displayed for that item as well as click another list item at that time the above list item closed that second row. Its working fine for me...My problem is if i open one list item and then swipe the listview at then i click the another list item at that time the above one cannot be closed because the above list item instance will be chnaged.please any one help me how to solve this problem...
int lastselectedPosition == -1
#Override
public void onItemClick(AdapterView<?> arg0, View view, int position,
long id) {
TextView textviewDate=(TextView)view.findViewById(R.id.taskTimeidDaytoDay);
selectedtaskDate=textviewDate.getText().toString().trim();
if (lastselectedPosition == -1) {
Log.i(TAG,"Loopif:"+lastselectedPosition);
TextView twTaskTime = (TextView) view
.findViewById(R.id.taskTimeidDaytoDay);
TextView twSeverity = (TextView) view
.findViewById(R.id.severityidDaytoDay);
TextView twAlarm = (TextView) view
.findViewById(R.id.alarmidDaytoDay);
twAlarm.setVisibility(view.VISIBLE);
twSeverity.setVisibility(view.VISIBLE);
twTaskTime.setVisibility(view.VISIBLE);
lastselectedPosition = position;
lastSelectedItem = arg0.getChildAt(position);
} else {
// Log.i(TAG,"LoopElse:"+lastselectedPosition);
lastSelectedItem.findViewById(R.id.taskTimeidDaytoDay)
.setVisibility(lastSelectedItem.GONE);
lastSelectedItem.findViewById(R.id.severityidDaytoDay)
.setVisibility(lastSelectedItem.GONE);
lastSelectedItem.findViewById(R.id.alarmidDaytoDay).setVisibility(
lastSelectedItem.GONE);
if (lastselectedPosition != position) {
view.findViewById(R.id.taskTimeidDaytoDay).setVisibility(
view.VISIBLE);
view.findViewById(R.id.severityidDaytoDay).setVisibility(
view.VISIBLE);
view.findViewById(R.id.alarmidDaytoDay).setVisibility(
view.VISIBLE);
lastselectedPosition = position;
lastSelectedItem = arg0.getChildAt(position);
} else {
lastselectedPosition = -1;
lastSelectedItem = null;
}
}
GetView():
#Override
public View getView(int position, View view, ViewGroup parent) {
Log.i("XXXX", "Inside getView");
final DaytoDayTaskGetterSetter objDaytoDaygetset=getItem(position);
TextView textviewTask;
TextView txtviewAlarm ,txtviewTaskTime ,txtviewSeverity;
Log.i(TAG,"InsideGetView:"+position);
LayoutInflater inflater=(LayoutInflater)context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
if(view==null)
{
view=inflater.inflate(R.layout.daytodaylistlayout,null);
}
Log.i("XXXX", "before first test");
textviewTask=(TextView)view.findViewById(R.id.tasknameidDaytoDay);
txtviewAlarm=(TextView)view.findViewById(R.id.alarmidDaytoDay);
txtviewSeverity=(TextView)view.findViewById(R.id.severityidDaytoDay);
txtviewTaskTime=(TextView)view.findViewById(R.id.taskTimeidDaytoDay);
return view;
}
In first i click the "gdfgdtet" list item it show another row and then i click the second list item "dfgsdgsd" at that time the above list item "gdfgdtet" closed the second row.This is a normal output.Suppose if i open the "gdfgdtet" list item and then swipe the listview at that time both of "gdfgdtet" "dfgsdgsd" will be opened and crashed...because the above one list item reference changed when i am swiping please how to solve this problem...

