Ajouter items dynamiquement à une ListView
Bonjour,
Je récupère des articles de mon site Web que je récupère grâce à Json et que je met dans une ListView avec un Adapter personnalisé. Par défaut j'affiche les 5 premiers articles. J'aimerais que lorsque l'on arrive à la fin de la ListView donc à la fin du dernière article, 5 nouveaux items apparaissent dynamiquement. J'ai trouvé un exemple sur Internet (voir code) mais je n'arrive pas à le mettre en place dans mon cas. Pourriez-vous m'aider ? Merci.
Mon Activité :
Code:
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| package com.applicazione;
import java.util.ArrayList;
import java.util.HashMap;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import com.applicazione.R;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.Window;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.AdapterView.OnItemClickListener;
public class Bastia1905Activity extends Activity {
/** Called when the activity is first created. */
private myBaseAdapter adapter = null;
private ListView lv;
int itemPerPage = 5;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.attualita);
ArrayList<HashMap<String, String>> mylist = new ArrayList<HashMap<String, String>>();
JSONObject json = JSONfunctions.getJSONfromURL("http://bastia1905.com/android/export_android.php?nb_article="+itemPerPage);
try{
JSONArray earthquakes = json.getJSONArray("articles");
for(int i=0;i<earthquakes.length();i++){
HashMap<String, String> map = new HashMap<String, String>();
JSONObject e = earthquakes.getJSONObject(i);
map.put("id", String.valueOf(i));
map.put("titre", e.getString("titre"));
map.put("extrait", e.getString("extrait"));
map.put("thumb", e.getString("thumb"));
map.put("date", e.getString("date"));
map.put("img_article", e.getString("img_article"));
map.put("detail", e.getString("detail"));
mylist.add(map);
}
}catch(JSONException e) {
Log.e("log_tag", "Error parsing data "+e.toString());
}
adapter = new myBaseAdapter(this,this,mylist);
lv = (ListView)findViewById(R.id.list);
lv.setAdapter(adapter);
lv.setTextFilterEnabled(true);
lv.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
@SuppressWarnings("unchecked")
HashMap<String, String> o = (HashMap<String, String>) lv.getItemAtPosition(position);
// Nous définissons notre intent en lui disant quelle classe il faut utiliser
Intent affichearticle = new Intent(getApplicationContext(),ArticleActivity.class);
affichearticle.putExtra("titre", o.get("titre"));
affichearticle.putExtra("detail", o.get("detail"));
affichearticle.putExtra("img_article", o.get("img_article"));
// On appelle l'activity
startActivity(affichearticle);
}
});
}
} |
Exemple de ListView avec chargement dynamique
Code:
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| package com.never;
import java.util.ArrayList;
import java.util.Calendar;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
public class NeverEndingActivity extends Activity {
//how many to load on reaching the bottom
int itemsPerPage = 5;
boolean loadingMore = false;
ArrayList<String> myListItems;
ArrayAdapter<String> adapter;
//For test data :-)
Calendar d = Calendar.getInstance();
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.listplaceholder);
//This will hold the new items
myListItems = new ArrayList<String>();
adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, myListItems);
ListView list = (ListView)findViewById(R.id.list);
//add the footer before adding the adapter, else the footer will nod load!
View footerView = ((LayoutInflater)this.getSystemService(Context.LAYOUT_INFLATER_SERVICE)).inflate(R.layout.listfooter, null, false);
list.addFooterView(footerView);
//Set the adapter
list.setAdapter(adapter);
//Here is where the magic happens
list.setOnScrollListener(new OnScrollListener(){
//useless here, skip!
public void onScrollStateChanged(AbsListView view, int scrollState) {}
//dumdumdum
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
//what is the bottom iten that is visible
int lastInScreen = firstVisibleItem + visibleItemCount;
//is the bottom item visible & not loading more already ? Load more !
if((lastInScreen == totalItemCount) && !(loadingMore)){
Thread thread = new Thread(null, loadMoreListItems);
thread.start();
}
}
});
//Load the first 15 items
Thread thread = new Thread(null, loadMoreListItems);
thread.start();
}
//Runnable to load the items
private Runnable loadMoreListItems = new Runnable() {
public void run() {
//Set flag so we cant load new items 2 at the same time
loadingMore = true;
//Reset the array that holds the new items
myListItems = new ArrayList<String>();
//Simulate a delay, delete this on a production environment!
try { Thread.sleep(1000);
} catch (InterruptedException e) {}
//Get 15 new listitems
for (int i = 0; i < itemsPerPage; i++) {
//Fill the item with some bogus information
myListItems.add("Date: " + (d.get(Calendar.MONTH)+ 1) + "/" + d.get(Calendar.DATE) + "/" + d.get(Calendar.YEAR) );
// +1 day :-D
d.add(Calendar.DATE, 1);
}
//Done! now continue on the UI thread
runOnUiThread(returnRes);
}
};
//Since we cant update our UI from a thread this Runnable takes care of that!
private Runnable returnRes = new Runnable() {
public void run() {
//Loop thru the new items and add them to the adapter
if(myListItems != null && myListItems.size() > 0){
for(int i=0;i<myListItems.size();i++)
adapter.add(myListItems.get(i));
}
;
//Tell to the adapter that changes have been made, this will cause the list to refresh
adapter.notifyDataSetChanged();
//Done loading more.
loadingMore = false;
}
};
} |
