I'm parsing a web service to display in a listView backed by my own subclass of ArrayAdapter. The data is static ArrayList<Wait> in Application.java. You'll see it referenced by App.getWaits().
I use a simple refresh method for when there's new data. I've confirmed that it's being updated but it only renders if I navigate away and then return to the view.
In the past I've been able to refresh the listView by calling notifyDataSetChanged() on the adapter but right now none of these have worked for me. Thanks for taking a look... any ideas!?
//1 This is how I'd normally update the listView dynamically, but not tonight.
adapter.notifyDataSetChanged();
//2 It's the same thing really, so no good.
((WaitAdapter) list.getAdapter()).notifyDataSetChanged();
//3 Saw this as the answer to a similar question, doesn't work.
adapter.getWaits().clear();
adapter.getWaits().addAll(App.getWaits());
adapter.notifyDataSetChanged();
//4 Called in onCreate but tried a 2nd time in refresh() to manually reset adapter, doesn't work.
adapter = new WaitAdapter(getHost().getApplicationContext(), App.getWaits());
list.setAdapter(adapter);
//5 Kinda the same thing, new adapter, reset adapter... also no good.
WaitAdapter adapter = new WaitAdapter(getHost().getApplicationContext(), App.getWaits());
list.setAdapter(adapter);
//6 I read ArrayAdapter keeps its own reference to initial data object but this fails too.
adapter = null;
adapter = new WaitAdapter(getHost().getApplicationContext(), App.getWaits());
list.setAdapter(adapter);
*Update to share my WaitAdapter.java.
public class WaitAdapter extends ArrayAdapter<Wait> {
private LayoutInflater inflater;
private ArrayList<Wait> waits;
public WaitAdapter(Context context, ArrayList<Wait> data) {
super(context, R.layout.list_item_wait, data);
inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
waits = data;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = inflater.inflate(R.layout.list_item_wait, parent, false);
holder = new ViewHolder();
holder.checkpointName = (TextView) convertView.findViewById(R.id.checkpointName);
holder.delayAmount = (TextView) convertView.findViewById(R.id.delayAmount);
holder.timeReported = (TextView) convertView.findViewById(R.id.timeReported);
holder.dateReported = (TextView) convertView.findViewById(R.id.dateReported);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
Wait wait = waits.get(position);
holder.checkpointName.setText(wait.getName());
holder.delayAmount.setText(wait.getDelayInMinutes());
holder.timeReported.setText(wait.getTimeLabel());
holder.dateReported.setText(wait.getDateLabel());
return convertView;
}
#Override
public boolean isEnabled(int position) {
return false;
}
static class ViewHolder {
TextView checkpointName;
TextView delayAmount;
TextView timeReported;
TextView dateReported;
}
}
12/14/14 Update: General implementation background.
At launch the App class starts WaitAsyncTask, which parses remote XML to fill its ArrayList waits. I'll access these waits in a few places so this way I keep them global.
WaitFragment, working with WaitAdapter, displays waits in a ListView and listens for changes to waits. User's can post waits to the web service via an AlertDialog. A successful response executes WaitAsyncTask again, updating the waits object, triggering a WaitFragment refresh().
Console logs and the web service confirm this flow of control and that waits gets updated. If I leave WaitFragment then return, it shows the updated waits. The code posted with comments #1-6 are what I've tried inside of the refresh() to update the ListView.
I use this general approach with other data and fragments in this app and their UIs refresh as intended, but none are listViews. I'm not sure I could post more source without redacting most of it but I'll share my findings once I get it working. I haven't had trouble with ListView before, but it'll be something embarrassing for sure. Thanks to everyone who took a little time :)
Just create a method in Adapter class to update/refresh the listview as follows,
public class WaitAdapter extends ArrayAdapter<Wait> {
private LayoutInflater inflater;
private ArrayList<Wait> waits;
public WaitAdapter(Context context, ArrayList<Wait> data) {
super(context, R.layout.list_item_wait, data);
inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
waits = data;
}
/**
* Update content
*/
public void updateListContent(ArrayList<Wait> data)
{
waits = data;
notifyDataSetChanged();
}
}
In your acivity class, just call this adapter method to update the content. Refer the below code
Note:Dont clear the array content of the adapter.
