I created a simpleadapter with an HashMap to retrieve json datas. It works but i would create an ArrayAdapter instead. This is the simple adapter with json parsing:
@Override
protected void onPostExecute(JSONObject json) {
pDialog.dismiss();
try {
// Getting JSON Array from URL
rating = json.getJSONArray(TAG_ITEM);
for(int i = 0; i < rating.length(); i++)
{
JSONObject c = rating.getJSONObject(i);
// Storing JSON item in a Variable
String name = c.getString(TAG_NOME);
String commento = c.getString(TAG_COMMENTO);
String valore = c.getString(TAG_VALORE);
urlImage = c.getString(TAG_URLIMAGE);
String timestamp = c.getString(TAG_TIMESTAMP);
// Adding value HashMap key => value
HashMap<String, String> map = new HashMap<String, String>();
map.put(TAG_NOME, name);
map.put(TAG_COMMENTO, commento);
map.put(TAG_URLIMAGE, urlImage);
map.put(TAG_VALORE, "Voted: "+valore);
map.put(TAG_TIMESTAMP, timestamp);
oslist.add(map);
ListAdapter adapter = new SimpleAdapter(RatingDetailsActivty.this, oslist, R.layout.list_rating_item,
new String[]
{ TAG_NOME,
TAG_COMMENTO,
TAG_VALORE,
TAG_TIMESTAMP
}, new int[]
{
R.id.nome,
R.id.commento,
R.id.valore,
R.id.timestamp
})
{
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View v = super.getView(position, convertView, parent);
ImageView profileImage = (ImageView) v.findViewById(R.id.profile_img);
try {
@SuppressWarnings("unchecked")
HashMap<String, String> map = (HashMap<String, String>) getItem(position);
URL url = new URL(map.get(TAG_URLIMAGE));
imageProfilo = BitmapFactory.decodeStream(url.openConnection().getInputStream());
Log.i("Url immagine", url.toString()); // here there is only last one
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if (imageProfilo != null) {
profileImage.setImageBitmap(imageProfilo);
} else {
profileImage.setImageDrawable(v.getResources() .getDrawable(R.drawable.welcome));
}
return v;
}
};
list.setAdapter(adapter);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
i tried to transform this simple adapter and create a ArrayAdapter in this way:
@Override
protected void onPostExecute(JSONObject json) {
pDialog.dismiss();
try {
// Getting JSON Array from URL
rating = json.getJSONArray(TAG_ITEM);
for(int i = 0; i < rating.length(); i++)
{
JSONObject c = rating.getJSONObject(i);
// Storing JSON item in a Variable
String name = c.getString(TAG_NOME);
String commento = c.getString(TAG_COMMENTO);
String valore = c.getString(TAG_VALORE);
urlImage = c.getString(TAG_URLIMAGE);
String timestamp = c.getString(TAG_TIMESTAMP);
nomi.add(name);
commenti.add(commento);
valori.add(valore);
timestamps.add(timestamp);
adapter = new DetailsListAdapter(RatingDetailsActivty.this, nomi, valori, commenti, timestamps);
list.setAdapter(adapter);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
declaring as globals:
ArrayList<String> nomi;
ArrayList<String> valori;
ArrayList<String> commenti;
ArrayList<String> timestamps;
and this is the adapter:
public class DetailsListAdapter extends ArrayAdapter<String>{
//riferimenti statici alle risorse e agli id
private final static int LAYOUT = R.layout.list_rating_item;
private final static int NOME = R.id.nome;
private final static int VALORE = R.id.valore;
private final static int COMMENTO = R.id.commento;
private final static int TIMESTAMP = R.id.timestamp;
ArrayList<String> nomi = null; //lista dei nomi
ArrayList<String> valori; //lista dei valori
ArrayList<String> commenti; //lista dei commenti
ArrayList<String> timestamps; //lista dei ts
ArrayList<String> array;
Context c; //context
LayoutInflater inflater; //layout inflater
public DetailsListAdapter(Context context, ArrayList<String> nomi, ArrayList<String> valori, ArrayList<String> commenti, ArrayList<String> timestamps)
{
super(context,NOME);
this.c = context;
this.nomi = nomi;
this.valori = valori;
this.commenti = commenti;
this.timestamps = timestamps;
this.inflater = LayoutInflater.from(c);
this.array = new ArrayList<String>();
this.array.addAll(nomi);
}
@Override
public int getCount()
{
return nomi.size(); //ritorno lunghezza lista ( = numero dei titoli)
}
//quando la lista richiede una view
@Override
public View getView(int pos,View view,ViewGroup parent)
{
CacheRiga cache; //cache
if(view==null)//se è la prima volta che viene richiesta la view
{
// creo la view ma non l'attacco alla lista in quanto devo ancora modificare
// i testi delle textview
String data = nomi.get(pos);
view = inflater.inflate(LAYOUT, parent,false);
cache = new CacheRiga(); //inizializzo la cache
cache.nome = (TextView) view.findViewById(NOME); //collego titolo
cache.commento = (TextView) view.findViewById(VALORE);//collego descrizione
cache.valore = (TextView) view.findViewById(COMMENTO);//collego descrizione
cache.timestamp = (TextView) view.findViewById(TIMESTAMP);//collego descrizione
view.setTag(cache);//collego view con cache
}
else
{
cache = (CacheRiga) view.getTag(); //altrimenti prendo la cache dalla view
}
cache.nome.setText(nomi.get(pos)); //imposto il titolo
cache.commento.setText(commenti.get(pos)); // e la descrizione
cache.valore.setText(valori.get(pos)); // e la descrizione
cache.timestamp.setText(timestamps.get(pos)); // e la descrizione
return view;
}
private class CacheRiga {
public TextView nome; // cache titolo
public TextView commento; // cache descrizione
public TextView valore;
public TextView timestamp;
}
}
the app crashes in nomi.add(name); says the value is null... something is wrong?
