Android - Custom Adapter and AsyncTask

Android - Custom Adapter and AsyncTask - android

I have a custom adapter and I need to use it in onPostExecute method to populate a ListView with an image and a text.
This is the Custom Adapter
import android.app.Activity;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import java.util.ArrayList;
public class MyAdapter extends BaseAdapter {
private Activity mActivity;
private ArrayList listaElementi;
private static LayoutInflater infilater = null;
public MyAdapter( Activity a, ArrayList list) {
mActivity = a;
listaElementi = list;
infilater = (LayoutInflater) mActivity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
#Override
public int getCount() {
return listaElementi.size();
}
#Override
public Object getItem(int position) {
return position;
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View vi = convertView;
if( convertView == null )
vi = infilater.inflate(R.layout.riga, null);
TextView nome = (TextView) vi.findViewById(R.id.nome);
ImageView immagine = (ImageView) vi.findViewById(R.id.immagine);
Riga rigaCorrente = (Riga) listaElementi.get(position);
nome.setText(rigaCorrente.getNome());
immagine.setImageDrawable(mActivity.getResources().getDrawable(rigaCorrente.getImmagine()));
return vi;
}
}
This is my onPostExecute method:
private class LongOperation extends AsyncTask<String, String, JSONObject> {
//Other methods here
protected void onPostExecute(JSONObject result) {
JSONObject jobj = null;
JSONArray elenco_cartelle = null;
try {
jobj = new JSONObject(String.valueOf(result));
} catch (JSONException e) {
e.printStackTrace();
}
//Provo a recuperare i campi json
try {
elenco_cartelle = jobj.getJSONArray("elenco");
} catch (JSONException e) {
e.printStackTrace();
}
ArrayList<Riga> arrayCartelle = new ArrayList<Riga>();
//DEvo scorrere le'elenco delle cartelle
for (int i = 0; i < elenco_cartelle.length(); i++) {
try {
String nome = elenco_cartelle.getString(i);
arrayCartelle.add( new Riga( nome , R.drawable.ic_launcher ) );
} catch (JSONException e) {
e.printStackTrace();
}
}
MyAdapter myAdapter = new MyAdapter(CartelleActivity.class,arrayCartelle);
mainListView.setAdapter(myAdapter);
// Close progress dialog
Dialog.dismiss();
}
}
And this is my Riga class
public class Riga {
String nome;
Integer idImmagine;
public Riga( String nome, Integer idImmagine ) {
super();
this.nome = nome;
this.idImmagine = idImmagine;
}
public String getNome() {
return this.nome;
}
public Integer getImmagine() {
return this.idImmagine;
}
public void setNome( String nome ) {
this.nome = nome;
}
public void setIdImmagine( Integer idImmagine ) {
this.idImmagine = idImmagine;
}
}
The problem is on this line:
MyAdapter myAdapter = new MyAdapter(CartelleActivity.class,arrayCartelle);
The IDE ( AndroidStudio ) says that I can't use CartelleActivity.
How can I use my Adapter?

SOLVED.
Used:
CartelleActivity.this
instead
CartelleActivity.class

Theres something fishy in your code. Try to define your ArrayList in your adapter by changing it to ArrayList<Riga> :
private Activity mActivity;
private ArrayList<Riga> listaElementi;
private static LayoutInflater infilater = null;
public MyAdapter( Activity a, ArrayList<Riga> list) {
mActivity = a;
listaElementi = list;
infilater = (LayoutInflater) mActivity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}

public class LongOperation extends AsyncTask<String, String, JSONObject> {
private Activity a;
public CustomAsync(Activity a) {
this.a = a;
}
#Override
protected JSONObject doInBackground(String... params) {
// TODO Auto-generated method stub
return null;
}
#Override
protected void onPostExecute(JSONObject result) {
super.onPostExecute(result);
MyAdapter myAdapter = new MyAdapter(a, new ArrayList());
}
}

Related

Json volley listview error incompatible types Adapter

I have been following some tutorials to retrieve json data and add it to a listview using volley. I have been stuck in this error trying to solve it for some time, so i had to seek out some help. I tried many examples, this one seems the most intuitive to learn, but i just cant get passed this error, thank you
i cant solve this error
this is my model class
public class Trilhos {
private int id;
private String titulo;
private int id_user;
private String dificuldade;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getTitulo() {
return titulo;
}
public void setTitulo(String titulo) {
this.titulo = titulo;
}
public int getId_user() {
return id_user;
}
public void setId_user(int id_user) {
this.id_user = id_user;
}
public String getDificuldade() {
return dificuldade;
}
public void setDificuldade(String dificuldade) {
this.dificuldade = dificuldade;
}
}
my adapter
public class AdapterTrilhos extends BaseAdapter {
private Activity activity;
private LayoutInflater inflater;
private List<Trilhos> triList;
public AdapterTrilhos(List<Trilhos> triList, Activity activity) {
this.activity = activity;
this.triList = triList;
}
#Override
public int getCount() {
return this.triList.size();
}
#Override
public Object getItem(int position) {
return this.triList.get(position);
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
if (inflater == null)
inflater = (LayoutInflater) activity
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if (convertView == null)
convertView = inflater.inflate(R.layout.dadoslista, null);
TextView idtxt = (TextView)
convertView.findViewById(R.id.txtid);
TextView tittxt = (TextView)
convertView.findViewById(R.id.txttit);
TextView usertxt = convertView.findViewById(R.id.txtuser);
TextView diftxt = (TextView)
convertView.findViewById(R.id.txtdif);
Trilhos t = triList.get(position);
idtxt.setText(t.getId());
tittxt.setText(t.getTitulo());
usertxt.setText(t.getId_user());
diftxt.setText(t.getDificuldade());
return convertView;
}
}
my main_activity (listarTrilhos)
public class ListarTrilhos extends Activity {
private static final String
urlget="http://192.168.1.68/loginsignup/getTrilhos.php";
private ListView listView;
private AdapterTrilhos adapter;
private List<Trilhos> TrilhosList = new ArrayList<Trilhos>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.listatrilhos);
listView=findViewById(R.id.listv);
adapter=new AdapterTrilhos(this,TrilhosList);
listView.setAdapter(adapter);
criarLista();
}
public void criarLista(){
RequestQueue mRequestQueue =
Volley.newRequestQueue(getApplicationContext());
JsonArrayRequest request = new JsonArrayRequest(
urlget,
new Response.Listener<JSONArray>(){
#Override
public void onResponse(JSONArray response) {
int count = response.length();
for(int i = 0; i < count; i++){
try {
JSONObject jo = response.getJSONObject(i);
Trilhos tri=new Trilhos();
tri.setId(jo.getInt("id"));
tri.setTitulo(jo.getString("titulo"));
tri.setId_user(jo.getInt("id_user"));
tri.setDificuldade(jo.getString("dificuldade"));
TrilhosList.add(tri);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
Toast.makeText(getApplicationContext(), response.toString(),
Toast.LENGTH_LONG).show();
adapter.notifyDataSetChanged();
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(getApplicationContext(), "onErrorResponse",
Toast.LENGTH_LONG).show();
}
}
);
Object TAG_REQUEST_QUEUE = new Object();
request.setTag(TAG_REQUEST_QUEUE);
mRequestQueue.add(request);
mRequestQueue.start();
}
}

I didn't read all of your code but noticed that you have constructor
public AdapterTrilhos(List<Trilhos> triList, Activity activity) {
this.activity = activity;
this.triList = triList;}
change adapter=new AdapterTrilhos(this, TrilhosList); to
adapter=new AdapterTrilhos(TrilhosList, this);

