Develop Reference

How to populate ListView in a fragment from PHP JSON data?

I have a fragment (homePageFrag) containing a ListView . When I'm trying to populate it using JSON data from a URL, it's not working. The ListView is being empty. However, it is showing up when I'm giving static data from an ArrayList.
What I want to achieve is populating the ListView inside a Fragment from JSON data obtained from a URL. The HP_JSON_Download is working as intended was I'm using a ListView in a Activity, but in the fragment, its not showing up any data.
homePageFrag.java
public class homePageFrag extends Fragment implements HP_JSON_Download.download_complete {
boolean open = false; Context applicationContext;
public ListView list;
public ArrayList<HPEntity> countries = new ArrayList<HPEntity>();
public HP_ListAdapter adapter;
private final String bus_id[] = {"a1"};
private final String bus_destination[] = {"A1"};
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
//returning our layout file
View view = inflater.inflate(R.layout.homepage_lv, container, false);
list = (ListView) view.findViewById(R.id.homepageListView);
adapter = new HP_ListAdapter(this);
list.setAdapter(adapter);
HP_JSON_Download download_data = new HP_JSON_Download((HP_JSON_Download.download_complete) this);
download_data.download_data_from_link("http://www.xyz.in/MyApi/Api.php");
return view;
}
#Override
public void onViewCreated(View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
//you can set the title for your toolbar here for different fragments different titles
getActivity().setTitle("E-RTC");
}
public void get_data(String data) {
Toast.makeText(getApplicationContext(),"xx",Toast.LENGTH_SHORT).show();
try {
JSONArray data_array=new JSONArray(data);
for (int i = 0 ; i < data_array.length() ; i++) {
JSONObject obj=new JSONObject(data_array.get(i).toString());
HPEntity add=new HPEntity();
add.name = obj.getString("id");
add.code = obj.getString("name");
countries.add(add);
}
adapter.notifyDataSetChanged();
} catch (JSONException e) {
e.printStackTrace();
}
}
public Context getApplicationContext() {
return applicationContext;
}
}
HP_ListAdapter.java
public class HP_ListAdapter extends BaseAdapter {
homePageFrag main;
Context mContext;
public HP_ListAdapter(Context mContext) {
this.mContext = mContext;
}
HP_ListAdapter(homePageFrag main) {
this.main = main;
}
#Override
public int getCount() {
return main.countries.size();
}
#Override
public Object getItem(int position) {
return null;
}
#Override
public long getItemId(int position) {
return 0;
}
static class ViewHolderItem {
TextView name;
TextView code;
}
#Override
public View getView(int position, View convertView, ViewGroup parent){
ViewHolderItem holder = new ViewHolderItem();
if (convertView == null) {
LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.homepage_item, null);
holder.name = (TextView) convertView.findViewById(R.id.busID);
holder.code = (TextView) convertView.findViewById(R.id.busNAME);
convertView.setTag(holder);
} else {
holder = (ViewHolderItem) convertView.getTag();
}
holder.name.setText(this.main.countries.get(position).name);
holder.code.setText(this.main.countries.get(position).code);
return convertView;
}
}
HPEntity.java
public class HPEntity {
String name;
String code;
}
HP_JSON_Download.java
public class HP_JSON_Download implements Runnable {
public download_complete caller;
public interface download_complete {
void get_data(String data);
}
HP_JSON_Download(download_complete caller) {
this.caller = caller;
}
private String link;
public void download_data_from_link(String link) {
this.link = link;
Thread t = new Thread(this);
t.start();
}
public void run() {
threadMsg(download(this.link));
}
private void threadMsg(String msg) {
if (!msg.equals(null) && !msg.equals("")) {
Message msgObj = handler.obtainMessage();
Bundle b = new Bundle();
b.putString("message", msg);
msgObj.setData(b);
handler.sendMessage(msgObj);
}
}
private final Handler handler = new Handler() {
public void handleMessage(Message msg) {
String Response = msg.getData().getString("message");
caller.get_data(Response);
}
};
public static String download(String url) {
URL website;
StringBuilder response = null;
try {
website = new URL(url);
HttpURLConnection connection = (HttpURLConnection) website.openConnection();
connection.setRequestProperty("charset", "utf-8");
BufferedReader in = new BufferedReader(
new InputStreamReader(
connection.getInputStream()));
response = new StringBuilder();
String inputLine;
while ((inputLine = in.readLine()) != null)
response.append(inputLine);
in.close();
} catch (Exception e) {
return "";
}
return response.toString();
}
}