//Dont clear the arraylist of adapter
adapter.updateListContent(App.getWaits());
This may help you.
Related
How can I show NEW tag after updating category from database. Like this image
Only after if my category get Updated and show for 24 hrs.
This is my Adapter of Categories
public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.viewHolder> {
ArrayList<RecipeModels> list;
Context context;
public RecyclerAdapter(ArrayList<RecipeModels> list, Context context) {
this.list = list;
this.context = context;
}
#NonNull
#Override
public viewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(context).inflate(R.layout.recycler_view_set,parent,false);
return new viewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull viewHolder holder, int position) {
RecipeModels models = list.get(position);
holder.imageView.setImageResource(models.getPic());
holder.textView.setText(models.getText());
holder.itemView.setOnClickListener(view -> {
// It is sending data to category activity.
//Intent intent = new Intent(context, CategoryActivity.class);
//intent.putExtra("title",fruits.get(position).getTitle());
//intent.putExtra("name", fruits.get(position).getName());
//context.startActivity(intent);
});
}
#Override
public int getItemCount() {
return list.size();
}
public static class viewHolder extends RecyclerView.ViewHolder{
ImageView imageView;
TextView textView;
public viewHolder(#NonNull View itemView) {
super(itemView);
imageView = itemView.findViewById(R.id.imageView);
textView = itemView.findViewById(R.id.textView);
}
}
}
I don't have any idea to do this. Any Idea or code to implement this? I can add more code if you want, but please help to solve this issue!
simply query your data layer for lastUpdated <= now() - 24hrs window. All the responses from DB would be new elements only.
If you want distinction b/w new and old data within 1 result set, you can use if-else in the query to set a boolean flag isNew. basically, something like
select D.id, (IF D.lastUpdated >= now() - 24hrs THEN 1 ELSE 0) AS isNew from table D;
where
LastUpdated is a column on table D of type timestamp.
And is filled by application while writing the data to DB.
This should better to offload on DB, rather than App, since DB can use indexes to do this filter rather quick.
The above answer assumes there is a DB associated with app
If that's not the case, you can't do this labelling since you app does not have any state to compute the diff with. All vectors are filled only when app starts
You can use DiffUtils in your adapter to get the Changed/Updated data.Based on that, you can set the visibility of "New" tag from your card.
class CategoriesAdapter(): BaseAdapter<Category>(
diffCallback = object : DiffUtil.ItemCallback<Category>()
{
override fun areItemsTheSame(oldItem: Category, newItem: Category): Boolean {
TODO("Not yet implemented")
}
override fun areContentsTheSame(oldItem: Category, newItem: Category): Boolean {
TODO("Not yet implemented") }
}) { }
This is how your Base Adapter's declaration will look like:
abstract class BaseAdapter<T>(
diffCallback: DiffUtil.ItemCallback<T>)
: ListAdapter<T, BaseViewHolder>(
AsyncDifferConfig.Builder<T>(diffCallback)
.setBackgroundThreadExecutor(Executors.newSingleThreadExecutor())
.build()
) { }
If possible, try and get a timestamp for each image from the server.
Then, compare it to the android system's current time.
Using an if else statement, if the time gap is within the 24 hour range, display the 'new' label. or else, set it to View.GONE.
Now, If that's not possible, You would have to create a database within the app itself which also creates its own time stamp of the images.
Then compare for each image and display label when necessary.
I have created my own custom adapter class in my android app and I am calling it from one of my activity. I am adding some elements to the view from the adapter class and I need to access those variables from my activity class.
Now, ideally I would expect it to fill the view and then execute the further code in my activity class, but adapter class is taking some time to populate the view and in the meanwhile further code in my activity class is getting executed where no such elements have been added yet.
How do I handle this situation? I come from a js background. Do we have something like promises in java?