First time SharedPreferences use with GridView

This is my Apps Screenshoot :
There is two button in that GridView : +/-.
So what im gonna try is when i press "+" button or "-" button, the quantity is store in SharedPreferences.
But really im confused about this.
This is my code so far :
package com.android.customer_blanjapasar.Utility;
import android.content.Context;
import android.content.SharedPreferences;
import android.preference.PreferenceManager;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import com.android.customer_blanjapasar.R;
import com.squareup.picasso.Picasso;
import java.util.ArrayList;
import java.util.List;
/**
* Created by Leon on 5/3/2016.
*/
public class CustomGridView2 extends BaseAdapter {
private ArrayList<ListItem> listData;
private LayoutInflater layoutInflater;
private Context context;
private String[] imageUrls;
private int count = 0;
int arrayCount[];
SharedPreferences prefs ;
SharedPreference sharedPreference;
public CustomGridView2(Context context, ArrayList<ListItem> listData) {
this.listData = listData;
layoutInflater = LayoutInflater.from(context);
this.context = context;
sharedPreference = new SharedPreference();
}
#Override
public int getCount() {
return listData.size();
}
#Override
public Object getItem(int position) {
return listData.get(position);
}
#Override
public long getItemId(int position) {
return position;
}
public View getView(final int position, View convertView, ViewGroup parent) {
final ViewHolder holder;
if (convertView == null) {
convertView = layoutInflater.inflate(R.layout.afterlogin_product_gridview, null);
holder = new ViewHolder();
holder.headlineView = (TextView) convertView.findViewById(R.id.nama_produk);
holder.teaserView = (TextView) convertView.findViewById(R.id.harga);
holder.imageView = (ImageView) convertView.findViewById(R.id.img_produk);
holder.cmdMinus = (Button) convertView.findViewById(R.id.btn_min);
holder.cmdPlus = (Button) convertView.findViewById(R.id.btn_plus);
holder.qty = (TextView) convertView.findViewById(R.id.lbl_qty);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
ListItem newsItem = listData.get(position);
String satuan = newsItem.getSatuan().toString();
String harga = newsItem.getReporterName().toString();
harga = "Rp. " + harga + " / " + satuan;
holder.headlineView.setText(newsItem.getHeadline().toUpperCase());
holder.teaserView.setText(harga);
String a = newsItem.getUrl();
holder.cmdPlus.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
count = Integer.parseInt( holder.qty.getText().toString());
count++;
holder.qty.setText(""+count);
}
});
holder.cmdMinus.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
count = Integer.parseInt( holder.qty.getText().toString());
if(count == 0) {
holder.qty.setText("0");
}
else {
count--;
holder.qty.setText("" + count);
}
}
});
if (holder.imageView != null) {
//new ImageDownloaderTask(holder.imageView).execute(newsItem.getUrl());
Picasso
.with(context)
.load(a)
.fit()
.into(holder.imageView);
}
return convertView;
}
static class ViewHolder {
TextView headlineView;
TextView teaserView;
ImageView imageView;
TextView satuan,qty;
Button cmdPlus,cmdMinus;
}
}
I already see this tutorial. But im still getting confused. Please guide me step by step.
EDIT
This is ListItem.class :
public class ListItem {
private String headline;
private String reporterName;
private String kode;
private String url;
private String satuan;
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
public String getHeadline() {
return headline;
}
public void setHeadline(String headline) {
this.headline = headline;
}
public String getReporterName() {
return reporterName;
}
public void setReporterName(String reporterName) {
this.reporterName = reporterName;
}
public String getKode() {
return kode;
}
public void setKode(String kode) {
this.kode = kode;
}
public String getSatuan() {
return satuan;
}
public void setSatuan(String satuan) {
this.satuan = satuan;
}
#Override
public String toString() {
return "[ headline=" + headline + ", reporter Name=" + reporterName + " , date=" + kode + "]";
}
}
And this is the code inside MainActivity.class :
public class AfterLogin_Produk extends Activity {
Activity activity;
ImageButton btn_resep,btn_product;
static int jArray;
GridView product_gridview;
static String[] nama_prdct;
static String[] img_prdct;
static String[] harga_prdct;
static String[] satuan_prdct;
static String kode_ktgr;
#TargetApi(Build.VERSION_CODES.LOLLIPOP)
#Override
protected void onCreate(Bundle savedInstanceState) {
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
super.onCreate(savedInstanceState);
setContentView(R.layout.after_login_produk_main);
product_gridview = (GridView) findViewById(R.id.product_gridview);
new GetLength().execute();
}
public ArrayList<ListItem> getListData() {
ArrayList<ListItem> listMockData = new ArrayList<ListItem>();
for (int i = 0; i < jArray; i++) {
ListItem newsData = new ListItem();
newsData.setUrl(img_prdct[i]);
newsData.setHeadline(nama_prdct[i]);
newsData.setReporterName(harga_prdct[i]);
newsData.setSatuan(satuan_prdct[i]);
listMockData.add(newsData);
}
return listMockData;
}
class GetLength extends AsyncTask<String, String, String> {
String nama_product,img_product,harga_product,satuan_product;
JSONParser2 jParser = new JSONParser2();
ArrayList<String> list_nama_produk = new ArrayList<String>();
ArrayList<String> list_img_produk = new ArrayList<String>();
ArrayList<String> list_harga_produk = new ArrayList<String>();
ArrayList<String> list_satuan_produk = new ArrayList<String>();
protected String doInBackground(String... params) {
try {
List<NameValuePair> param = new ArrayList<NameValuePair>();
param.add(new BasicNameValuePair("kode_kategori", kode_ktgr));
JSONObject json = jParser.makeHttpRequest("http:xxx.php", "POST", param);
JSONArray array = json.getJSONArray("categories");
jArray = array.length();
for (int i = 0; i < array.length(); i++) {
JSONObject row = array.getJSONObject(i);
nama_product = row.getString("nama_produk");
img_product = row.getString("img_produk");
harga_product = row.getString("harga_satuan");
satuan_product = row.getString("nama_satuan");
list_nama_produk.add(nama_product);
list_img_produk.add(img_product);
list_harga_produk.add(harga_product);
list_satuan_produk.add(satuan_product);
}
} catch (Exception e) {
System.out.println("Exception : " + e.getMessage());
}
return null;
}
#Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
//Toast.makeText(getBaseContext(),"Value : " + list_nama_kategori,Toast.LENGTH_SHORT).show();
nama_prdct = new String[list_nama_produk.size()];
img_prdct = new String[list_img_produk.size()];
harga_prdct = new String[list_harga_produk.size()];
satuan_prdct = new String[list_satuan_produk.size()];
nama_prdct = list_nama_produk.toArray(nama_prdct);
img_prdct = list_img_produk.toArray(img_prdct);
harga_prdct = list_harga_produk.toArray(harga_prdct);
satuan_prdct = list_satuan_produk.toArray(satuan_prdct);
ArrayList<ListItem> listData = getListData();
product_gridview.setAdapter(new CustomGridView2(AfterLogin_Produk.this, listData));
}
}

you are using custom array list of object than set propertie to it and on back press of application you can jsonify your object to string and store it in shared preference and at activity on create you can regenerate your object getting from shared preference. in activity onCreate()
SharedPreferences mSettings = PreferenceManager.getDefaultSharedPreferences
(Dashboard.this);
String data = mSettings.getString("data", "");
/* Should Activity Check for Updates Now? */
if ((data.equals(""))) {
//do nothing data is not in shared preference
}
else {
//data is there convert To object
data=mSettings.getString("data", "");
Type listType = new TypeToken<ArrayList<ListRowItem>>() {
}.getType();
ArrayList<ListRowItem> listRowItems = new Gson().fromJson(data, listType);
//setAdapter coming for arrayList as usual.
}
and in backPressed you can read data from adapter and jsonify it using json and put it in sharedPreference
i hope you understand the login . clear preference after data set.