I would suggest you to modify your adapter like this.
public class HP_ListAdapter extends BaseAdapter {
public ArrayList<HPEntity> countries = new ArrayList<HPEntity>();
Context mContext;
public HP_ListAdapter(Context mContext, ArrayList<HPEntity> countries) {
this.mContext = mContext;
this.countries = countries;
}
#Override
public int getCount() {
return countries.size();
}
#Override
public Object getItem(int position) {
return countries.get(position);
}
#Override
public long getItemId(int position) {
return position;
}
static class ViewHolderItem {
TextView name;
TextView code;
}
#Override
public View getView(int position, View convertView, ViewGroup parent){
ViewHolderItem holder = new ViewHolderItem();
if (convertView == null) {
LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.homepage_item, null);
holder.name = (TextView) convertView.findViewById(R.id.busID);
holder.code = (TextView) convertView.findViewById(R.id.busNAME);
convertView.setTag(holder);
} else {
holder = (ViewHolderItem) convertView.getTag();
}
holder.name.setText(this.countries.get(position).name);
holder.code.setText(this.countries.get(position).code);
return convertView;
}
}
Now initialize your adapter from your onCreateView function in your Fragment like this. You are passing the wrong context to your adapter initialization by using this. You should have used getActivity() instead.
adapter = new HP_ListAdapter(getActivity(), countries);

How to retrieve data from Image Adapter when a particular item is clicked in a grid view and pass it to another activity?