According to the answers I have my changed my code to this:
public class HomeActivity extends Activity {
GridView grid;
String text[] = {"Calendar","Uber","Weather","News","Youtube","Clock","Email","Maps","Twitter","Facebook"};
String list_app_name[] = {"calendar","uber","weather","news","youtube","clock","email","maps","twitter","facebook"};
String id_button[] = {"button_calendar","button_uber","button_weather","button_news","button_youtube","button_clock","button_email","button_maps","button_twitter","button_facebook"};
int image[] = {R.drawable.social_icons1,R.drawable.social_icons2,R.drawable.social_icons3,R.drawable.social_icons4,
R.drawable.social_icons5,R.drawable.social_icons6, R.drawable.social_icons7,R.drawable.social_icons8,
R.drawable.social_icons9,R.drawable.social_icons10};
private DrawerLayout mDrawerLayout;
private ActionBarDrawerToggle mDrawerToggle;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_home);
//setting up the adapter for gridView
grid = (GridView)findViewById(R.id.simpleGrid);
ImageAdapter ia = new ImageAdapter(this,image,text,id_button);
grid.setAdapter(ia);
ia.notifyDataSetChanged();
try {
initStateOfApps();
} catch (JSONException e) {
e.printStackTrace();
}
}
public void initStateOfApps() throws JSONException {
Log.d("here","here");
ArrayList<String> list = getEnabledApps();
Log.d("apps",list.toString());
for(int i=0;i<list.size();i++) {
String app_name = list.get(i);
ToggleButton button=null;
if(app_name.equals("calendar")) {
button = (ToggleButton)findViewById(R.id.button_calendar);
button.setChecked(true);
}
}
}
}
So what is happening is that I am creating some toggle buttons that are getting populated in the ImageAdapter class that I wrote.
Once the ImageAdapter is called, I call the notifydatasetchanged() on the adapter in order to update the view.
What I am doing inside the adapter is giving each of the toggle buttons some custom ID I wrote in res/values/ids.xml.
After using setId on each of the toggle buttons, I try using that ID in my activity class but it gives me nullPointerException in the initStateOfApps() where I am trying to change the state of button.
So even after using the notifyDataSetChanged it is still behaving the same.
ImageAdapter.java
public class ImageAdapter extends BaseAdapter {
private Context context;
private final int item_image[];
private final String item_text[];
private final String button_id[];
public ImageAdapter(Context context, int item_image[], String[] item_text,String[] button) {
this.context = context;
this.item_image = item_image;
this.item_text = item_text;
this.button_id = button;
}
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View gridView;
if (convertView == null) {
gridView = new View(context);
// get layout from custom_gridview.xml
gridView = inflater.inflate(R.layout.item, null);
// set value into imageview
final ImageView image = (ImageView) gridView.findViewById(R.id.item_image);
image.setImageResource(item_image[position]);
// set value into textview
TextView text = (TextView) gridView.findViewById(R.id.item_text);
text.setText(item_text[position]);
final ToggleButton button_ = (ToggleButton) gridView.findViewById(R.id.item_button);
if(position==0) {
button_.setId(R.id.button_calendar);
image.setId(R.id.image_calendar);
}
button_.setOnCheckedChangeListener( new CompoundButton.OnCheckedChangeListener()
{
#Override
public void onCheckedChanged(CompoundButton toggleButton, boolean isChecked)
{
if(context.getResources().getResourceEntryName(toggleButton.getId()).equals("button_calendar")) {
if(isChecked) {
try {
setStateOfApp("calendar","true");
} catch (JSONException e) {
e.printStackTrace();
}
Intent intent = new Intent(context, GoogleApp.class);
((Activity) context).startActivityForResult(intent,10);
} else {
try {
setStateOfApp("calendar","false");
} catch (JSONException e) {
e.printStackTrace();
}
}
}
}
}
} else {
gridView = (View) convertView;
}
return gridView;
}
}
You are trying to access View which is not a part of Activity's content view. So you can't access that view directly.
button = (ToggleButton)findViewById(R.id.button_calendar); // will return null
This ToggleButton will be null because findViewById will fail to find out ToggleButton in current content view because that view is present in your Adapter not in content view.
