Listview mostra un solo item, baseadapter

Ciao a tutti, non riesco proprio a risolvere questo problema, magari voi potete aiutarmi:
per mostrare gli item di una list view ho creato una classe che estende BaseAdapter:
 public class SpeechBubbleAdapter extends BaseAdapter { private Context context; private ArrayList<HashMap<String,String>> msgMap_al = new ArrayList<HashMap<String,String>>(); private String msg; private String sender; private final String KEY_MSG = "message"; private final String KEY_SENDER = "sender"; private final String KEY_DATETIME = "datetime"; public SpeechBubbleAdapter(Context context,ArrayList<HashMap<String,String>> messages){ this.context=context; msgMap_al = messages; } @Override public int getCount() { return msgMap_al.size(); } @Override public Object getItem(int position) { return msgMap_al.get(position).get(KEY_MSG); } @Override public long getItemId(int position) { return position; } class ViewHolder { TextView speech_text_view; TextView datetime_text_view; } @Override public View getView(int position, View convertView, ViewGroup parent) { ViewHolder holder; if(convertView == null) { LayoutInflater inflater = (LayoutInflater)context.getSystemService (Context.LAYOUT_INFLATER_SERVICE); convertView = inflater.inflate(R.layout.speech_bubble, parent, false); } holder = new ViewHolder(); holder.speech_text_view = (TextView) convertView.findViewById(R.id.message_text_view); holder.datetime_text_view = (TextView) convertView.findViewById(R.id.datetime_text_view); Log.d("SpeechBubbleAdapter: ","Message: "+msgMap_al.get(position).get(KEY_MSG)+" | Datetime: "+msgMap_al.get(position).get(KEY_DATETIME)+" | Position: "+position); holder.speech_text_view.setText(msgMap_al.get(position).get(KEY_MSG)); holder.datetime_text_view.setText(msgMap_al.get(position).get(KEY_DATETIME)); LayoutParams lp = (LayoutParams) holder.speech_text_view.getLayoutParams(); if(msgMap_al.get(position).get(KEY_SENDER)=="a******@live.it") { lp.gravity = Gravity.RIGHT; } else { lp.gravity = Gravity.LEFT; } holder.speech_text_view.setLayoutParams(lp); return convertView; } }
Questo adapter viene utilizzato da questa activity:
public class ChatActivity extends Activity implements LoaderManager.LoaderCallbacks<Cursor>{ EditText msg_et; private String recipient; private EditText ed; private final String KEY_MSG = "message"; private final String KEY_SENDER = "sender"; private final String KEY_RECIPIENT = "recipient"; private final String KEY_DATETIME= "datetime"; private SpeechBubbleAdapter sb; private ListView lv; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.chat_activity); ed = (EditText) findViewById(R.id.edit_text); msg_et = (EditText) findViewById(R.id.edit_text); recipient = getIntent().getExtras().getString(new ContactsListFragment().KEY_EMAIL); lv =(ListView) findViewById(R.id.chat_list_view); Bundle b = new Bundle(); b.putString(KEY_RECIPIENT,recipient); LoaderManager lm = getLoaderManager(); lm.initLoader(0, b, this); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.chat, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } public void onClickSendButton(View v) { ContentValues cv = new ContentValues(); cv.put(SandMessagesProvider.KEY_SENDER, "Caco@caco.it"); // sender = variabile globale cv.put(SandMessagesProvider.KEY_RECIPIENT, recipient); cv.put(SandMessagesProvider.KEY_DATETIME, FormattedDateTime.getDateTime()); cv.put(SandMessagesProvider.KEY_TEXT, ed.getText().toString()); ed.setText(""); ContentResolver cr = getContentResolver(); Uri rowUri = cr.insert(SandMessagesProvider.CONTENT_URI, cv); } @Override public Loader<Cursor> onCreateLoader(int id, Bundle args) { String[] projection = {SandMessagesProvider.KEY_SENDER,SandMessagesProvider.KEY_DATETIME,SandMessagesProvider.KEY_TEXT}; String where = SandMessagesProvider.KEY_SENDER+"=?"+" OR " + SandMessagesProvider.KEY_RECIPIENT+"=?"; String[] whereArgs ={args.getString(KEY_RECIPIENT),args.getString(KEY_RECIPIENT)}; String sortOrder = SandMessagesProvider.KEY_ID; Uri queryUri = SandMessagesProvider.CONTENT_URI; CursorLoader cl = new CursorLoader(this, queryUri, projection, where, whereArgs, sortOrder); return cl; } @Override public void onLoadFinished(Loader<Cursor> loader, Cursor data) { if (data.getCount()>0){ ArrayList<HashMap<String,String>> al = new ArrayList<HashMap<String, String>>(); int i=0; while (data.moveToNext()){ //Log.d("ChatActivity","New hashmap "+i); HashMap<String,String> hm=new HashMap<String, String>();; hm.put(KEY_SENDER,data.getString(0)); hm.put(KEY_DATETIME,data.getString(1)); hm.put(KEY_MSG,data.getString(2)); Log.d("ChatActivity: ","Message: "+hm.get(KEY_MSG)+" | Datetime: "+hm.get(KEY_DATETIME)); al.add(hm); i++; } sb = new SpeechBubbleAdapter(this,al); lv.setAdapter(sb); } } @Override public void onLoaderReset(Loader<Cursor> loader) { } }

