Large Complex List Of Items In Android - android

Take the following example screen:
This screen is displaying all current offers, these offers are dynamic.
What would be the best way of implementing the 'Offer' item? Should I use a ListView with a custom ListItem or is there a better solution to handling a list of complex items like this?
Any help appreciated.

Create an adapter with a list that contains a cell layout.
public class ListObject {
public int layout;
... other fields;
}
public class MyAdapter extends ArrayAdapter<ListObject>
and in the getview method, inflate the view that is needed for the offer.
public View getView(...) {
ListObject lo = getItem(position);
convertview = inflater.inflate(lo.layout, null);
}
is this what your trying to do? if not explain your question a bit more.

Related

Listview data model updated but items not displaying

I have searched these forums for nearly 3 hours and seen several similar questions but none of the answers works for me.
I have a single Activity, with several card views. One of the card views has a Spinner with string values and a very simple ListView. The user selects a value from the Spinner, between 1 and 12. The ListView should then display a number of strings equal to the value selected, based on the position in the spinner list. For example, user selects 2nd item in spinner list and the ListView displays 2 strings. I have a custom adapter on the listview. The ListView itself initially displays a single row, which is correct. However, after the user selects a value from the spinner, the listview is not displaying the extra rows, it still only displays one row. The data for the ListView comes from an ArrayList. I have checked the data model of the adapter after the user selects a value and it has the correct number of entries, as does the ArrayList itself, yet no matter what I try the ListView itself still only display the first row. I have tried NotifyDataSetChanged and every variation of Invalidate without success.
The various code samples:
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
if (parent == spDoseFrequency){
Toast.makeText(this,String.valueOf(position),Toast.LENGTH_SHORT).show();
rebuildReminderTimesList(position + 1);
}
}
private void rebuildReminderTimesList(int numberOfTimes){
Toast.makeText(this,"yup",Toast.LENGTH_SHORT).show();
//reset selected item to position 1
myApp.iSelectedReminderTimeIndex = 0;
//clear array and list, then rebuild with hourly timeslots
iarrTimes = new int[numberOfTimes][2];
liReminderTimes.clear();
int startTime = 8;
for (int i = 0; i < numberOfTimes; i++){
iarrTimes[i][0] = startTime + i;
iarrTimes[i][1] = 0;
liReminderTimes.add(pad(startTime + i) + ":00");
}
//refresh the listview
myAdapter.notifyDataSetChanged();
}
public class ReminderListAdapter extends ArrayAdapter {
List<String> liTimes;
Context ctx;
LayoutInflater inf;
public ReminderListAdapter(Context ctx, List<String> liTimes) {
super(ctx, R.layout.reminder_time_listview, liTimes);
this.liTimes = liTimes;
this.ctx = ctx;
inf = LayoutInflater.from(ctx);
}
public void setLiTimes(List<String> liTimes){
this.liTimes = liTimes;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View view = convertView;
ViewHolder viewHolder;
if (view == null){
view = inf.inflate(R.layout.reminder_time_listview,parent,false);
viewHolder = new ViewHolder();
viewHolder.sTime = (TextView) view.findViewById(R.id.tvTime);
view.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) view.getTag();
}
viewHolder.sTime.setText(liTimes.get(position));
return view;
}
private static class ViewHolder{
TextView sTime;
}
}
Any help would be appreciated as this is driving me crazy.
Quick update to this question: I have just tested supplying the initial list more than one value but even then it only displays the first item. Is there perhaps a problem with using ListView inside a CardView object? All my other cards work fine, only the ListView one fails to display properly.
Also, I have tried amending the code so that instead of changing the number of elements in the list, it just changes the text in the string of the first element and this works fine. So the notifyDataSetChanged appears to be working, but it just won't display more than one item. A quick check of the Adapter.getCount() method also gives the correct number of elements back, but won't display them.
A lot of folks forget to do the notifyDataSetChanged() call, but you've got that. Are you using a custom adapter? If so, that makes this sound like an issue with one or more of the adapter's methods. In particular, it sounds like getCount or getView might not be returning what they should be. That could either be because of a flawed logic issue, the underlying data source isn't being updated correctly, or the underlying data source isn't the same object you think it is. Without seeing your adapter though, it's hard to diagnose.
I found the problem. I had several CardView objects inside a LinearLayout, which itself was inside a ScrollView. As soon as I removed the ScrollView, the List inside the Card displayed properly. This has unfortunately created another problem in that I can no longer scroll the page to see later cards, which I have not yet found a solution for, but that is a different topic.

Making clickable list of images

I want make a clickable and scrollable list of images. When image is clicked it should appear appropriate string in TextView.
I have list of Object which have images id and string id in itself:
public class MyClass implements Serializable {
private int imageId;
private int stringId;
//(...)
}
public ArrayList<MyClass> listOfObjects = new ArrayList<MyClass>();
How it is best to do? I do not know too much to go about it.
Thanks in advance.
PS: Sorry for my bad english.
You have to implement a custom list view. The list view shall consist of a custom layout, in which every line consists of a button. Then, you can assign each imageId to the buttons. Then, it can display the related text using the same index in the list.

How can i hide a listview item in android?