MainActivityFragment.java
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
GridView gridView = (GridView) rootView.findViewById(R.id.grid_view_movies);
final ImageAdapter mAdapter= new ImageAdapter(getActivity(),listMovie);
gridView.setAdapter(mAdapter);
gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View v,
int position, long id) {
String movieInfo= listMovie.get(position);
Intent i = new Intent( getActivity() ,DetailsMovies.class)
.putExtra(Intent.EXTRA_TEXT, movieInfo);
startActivity(i);
}
});
return rootView;
}
private void sendJsonRequest() {
//In the case of theMovieDB it is JSON Object Request
//Specify several argument in JSON Object Request
JsonObjectRequest request = new JsonObjectRequest(Request.Method.GET,
getRequestUrl("vote_average"),
new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
parseJsonResponse(response);
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
}
});
requestQueue.add(request);
}
private void parseJsonResponse(JSONObject response) {
if (response == null || response.length() == 0) {
return;
}
long id = -1;
String title = Constants.NA;
String releaseDate = Constants.NA;
String synopsis = Constants.NA;
String urlThumbnail = Constants.NA;
String rating = Constants.NA;
try {
if (response.has(KEY_RESULTS)) {
JSONArray jsonArray = response.getJSONArray(KEY_RESULTS);
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject currentMovies = jsonArray.getJSONObject(i);
//Get the id of the current movie
//If statement is used to check whether id is null or not.
if (currentMovies.has(KEY_ID) && !currentMovies.isNull(KEY_ID)) {
id = currentMovies.getLong(KEY_ID);
}
//Get the synopsis of the current movie
if (currentMovies.has(KEY_OVERVIEW) && !currentMovies.isNull(KEY_OVERVIEW)) {
synopsis = currentMovies.getString(KEY_OVERVIEW);
}
//Get the title of the current movie
if (currentMovies.has(KEY_TITLE) && !currentMovies.isNull(KEY_TITLE)) {
title = currentMovies.getString(KEY_TITLE);
}
//Get the urlThumbnail of the current movie
if (currentMovies.has(KEY_POSTER_PATH) && !currentMovies.isNull(KEY_POSTER_PATH)) {
urlThumbnail = currentMovies.getString(KEY_POSTER_PATH);
}
//Get the release date of the current movie
if (currentMovies.has(KEY_RELEASE_DATE) && !currentMovies.isNull(KEY_RELEASE_DATE)) {
releaseDate = currentMovies.getString(KEY_RELEASE_DATE);
}
//Get the rating of current movie
if (currentMovies.has(KEY_VOTE_AVERAGE) && !currentMovies.isNull(KEY_VOTE_AVERAGE)) {
rating = currentMovies.getString(KEY_VOTE_AVERAGE);
}
//Create movie object
movie=new Movie();
movie.setId(id);
movie.setTitle(title);
movie.setUrlThumbnail("http://image.tmdb.org/t/p/w185/" + urlThumbnail);
movie.setReleaseDate(releaseDate);
movie.setOverview(synopsis);
movie.setRating(rating);
//This decides when to add movies to the ArrayList
if (id != -1 && !title.equals(Constants.NA)) {
listMovie.add(movie);
}
}
}
} catch (JSONException e) {
Log.e("error", e.getMessage());
}
}
public static String getRequestUrl(String sortby) {
return URL + sortby + UrlEndpoints.URL_PARAM + MyApplication.API_KEY;
}
//Base Adapter which is used to put poster in grid view
public class ImageAdapter extends BaseAdapter {
private Context mContext;
private ArrayList<Movie> movieItems;
public ImageAdapter(Context c, ArrayList<Movie> movieList) {
this.mContext = c;
this.movieItems = movieList;
}
public int getCount() {
return movieItems.size();
}
public Object getItem(int position) {
return movieItems.get(position);
}
public long getItemId(int position) {
return position;
}
// create a new ImageView for each item referenced by the Adapter
public View getView(int position, View convertView, ViewGroup parent) {
if (inflater == null) {
inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
if (convertView == null) {
convertView = inflater.inflate(R.layout.grid_item_movies, null);
}
mNetworkImageView = (NetworkImageView) convertView.findViewById
(R.id.networkImageView);
//Getting movie data for the row
Movie m = movieItems.get(position);
//Thumbnail Image
//ImageLoader is used to load the images from json object retrieved.
imageLoader=VolleySingleton.getInstance().getImageLoader();
mNetworkImageView.setImageUrl(m.getUrlThumbnail(), imageLoader);
return convertView;
}
}
}
DetailActivityFragment.java
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView= inflater.inflate(R.layout.fragment_details_movies, container, false);
Intent intent=getActivity().getIntent();
if(intent!=null && intent.hasExtra(Intent.EXTRA_TEXT))
{
mMovieStr= intent.getStringExtra(Intent.EXTRA_TEXT);
TextView t = (TextView) rootView.findViewById(R.id.movie_detail);
t.setText(mMovieStr);
}
return rootView;
}
I am unable to retrieve details of movie from image adapter. Is there any way by which i can pass the movie title,synopsis,image url to another activity when user click the particular movie poster.

I think there is a problem in here.
String movieInfo= listMovie.get(position);
You arraylist listMovie is a list of Movie object so each object is Movie
Movie movieSelected = listMovie.get(position);
String moviveInfo = movieSelected.getInfor();
String moviceTitle = movieSelected.getTitle();
...
Hope this help

Problem is you are passing list object to a string??
Get details from list and pass parse object to their datatypes
Like:
movie title,synopsis,image url
for above three get from list object and then pass to a new Activity.
Hope this work!