Your issue is here:
holder.qty.setText(store);
It is clearly pointed out in your error log:
android.content.res.Resources$NotFoundException: String resource ID
0x1 at android.content.res.Resources.getText(Resources.java:1409) at android.widget.TextView.setText(TextView.java:4943)
store is an integer and setText is trying to look for a resource with this id. Use this instead.
holder.qty.setText(store.toString());
Also, to reduce the complexity of shared preferences specific code you can use this library

How to implement endless scrolling listview

I am creating an application in which I am parsing data using Json parsing. I've implemented listview and in my response i have totalpage and current page objects,
A new user will get items from the first page. While the user is scrolling through the listview, the list expands with items from the next page (and the next and the next etc.)
this is my response
http://pastie.org/10259792
The following is code I've tried:
HomeFragment
public class HomeFragment extends Fragment {
// Listview Adapter
ListViewAdapter adapters;
// Connection detector
ConnectionDetector cd;
// Alert dialog manager
AlertDialogManager alert = new AlertDialogManager();
// Progress Dialog
private ProgressDialog pDialog;
// Creating JSON Parser object
JSONparserr jsonParser = new JSONparserr();
ArrayList<HashMap<String, String>> WebsiteList;
// albums JSONArray
JSONArray data = null;
String link_url;
ArrayList<HashMap<String, String>> arrayTemplist;
private AutoCompleteTextView inputSearch;
private ListView lv;
private static final String URL_ALBUMS = "";
private static final String WEBSITE_MENU_ID ="Brand_name";
private static final String TAG_MATCH="data";
//private static final String TAG_NAME="Brand_name";
private static final String TAG_PROFILE="id";
private static final String TAG_CAST="Company";
public HomeFragment(){}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_home, container, false);
lv = (ListView)rootView.findViewById(R.id.listpehlu);
cd = new ConnectionDetector(getActivity());
WebsiteList = new ArrayList<HashMap<String, String>>();
// Loading Albums JSON in Background Thread
new LoadAlbums().execute();
// get listview
inputSearch = (AutoCompleteTextView)rootView.findViewById(R.id.autoCompleteTextViewhomefrag);
inputSearch.addTextChangedListener(new TextWatcher() {
#Override
public void onTextChanged(CharSequence cs, int arg1, int arg2, int arg3) {
arrayTemplist= new ArrayList<HashMap<String,String>>();
String searchString =inputSearch.getText().toString().toLowerCase();
for (int i = 0; i < WebsiteList.size(); i++)
{
String currentString =WebsiteList.get(i).get(HomeFragment.this.WEBSITE_MENU_ID);
if (currentString.toLowerCase().startsWith(searchString ))
{
arrayTemplist.add(WebsiteList.get(i));
}
}
for (int i = 0; i < arrayTemplist.size(); i++)
{
String currentstrin = arrayTemplist.get(i).get(HomeFragment.this.WEBSITE_MENU_ID);
//Toast.makeText(getApplicationContext(), currentstrin, Toast.LENGTH_LONG).show();
}
SimpleAdapter adapters = new SimpleAdapter(getActivity(), arrayTemplist,R.layout.list_item_match, new String[] {WEBSITE_MENU_ID,TAG_CAST
}, new int[] {
R.id.txtbrndnm,R.id.txtbrndcomp});
lv.setAdapter(adapters);
}
#Override
public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,
int arg3) {
// TODO Auto-generated method stub
}
#Override
public void afterTextChanged(Editable arg0) {
// TODO Auto-generated method stub
}
});
lv.setOnItemClickListener(new android.widget.AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> arg0, View view, int position,
long arg3) {
Selected_Product_Listing tf = new Selected_Product_Listing();
Bundle bundle = new Bundle();
bundle.putString("prducts_name", WebsiteList.get(position).get((WEBSITE_MENU_ID)));
// bundle.putString("prducts_name", aList.get(position).get(INTEREST_ACCEPT_NAME));
tf.setArguments(bundle);
FragmentManager fm = getFragmentManager();
FragmentTransaction ft = fm.beginTransaction();
ft.replace(R.id.frame_container, tf);
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
ft.addToBackStack(null);
ft.commit();
// Toast.makeText(getActivity(),"lets"+ WebsiteList.get(position).get(convertToBase64(convertToBase64(WEBSITE_MENU_ID))), Toast.LENGTH_LONG).show();
}
});
lv.setOnScrollListener(new OnScrollListener() {
public void onScrollStateChanged(AbsListView view, int scrollState) {
}
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
if(firstVisibleItem+visibleItemCount == totalItemCount && totalItemCount!=0)
{
}
}
});
return rootView;
}
public String convertToBase64(String text) {
byte[] data = null;
try {
data = text.getBytes("UTF-8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
return Base64.encodeToString(data, Base64.DEFAULT);
}
class LoadAlbums extends AsyncTask<String, String, String> {
private JSONObject jsonObj;
/**
* Before starting background thread Show Progress Dialog
* */
#Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(getActivity());
pDialog.setMessage("Loading...");
pDialog.setIndeterminate(true);
pDialog.setIndeterminateDrawable(getResources().getDrawable(R.drawable.custom_progress));
pDialog.setCancelable(false);
pDialog.show();
}
protected String doInBackground(String... args) {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
// getting JSON string from URL
String json = jsonParser.makeHttpRequest(URL_ALBUMS, "GET",
params);
// Check your log cat for JSON reponse
Log.d("Albums JSON: ", "> " + json);
if (json != null) {
try {
jsonObj = new JSONObject(json);
// Getting JSON Array node
data = jsonObj.getJSONArray(TAG_MATCH);
String totpage=jsonObj.getString("total_page");
System.out.println("Total Page"+totpage);
String curpage=jsonObj.getString("current_page");
System.out.println("Total Page"+curpage);
// looping through All Contacts
for (int i = 0; i < data.length(); i++) {
JSONObject c = data.getJSONObject(i);
HashMap<String, String> map = new HashMap<String, String>();
map.put(WEBSITE_MENU_ID,c.getString(WEBSITE_MENU_ID));
map.put(TAG_PROFILE, c.getString(TAG_PROFILE));
map.put(TAG_CAST, c.getString(TAG_CAST));
WebsiteList.add(map);
}
} catch (JSONException e) {
e.printStackTrace();
}
} else {
Log.e("ServiceHandler", "Couldn't get any data from the url");
}
return null;
}
protected void onPostExecute(String file_url) {
// dismiss the dialog after getting all albums
pDialog.dismiss();
// updating UI from Background Thread
ListAdapter adapter = new SimpleAdapter(
getActivity(), WebsiteList,
R.layout.list_item_match, new String[] {WEBSITE_MENU_ID,TAG_CAST
}, new int[] {
R.id.txtbrndnm,R.id.txtbrndcomp});
lv.setAdapter(adapter);
}
}
EndlessAdapter
public class EndLessAdapter extends ArrayAdapter<String> {
private Context context;
private List<String> items;
private int layoutId;
public EndLessAdapter(Context context, List<String> items, int LayoutId) {
super(context,LayoutId,items);
this.context = context;
this.items = items;
this.layoutId = LayoutId;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
if(convertView == null)
convertView = ((LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE)).inflate(layoutId,parent,false);
TextView tView = (TextView)convertView.findViewById(R.id.txt);
tView.setText(items.get(position));
return convertView;
}
}
EndlessLisView
public class EndlessListView extends ListView implements OnScrollListener {
private Context context;
private View footer;
private boolean isLoading;
private EndLessListener listener;
private BaseAdapter adapter;
public EndlessListView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
this.setOnScrollListener(this);
this.context = context;
}
public EndlessListView(Context context, AttributeSet attrs) {
super(context, attrs);
this.setOnScrollListener(this);
this.context = context;
}
public EndlessListView(Context context) {
super(context);
this.setOnScrollListener(this);
this.context = context;
}
#Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
}
// 4
public void addNewData() {
this.removeFooterView(footer);
// adapter.addAll(products);
adapter.notifyDataSetChanged();
isLoading = false;
}
public void setLoading()
{
isLoading = false;
}
#Override
public void onScroll(AbsListView view, int firstVisibleItem,int visibleItemCount, int totalItemCount) {
if(getAdapter() == null)
return;
if(getAdapter().getCount() == 0)
return;
int l = visibleItemCount + firstVisibleItem;
System.out.println("List View Total Item Count = "+totalItemCount+" , l = "+l+", is_loading = "+isLoading);
if(l >= totalItemCount && !isLoading){
// add footer layout
this.addFooterView(footer);
// set progress boolean
isLoading = true;
System.out.println("$$$$$$$$$ call loaddata $$$$$$$$$$$");
// call interface method to load new data
listener.loadData();
}
}
// Calling order from MainActivity
// 1
public void setLoadingView(int resId) {
footer = ((LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE)).inflate(resId, null); // footer = (View)inflater.inflate(resId, null);
this.addFooterView(footer);
System.out.println("addfooter ====######");
}
// 2
public void setListener(EndLessListener listener) {
this.listener = listener;
}
// 3
public void setAdapter(BaseAdapter adapter) {
super.setAdapter(adapter);
this.adapter = adapter;
this.removeFooterView(footer);
}
public void removeFooter(){
this.removeFooterView(footer);
}
}