I'll try to provide you a good answer that explains why you are having this problems, but the general idea is that you have to see this video - http://www.youtube.com/watch?v=wDBM6wVEO70
please take my words kindly - you don't seems to understand what ListView + BaseAdapter recycling mechanism is all about, and I strongly recommend you see the full video I linked you to, and read more about that.
in general, the specific problem in your code is that you are holding reference to listview item (lastSelectedItem), then trying to use it latter assuming it's still representing same list item. that's wrong. in that stage (after scrolling) the view already been recycled to represent another item in the list (based on the adapter implementation).
listView's number of childs is not the size of adapter.getCount()!!!!!!!!
listViews's number of childs = number of visible list items on screen + 1 + headers + footers
let's say you have the 5 first items visible on screen, then you are scrolling down. when you see the 7 item you actually see the same view instance that used to show the first list item and been recycled.
getView will call in this stage with convertView != null and position in the adapter to let you reuse the item by putting new values such different text/image to the same instance
this mechanism provides ability to display list of "infinite" number of items in the list, and holding in memory only a few number of views. imagine that you have list of 5000 items in the list, and each one of them have different view instance - you would get outOfMemory exception in a sec!
complete explanation about that would be hard to write in stackoverflow answer's context.
it just too long trying to explain one of the most important and complex UI components in android, but this links would be a good start:
http://www.youtube.com/watch?v=wDBM6wVEO70
How ListView's recycling mechanism works
http://mobile.cs.fsu.edu/the-nuance-of-android-listview-recycling-for-n00bs/
if you are interstead in "quick" fix for your specific problem, the solution would be:
hold in the data structure represents your list item additional field indicating if it in "close" or "open state. when item been clicked - change the data accordinly and call notifyDatasetChanged(). inside the getView() check if item is open or close and populate it accordinly
by the way - it's not only "quick fix" solution, but also the right thing to do anyway

You should pay attention to Tal Kanel's answer and consider this one to be an extension to it. His advice will help you in the long run.
Add a boolean field to DaytoDayTaskGetterSetter class:
public class DaytoDayTaskGetterSetter {
....
....
boolean open;
public DaytoDayTaskGetterSetter (.., .., boolean o) {
....
....
open = o;
}
....
....
public boolean shouldOpen() {
return open;
}
public void setOpen(boolean o) {
open = o;
}
}
In your getView(), check if the object has its open value set:
DaytoDayTaskGetterSetter obj = (DaytoDayTaskGetterSetter) getItem(position);
if (obj.shouldOpen()) {
// Set visibility to true for the items
} else {
// Set visibility to false for the items
}
On list item click, traverse the list and set open for all list items to false. Use the position to retrieve DaytoDayTaskGetterSetter and set its open to true:
#Override
public void onItemClick(AdapterView<?> arg0, View view, int position, long id) {
for (DaytoDayTaskGetterSetter obj : listContainingObjects) {
obj.setOpen(false);
}
DaytoDayTaskGetterSetter clickedItem = (DaytoDayTaskGetterSetter)
yourAdapter.getItem(position);
clickedItem.setOpen(true);
yourAdapter.notifyDataSetChanged();
}
Edit 1:
#Override
public void onItemClick(AdapterView<?> arg0, View view, int position, long id) {
DaytoDayTaskGetterSetter clickedItem = (DaytoDayTaskGetterSetter)
yourAdapter.getItem(position);
if (clickedItem.shouldOpen()) {
clickedItem.setOpen(false);
} else {
for (DaytoDayTaskGetterSetter obj : listContainingObjects) {
obj.setOpen(false);
}
clickedItem.setOpen(true);
}
yourAdapter.notifyDataSetChanged();
}

How to change other items in a Android ListView when one item is clicked

I have a ListView that contains items with checkboxes that should behave sometimes like a CHOICE_MODE_MULTIPLE and sometimes like a CHOICE_MODE_SINGLE. What I mean is for certain items in the list, when selected certain other items needs to be deselected whilst other can remain selected.
So when item A is checked I can find in my data the item B that needs to be unchecked but how do I get the UI to refresh to show this as I (I believe) cannot find the actual View that represents B but just it's data?

It sounds like you're off to a good start. You're right that you should be manipulating the underlying data source for item B when A is clicked.
Two tips that may help you:
Your getView() method in the Adapter should be looking at your data source and changing convertView based on what it finds. You cannot find the actual View that represents B because in a ListView, the Views are recycled and get reused as different data needs to be displayed. Basically, when an item is scrolled off the list, the View that was used gets passed to the getView() function as convertView, ready to handle the next element's data. For this reason, you should probably never directly change a View in a ListView based on user input, but rather the underlying data.
You can call notifyDataSetChanged() from within your adapter to signal that somewhere the underlying data has been changed and getView() should be called again for the elements currently displayed in your list.
If you're still having trouble, feel free to post some code that illustrates the specific problem that you're having. It's much easier to provide concrete advice when the problem is better defined. Hope this helps!