And you are getting nullpointerException because you are trying to access property on null view.
button.setChecked(true); // This button is null
In java we have <Future>, but I don't think it's what you're looking for.
The adapter (extending BaseAdaper) behaviour lets you create the adapter and, even in a second moment, change underlying data via getAdapter().setData() or whatever method you choose to add.
From this perspective, the adapter is a "stupid" component acting as A View containers, you should retrieve data elsewhere (CursorAdapter is different).
So, in your Activity, fill the adapter with needed data and, when finished, call adapter.notifyDatasetChanged(). This will inform the adapter that its own data has changed and it must refresh views
Yes, ideally, the population of the adapter should be coming from the outside. The adapter should really just take in a list of data and map that data to the views. For example, some method or task in the Activity could produce a list of data (probably asynchronously...since you mentioned it) that you then pass into the adapter and then you can notifyDataSetChanged() if you need to.
I can't see your code, but if for some reason the data is truly required to be populated from inside the adapter, you could use an event bus and subscribe to it in the Activity. I would recommend going with the first option, but here are some links if you choose to use an event bus:
https://github.com/greenrobot/EventBus
http://square.github.io/otto/
As per my understanding with your question
You are not properly managed the adapter data in your activity.
If any of the data or code interlinked with your adapter data or values
Then you can start those code after you retrieve the values or data and update the view in your activity.
Please note that use Viewholders in adapter to avoid slow populating and scrolling in listviews.
Viewholders will smooth your process.
I personally suggest you that
Please go with Recyclerview and RecyclerViewAdapter.
So many Android developers are using it.
If you have background tasks in adapter you can prefer to use RX Java or EventBus
If you provide the code
It's better for us to suggest exact solution
i want to ask, why my code doesnt work when running on device, but when i run on emulator android like a Genymotion, it's working perfectly..
someone said on this link like this : you cannot call methods on the Activity superclass until after super.onCreate(), except in certain situations. Please postpone your initialization of promptsView until after super.onCreate() has been called.
i still dont get it, please tell me if you have the same problems..
anyway , i'm sorry if my explanation is bad..
public class DestinationListAdapter extends ArrayAdapter<DestinationModel> {
Context context;
int layoutResourceId;
List<DestinationModel> data = Collections.emptyList();
public DestinationListAdapter(Context context, int layoutResourceId, List<DestinationModel> data) {
super(context, layoutResourceId, data);
this.layoutResourceId = layoutResourceId;
this.context = context;
this.data = data;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View row = convertView;
DestinationHolder holder = null;
if(row == null)
{
// Predicted Error At Line Below
LayoutInflater inflater = ((Activity)context).getLayoutInflater();
row = inflater.inflate(layoutResourceId, parent, false);
holder = new DestinationHolder();
holder.destination_id = (TextView) row.findViewById(R.id.destination_id);
holder.destination_name = (TextView) row.findViewById(R.id.destination_name);
row.setTag(holder);
}
else
{
holder = (DestinationHolder)row.getTag();
}
DestinationModel weather = data.get(position);
holder.destination_id.setText(weather.getDestination_id());
holder.destination_name.setText(weather.getDestination_name());
return row;
}
for make sure when return back & continuing previous activity
i just Added & checking for getContext()!=null
Here's an good example :
Before block
adapter = new ExampleAdapter(getContext());
adapter.setData(items);
listView.setAdapter(adapter);
And better replace for getActivity()!=null
For example:
if (getActivity()!=null){
adapter = new ExampleAdapter(getActivity());
adapter.setData(items);
listView.setAdapter(adapter);
}
I think this is solved all problem which got the same error like my problems !
Be conscious of where in the lifecycle you are. The value of getContext() may not be available yet.
For example, in a DialogFragment, the context will not be available until onCreateDialog() is called. So don't try and create an adapter in the constructor, because the context will still be null at that point.
Actually this issue come when something comes as null byte.
and when we are using recycler view then it comes mostly. Because most people confuse in onCreateView of RecyclerViewAdpater.