You can achieve this by using the following library in Github
https://github.com/nicolasjafelle/PagingListView
Simple create your PagingAdapter and add it to com.paging.listview.PagingListView.
You have to implements the new Pagingable interface and its onLoadMoreItems() method. For example:
listView.setHasMoreItems(true);
listView.setPagingableListener(new PagingListView.Pagingable() {
#Override
public void onLoadMoreItems() {
if (pager < 3) {
new CountryAsyncTask(false).execute();
} else {
listView.onFinishLoading(false, null);
}
}
});
Finally you can use the onFinishLoading(boolean hasMoreItems, List newItems) method to update the list.
listView.onFinishLoading(true, newItems);
Also remember to use this package in your layout files:
<com.paging.listview.PagingListView
android:id="#+id/paging_list_view"
android:layout_width="match_parent"
android:layout_height="match_parent"/>

Hello here you can find the nostra library for lazy loading and then you can
implement the following example for lazzy loading
https://github.com/nostra13/Android-Universal-Image-Loader
you can achieve Lazy loading by using the below
code
Lets start the coding about the lazy loading.
MainActivity.java
package com.sunil.lazyloading;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class MainActivity extends Activity implements OnClickListener{
private Button btnlist=null;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnlist= (Button)findViewById(R.id.button_listview);
btnlist.setOnClickListener(this);
}
#Override
public void onClick(View arg0) {
Intent intent = new Intent(this, ImageListActivity.class);
intent.putExtra("stringarrayimage", Constants.IMAGES);
startActivity(intent);
}
}
CustomAdapter.java
package com.sunil.adapter;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.assist.ImageLoadingListener;
import com.nostra13.universalimageloader.core.assist.SimpleImageLoadingListener;
import com.nostra13.universalimageloader.core.display.FadeInBitmapDisplayer;
import com.nostra13.universalimageloader.core.display.RoundedBitmapDisplayer;
import com.sunil.lazyloading.R;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
public class CustomAdapter extends BaseAdapter{
private String imageurl[]=null;
private Context context=null;
DisplayImageOptions doption=null;
private ImageLoadingListener animateFirstListener =null;
public CustomAdapter(Activity activity, String[] imageurl)
{
this.context=activity;
this.imageurl=imageurl;
doption=new DisplayImageOptions.Builder().showImageForEmptyUri(R.drawable.ic_empty).showImageOnFail(R.drawable.ic_error).showStubImage(R.drawable.ic_stub).cacheInMemory(true).cacheOnDisc(true).displayer(new RoundedBitmapDisplayer(20)).build();
animateFirstListener = new AnimateFirstDisplayListener();
}
#Override
public int getCount() {
return imageurl.length;
}
#Override
public Object getItem(int arg0) {
return arg0;
}
#Override
public long getItemId(int arg0) {
return arg0;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View view = convertView;
final ViewHolder holder;
if (convertView == null) {
view = ((Activity) context).getLayoutInflater().inflate(R.layout.item_list_row, parent, false);
holder = new ViewHolder();
holder.text = (TextView) view.findViewById(R.id.text);
holder.image = (ImageView) view.findViewById(R.id.image);
view.setTag(holder);
} else {
holder = (ViewHolder) view.getTag();
}
holder.text.setText("Item " + (position + 1));
ImageLoader imageLoader = ImageLoader.getInstance();
imageLoader.displayImage(imageurl[position], holder.image, doption, animateFirstListener);
return view;
}
private static class AnimateFirstDisplayListener extends SimpleImageLoadingListener {
static final List<string> displayedImages = Collections.synchronizedList(new LinkedList<string>());
#Override
public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) {
if (loadedImage != null) {
ImageView imageView = (ImageView) view;
boolean firstDisplay = !displayedImages.contains(imageUri);
if (firstDisplay) {
FadeInBitmapDisplayer.animate(imageView, 500);
displayedImages.add(imageUri);
}
}
}
}
private class ViewHolder {
public TextView text;
public ImageView image;
}
}
</string></string>
ImageListActivity.java
package com.sunil.lazyloading;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ImageView;
import android.widget.ListView;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.assist.SimpleImageLoadingListener;
MainActivity.java
package com.sunil.lazyloading;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class MainActivity extends Activity implements OnClickListener{
private Button btnlist=null;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnlist= (Button)findViewById(R.id.button_listview);
btnlist.setOnClickListener(this);
}
#Override
public void onClick(View arg0) {
Intent intent = new Intent(this, ImageListActivity.class);
intent.putExtra("stringarrayimage", Constants.IMAGES);
startActivity(intent);
}
}
CustomAdapter.java
package com.sunil.adapter;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.assist.ImageLoadingListener;
import com.nostra13.universalimageloader.core.assist.SimpleImageLoadingListener;
import com.nostra13.universalimageloader.core.display.FadeInBitmapDisplayer;
import com.nostra13.universalimageloader.core.display.RoundedBitmapDisplayer;
import com.sunil.lazyloading.R;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
public class CustomAdapter extends BaseAdapter{
private String imageurl[]=null;
private Context context=null;
DisplayImageOptions doption=null;
private ImageLoadingListener animateFirstListener =null;
public CustomAdapter(Activity activity, String[] imageurl)
{
this.context=activity;
this.imageurl=imageurl;
doption=new DisplayImageOptions.Builder().showImageForEmptyUri(R.drawable.ic_empty).showImageOnFail(R.drawable.ic_error).showStubImage(R.drawable.ic_stub).cacheInMemory(true).cacheOnDisc(true).displayer(new RoundedBitmapDisplayer(20)).build();
animateFirstListener = new AnimateFirstDisplayListener();
}
#Override
public int getCount() {
return imageurl.length;
}
#Override
public Object getItem(int arg0) {
return arg0;
}
#Override
public long getItemId(int arg0) {
return arg0;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View view = convertView;
final ViewHolder holder;
if (convertView == null) {
view = ((Activity) context).getLayoutInflater().inflate(R.layout.item_list_row, parent, false);
holder = new ViewHolder();
holder.text = (TextView) view.findViewById(R.id.text);
holder.image = (ImageView) view.findViewById(R.id.image);
view.setTag(holder);
} else {
holder = (ViewHolder) view.getTag();
}
holder.text.setText("Item " + (position + 1));
ImageLoader imageLoader = ImageLoader.getInstance();
imageLoader.displayImage(imageurl[position], holder.image, doption, animateFirstListener);
return view;
}
private static class AnimateFirstDisplayListener extends SimpleImageLoadingListener {
static final List<string> displayedImages = Collections.synchronizedList(new LinkedList<string>());
#Override
public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) {
if (loadedImage != null) {
ImageView imageView = (ImageView) view;
boolean firstDisplay = !displayedImages.contains(imageUri);
if (firstDisplay) {
FadeInBitmapDisplayer.animate(imageView, 500);
displayedImages.add(imageUri);
}
}
}
}
private class ViewHolder {
public TextView text;
public ImageView image;
}
}
</string></string>
ImageListActivity.java
package com.sunil.lazyloading;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ImageView;
import android.widget.ListView;
import com.nostra13.universalimageloader.core.display.FadeInBitmapDisplayer;
import com.sunil.adapter.CustomAdapter;
public class ImageListActivity extends Activity implements OnItemClickListener{
private ListView listview=null;
private String[] imageUrls;
protected ImageLoader imageLoader=null;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.imagelist);
listview=(ListView)findViewById(R.id.listView_image);
imageLoader = ImageLoader.getInstance();
Bundle bundle = getIntent().getExtras();
imageUrls = bundle.getStringArray("stringarrayimage");
CustomAdapter adapter=new CustomAdapter(ImageListActivity.this, imageUrls);
listview.setAdapter(adapter);
listview.setOnItemClickListener(this);
}
#Override
public void onItemClick(AdapterView arg0, View arg1, int position, long arg3) {
Intent intent = new Intent(this, ImagePagerActivity.class);
intent.putExtra("imageurlpostion", imageUrls);
intent.putExtra("imagepostion", position);
startActivity(intent);
}
#Override
public void onBackPressed() {
AnimateFirstDisplayListener.displayedImages.clear();
super.onBackPressed();
}
private static class AnimateFirstDisplayListener extends SimpleImageLoadingListener {
static final List<string> displayedImages = Collections.synchronizedList(new LinkedList<string>());
#Override
public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) {
if (loadedImage != null) {
ImageView imageView = (ImageView) view;
boolean firstDisplay = !displayedImages.contains(imageUri);
if (firstDisplay) {
FadeInBitmapDisplayer.animate(imageView, 500);
displayedImages.add(imageUri);
}
}
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.item_clear_memory_cache:
imageLoader.clearMemoryCache();
return true;
case R.id.item_clear_disc_cache:
imageLoader.clearDiscCache();
return true;
default:
return false;
}
}
}
activity_main.xml
<button android:id="#+id/button_listview" android:layout_height="wrap_content" android:layout_width="wrap_content" android:text="ListView ImageLoad">
imagelist.xml
<listview android:id="#+id/listView_image" android:layout_height="match_parent" android:layout_width="match_parent">
</listview>
item_list_row.xml
<imageview android:adjustviewbounds="true" android:contentdescription="#string/descr_image" android:id="#+id/image" android:layout_height="72dip" android:layout_margin="3dip" android:layout_width="72dip" android:scaletype="centerCrop">
<textview android:id="#+id/text" android:layout_gravity="left|center_vertical" android:layout_height="wrap_content" android:layout_marginleft="20dip" android:layout_width="fill_parent" android:textsize="22sp">
For the Example above you need to download the library universal image loader you can download the library ... happy coding :)