Custom Adapter not working for the listview from Parse.com

I am trying to create an android application using a database from Parse.com. I am using a custom adapter to create a listview. I don't find any errors with the code and yet the listeview is not showing up. Nothing there in the logcat as well. Just the listview does not show up.
lv = (ListView)findViewById(R.id.listView);
mProgress = (ProgressBar)findViewById(R.id.check_progress);
mProgress.setVisibility(View.VISIBLE);
ParseQuery<ParseObject> query = new ParseQuery<ParseObject>("Sellers");
query.orderByAscending("Name");
query.findInBackground(new FindCallback<ParseObject>() {
#Override
public void done(List<ParseObject> parseObjects, ParseException e) {
if (e == null) {
studentsList = new ArrayList<Sellers>();
for (ParseObject ob : parseObjects) {
s = new Sellers();
s.setName(ob.getString("Name").toString());
s.setAddress1(ob.getString("Address1").toString());
s.setAddress2(ob.getString("Address2").toString());
s.setShopName(ob.getString("ShopName").toString());
s.setEmail(ob.getString("Email").toString());
s.setPhone(ob.getString("Phone").toString());
s.setZipcode(ob.getString("Zipcode").toString());
studentsList.add(s);
}
adapter = new ListviewAdapter(CheckStatus.this, studentsList);
lv.setAdapter(adapter);
mProgress.setVisibility(View.GONE);
} else {
mProgress.setVisibility(View.GONE);
Toast.makeText(getApplicationContext(), e.getMessage(), Toast.LENGTH_SHORT).show();
}
}
});
This is the activity where I am invoking the listview.
public class ListviewAdapter extends BaseAdapter{
private final static String TAG = ListviewAdapter.class.getSimpleName();
private Context activity;
private LayoutInflater inflater = null;
private List<Sellers> sellers;
int layout;
public ListviewAdapter(Context activity, List<Sellers> sellers) {
this.activity = activity;
this.sellers = sellers;
inflater = LayoutInflater.from(activity);
}
#Override
public int getCount() {
return 0;
}
#Override
public Object getItem(int position) {
return null;
}
#Override
public long getItemId(int position) {
return 0;
}
public class ViewHolder {
TextView name ;
TextView shop ;
TextView address1 ;
TextView address2;
TextView phone;
TextView email;
RelativeLayout rl;
}
#Override
public View getView(int position, View view, ViewGroup parent) {
View v =view;
ViewHolder holder = new ViewHolder();
if (view == null) {
LayoutInflater li = (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = li.inflate(R.layout.list_item_layout,null);
holder.name = (TextView)v.findViewById(R.id.seller_name);
holder.shop = (TextView)v.findViewById(R.id.shop_name);
holder.address1 = (TextView)v.findViewById(R.id.address1);
holder.address2 = (TextView)v.findViewById(R.id.address2);
holder.phone = (TextView)v.findViewById(R.id.phone);
holder.email = (TextView)v.findViewById(R.id.emailID);
v.setTag(holder);
} else {
holder = (ViewHolder) v.getTag();
}
Sellers s = sellers.get(position);
// String a = s.Name;
// Log.d(TAG, a);
holder.name.setText(s.getName());
holder.shop.setText(s.getShopName());
holder.address1.setText(s.getAddress1());
holder.address2.setText(s.getAddress2());
holder.phone.setText(s.getPhone());
holder.email.setText(s.getEmail());
Log.d("CustomAdapter.class", "CustomAdapter");
// imageView.setImageDrawable(s.getPic());
return v;
}
}
And this is the custom adapter. There are no null pointer exceptions showing up in the logcat. I can't determine why the listview is not getting populated.

Try this;
#Override
public int getCount() {
return sellers.size();
}
#Override
public Object getItem(int position) {
return position;
}
#Override
public long getItemId(int position) {
return position:
}

You have to implement your code on getCount() by return number of item listview will be created.