Hi friends i have a listview and the contents are fetched from a webservice call. In that webservice call, there are fields like
"OGType": "ORG" and "OGType": "GROUP"
If click a button, the listview must shows the item having "OGType": "ORG", and hide the item having "OGType": "GROUP". Hope you understand what i meant. Please anyone help me for that. Thanks in Advance.
Try to set new data (only with ORG) to adapter and then call
adapter.notifyDataSetChanged();
You can do it in your getView Method in your Adapter Class. That's the header
public View getView(int pos, View convertView, ViewGroup, parent)
There you can properly hide the element(s) you want, you know, using the method setVisibility()
For more help you can take a look here
You can create a custom adapter and pass data to it in the form of Array or ArrayList (ArrayList is better when dealing with Custom Adapters). Whenever you need to add or remove the data from ListView, just add or remove the item to or from you ArrayList and call notifyDataSetChanged() on your custom adapter and it will update the ListView automatically.
In your case, whenever you click a button, edit you ArrayList and call your custom adapter's method called notifyDataSetChanged() and that's it. You'll see every time you call this method ListView will refresh itself if you have made any changes to the data. Hope it helps.
NOTE - CUSTOM ADAPTER IS NOT COMPULSORY. ANY ADAPTER CAN BE USED e.g SimpleAdapter, ArrayAdapter etc.
You can use a visible list and filters lists. You should use "visible" for complete the BaseAdpter as always, then, you can change the pointer of visible to other list (all, filter...)
Don't worry by the memory, are pointers, you only have each element only once.
public class MyAdapter extends BaseAdapter {
private ArrayList<MyItem> visible;
private ArrayList<MyItem> all;
private ArrayList<MyItem> filter;
public MyAdapter(ArrayList<MyItem> items) {
all = items;
visible = all; //Set all as visible
filter = new ArrayList<Item>();
for (Item i : items)
if (i.getType().equals("ORG"))
filter.add(i);
}
//Complete adapter using "visible"
public void showOnlyOrg() {
visible = filter;
notifydatasetchanged();
}
}
The non hackish way will be to remove the items from your Collection which you use to generate the listview and then call notifyDataSetChanged();

Android List Refresh

I'm working on refreshing a list in Android but can't seem to get it right.
I've used notifyDataSetChanged(); at every point that I thought applicable (currently using dialogs for input), but it doesn't work, and I've got to the point of plastering it around all over the place and it still won't refresh.
Am I right in saying this should refresh the list while your looking at it, or it will rebuild the list and you still have to refresh the view?
If anyone has got any suggestions for the positioning of it in relation to constructing a list I'd be glad to hear.
Is this a ListActivity? I have a ListActivity in my project at the moment and I have my own adapter class within it that extends ArrayAdapter.
My experience is that calling notifyDataSetChanged() on my extended list adapter class instance does immediately cause a refresh of the list View being displayed. So, as soon as I call .notifyDataSetChanged() on my adapter instance, the list View is regenerated which therefore causes my adapter's implementation of getView() to be called to generate each individual row view again. So, the user selects a context menu item which triggers some change to the data and then a call to .notifyDataSetChanged(), and the screen instantly refreshes with the new data.
So to add some code snippets to be clear:
I have a ListActivity
public class VarListActivity extends ListActivity {
Within it, I extend ArrayAdapter
class VarAdapter extends ArrayAdapter{
...
#Override
public View getView(int position, View convertView, ViewGroup parent){
// Creates the views based upon myData
...
#Override
public int getCount(){
...
And I create an instance of that array adapter
la = new VarAdapter(this, R.layout.row0);
And when a context menu item is selected
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.a_context_menu_option:
// Does a call to perform modifications to myData
la.notifyDataSetChanged();
return true;
I'm just chucking this all down just in case it's of any similarity to your situation, but really we need to know a bit more about your code.

android listView another horizontal listView

I am looking for any way by which I can place android listView with TextView and another horizontal listView corresponding to that listView.
Actually I'm having a List of items and shops corresponding to that item I have sub categories.
And also a shop can have multiple sub categories like it,s different sub categories(child).
The situation to display is just like,
................................................
Eat(TEXT VIew)
Image Image Image (multiple categories in that item) .....
Name Name Name (multiple categories in that item)
............................................................
Use an ArrayAdaptor : look custom ListView on google : (first result) http://www.softwarepassion.com/android-series-custom-listview-items-and-adapters/
Basically you need to design the layout of your sublist in XML, then design the layout of your main ListView in XML.
I think you whould use wrap_content for your sublist, width : fill_parent for the main list and height : wrap_content for the main list.
Then you need two classes to hold your required data of each item (one for the main list containing one of your sublist).
Then you create ArrayList and ArrayList (stored in each MyMainItem).
Then you'll need to create two class extenting ArrayAdaptor :
MainAdapter extends ArrayAdaptor and SecondaryAdapter
In each of your ArrayAdapter you'll need to store the list of items and override the constructor like so :
private ArrayList<MyObj> items = new ArrayList<MyObj>();
public ArticlesAdapter(Context context, int textViewResourceId,
ArrayList<MyObj> items) {
super(context, textViewResourceId, items);
this.items = items;
}
In each adaptor, you'll have to override the method
#Override
public View getView(int position, View convertView, ViewGroup parent)
like shown in the tutorial
But don't forget in your MainAdapter to call the setAdaptor() on the subListView.
Be careful with the getView method : you are highly to receive a null object, so make sure to test it to avoid NullPointerException
Hope I helped you. This is worth a Bounty :-)
I think you can set in xml!
enter code here
android:divider="#null"
android:dividerheight="10dp"<-- space between items-->

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