you didn't use EndlessListView in your Fragment. As I looked your response, it includes pagination. So, you need to request with page number to use endless scroll.
This is just flow for Endless Listview. If your code still doesn't work, I hope you can learn sample projects after read this messages. I added only parts you need. Thanks
Endless scroll only shows limited data on listview. When user scroll down to bottom, it will get next limited data from server. So you need to add current_page paramater in your request. I don't know exactly your api.
First, you need variable for current_page which initialize with 0
You have to know when to stop. You response has total_page field for that. Save and add validation
Then you need to know when to request next page. For that,you already have codes in onScroll within EndlessListView. That code calculate and tell when user scroll down to bottom and it called
listener.loadData();
to request new data. But you still need to add listener for that. You already have
public void setListener(EndLessListener listener) {
this.listener = listener;
}
You need to create Interface with the name EndlessListener and implements in your fragment. EndlessListener Interface will include loadData() function that request to server. After that you need to add listener for the listview.
endlessListView.setListener(this);

Try Loading data when listview reaches it's end. Implement OnScrollListener in your fragment. Refer this link Android - ListView to load more items when reached end

You MUST use Paging 3 library to resolve all problems in simplest way.

ListView XMl:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ListView
android:id="#+id/orderlistview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_gravity="center"
/>
</LinearLayout>
OrderList class
public class OrderList {
int _orderId;
int _orderincrement_id;
String _orderstatus;
String _orderdate;
String _ordership_to;
String _ordertotal;
String _ordercurrency_symbol;
// Empty constructor
public OrderList() {
}
// constructor
public OrderList(int _orderId, int _orderincrement_id, String _orderstatus,
String _orderdate, String _ordership_to, String _ordertotal,
String _ordercurrency_symbol) {
this._orderId = _orderId;
this._orderincrement_id = _orderincrement_id;
this._orderstatus = _orderstatus;
this._orderdate = _orderdate;
this._ordership_to = _ordership_to;
this._ordertotal = _ordertotal;
this._ordercurrency_symbol = _ordercurrency_symbol;
}
public int get_orderId() {
return _orderId;
}
public void set_orderId(int _orderId) {
this._orderId = _orderId;
}
public int get_orderincrement_id() {
return _orderincrement_id;
}
public void set_orderincrement_id(int _orderincrement_id) {
this._orderincrement_id = _orderincrement_id;
}
public String get_orderstatus() {
return _orderstatus;
}
public void set_orderstatus(String _orderstatus) {
this._orderstatus = _orderstatus;
}
public String get_orderdate() {
return _orderdate;
}
public void set_orderdate(String _orderdate) {
this._orderdate = _orderdate;
}
public String get_ordership_to() {
return _ordership_to;
}
public void set_ordership_to(String _ordership_to) {
this._ordership_to = _ordership_to;
}
public String get_ordertotal() {
return _ordertotal;
}
public void set_ordertotal(String _ordertotal) {
this._ordertotal = _ordertotal;
}
public String get_ordercurrency_symbol() {
return _ordercurrency_symbol;
}
public void set_ordercurrency_symbol(String _ordercurrency_symbol) {
this._ordercurrency_symbol = _ordercurrency_symbol;
}
}
Activity
public class OrderListFragment extends Fragment {
View rootView;
ListView lv;
List<OrderList> list ;
MyListAdapter adt;
DatabaseHandler db ;
ProgressDialog progress;
SharedPreferences pref;
public OrderListFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
rootView = inflater.inflate(R.layout.fragmentorderlist, container,
false);
if (android.os.Build.VERSION.SDK_INT > 9) {
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder()
.permitAll().build();
StrictMode.setThreadPolicy(policy);
}
lv = (ListView) rootView.findViewById(R.id.orderlistview);
db = new DatabaseHandler(getActivity());
list = db.getAllOrderList();
if(list.size() == 0){
progress = new ProgressDialog(getActivity());
progress.setMessage("Fetching Data.....");
progress.setIndeterminate(true);
progress.setCancelable(false);
progress.show();
pref = PreferenceManager.getDefaultSharedPreferences(getActivity());
String customer_id = pref.getString("customer_id", null);
Log.v("log_tag", "customer_id"+customer_id);
if(customer_id != null){
Log.v("log_tag", "customer_id 2332 ::: "+customer_id);
new FetchOrderListData().execute(customer_id);
}
}
adt = new MyListAdapter(getActivity());
lv.setAdapter(adt);
lv.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> a, View v, int position,
long id) {
Bundle bundle = new Bundle();
bundle.putString("orderlist_increment_id", list.get(position).get_orderincrement_id()+"");
Fragment fragment = new OrderdetailFragment();
fragment.setArguments(bundle);
FragmentManager fragmentManager = OrderListFragment.this
.getActivity().getSupportFragmentManager();
FragmentTransaction mFragmentTransaction = fragmentManager
.beginTransaction();
mFragmentTransaction.addToBackStack(null);
mFragmentTransaction.replace(R.id.Frame_Layout, fragment)
.commit();
}
});
return rootView;
}
public class MyListAdapter extends BaseAdapter {
private LayoutInflater mInflater;
public MyListAdapter(Context context) {
mInflater = LayoutInflater.from(context);
}
public int getCount() {
return list.size();
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(final int position, View convertView,
ViewGroup parent) {
convertView = mInflater.inflate(R.layout.custom_orderlistdata,
null);
TextView ordernumbertxt = (TextView) convertView
.findViewById(R.id.ordernumberTxt);
TextView orderdate = (TextView) convertView
.findViewById(R.id.orderdateTxt);
TextView orderamount = (TextView) convertView
.findViewById(R.id.orderAmountTxt);
TextView orderSatusTxt = (TextView) convertView
.findViewById(R.id.orderSatusTxt);
ordernumbertxt.setText(Html.fromHtml("<b>Order Number : </b>"+list.get(position).get_orderincrement_id()+""));
orderdate.setText(list.get(position).get_orderdate());
orderSatusTxt.setText(list.get(position).get_orderstatus());
String parts = list.get(position).get_ordertotal();
double d = Double.parseDouble(parts);
double dval = roundTwoDecimals(d);
orderamount.setText(Html.fromHtml("<b>Total : </b>"+list.get(position).get_ordercurrency_symbol()+" "+dval));
return convertView;
}
public double roundTwoDecimals(double d) {
DecimalFormat twoDForm = new DecimalFormat("#.##");
return Double.valueOf(twoDForm.format(d));
}
}
private class FetchOrderListData extends AsyncTask<String, Void, JSONObject> {
#Override
protected void onPreExecute() {
}
#Override
protected JSONObject doInBackground(String... args) {
JSONObject listSize = null;
Integer cust_id = Integer.parseInt(args[0]);
try {
listSize = DBAda.getAllOrderListData(cust_id);
////*** call your HTTP Service over here ***////
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return listSize;
}
protected void onPostExecute(JSONObject jsonObj) {
db = new DatabaseHandler(getActivity());
if (progress != null) {
progress.hide();
}
if (jsonObj == null) {
return;
}
JSONArray json;
try {
json = jsonObj.getJSONArray("records");
for (int i = 0; i < json.length(); i++) {
JSONObject jobj;
try {
jobj = json.getJSONObject(i);
int order_id = Integer.parseInt(jobj.getString("order_id").toString());
int order_IncrementId = Integer.parseInt(jobj.getString("increment_id").toString());
String orderStatus = jobj.getString("status");
String orderdate = jobj.getString("date");
String ordershipto = jobj.getString("ship_to");
String ordertotal = jobj.getString("order_total");
String ordersymbol = jobj.getString("currency_symbol");
//db.addWishlistItem(new WishList(entity_id,quentity,comment,name,short_description,thumbnails,itemId));
db.addOrderListItem(new OrderList(order_id, order_IncrementId, orderStatus, orderdate, ordershipto, ordertotal, ordersymbol));
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
} catch (JSONException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
lv = (ListView) rootView.findViewById(R.id.orderlistview);
db = new DatabaseHandler(getActivity());
list = db.getAllOrderList();
adt = new MyListAdapter(getActivity());
lv.setAdapter(adt);
}
}
}