Array Adapter doesn't call GetView

I have
public class MainActivity extends FragmentActivity
I wrote Loader class which implements AsyncResponse:
public class Loader implements AsyncResponse {
public Activity contextActivity;
Loader(Activity context) {
this.contextActivity = context;
}
Class "Loader" has method "DrawTabInfo" which calling from AsyncResponse callback.
public void drawTabInfo(String jsonBlob, int tabId)
{
JSONObject dataJsonObj;
PullToRefreshListView list = null;
try {
dataJsonObj = new JSONObject(jsonBlob);
JSONArray jsonData = dataJsonObj.getJSONArray("steals");
ArrayList<JSONObject> data = new ArrayList<JSONObject>();
for (int i=0;i<jsonData.length();i++){
data.add(jsonData.getJSONObject(i));
}
Adapter adapter = new Adapter(contextActivity, data);
LayoutInflater inflater = LayoutInflater.from(contextActivity);
if (tabId == 0) {
View view = inflater.inflate(R.layout.listviewlayout, null, false);
list = (PullToRefreshListView) view.findViewById(R.id.listView);
}
if (tabId == 1) {
View view = inflater.inflate(R.layout.listviewlayout2, null, false);
list = (PullToRefreshListView) view.findViewById(R.id.listView2);
}
list.setAdapter(adapter);
adapter.setNotifyOnChange(true);
Log.d("COUNT") shows - "4", what means array is built fine.
public class Adapter extends ArrayAdapter<JSONObject> {
private final Activity context;
private final ArrayList<JSONObject> profiles;
public String header;
public String preText;
public String imageURL;
static class ViewHolder {
public TextView header;
public ImageView image;
public TextView preText;
public LinearLayout linearItemLayout;
}
public Adapter(Activity context, ArrayList<JSONObject> array) {
super(context, R.layout.tab1_list_layout, array);
Log.d("ADAPTER", "SETTING ADAPTER");
this.context = context;
this.profiles = array;
Log.d("COUNT", "" + profiles.size());
}
#Override
public int getCount()
{
return profiles.size();
}
My getView method:
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View rowView = convertView;
Log.i("GetView Log", "Adapters GetView hasbeen called");// thats never calling
if (rowView == null) {
LayoutInflater inflater = context.getLayoutInflater();
rowView = inflater.inflate(R.layout.tab1_list_layout, null);
ViewHolder viewHolder = new ViewHolder();
viewHolder.linearItemLayout = (LinearLayout) rowView.findViewById(R.id.linearItemLayout);
viewHolder.header = (TextView) rowView.findViewById(R.id.itemHeader);
viewHolder.image = (ImageView) rowView.findViewById(R.id.itemPreImage);
viewHolder.preText = (TextView) rowView.findViewById(R.id.itemPreText);
rowView.setTag(viewHolder);
}
ViewHolder holder = (ViewHolder) rowView.getTag();
JSONObject item = null;
try {
item = profiles.get(position);
header = item.getString("header");
preText = item.getString("previewText");
imageURL = item.getString("previewImageUrl");
} catch (JSONException e) {
e.printStackTrace();
}
Log.d("ADAPTER LOG", header);
holder.header.setText(header);
holder.preText.setText(preText);
int headerHeight = (int) Math.round(header.length() * 1.5);
holder.linearItemLayout.setMinimumHeight(40 + headerHeight + preText.length());
Picasso.with(context).setIndicatorsEnabled(true);
Picasso.with(context).load(imageURL).resize(140,100).into(holder.image);
return rowView;
}
In MainActivity i calling, where "this" = MainActivity;
Loader loader = new Loader(this);
loader.loadTabInfo(0);
Method getView never calling. What I'am doing wrong?
UPD:
Solved:
public void drawTabInfo(String jsonBlob, int tabId)
{
JSONObject dataJsonObj;
PullToRefreshListView list = null;
try {
dataJsonObj = new JSONObject(jsonBlob);
JSONArray jsonData = dataJsonObj.getJSONArray("steals");
ArrayList<JSONObject> data = new ArrayList<JSONObject>();
for (int i=0;i<jsonData.length();i++){
data.add(jsonData.getJSONObject(i));
}
Adapter adapter = new Adapter(contextActivity, data);
//LayoutInflater inflater = LayoutInflater.from(contextActivity);
if (tabId == 0) {
//View view = inflater.inflate(R.layout.listviewlayout, null, false);
list = (PullToRefreshListView) contextActivity.findViewById(R.id.listView);