Some code writers write Layout inflater as the layout of Tab. but here we will use another layout where we will mention our internal Recyclerview layout.
view= LayoutInflater.from(mcontext).inflate(R.layout.**item_tab14**,parent,false);
I have watched Android developer's videos on animating ListView insertion and deletion on YouTube. These have had very complex code in them and I tried searching for something else and found this.
http://karnshah8890.blogspot.fi/2013/04/listview-animation-tutorial.html
It has pretty simple implementation that works in most parts. My problem is that when I insert a new item in the ArrayList that is supplied to the ArrayAdapter, all the existing elements get reinserted due to adapter.notifyDataSetChanged()... I think. When I insert an entry in the ListView, how do I prevent all the entries from getting animated again? I just want the new one to animate in.
I use my ListView in the code this way:
toggles = (ListView) v.findViewById(R.id.toggleListView);
adapter = new ToggleListAdapter(getActivity(), toggleTasks);
toggles.setAdapter(adapter);
When a new item is inserted, I update the ArrayList (toggleTasks) and then call notifyDataSetChanged() on the adapter.
toggleTasks.add(task);
adapter.notifyDataSetChanged();
Here is my getView() method from the ArrayAdapter.
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
ToggleTask task = toggles.get(position);
String startActionName = "";
String finishActionName = "";
int imageDrawableId = -1;
// Deleted the part where I get the values for those three variables above
final Holder holder;
if(convertView == null) {
convertView = inflater.inflate(R.layout.mute_toggles_toggle_view, null);
holder = new Holder();
holder.image = (ImageView) convertView.findViewById(R.id.image);
holder.startAction = (TextView) convertView.findViewById(R.id.startAction);
holder.finishAction = (TextView) convertView.findViewById(R.id.finishAction);
convertView.setTag(holder);
} else {
holder = (Holder) convertView.getTag();
}
holder.image.setImageResource(imageDrawableId);
holder.startAction.setText(startActionName);
holder.finishAction.setText(finishActionName);
Animation animation = AnimationUtils.loadAnimation(getContext(), R.anim.listview_push_left_in); // Third animation example on the site linked earlier
animation.setDuration(500);
convertView.startAnimation(animation);
animation = null;
return convertView;
}
in the ArrayAdatper class add a global integer (I'll call it changedIndex) and create getter and setters for it. Then before you add an item to the list say adapter.setChangedIndex(index) (whatever you name your setter). You are essentially telling it ahead of time which one you want to animate.
Change this in getView
if(changedIndex == position){
Animation animation = AnimationUtils.loadAnimation(getContext(), R.anim.listview_push_left_in); // Third animation example on the site linked earlier
animation.setDuration(500);
convertView.startAnimation(animation);
animation = null;
}
then change
toggleTasks.add(task);
adapter.notifyDataSetChanged();
to
toggleTasks.add(task);
toggles.getPosition(task);
adapter.notifyDataSetChanged();
*I haven't checked any of this code but I believe it should work
Well if you want to animate only the last item inserted, then before animating check if it is last item in the List.
if (position == getCount() - 1) {
Animation animation = AnimationUtils.loadAnimation(getContext(), R.anim.listview_push_left_in); // Third animation example on the site linked earlier
animation.setDuration(500);
convertView.startAnimation(animation);
animation = null;
}
Use the ListViewAnimations library. After setting up your ListView and ListAdapter like this:
MyListAdapter mAdapter = new MyListAdapter(this, getItems());
SwingRightInAnimationAdapter swingRightInAnimationAdapter = new SwingRightInAnimationAdapter(mAdapter);
// Assign the ListView to the AnimationAdapter and vice versa
swingRightInAnimationAdapter.setAbsListView(getListView());
getListView().setAdapter(swingRightInAnimationAdapter);
Call AnimationAdapter.setShouldAnimateFromPosition(int position) somewhat like this:
swingRightInAnimationAdapter.setShouldAnimateFromPosition(swingRightInAnimationAdapter.getCount());
swingRightInAnimationAdapter.add(myItem);
Have a look at the wiki for more information about how to use the library.