Universal Image Loader using JSON instead of the Constants Class

I've got a functioning Universal Image Loader that I'm trying to switch to grabbing the image URLs from JSON rather than the Constants Class that it normally uses. I've created a JSON Parsing Class that outputs an ArrayList called galleryArrList. But I can't figure out how to implement my JSON Parsing class and also how to modify the Adapter class in the UILGrid class to accept the galleryArrList String. Here are the Classes:
UILGrid Class:
import android.content.Intent;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.mysite.wcbc.UKVPConstants.Extra;
public class UILGrid extends AbsListViewBaseActivity {
String[] imageUrls;
DisplayImageOptions options;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.uil_grid);
Bundle bundle = getIntent().getExtras();
imageUrls = bundle.getStringArray(Extra.IMAGES);
options = new DisplayImageOptions.Builder()
.showImageOnLoading(R.drawable.ic_stub)
.showImageForEmptyUri(R.drawable.ic_empty)
.showImageOnFail(R.drawable.ic_error).cacheInMemory(true)
.cacheOnDisc(true).bitmapConfig(Bitmap.Config.RGB_565).build();
listView = (GridView) findViewById(R.id.uil_gridview);
((GridView) listView).setAdapter(new ImageAdapter());
listView.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
startImagePagerActivity(position);
}
});
}
private void startImagePagerActivity(int position) {
Intent intent = new Intent(this, CVP2.class); // ---- Change here
intent.putExtra(Extra.IMAGES, imageUrls);
intent.putExtra(Extra.IMAGE_POSITION, position);
startActivity(intent);
}
public class ImageAdapter extends BaseAdapter {
#Override
public int getCount() {
return imageUrls.length;
}
#Override
public Object getItem(int position) {
return null;
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
final ImageView imageView;
if (convertView == null) {
imageView = (ImageView) getLayoutInflater().inflate(
R.layout.uil_grid_item, parent, false);
} else {
imageView = (ImageView) convertView;
}
imageLoader.displayImage(imageUrls[position], imageView, options);
return imageView;
}
}
}
my UILJSONParse Class:
import java.util.ArrayList;
import java.util.HashMap;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.os.AsyncTask;
public class UILJSONParse extends AsyncTask<String, String, JSONObject> {
// url to make request
private static String url = "http://www.mysite.com/apps/wcbc/galleryuil.txt";
// Hashmap for ListView
// ArrayList<HashMap<String, String>> arraylist;
ArrayList<HashMap<String, String>> galleryArrList = new ArrayList<HashMap<String, String>>();
// JSON Node names
private static final String TAG_GALLERY = "gallery";
private static final String TAG_GALLERYURL = "galleryurl";
private static final String TAG_ID = "id";
private static final String TAG_GALLERYDESCR = "gallerydescr";
// gallery JSONArray
JSONArray JSArrGallery = null;
#Override
protected JSONObject doInBackground(String... arg0) {
// Creating JSON Parser instance
JGrid4Adapter jParser = new JGrid4Adapter();
// getting JSON string from URL
JSONObject jsonOb = jParser.getJSONFromUrl(url);
return jsonOb;
}
#Override
protected void onPostExecute(JSONObject jsonOb) {
try {
JSArrGallery = jsonOb.getJSONArray(TAG_GALLERY);
// looping through All gallery images
for (int i = 0; i < JSArrGallery.length(); i++) {
JSONObject galleryJO = JSArrGallery.getJSONObject(i);
String idStr = galleryJO.getString(TAG_ID);
String urlStr = galleryJO.getString(TAG_GALLERYURL);
String descrStr = galleryJO.getString(TAG_GALLERYDESCR);
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
map.put(TAG_ID, idStr);
map.put(TAG_GALLERYURL, urlStr);
map.put(TAG_GALLERYDESCR, descrStr);
// adding HashMap map to ArrayList galleryArrList, defined
// above
galleryArrList.add(map);
}// -- END for loop
} catch (JSONException e) {
e.printStackTrace();
}// --- END Try
}// --- END onPostExecute
}// --- END UILJSONParse Class

