Develop Reference

Android Adding list item giving Error

I have two lists I am adding the item from the list1, when clicked, to the other list but when I click an item. program is ending with out any errors
debug shows exception error
Following is the code :-
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
String lst1[] = {"abdul","yousuf","khalid","john","egor"};
String lst2[]= {};
Double lp1[]={10.0,5.0,2.0,0.5,1.5};
Double lp12[]={};
ListView lis1= (ListView)findViewById(R.id.lv1);
ListView lis2= (ListView)findViewById(R.id.lv2);
ArrayAdapter<String> adapter1 =new ArrayAdapter<String>(MainActivity.this,android.R.layout.simple_list_item_1,lst1);
final ArrayAdapter<String> adapter2 =new ArrayAdapter<String>(MainActivity.this,android.R.layout.simple_list_item_1,lst2);
lis1.setAdapter(adapter1);
lis2.setAdapter(adapter2);
lis1.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
String item = ((TextView)view).getText().toString();
adapter2.add(item);
}
});
}

Because when you use
ArrayAdapter<String> adapter1 =new ArrayAdapter<String>(MainActivity.this,
android.R.layout.simple_list_item_1,lst2);`
// Internally a fixed size list will be generated ^^^^
then lst2 array will be converted to a fixed length list which cannot accept new entries
public More ...ArrayAdapter(Context context, int resource, int textViewResourceId, T[] objects) {
init(context, resource, textViewResourceId, Arrays.asList(objects));
// fixed length array
}
Read about asList
Solution :
ArrayAdapter<String> adapter1 =new ArrayAdapter<String>(MainActivity.this,
android.R.layout.simple_list_item_1,
new ArrayList<String>(Arrays.asList(lst1));
// Pass array as new mutable list
final ArrayAdapter<String> adapter2 =new ArrayAdapter<String>(MainActivity.this,
android.R.layout.simple_list_item_1,
new ArrayList<String>(Arrays.asList(lst2));

try this
lis1.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
String item =lst1[position];
adapter2.add(item);
}
});

here is solution
lis1.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
String item = ((TextView)view).getText().toString();
lst2.add(item);
adapter2.notifyDataSetChanged();
}
});

How do I pull the selected items from a simple_list_item_multiple_choice with checkboxes?

I am trying to pull the items selected in a multiple checkbox ListView but getcheckitempositions() keeps returning null.
Relevant code:
Checkbox binding:
final ListView list = (ListView) whoView.findViewById(R.id.listView);
ArrayAdapter<String> adapter;
adapter = new ArrayAdapter(this.getActivity(), android.R.layout.simple_list_item_multiple_choice, friendList);
list.setAdapter(adapter);
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
CheckedTextView checkedTextView = ((CheckedTextView) view);
checkedTextView.setChecked(!checkedTextView.isChecked());
}
});
Trying to pull the items:
ListView list = (ListView) whoView.findViewById(R.id.listView);
List<String> invited = new ArrayList<String>();
SparseBooleanArray checked;
if (list != null) {
checked = list.getCheckedItemPositions(); {
for (int i = 0; i <= checked.size(); i++) {
if (checked.valueAt(i)) {
invited.add(list.getAdapter().getItem(i).toString());
}
}
}
}
I suspect it has to do with the getcheckitempositions() pulling from the ListView and not the checkboxes, but I'm not sure how I would go about fixing this.

