I am a rookie in the Android world and I built up a small training SW based on the 2.1 Google API.
At that time I did not know yet about main thread and worker threads, so I put all my code in the main thread.
Since, I fixed it with async classes for my netwkork access to fit the 4.0 Google API.
Ok, but one last thing bothers me and I just can not find any clues.
It is about an AutoCompleteTextView on a field ville ("town" in french).
BEFORE (2.1):
public void onTextChanged(CharSequence s, int start, int before, int count)
{
String result = null;
InputStream is = null;
List<String> r = new ArrayList<String>();
if (ville.enoughToFilter())
{
is = connexionHttp(BASE_URL + "ville.php?ville=" + ville.getText());
result = lectureData(is);
try
{
JSONArray jArray = new JSONArray(result);
JSONObject json_data=null;
for(int i=0;i<jArray.length();i++)
{
json_data = jArray.getJSONObject(i);
r.add(json_data.getString("VILLE"));
a_idVil.add(json_data.getString("CLEF_VILLE"));
}
ville.setAdapter(new ArrayAdapter<String>(this,android.R.layout.simple_selectable_list_item,r));
ville.setOnItemSelectedListener(new villeListener());
}
catch(JSONException e1)
{
Toast.makeText(getBaseContext(),e1.toString() ,Toast.LENGTH_LONG).show();
Log.d("***** TestActivity/onTextChanged: JSONException *****", "--"+e1.toString()+"--");
}
catch(ParseException e1)
{
Toast.makeText(getBaseContext(),e1.toString() ,Toast.LENGTH_LONG).show();
Log.d("***** TestActivity/onTextChanged: ParseException *****", "--"+e1.toString()+"--");
}
}
}
public class villeListener implements OnItemSelectedListener
{
public void onItemSelected(AdapterView<?> parent, View v, int pos, long row)
{
villePosition = pos;
}
public void onNothingSelected(AdapterView<?> arg0) { }
}
runs 100% perfect:
-> after the 4th caracters, the query runs on MySql to find all the towns beginning with the 4 given letters, and displays the selection list to select the right one: OK
-> the listener give the index of the choosen town: OK
AFTER (4.0)
public void onTextChanged(CharSequence s, int start, int before, int count)
{
if (ville.enoughToFilter())
{
new RemplirVille().execute(BASE_URL + "ville.php?ville=" + ville.getText());
Log.d("***********","AVANT");
ville.setOnItemSelectedListener(new villeListener());
Log.d("***********","APRES");
}
}
public class villeListener implements OnItemSelectedListener
{
public void onItemSelected(AdapterView<?> parent, View v, int pos, long row)
{
villePosition = pos;
Log.d("*************9999999", "1111111111");
}
public void onNothingSelected(AdapterView<?> arg0) { }
}
class RemplirVille extends AsyncTask<String, String, List<String>>
{
Integer errorMsgId;
String errorMsgParam;
protected List<String> doInBackground(String... param)
{
List<String> listeAffichageVille = new ArrayList<String>();
ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
try
{
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(param[0]);
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
if (response.getStatusLine().getStatusCode() < 400)
{
HttpEntity entity = response.getEntity();
String entityStr = EntityUtils.toString(entity);
JSONArray json_array = new JSONArray(entityStr);
for(int i=0;i<json_array.length();i++)
{
JSONObject json_ligne = json_array.getJSONObject(i);
listeAffichageVille.add(json_ligne.getString("VILLE"));
a_idVil.add(json_ligne.getString("CLEF_VILLE"));
}
}
else
{
Log.d("***** TestActivity/ASYNC RemplirVille: EXCEPTION http error *****", "--"+response.getStatusLine().toString()+"--");
this.errorMsgId = R.string.http_site_error;
listeAffichageVille = null;
}
}
catch (Exception ex)
{
Log.d("***** TestActivity/ASYNC RemplirVille: EXCEPTION decode error *****", "--"+ex.toString()+"--");
this.errorMsgId = R.string.http_decode_error;
this.errorMsgParam = ex.getLocalizedMessage();
listeAffichageVille = null;
}
return listeAffichageVille;
}
protected void onProgressUpdate(String... item) { }
protected void onPreExecute(List<String> list) { }
protected void onPostExecute(List<String> list)
{
if (list == null)
{
if (this.errorMsgId != null)
{
String msg = TestActivity.this.getString(this.errorMsgId);
Toast.makeText(TestActivity.this,msg,Toast.LENGTH_LONG).show();
}
}
else
{
ville.setAdapter(new ArrayAdapter<String>(TestActivity.this,android.R.layout.simple_selectable_list_item,list));
}
}
}
runs with troubles:
-> you have to put in (enoughToFilter + 1) caractères to diplay the list of the towns: BAD
-> the listener is even not run anymore: BAD
In fact enoughToFilter works well, it launches the RemplirVille class which runs ok except that it does not displays the list!
But, if you put in 1 more caracter: -> enoughToFilter still working well -> RemplirVille brings the data one more time.... but this time the selection list displays well.
Any idea about that topic? I guess it is a context problem, but even with a GetApplicationCOntext I just can not get it.
Thanks.