you can use singleChoice alartDialog, i have used like:
private int i = 0; // this is global
private final CharSequence[] items = {"Breakfast", "Lunch", "Dinner"}; // this is global
Button settings = (Button)view.findViewById(R.id.settings);
settings.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(final View v) {
AlertDialog.Builder builder = new AlertDialog.Builder(v.getContext());
//Title of Popup
builder.setTitle("Settings");
builder.setSingleChoiceItems(items, i,
new DialogInterface.OnClickListener() {
// When you click the radio button
public void onClick(DialogInterface dialog, int item){
i=item;
}
});
builder.setPositiveButton("Confirm",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int item) {
if (i == 0) {
//it means 1st item is checked, so do your code
}
if (i == 1) {
//it means 2nd item is checked, so do your code
} /// for more item do if statement
}
});
//When you click Cancel, Leaves PopUp.
builder.setNegativeButton("Cancel", null);
builder.create().show();
}
});
i have initialized i=0, so that for the very first time when user click on settings button, the first item is selected. and after then when user select other item, i have saved the i value so that next time when user click settings button, i can show user his/her previously selected item is selected.

I come across and solve this question today.
public class ItemChooceActivity extends Activity implements OnItemClickListener {
private int chosenOne = -1;
class Madapter extends BaseAdapter {
.....
.....
#Override
public View getView(final int position, View convertView,
ViewGroup parent) {
// TODO Auto-generated method stub
if (chosenOne != position) {
set the view in A style
} else {
set the view in B style
}
return convertView;
}
}
#Override
public void onItemClick(AdapterView<?> arg0, View view, int position,
long arg3) {
,,,,
chosenOne = position;
adapter.notifyDataSetChanged();
,,,
}
}

ListView stay selected?

I have a list view full of items, after the users selects an item it lights up, and then it goes back to normal. Is there a way to make it so that when the user selects an item in my ListView it stays selected, and highlighted?

Apparently the "disappearing selection" is by design; it's something called "touch mode". I read through that document and still I have no idea why they thought it was a good idea. My guess is that, since Android was originally designed for small-screen devices, they expected that you would fill the screen with a list and then, when the user clicks an item, move to a new list on a different screen. Thus, the user wouldn't be aware that Android lost track of the selected item.
But this behavior is quite annoying if, for example, you want the user to select an item and then show information about that item on the same screen. If the selection disappears, how is the user supposed to know what they clicked (assuming of course that users have the attention span of a goldfish)?
One possible solution is to change all the list items into radio buttons. I don't really like that solution because it wastes screen real estate. I'd rather just use the background color to show which item is selected. I have seen one solution so far but it is not quite complete or general. So here's my solution:
1. In your XML layout file
Go to your ListView element and the following attribute: android:choiceMode="singleChoice". I'm not entirely sure what this does (by itself, it doesn't allow the user to select anything) but without this attribute, the code below doesn't work.
2. Define the following class
It is used to keep track of the selected item, and also allows you to simulate pass-by-reference in Java:
public class IntHolder {
public int value;
public IntHolder() {}
public IntHolder(int v) { value = v; }
}
3. Put the following code somewhere
I'll assume you put it in your Activity, but it could go in any class really:
static void setListItems(Context context, AdapterView listView, List listItems, final IntHolder selectedPosition)
{
setListItems(context, listView, listItems, selectedPosition,
android.R.layout.simple_list_item_1,
android.R.layout.simple_spinner_dropdown_item);
}
static void setListItems(Context context, AdapterView listView, List listItems, final IntHolder selectedPosition,
int list_item_id, int dropdown_id)
{
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> list, View lv, int position, long id) {
selectedPosition.value = position;
}
});
ArrayAdapter<CharSequence> adapter = new ArrayAdapter<CharSequence>(context, list_item_id, listItems) {
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View itemView = super.getView(position, convertView, parent);
if (selectedPosition.value == position)
itemView.setBackgroundColor(0xA0FF8000); // orange
else
itemView.setBackgroundColor(Color.TRANSPARENT);
return itemView;
}
};
adapter.setDropDownViewResource(dropdown_id);
listView.setAdapter(adapter);
}
This code does two things: it attaches your list items (e.g. List<String>) to your ListView, and it overrides ArrayAdapter.getView() with some code that changes the background of the selected item.
4. Use that code to set up your list
For example:
ListView _list;
IntHolder _selectedItem = new IntHolder(-1); // nothing selected at first
#Override
protected void onCreate(Bundle savedInstanceState) {
...
_list = (ListView)findViewById(R.id.list);
List<String> items = Arrays.asList("Item 1", "Item 2", "Item 3");
setListItems(this, _list, items, _selectedItem);
}
That's all! The above assumes you want single selection. With some small modifications to getView(), you could support multi-selection too, I guess, but you should probably use checkboxes instead.
Warning: this solution needs further development. If the user uses arrow keys or buttons to select an item, that item will not be selected from the IntHolder's perspective. If the user presses the unlabeled button (what's the name of that button? "Enter"?) then the item will become "officially" selected but then you have another problem because if the user uses the arrow keys again, it will sort of look like two items are selected. Leave a comment if you figure out how to keep the "internal selection" in the IntHolder synchronized with the "keyboard selection" or whatever it's called. What is it called, anyway?