In one of my android activity, I've a ListView lvFeedsList.
Each row element in the listView will contain 3 textViews - RSSFeedName, publishDate & feedLength
The contents of the feeds is retrived from a HTTPRsponse.
I'm fetching this response in an AsyncTask.
So, in the doInBackground(), I've send the HTTPRequest & received & parsed the response & prepared the ArrayList containing 3 above mentioned information.
Then inside the doInBackground() only, I'm creating the customized ArrayAdapter for forming the 3 TextViews in row element.
My intetions are to set this adapter on ListView in onPostExecute().
But, when I run the application, the ListView does not display anything.
I tried to debug & it seems like getView() in the ArrayAdapter class is not getting called. (But I'm not sure if this is the reason).
Here is the code, sorry for the length...it seemed necessary.
Activity Code:
public class GenericFeedsActivity extends Activity{
private ListView lvFeedsList;
private ArrayList<FeedsClass> feedList;
protected void onCreate(Bundle savedInstanceState) {
...
lvFeedsList = (ListView) findViewById(R.id.lvFeedsList);
lvFeedsList.setOnItemClickListener(this);
lvFeedsList.setEnabled(false);
...
new AsyncResponseHandler(this).execute();
}
class AsyncResponseHandler extends AsyncTask {
Context context;
FeedListAdapter adapter;
public AsyncResponseHandler(Context c) {
this.context = c;
}
#Override
protected Object doInBackground(Object... params) {
...
/*
* Sending HTTPRequest to a URL & getting list of feeds
* Saving this list of feeds in a ArrayList -feedList, containing elements of type FeedsClass (declared above)
* Below line parses the HTTPResponse XML & stores various information in feedList.
*/
feedList = utils.parseRssResponseXML(in); // Working fine, geeting elements
adapter = new FeedListAdapter(
GenericFeedsActivity.this, feedList);
in.close();
return null;
}
protected void onPostExecute(Object e) {
// Setting Arrayadapter
lvFeedsList.setAdapter(adapter);
lvFeedsList.setEnabled(true);
}
}
}
Adapter Code:
public class FeedListAdapter extends ArrayAdapter {
private Context context;
private ArrayList<FeedsClass> feedList;
public FeedListAdapter(Context c, ArrayList<FeedsClass> data) {
super(c, R.layout.rowlayout);
this.context = c;
this.feedList = data;
}
class ViewHolder {
TextView tvFeedName;
TextView tvFeedPubDate;
TextView tvFeedLength;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View row = convertView;
ViewHolder holder = null;
if (row == null) {
LayoutInflater inflator = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
row = inflator.inflate(R.layout.rowlayout, null);
holder = new ViewHolder();
holder.tvFeedName = (TextView) row.findViewById(R.id.tvFeedName);
holder.tvFeedPubDate = (TextView) row.findViewById(R.id.tvFeedPubDate);
holder.tvFeedLength = (TextView) row.findViewById(R.id.tvFeedLength);
row.setTag(holder);
} else {
holder = (ViewHolder) row.getTag();
}
// Getting values of feedName, publishDate & feedLength
String feedName = feedList.get(position).getTitle();
String feedDate = feedList.get(position).getPublishDate();
String feedLength = feedList.get(position).getStreamLength();
holder.tvFeedName.setText(feedName);
holder.tvFeedPubDate.setText(feedDate);
holder.tvFeedLength.setText(feedLength);
}
return row;
}
}
The issue is that you are subclassing ArrayAdapter. This doesn't work because ArrayAdapter internally thinks you do not have any elements in your data; it doesn't just magically know to look in the lvFeedsList variable because the data set it uses is internal.
Instead, in your constructor make sure to call this constructor instead:
Adapter code:
public FeedListAdapter(Context c, ArrayList<FeedsClass> data) {
super(c, R.layout.rowlayout, data); // add 'data'
this.context = c;
this.feedList = data;
}
Which will make everything work correctly.
adapter.notifyDataSetChanged()
could help at the end on of AsyncResponseHandler.onPostExecute(). If not - check whether ArrayList which hold data for adapter is empty or not.