Your code is fine .. just you need a little bit change in get view method
add a return statement.. like return rowView;
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View rowView = convertView;
Log.d("GETVIEaW", "GETVIEW");
if (rowView == null) {
LayoutInflater inflater = context.getLayoutInflater();
rowView = inflater.inflate(R.layout.tab1_list_layout, null);
ViewHolder viewHolder = new ViewHolder();
viewHolder.linearItemLayout = (LinearLayout) rowView.findViewById(R.id.linearItemLayout);
viewHolder.header = (TextView) rowView.findViewById(R.id.itemHeader);
viewHolder.image = (ImageView) rowView.findViewById(R.id.itemPreImage);
viewHolder.preText = (TextView) rowView.findViewById(R.id.itemPreText);
rowView.setTag(viewHolder);
}
else{
viewHolder = (ViewHolder) rowView.getTag();
}
viewHolder.preText.setText("Type your name");
return rowView;
}

Are you sure that Log.d() is not called? You may want to change logging scope, usually default scope is info and it doesn't show debug messages. You can try to use Log.i() or change scope.

Try posting your adapter.setNotifyOnChange(true); to handler. Follow this link

Get parent layout from custom Adapter

Could anybody explain me, how to realize?
I have an activity with listview and footer with some elements(textview).
Listview built with custom adapter. Each listview item has few elements. And my question: how can i change textview in footer, from custom adapter, when i clicking on some listview's element?
Thx a lot!
/**** My adapter ****/
public class MyListAdapter extends ArrayAdapter<Product> implements UndoAdapter {
private final Context mContext;
private HashMap<Product, Integer> mIdMap = new HashMap<Product, Integer>();
ArrayList<Product> products = new ArrayList<Product>();
final int INVALID_ID = -1;
LayoutInflater lInflater;
String imagePath;
public MyListAdapter(Context context, int textViewResourceId, List<Product> prod) {
//super(context, textViewResourceId, prod);
super(prod);
lInflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
mContext = context;
for (int i = 0; i < prod.size(); i++) {
//add(prod.get(i));
mIdMap.put(prod.get(i),i);
}
}
#Override
public long getItemId(final int position) {
//return getItem(position).hashCode();
Product item = (Product) getItem(position);
return mIdMap.get(item);
}
#Override
public boolean hasStableIds() {
return true;
}
#Override
public View getView(final int position, View convertView, final ViewGroup parent) {
ViewHolder holder = null;;
Product p = getItem(position);
if (convertView == null) {
convertView = lInflater.inflate(R.layout.item, null);
//convertView.setBackgroundResource(R.drawable.rounded_corners);
int currentTheme = Utils.getCurrentTheme(convertView.getContext());
switch (currentTheme) {
case 0:
convertView.setBackgroundResource(R.drawable.rounded_corners);
break;
case 1:
convertView.setBackgroundResource(R.drawable.border);
break;
default:
convertView.setBackgroundResource(R.drawable.rounded_corners);
break;
}
holder = new ViewHolder();
holder.tvDescr = (TextView) convertView.findViewById(R.id.tvDescr);
holder.list_image = (ImageView) convertView.findViewById(R.id.list_image);
holder.products_amount = (TextView) convertView.findViewById(R.id.amountDigits);
holder.products_price = (TextView) convertView.findViewById(R.id.priceDigits);
holder.ivImage = (ImageView) convertView.findViewById(R.id.ivImage);
holder.unit = (TextView) convertView.findViewById(R.id.unit);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
if(p.getProductImageBitmap() != null && p.getProductImageBitmap() != "") {
Log.d("PATH -- ", p.getProductImageBitmap());
ImageLoader imageLoader = ImageLoader.getInstance();
DisplayImageOptions options = new DisplayImageOptions.Builder().cacheInMemory(true)
.resetViewBeforeLoading(true)
.showImageForEmptyUri(R.drawable.ic_launcher)
.showImageOnFail(R.drawable.ic_launcher)
/*.showImageOnLoading(R.id.progress_circular)*/
.build();
imageLoader.displayImage(p.getProductImageBitmap(), holder.list_image, options);