I've figured this out since asking the question. I have a Button Interface Activity where an AsyncTask is called that grabs the JSON data when a button is clicked. The AysncTask then bundles the data and sends it to my Gallery Grid Class. The AsyncTask is calling the above JSON Parsing Class. So here's the code:
// --- artwork button
cartoon_BTN.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View arg0) {
jsonFileStr = "artwork_json";
new ArtworkJSON().execute();
}
});
// --- end artwork button
private class ArtworkJSON extends AsyncTask<Void, Void, Void> {
JSONObject jsonobject;
String TAG_ID = "id";
String TAG_DESCR = "artworkdescr";
String TAG_MEDIUM = "artworkmedium";
String TAG_PRICE = "artworkprice";
String TAG_URL = "artworkurl";
ArrayList<HashMap<String, String>> hashArraylist;
ArrayList<String> urlArrayList;
ArrayList<String> idArrayList;
ArrayList<String> descrArrayList;
ArrayList<String> mediumArrayList;
ArrayList<String> priceArrayList;
String[] idStrArray, urlStrArray, descrStrArray, mediumStrArray,
priceStrArray;
String urlPathStr = "http://www.mysite.com/"
+ jsonFileStr + ".txt";
JSONArray JSArrArtwork = null;
String idStr, urlStr, descrStr, mediumStr, priceStr;
ProgressDialog loadImagesDia;
Intent bundleIn;
#Override
protected void onPreExecute() {
super.onPreExecute();
// Create a progressdialog
loadImagesDia = new ProgressDialog(Main_Interface.this);
loadImagesDia.setMessage("Loading Images...");
loadImagesDia.setIndeterminate(false);
// Show progressdialog
loadImagesDia.show();
}
#Override
protected Void doInBackground(Void... params) {
hashArraylist = new ArrayList<HashMap<String, String>>();//
// Retrieve JSON Objects from the given URL address
jsonobject = JSONforGallery.getJSONfromURL(urlPathStr);
try {
// Locate the array name in JSON
JSArrArtwork = jsonobject.getJSONArray("artwork");
idArrayList = new ArrayList<String>();
urlArrayList = new ArrayList<String>();
descrArrayList = new ArrayList<String>();
mediumArrayList = new ArrayList<String>();
priceArrayList = new ArrayList<String>();
for (int i = 0; i < JSArrArtwork.length(); i++) {
HashMap<String, String> map = new HashMap<String, String>();//
JSONObject artworkJO = JSArrArtwork.getJSONObject(i);
map.put("id", artworkJO.getString(TAG_ID));//
map.put("url", artworkJO.getString(TAG_URL));//
map.put("descr", artworkJO.getString(TAG_DESCR));//
map.put("medium", artworkJO.getString(TAG_MEDIUM));//
map.put("price", artworkJO.getString(TAG_PRICE));//
idStr = artworkJO.getString(TAG_ID);
urlStr = artworkJO.getString(TAG_URL);
descrStr = artworkJO.getString(TAG_DESCR);
mediumStr = artworkJO.getString(TAG_MEDIUM);
priceStr = artworkJO.getString(TAG_PRICE);
hashArraylist.add(map);//
idArrayList.add(idStr);
urlArrayList.add(urlStr);
descrArrayList.add(descrStr);
mediumArrayList.add(mediumStr);
priceArrayList.add(priceStr);
idStrArray = idArrayList.toArray(new String[idArrayList
.size()]);
urlStrArray = urlArrayList.toArray(new String[urlArrayList
.size()]);
descrStrArray = descrArrayList
.toArray(new String[descrArrayList.size()]);
mediumStrArray = mediumArrayList
.toArray(new String[mediumArrayList.size()]);
priceStrArray = priceArrayList
.toArray(new String[priceArrayList.size()]);
}
} catch (JSONException e) {
Log.e("Error", e.getMessage());
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(Void args) {
loadImagesDia.dismiss();
bundleIn = new Intent("com.veedabugmedia.ktg.UILGRID");
bundleIn.putExtra("idStrArrayKey", idStrArray);
bundleIn.putExtra("hashARKey", hashArraylist);
bundleIn.putExtra("urlStrArrayKey", urlStrArray);
bundleIn.putExtra("descrStrArrayKey", descrStrArray);
bundleIn.putExtra("mediumStrArrayKey", mediumStrArray);
bundleIn.putExtra("priceStrArrayKey", priceStrArray);
startActivity(bundleIn);
}
}
My updated UILGrid Activity:
public class UILGrid extends AbsListViewBaseActivity {
String[] idStr, imageUrls, descrStrGrid, mediumStrGrid, priceStrGrid;
DisplayImageOptions options;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.uil_grid);
// Retrieve data from About_Interface on item click event
Intent getBundsIn = getIntent();
idStr = getBundsIn.getStringArrayExtra("idStrArrayKey");
imageUrls = getBundsIn.getStringArrayExtra("urlStrArrayKey");
descrStrGrid = getBundsIn.getStringArrayExtra("descrStrArrayKey");
mediumStrGrid = getBundsIn.getStringArrayExtra("mediumStrArrayKey");
priceStrGrid = getBundsIn.getStringArrayExtra("priceStrArrayKey");
options = new DisplayImageOptions.Builder()
.showImageOnLoading(R.drawable.ic_stub)
.showImageForEmptyUri(R.drawable.ic_empty)
.showImageOnFail(R.drawable.ic_error).cacheInMemory(true)
.cacheOnDisc(true).bitmapConfig(Bitmap.Config.RGB_565).build();
listView = (GridView) findViewById(R.id.uil_gridview);
((GridView) listView).setAdapter(new ImageAdapter());
listView.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
startImagePagerActivity(position);
}
});
}// --- END onCreate
private void startImagePagerActivity(int position) {
Intent pagerIn = new Intent(this, UILPager.class);
pagerIn.putExtra("pagerUrlStrKey", imageUrls);
pagerIn.putExtra("pagerDescrStrKey", descrStrGrid);
pagerIn.putExtra("pagerMediumStrKey", mediumStrGrid);
pagerIn.putExtra("pagerPriceStrKey", priceStrGrid);
pagerIn.putExtra("pagerPositionKey", position);
startActivity(pagerIn);
}
public class ImageAdapter extends BaseAdapter {
#Override
public int getCount() {
return imageUrls.length;
}
#Override
public Object getItem(int position) {
return null;
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
final ImageView imageView;
if (convertView == null) {
imageView = (ImageView) getLayoutInflater().inflate(
R.layout.uil_grid_item, parent, false);
} else {
imageView = (ImageView) convertView;
}
imageLoader.displayImage(imageUrls[position], imageView, options);
return imageView;
}
}
#Override
protected void onPause() {
super.onPause();
overridePendingTransition(R.anim.fadein, R.anim.fadeout);
UILGrid.this.finish();
}
}