Android listview setOnItemClickListener

public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_campaign_list);
Campaign campaign_data[] = new Campaign[]
{
new Campaign(R.drawable.hlbb, "MSIG HLBB PA Extra"),
new Campaign(R.drawable.hlbb, "MSIG HLBB SSP Plus")
};
CampaignAdapter adapter = new CampaignAdapter(this, R.layout.listview_header_row, campaign_data);
listView1 = (ListView)findViewById(R.id.listView1);
listView1.setAdapter(adapter);
listView1.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
String item = ((TextView)view).getText().toString();
Toast.makeText(getBaseContext(), item, Toast.LENGTH_LONG).show();
}
});
}
I can run the code above without setonitemclicklistener function, when i add the setOnItemClickListener, it stopped working.What is the error?? I'm new in Android..Thx

I don't know how is your CampaignAdapter code, but you are trying to cast the row view which you are inflating into TextView. You should use your adapter to access the item using the position of element:
CampaignAdapter adapter = new CampaignAdapter(this, R.layout.listview_header_row, campaign_data);
listView1 = (ListView)findViewById(R.id.listView1);
listView1.setAdapter(adapter);
listView1.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
Campaign item = (Campaign) adapter.getItem(position);
// Now you can access to the campaing value that you want
// For instance, item.getText()
Toast.makeText(getBaseContext(), item.getText(), Toast.LENGTH_LONG).show();
}
});

Select all items using a button in a custom listview

I would like to select and deselect all the items in the listview using "SelectAll" and "DeselectAll" buttons. I wrote the code for SelectAll but it throws a NullPointException. I couldn't find the bug in my code. Can someone point out the error in my code.
final ListView list;
String[] listItems = { "Enabled" };
list = (ListView)findViewById(R.id.list);
list.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_multiple_choice, getResources().getStringArray(R.array.facilities)));
list.setItemsCanFocus(false);
list.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
list.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
CheckedTextView ctv = (CheckedTextView)arg1;
//other functionality!
}
});
OnClickListener clickListener = new OnClickListener() {
#Override
public void onClick(View view) {
int itemCount = getListView().getCount();
System.out.print(itemCount);
for (int i = 0; i < itemCount; i++){
list.setItemChecked(i, true);
//getListView().setItemChecked(i, chk.isChecked());
}
}
};
Button button = (Button) findViewById(R.id.selectAll);
button.setOnClickListener(clickListener);

try to use below code...
private OnClickListener checkAllCheckboxes = new OnClickListener()
{
public void onClick(View v)
{
ListView lv = getListView();
int size = getListAdapter().getCount();
if(lv.isItemChecked(0))
{
for(int i = 0; i<=size; i++)
{
lv.setItemChecked(i, false);
}
}
}
}
};

You Can create One ArrayList of data class
class data
{
boolean chekced=false
create setter and getter of this
}
Create ArrayList of Data Class intially Chekced is false in all arraylist items
When select is called set all items to true
Then moify adpater and call notifyDatasetChanged on listView
This is how you can do this

Remove ListView items in Android

Can somebody please give me an example code of removing all ListView items and replacing with new items?
I tried replacing the adapter items without success. My code is
populateList(){
results //populated arraylist with strings
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, results);
listview.setAdapter(adapter);
adapter.notifyDataSetChanged();
listview.setOnItemClickListener(this);
}
// now populating list again
repopulateList(){
results1 //populated arraylist with strings
ArrayAdapter<String> adapter1 = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, results1);
listview.setAdapter(adapter1);
adapter1.notifyDataSetChanged();
listview.setOnItemClickListener(this);
}
Here repopulateList() method will add to ListView items, but it doesn't remove/replace all ListView items.

You will want to remove() the item from your adapter object and then just run the notifyDatasetChanged() on the Adapter, any ListViews will (should) recycle and update on it's own.
Here's a brief activity example with AlertDialogs:
adapter = new MyListAdapter(this);
lv = (ListView) findViewById(android.R.id.list);
lv.setAdapter(adapter);
lv.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> a, View v, int position, long id) {
AlertDialog.Builder adb=new AlertDialog.Builder(MyActivity.this);
adb.setTitle("Delete?");
adb.setMessage("Are you sure you want to delete " + position);
final int positionToRemove = position;
adb.setNegativeButton("Cancel", null);
adb.setPositiveButton("Ok", new AlertDialog.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
MyDataObject.remove(positionToRemove);
adapter.notifyDataSetChanged();
}});
adb.show();
}
});

