avoir des problèmes avec les données json et Android

Question

Je suis coincé avec ce problème. J'essaye de tirer quelques données de json d'une base de données mysql. Je veux actuellement utiliser un AsyncTask pour faire la plupart du travail en arrière-plan et potentiellement utiliser différents scripts php pour exécuter différentes requêtes retourner des données différentes (c'est pourquoi je n'ai pas inséré l'URL directe dans le httpost)

Fondamentalement maintenant , Je veux récupérer les données de la base de données, les passer dans une variable et ensuite afficher cette variable dans un TextView. Lorsque j'exécute le code, il affiche simplement "No Data" dans le TextView, donc quelque chose ne fonctionne pas. Mon fichier php fonctionne bien! Heres le code: Toute aide grandement appréciée :)

package com.example.test1; 



import java.io.BufferedReader; 
import java.io.InputStream; 
import java.io.InputStreamReader; 
import java.util.ArrayList; 

import org.apache.http.HttpEntity; 
import org.apache.http.HttpResponse; 
import org.apache.http.NameValuePair; 
import org.apache.http.client.HttpClient; 
import org.apache.http.client.entity.UrlEncodedFormEntity; 
import org.apache.http.client.methods.HttpPost; 
import org.apache.http.impl.client.DefaultHttpClient; 
import org.json.JSONArray; 
import org.json.JSONException; 
import org.json.JSONObject; 

import android.app.Activity; 
import android.net.ParseException; 
import android.os.AsyncTask; 
import android.os.Bundle; 
import android.util.Log; 
import android.widget.TextView; 

public class clubpage extends Activity { 

TextView test; 
String clubphp = "http://10.0.2.2/corkgaa/Nemo.php"; 
String event = "No Data"; 
String name = "No Data"; 
String price = "No Data"; 


@Override 
protected void onCreate(Bundle savedInstanceState) { 
    // TODO Auto-generated method stub 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.clubpage); 

    test = (TextView)findViewById(R.id.clubinfo); 

    new Dbhandler().execute(clubphp); 

    test.setText(name);  

} 

public class Dbhandler extends AsyncTask<String, Void, String> { 

    @Override 
    protected String doInBackground(String... arg0) { 
     // TODO Auto-generated method stub 
     JSONArray jArray; 
     String result = "no response"; 
     InputStream is = null; 
     StringBuilder sb = null; 

     ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(); 
     //http post 
     try{ 
      HttpClient httpclient = new DefaultHttpClient(); 
      HttpPost httppost = new HttpPost("clubphp"); 
      httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs)); 
      HttpResponse response = httpclient.execute(httppost); 
      HttpEntity entity = response.getEntity(); 
      is = entity.getContent(); 
      } 
     catch(Exception e){ 
       Log.e("log_tag", "Error in http connection"+e.toString()); 
      } 

     //convert response to string 
     try{ 
      BufferedReader reader = new BufferedReader(new InputStreamReader(is,"iso-8859-1"),8); 
      sb = new StringBuilder(); 
      sb.append(reader.readLine() + "\n"); 
      String line="0"; 
      while ((line = reader.readLine()) != null) { 
       sb.append(line + "\n"); 
       } 
      is.close(); 
      result=sb.toString(); 
      } 
     catch(Exception e){ 
      Log.e("log_tag", "Error converting result "+e.toString()); 
      } 

     //parsing data 

     try{ 
      jArray = new JSONArray(result); 
     JSONObject json_data=null; 

     for(int i=0;i<jArray.length();i++){ 
      json_data = jArray.getJSONObject(i); 
      name=json_data.getString("NAME"); 
      event=json_data.getString("EVENT"); 
      price=json_data.getString("PRICE"); 
      } 
     } 
     catch(JSONException e1){ 

      } 
     catch (ParseException e1) { 
      e1.printStackTrace(); 
      } 
     return name; 
    } 

} 

@Override 
protected void onPause() { 
    // TODO Auto-generated method stub 
    super.onPause(); 
} 

}

chat journal:

03-04 15:25:35.139: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:35.149: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:35.239: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:35.259: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:35.259: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:35.270: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:35.279: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:35.279: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:35.312: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:35.312: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:35.349: I/ActivityManager(288): START u0 {cmp=com.example.test1/.clubpage} from pid 791 
03-04 15:25:35.369: W/WindowManager(288): Failure taking screenshot for (246x410) to layer 21020 
03-04 15:25:35.389: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:35.419: W/Trace(288): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:35.429: W/Trace(288): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:35.438: W/Trace(288): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:35.459: W/Trace(288): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:35.479: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:35.479: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:35.479: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:35.588: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:35.588: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:35.609: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:36.028: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:36.099: I/Choreographer(791): Skipped 31 frames! The application may be doing too much work on its main thread. 
03-04 15:25:36.109: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:36.168: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:36.268: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:36.279: W/Trace(288): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:36.279: W/Trace(288): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:36.289: V/PhoneStatusBar(580): setLightsOn(true) 
03-04 15:25:36.299: W/Trace(288): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:36.358: W/Trace(288): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:36.409: E/SurfaceFlinger(36): ro.sf.lcd_density must be defined as a build property 
03-04 15:25:36.409: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:36.421: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:36.439: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:36.439: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:36.439: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:36.729: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:36.729: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:36.773: I/Choreographer(791): Skipped 158 frames! The application may be doing too much work on its main thread. 
03-04 15:25:36.779: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:36.779: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:37.209: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:37.209: W/Trace(288): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:37.240: I/ActivityManager(288): Displayed com.example.test1/.clubpage: +1s832ms 
03-04 15:25:37.269: W/Trace(288): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:37.269: W/Trace(288): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:37.299: W/Trace(288): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:37.309: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:37.331: W/Trace(288): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:37.399: W/Trace(288): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:37.589: I/Choreographer(791): Skipped 48 frames! The application may be doing too much work on its main thread. 
03-04 15:25:37.649: D/dalvikvm(288): GC_CONCURRENT freed 980K, 35% free 7576K/11552K, paused 9ms+56ms, total 701ms 
03-04 15:25:37.859: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:37.859: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:37.911: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:37.911: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:37.919: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:37.949: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:38.214: W/Trace(288): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:38.250: W/Trace(288): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:38.250: W/Trace(288): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:38.309: W/Trace(288): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:38.369: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:38.409: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:38.419: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:38.439: W/Trace(288): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:38.479: W/Trace(288): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:38.519: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:38.530: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:38.530: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:38.549: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:38.549: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:38.549: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:38.549: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:38.629: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:38.629: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:38.690: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:38.699: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:38.699: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:38.719: W/Trace(288): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:38.739: W/Trace(288): Unexpected value from nativeGetEnabledTags: 0 
03-04 15:25:38.759: W/Trace(791): Unexpected value from nativeGetEnabledTags: 0 

Answer 1

Vous aurez besoin d'ajouter une méthode onPostExecute() à votre classe Dbhandler et définir le texte du TextView valeur dans cette méthode:

public class Dbhandler extends AsyncTask<String, Void, String> { 
    @Override 
    protected String doInBackground(String... arg0) { 
     [...] 
     return name; 
    } 

    @Override 
    protected void onPostExecute(String newName) { 
     test.setText(newName); 
    } 
} 

Answer 2

HttpPost httppost = new HttpP ost ("clubphp");

il suffit de remplacer cette ligne par le code suivant

HttpPost HttpPost = new HttpPost (arg0 [0]);

et

mettre en œuvre sur le poteau exécuter comme suit

@Override 
    protected void onPostExecute(String resultName) { 
     test.setText(resultName); 
    } 

espère qu'il fonctionnera juste après le chat journal ici encore si vous trouvez un problème

Answer 3

Essayez de remplacer votre 10.0.2.2 avec l'adresse IP de votre système et ajoutez un journal qui imprime le nom avant de renvoyer le nom. Dans doInbackground pour connaître l'adresse IP de votre système exécutez ipconfig dans l'invite de commande