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.
This question is related to
android
android-listview
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();
}
});
}
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
It's simple .First you should clear your collection and after clear list like this code :
yourCollection.clear();
setListAdapter(null);
You will want to remove()
the item from your adapter object and then just run the notifyDatasetChanged()
on the Adapter, any ListView
s will (should) recycle and update on it's own.
Here's a brief activity example with AlertDialog
s:
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();
}
});
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
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;
}
});
int count = adapter.getCount();
for (int i = 0; i < count; i++) {
adapter.remove(adapter.getItem(i));
}
then call 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.
Remove it from the adapter and then notify the arrayadapter that data set has changed.
m_adapter.remove(o);
m_adapter.notifyDataSetChanged();
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();
}
}
Source: Stackoverflow.com