Quando lancio l'applicazione nella list view viene mostrato un solo item. Questo è il logcat:

codice:

07-21 09:08:36.010 656-656/com.wix.caco85.sand I/ActivityThread﹕ Pub com.wix.caco85.sand.sandcontactsprovider: com.wix.caco85.sand.database.SandContactsProvider 07-21 09:08:36.044 656-656/com.wix.caco85.sand I/ActivityThread﹕ Pub com.wix.caco85.sand.sandmessagesprovider: com.wix.caco85.sand.database.SandMessagesProvider 07-21 09:08:36.462 656-659/com.wix.caco85.sand D/dalvikvm﹕ GC_CONCURRENT freed 200K, 2% free 14329K/14599K, paused 8ms+4ms 07-21 09:08:36.540 656-656/com.wix.caco85.sand D/gralloc_goldfish﹕ Emulator without GPU emulation detected. 07-21 09:09:00.380 656-656/com.wix.caco85.sand D/ChatActivity:﹕ Message: hey | Datetime: 14/7/14 9:34:23 07-21 09:09:00.380 656-656/com.wix.caco85.sand D/ChatActivity:﹕ Message: ciao caco | Datetime: 14/7/14 9:37:43 07-21 09:09:00.380 656-656/com.wix.caco85.sand D/ChatActivity:﹕ Message: h | Datetime: 15/7/14 8:2:32 07-21 09:09:00.380 656-656/com.wix.caco85.sand D/ChatActivity:﹕ Message: ciaooo | Datetime: 15/7/14 8:2:39 07-21 09:09:00.380 656-656/com.wix.caco85.sand D/ChatActivity:﹕ Message: heyla | Datetime: 15/7/14 8:6:29 07-21 09:09:00.380 656-656/com.wix.caco85.sand D/ChatActivity:﹕ Message: ciao | Datetime: 15/7/14 13:31 07-21 09:09:00.390 656-656/com.wix.caco85.sand D/ChatActivity:﹕ Message: hey | Datetime: 15/7/14 13:32 07-21 09:09:00.450 656-656/com.wix.caco85.sand D/SpeechBubbleAdapter:﹕ Message: hey | Datetime: 14/7/14 9:34:23 | Position: 0 07-21 09:09:00.460 656-656/com.wix.caco85.sand D/SpeechBubbleAdapter:﹕ Message: hey | Datetime: 14/7/14 9:34:23 | Position: 0 07-21 09:09:00.460 656-656/com.wix.caco85.sand D/SpeechBubbleAdapter:﹕ Message: hey | Datetime: 14/7/14 9:34:23 | Position: 0 07-21 09:09:01.150 656-659/com.wix.caco85.sand D/dalvikvm﹕ GC_CONCURRENT freed 65K, 1% free 14718K/14855K, paused 5ms+114ms