I think if u add the following code, it will work
listview.invalidateViews();
To remove an item, Just remove that item from the arraylist that we passed to the adapter and do listview.invalidateViews();
This will refresh the listview

You can use
adapter.clear()
that will remove all item of your first adapter then you could either set another adapter or reuse the adapter and add the items to the old adapter. If you use
adapter.add()
to add data to your list you don't need to call notifyDataSetChanged

int count = adapter.getCount();
for (int i = 0; i < count; i++) {
adapter.remove(adapter.getItem(i));
}
then call notifyDataSetChanged();

Remove it from the adapter and then notify the arrayadapter that data set has changed.
m_adapter.remove(o);
m_adapter.notifyDataSetChanged();

names = db.getSites();
la = new ArrayAdapter<String>(EditSiteList.this,
android.R.layout.simple_list_item_1, names);
EditSiteList.this.setListAdapter(la);
listview.invalidateViews();
this code works fine for me.

You should use only one adapter binded with the list of data you need to list
When you need to remove and replace all items, you have to clear all items from data-list using "list.clear()" and then add new data using "list.addAll(List)"
here an example:
List<String> myList = new ArrayList<String>();
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, myList);
listview.setAdapter(adapter);
listview.setOnItemClickListener(this);
populateList(){
List<String> result = getDataMethods();
myList.addAll(result);
adapter.notifyDataSetChanged();
}
repopulateList(){
List<String> result = getDataMethods();
myList.clear();
myList.addAll(result);
adapter.notifyDataSetChanged();
}

Try this code, it works for me.
public class Third extends ListActivity {
private ArrayAdapter<String> adapter;
private List<String> liste;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_third);
String[] values = new String[] { "Android", "iPhone", "WindowsMobile",
"Blackberry", "WebOS", "Ubuntu", "Windows7", "Max OS X",
"Linux", "OS/2" };
liste = new ArrayList<String>();
Collections.addAll(liste, values);
adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, liste);
setListAdapter(adapter);
}
#Override
protected void onListItemClick(ListView l, View v, int position, long id) {
liste.remove(position);
adapter.notifyDataSetChanged();
}
}

At first you should remove the item from your list. Later you may empty your adapter and refill it with new list.
private void add(final List<Track> trackList) {
MyAdapter bindingData = new MyAdapter(MyActivity.this, trackList);
list = (ListView) findViewById(R.id.my_list); // TODO
list.setAdapter(bindingData);
// Click event for single list row
list.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
final int position, long id) {
// ShowPlacePref(places, position);
AlertDialog.Builder showPlace = new AlertDialog.Builder(
Favoriler.this);
showPlace.setMessage("Remove from list?");
showPlace.setPositiveButton("DELETE", new OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
trackList.remove(position); //FIRST OF ALL REMOVE ITEM FROM LIST
list.setAdapter(null); // THEN EMPTY YOUR ADAPTER
add(trackList); // AT LAST REFILL YOUR LISTVIEW (Recursively)
}
});
showPlace.setNegativeButton("CANCEL", new OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
}
});
showPlace.show();
}
});
}

It's simple .First you should clear your collection and after clear list like this code :
yourCollection.clear();
setListAdapter(null);

You can also use listView.setOnItemLongClickListener to delete selected item.
Below is the code.
// listView = name of your ListView
listView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
#Override
public boolean onItemLongClick(AdapterView<?> parent, View view, int
position, long id) {
// it will get the position of selected item from the ListView
final int selected_item = position;
new AlertDialog.Builder(MainActivity.this).
setIcon(android.R.drawable.ic_delete)
.setTitle("Are you sure...")
.setMessage("Do you want to delete the selected item..?")
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which)
{
list.remove(selected_item);
arrayAdapter.notifyDataSetChanged();
}
})
.setNegativeButton("No" , null).show();
return true;
}
});

//try this:
String text = ( (TextView) view).getText().toString();
adapter.remove(text);