} else {
holder.list_image.setImageResource(R.drawable.ic_launcher);
}
holder.tvDescr.setText(p.getProductName());
holder.ivImage.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
String deletedItem = getItem(position).getProductName();
MyListAdapter.this.remove(getItem(position));
if (MyListAdapter.this.getCount() > 0) {
Toast.makeText(mContext, deletedItem + " " + mContext.getString(R.string.deleted_item), Toast.LENGTH_SHORT).show();
MyListAdapter.this.notifyDataSetChanged();
} else {
Toast.makeText(mContext,mContext.getString(R.string.sklerolist_empty), Toast.LENGTH_SHORT).show();
}
}
});
//Функционал для большой картинки продукта
//открывается новое активити с большой картинкой
holder.list_image.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
imagePath = getItem(position).getProductImageBitmap();
if(imagePath != null && imagePath != "") {
Pattern normalPrice = Pattern.compile("^file");
Matcher m2 = normalPrice.matcher(imagePath);
if (m2.find()) {
Intent myIntent = new Intent(view.getContext(), ViewImage.class).putExtra("imagePath", imagePath);
view.getContext().startActivity(myIntent);
}
}
}
});
holder.products_price.setText(fmt(p.getProductPrice()));
holder.products_amount.setText(fmt(p.getProductAmount()));
holder.unit.setText(p.getProductUnit());
return convertView;
}
public static String fmt(double d){
if(d == (long) d)
return String.format("%d",(long)d);
else
return String.format("%s",d);
}
static class ViewHolder {
ImageView list_image;
TextView tvDescr;
TextView products_amount;
TextView products_price;
TextView unit;
ImageView ivImage;
ProgressBar circleProgress;
}
#NonNull
#Override
public View getUndoView(final int position, final View convertView, #NonNull final ViewGroup parent) {
View view = convertView;
if (view == null) {
//view = LayoutInflater.from(mContext).inflate(R.layout.undo_row, parent, false);
view = lInflater.inflate(R.layout.undo_row, parent, false);
}
return view;
}
#NonNull
#Override
public View getUndoClickView(#NonNull final View view) {
return view.findViewById(R.id.undo_row_undobutton);
}
public View getHeaderView(final int position, final View convertView, final ViewGroup parent) {
TextView view = (TextView) convertView;
//View view = convertView;
if (view == null) {
//view = (TextView) LayoutInflater.from(mContext).inflate(R.layout.list_header, parent, false);
//view = lInflater.inflate(R.layout.list_header, parent, false);
}
//view.setText(mContext.getString(R.string.header, getHeaderId(position)));
return view;
}
public long getHeaderId(final int position) {
return position / 10;
}
}

Your ListView has a listener for the click events on list elements.
#Override
public void onListItemClick(ListView l, View v, int position, long id) {
// Do something when a list item is clicked
}
But if you want to pas something else back from the adapter to the Activity or the Fragment that contains that ListView and Adapter, you should create a simple interface and set it as listener to your adapter. After that, set click events on your rows from within the adapter, and notify the Activity or Fragment using your own interface.
For example you have the interface defined like this
public interface OnItemClickedCustomAdapter {
public void onClick(ItemPosition position);
}
and in your Adapter class you will have a private member
private OnItemClickedCustomAdapter mListener;
and a method used to set the listener
public void setOnItemClickedCustomAdapter(OnItemClickedCustomAdapter listener){
this.mListener = listener;
}
From your Activity or Fragment where your ListView is defined, and your adapter is set, you will be able to call setOnItemClickedCustomAdapter with this as parameter, and there you go. Your activity will now listen for your events. To trigger an event, just call mListener.onClick() from your custom adapter. You can pass back data you need back to the Activity or Fragment, and from there you have access to your Header or Footer directly, and you can change the text on them.