How to add data to custom BaseAdapter for listView - Android

I have a custom BaseAdapter class that creates views for comments, usernames, and numbers. This BaseAdapter receives this information from An AsyncTask. The AsyncTask runs when the user reaches the bottom of the listView. The problem is the BaseAdapter wont add new data. When I try to add new data it deletes the current data in the list and then adds the new data. I want it to keep all the data and just add data to the bottom of the listView. All of these classes are in the same Activity. Here is my current code.
class CreateCommentLists extends BaseAdapter{
Context ctx_invitation;
String[] listComments;
String[] listNumbers;
String[] listUsernames;
public CreateCommentLists(String[] comments, String[] usernames, String[] numbers, DashboardActivity context)
{
super();
ctx_invitation = context;
listComments = comments;
listNumbers = usernames;
listUsernames = numbers;
}
#Override
public int getCount() {
if(null == listComments)
{
return 0;
}
// TODO Auto-generated method stub
return listComments.length;
}
#Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return listComments[position];
}
#Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
View v = null;
try
{
String inflater = Context.LAYOUT_INFLATER_SERVICE;
LayoutInflater li = (LayoutInflater)ctx_invitation.getSystemService(inflater);
v = li.inflate(R.layout.list_item, null);
TextView commentView = (TextView)v.findViewById(R.id.listComment);
TextView NumbersView = (TextView)v.findViewById(R.id.listNumber);
TextView usernamesView = (TextView)v.findViewById(R.id.listPostedBy);
Button usernameButton = (Button)v.findViewById(R.id.listUsernameButton);
Button numberButton = (Button)v.findViewById(R.id.listNumberButton);
commentView.setText(listComments[position]);
NumbersView.setText(listNumbers[position]);
usernamesView.setText(listUsernames[position]);
usernameButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent i = new Intent(getApplicationContext(), ProfileActivity.class);
i.putExtra("usernameOfProfile",listUsernames[position]);
startActivity(i);
finish();
}
});
numberButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
Intent i = new Intent(getApplicationContext(), ProfileActivity.class);
i.putExtra("NumberProfile",listNumbers[position]);
startActivity(i);
finish();
}
});
}
catch(Exception e)
{
e.printStackTrace();
}
return v;
}
public void add(String[] comments, String[] usernames,
String[] numbers) {
listComments = comments;
listNumbers = usernames;
listUsernames = numbers;
}
public int getCount1() {
if(null == listComments)
{
return 0;
}
// TODO Auto-generated method stub
return listComments.length;
}
public Object getItem1(int position) {
// TODO Auto-generated method stub
return listComments[position];
}
public long getItemId1(int position) {
// TODO Auto-generated method stub
return 0;
}
public View getView1(final int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
View v = null;
try
{
String inflater = Context.LAYOUT_INFLATER_SERVICE;
LayoutInflater li = (LayoutInflater)ctx_invitation.getSystemService(inflater);
v = li.inflate(R.layout.list_item, null);
TextView commentView = (TextView)v.findViewById(R.id.listComment);
TextView NumbersView = (TextView)v.findViewById(R.id.listNumber);
TextView usernamesView = (TextView)v.findViewById(R.id.listPostedBy);
Button usernameButton = (Button)v.findViewById(R.id.listUsernameButton);
Button numberButton = (Button)v.findViewById(R.id.listNumberButton);
commentView.setText(listComments[position]);
NumbersView.setText(listNumbers[position]);
usernamesView.setText(listUsernames[position]);
usernameButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent i = new Intent(getApplicationContext(), ProfileActivity.class);
i.putExtra("usernameOfProfile",listUsernames[position]);
startActivity(i);
finish();
}
});
numberButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
Intent i = new Intent(getApplicationContext(), ProfileActivity.class);
i.putExtra("NumberProfile",listNumbers[position]);
startActivity(i);
finish();
}
});
}
catch(Exception e)
{
e.printStackTrace();
}
return v;
}
final CreateCommentLists mycmlist = new CreateCommentLists(comments, usernames, numbers, DashboardActivity.this);
lstComments = (ListView)findViewById(android.R.id.list);
lstComments.setAdapter(mycmlist);
final ProgressDialog progDailog = new ProgressDialog(DashboardActivity.this);
class loadComments extends AsyncTask<JSONObject, String, JSONObject> {
#Override
protected void onPreExecute() {
super.onPreExecute();
progDailog.setIndeterminate(false);
progDailog.setCancelable(true);
progDailog.getWindow().clearFlags(WindowManager.LayoutParams.FLAG_DIM_BEHIND);
progDailog.show();
progDailog.setContentView(R.layout.progress_circle);
}
#Override
protected void onProgressUpdate(String... values) {
super.onProgressUpdate(values);
}
protected JSONObject doInBackground(JSONObject... params) {
JSONObject json2 = CollectComments.collectComments(usernameforcomments, offsetNumber);
return json2;
}
#Override
protected void onPostExecute(JSONObject json2) {
try {
if (json2.getString(KEY_SUCCESS) != null) {
registerErrorMsg.setText("");
String res2 = json2.getString(KEY_SUCCESS);
if(Integer.parseInt(res2) == 1){
JSONArray commentArray = json2.getJSONArray(KEY_COMMENT);
String comments[] = new String[commentArray.length()];
for ( int i=0; i<commentArray.length(); i++ ) {
comments[i] = commentArray.getString(i);
}
JSONArray numberArray = json2.getJSONArray(KEY_NUMBER);
String numbers[] = new String[numberArray.length()];
for ( int i=0; i<numberArray.length(); i++ ) {
numbers[i] = numberArray.getString(i);
}
JSONArray usernameArray = json2.getJSONArray(KEY_USERNAME);
String usernames[] = new String[usernameArray.length()];
for ( int i=0; i<usernameArray.length(); i++ ) {
usernames[i] = usernameArray.getString(i);
}
mycmlist.add(comments,usernames,numbers);
mycmlist.notifyDataSetChanged();
}//end if key is == 1
else{
// Error in registration
registerErrorMsg.setText(json2.getString(KEY_ERROR_MSG));
}//end else
}//end if
} //end try
catch (JSONException e) {
e.printStackTrace();
}//end catch
progDailog.dismiss();
}
}
mainListView = (ListView) findViewById(android.R.id.list);
class EndlessScrollListener implements OnScrollListener {
private int i = 0;
private int visibleThreshold = 5;
private int previousTotal = 0;
private boolean loading = true;
public EndlessScrollListener() {
}
public EndlessScrollListener(int visibleThreshold) {
this.visibleThreshold = visibleThreshold;
}
#Override
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
if ((firstVisibleItem + visibleItemCount) == totalItemCount) {
new loadComments().execute();
mainListView.smoothScrollToPosition(0);
}
}
#Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
}
}
mainListView.setOnScrollListener(new EndlessScrollListener());

You try this :
public class Comment {
String username;
String content;
String number;
}
Class Adapter:
public class CommentAdapter extends BaseAdapter {
private List<Comment> listComment;
private Context context;
public CommentAdapter(List<Comment> listComment, Context context) {
super();
this.listComment = listComment;
this.context = context;
}
#Override
public int getCount() {
return listComment.size();
}
#Override
public Comment getItem(int position) {
return listComment.get(position);
}
#Override
public long getItemId(int arg0) {
return 0;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View v = convertView;
if (v == null) {
LayoutInflater mInflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = mInflater.inflate(R.layout.comment_item, null);
}
final TextView textViewUsername = (TextView) v
.findViewById(R.id.comment_Username);
final TextView textViewNumber = (TextView) v
.findViewById(R.id.comment_number);
final TextView textViewContent = (TextView) v
.findViewById(R.id.comment_Content);
final String username = listComment.get(position).getUsername();
final String number= listComment.get(position).getNumber();
String content = listComment.get(position).getContent();
textViewUsername.setText(username);
textViewNumber.setText(number);
textViewContent.setText(content);
return v;
}
}
When you need to add new comment to list. just create new Comment and add to listComment(listComment.add(newComment)), after that, call adapter.notifyDataSetChanged();

package com.example.baseadapter;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends Activity implements OnItemClickListener {
public static final String[] title = new String[] {
"image 1", "image 2", "image 3", "image 4"
};
public static final Integer[] images = {
R.drawable.aa, R.drawable.bb, R.drawable.cc, R.drawable.cc, R.drawable.dd
};
ListView listview;
List<RowItem> rowItems;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
rowItems = new ArrayList<RowItem>();
for (int i = 0; i < title.length; i++) {
RowItem item = new RowItem(images[i], title[i]);
rowItems.add(item);
}
listview = (ListView)findViewById(R.id.listview);
customBaseAdapter cba = new customBaseAdapter(this, rowItems);
listview.setAdapter(cba);
listview.setOnItemClickListener(this);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
#Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
Toast.makeText(getApplicationContext(), "item selected", Toast.LENGTH_LONG).show();
}
public class customBaseAdapter extends BaseAdapter {
Context context;
List<RowItem> rowItem;
public customBaseAdapter(Context context, List<RowItem> listItem) {
this.context = context;
rowItem = listItem;
Log.d("const", "const");
}
#Override
public int getCount() {
Log.d("count", "count");
return rowItem.size();
}
#Override
public Object getItem(int arg0) {
Log.d("item", "item");
return rowItem.get(arg0);
}
#Override
public long getItemId(int position) {
Log.d("const", "item id");
return rowItem.indexOf(getItem(position));
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
Log.d("const", "getview");
LayoutInflater inflater = (LayoutInflater)context
.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
RowItem rowitem = (RowItem)getItem(position);
TextView textForTitle;
ImageView imgForImage;
convertView = inflater.inflate(R.layout.inflate, null);
textForTitle = (TextView)convertView.findViewById(R.id.textview);
imgForImage = (ImageView)convertView.findViewById(R.id.imageview);
textForTitle.setText(rowitem.getTitle());
imgForImage.setImageResource(rowitem.getImageId());
return convertView;
}
}
public class RowItem {
int imageId;
String title;
public RowItem(int imageId, String title) {
this.imageId = imageId;
this.title = title;
}
public int getImageId() {
return imageId;
}
public void setImageId(int imageId) {
this.imageId = imageId;
}
public String getTitle() {
return title;
}
public void setStringTitle(String title) {
this.title = title;
}
#Override
public String toString() {
return title;
}
}
}

Develop Reference

The Android operating system is a mobile operating system that was developed by Google (GOOGL?) to be primarily used for touchscreen devices, cell phones, and tablets.

Android - Custom Adapter and AsyncTask - android

SOLVED. Used: CartelleActivity.this instead CartelleActivity.class

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