There is an attribute in ListView called listSelector:
Drawable used to indicate the currently selected item in the list.
http://developer.android.com/reference/android/widget/AbsListView.html#attr_android:listSelector
EDIT after Stan comment
To ensure that a ListView stays selected, you should
① Set the view's attribute choiceMode via xml or programmatically.
② Use an adapter that uses views which implement Checkable interface, like CheckedTextView (inside simple_list_item_single_choice layout).
File TestActivity.java
public class TestActivity extends Activity {
private static final int SINGLE_CHOICE = android.R.layout.simple_list_item_single_choice;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.test);
String[] items = {"test 1", "test 2", "test 3"};
ListAdapter adapter = new ArrayAdapter<String>(this, SINGLE_CHOICE, items);
ListView list = (ListView) findViewById(R.id.testList);
list.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
list.setAdapter(adapter);
}
}

Here a simpler solution than Qwertie's:
Do not rely on given selection mechanism. Do it yourself.
View mSelectedItemView = null; //class member variable
View mTouchedItemView = null; //class member variable
ListView v = (ListView) getActivity().findViewById(R.id.listView);
// select on click
v.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adapter,
View clickedViewItem, int position, long id) {
if (mSelectedItemView != null)
selectedItemView.setBackgroundColor(Color.WHITE);
clickedViewItem.setBackgroundColor(Color.YELLOW);
mSelectedItemView = clickedViewItem;
}
});
// highlight on touch
v.setOnTouchListener(new OnTouchListener() {
#Override
public boolean onTouch(View v, MotionEvent event) {
if (v instanceof ListView) {
ListView listView = (ListView) v;
// Find the child view that was touched (perform a
// hit test)
Rect rect = new Rect();
int childCount = listView.getChildCount();
int[] listViewCoords = new int[2];
v.getLocationOnScreen(listViewCoords);
int x = (int) event.getRawX() - listViewCoords[0];
int y = (int) event.getRawY() - listViewCoords[1];
View child;
for (int i = 0; i < childCount; i++) {
child = listView.getChildAt(i);
child.getHitRect(rect);
if (rect.contains(x, y)) {
View touchedView = child;
if (event.getAction() == MotionEvent.ACTION_DOWN) {
touchedView
.setBackgroundColor(Color.RED);
mTouchedItemView = touchedView;
} else if (event.getAction() == MotionEvent.ACTION_UP) {
mTouchedItemView
.setBackgroundColor(Color.WHITE);
}
}
}
}
return false;
}
});
Also this method only deals with clicks and will not work if the user uses the arrow keys.
Disclaimer: De-highlighting after touch does not work reliably.
Credits for the touching part go to ozik.dev:
Get Item from ListView only with OnTouchListener

just add this to your listview layout
android:listSelector="#drawable/selector_expandable_listview"
android:drawSelectorOnTop="true"

Use a Selector.XML File and this code:
//SetOnClickListner to catch Events
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
view.setSelected(true);
}
});

Just add this to your ListView:
android:listSelector="#color/my_color"

This answer is working try this one
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long arg3)
{
for(int a = 0; a < parent.getChildCount(); a++)
{
parent.getChildAt(a).setBackgroundColor(Color.TRANSPARENT);
}
view.setBackgroundColor(Color.GREEN);
}