Bonjour,

Je suis entrain de suivre différents tutos pour me familiariser avec la programmation java/android.

J'ai repris un code issu d'un tuto (dipo ici) mais l'appli plante au démarrage.

Voici mon code :

package com.example.dlx;


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.ListActivity;
import android.net.ParseException;
import android.os.Bundle;
import android.util.Log;
import android.widget.ArrayAdapter;
import android.widget.Toast;

public class MainActivity extends ListActivity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //setContentView(R.layout.main);
        String result = null;
     InputStream is = null;
     JSONObject json_data=null;
     ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
     ArrayList<String> donnees = new ArrayList<String>();
    
     try{
     //commandes httpClient
     HttpClient httpclient = new DefaultHttpClient();
        HttpPost httppost = new HttpPost("http://10.0.2.2/mysql.php");
        httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
        HttpResponse response = httpclient.execute(httppost);
        HttpEntity entity = response.getEntity();
        is = entity.getContent();
     }
     catch(Exception e){
      Log.i("taghttppost",""+e.toString());
            Toast.makeText(getBaseContext(),e.toString() ,Toast.LENGTH_LONG).show();
       }
    
       
     //conversion de la réponse en chaine de caractère
        try
        {
         BufferedReader reader = new BufferedReader(new InputStreamReader(is,"UTF-8"));
         
         StringBuilder sb  = new StringBuilder();
         
         String line = null;
         
         while ((line = reader.readLine()) != null) 
         {
         sb.append(line + "\n");
         }
         
         is.close();
         
         result = sb.toString();
        }
        catch(Exception e)
        {
         Log.i("tagconvertstr",""+e.toString());
        }
        //recuperation des donnees json
        try{
          JSONArray jArray = new JSONArray(result);
            
             for(int i=0;i<jArray.length();i++)
             {
            
                   json_data = jArray.getJSONObject(i);
                   donnees.add(json_data.getString("login"));
                   //r.add(json_data.getString("categorie"));
                   
               }
                setListAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_expandable_list_item_1, donnees));
            }
            catch(JSONException e){
             Log.i("tagjsonexp",""+e.toString());
            } catch (ParseException e) {
             Log.i("tagjsonpars",""+e.toString());
       }
            
    }
}

Voici mon manifest :

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.dlx"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="15" />
    
  <uses-permission android:name="android.permission.INTERNET" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/title_activity_main" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

Voici le rendu de mysql.php dans mon navigateur

[{"0":"toto","login":"toto"},{"0":"tutu","login":"tutu"}]

Voici ce que me donne logcat :

Citation

08-11 06:13:20.950: E/AndroidRuntime(914): FATAL EXCEPTION: main
08-11 06:13:20.950: E/AndroidRuntime(914): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.dlx/com.example.dlx.MainActivity}: java.lang.NullPointerException
08-11 06:13:20.950: E/AndroidRuntime(914): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1955)
08-11 06:13:20.950: E/AndroidRuntime(914): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1980)
08-11 06:13:20.950: E/AndroidRuntime(914): at android.app.ActivityThread.access$600(ActivityThread.java:122)
08-11 06:13:20.950: E/AndroidRuntime(914): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1146)
08-11 06:13:20.950: E/AndroidRuntime(914): at android.os.Handler.dispatchMessage(Handler.java:99)
08-11 06:13:20.950: E/AndroidRuntime(914): at android.os.Looper.loop(Looper.java:137)
08-11 06:13:20.950: E/AndroidRuntime(914): at android.app.ActivityThread.main(ActivityThread.java:4340)
08-11 06:13:20.950: E/AndroidRuntime(914): at java.lang.reflect.Method.invokeNative(Native Method)
08-11 06:13:20.950: E/AndroidRuntime(914): at java.lang.reflect.Method.invoke(Method.java:511)
08-11 06:13:20.950: E/AndroidRuntime(914): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
08-11 06:13:20.950: E/AndroidRuntime(914): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
08-11 06:13:20.950: E/AndroidRuntime(914): at dalvik.system.NativeStart.main(Native Method)
08-11 06:13:20.950: E/AndroidRuntime(914): Caused by: java.lang.NullPointerException
08-11 06:13:20.950: E/AndroidRuntime(914): at org.json.JSONTokener.nextCleanInternal(JSONTokener.java:116)
08-11 06:13:20.950: E/AndroidRuntime(914): at org.json.JSONTokener.nextValue(JSONTokener.java:94)
08-11 06:13:20.950: E/AndroidRuntime(914): at org.json.JSONArray.<init>(JSONArray.java:87)
08-11 06:13:20.950: E/AndroidRuntime(914): at org.json.JSONArray.<init>(JSONArray.java:103)
08-11 06:13:20.950: E/AndroidRuntime(914): at com.example.dlx.MainActivity.onCreate(MainActivity.java:76)
08-11 06:13:20.950: E/AndroidRuntime(914): at android.app.Activity.performCreate(Activity.java:4465)
08-11 06:13:20.950: E/AndroidRuntime(914): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
08-11 06:13:20.950: E/AndroidRuntime(914): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1919)
08-11 06:13:20.950: E/AndroidRuntime(914): ... 11 more

Si quelqu'un a un début de piste, je suis preneur... Si je n'arrive même pas à suivre un tuto je suis mal parti.... :-(

Merci pour votre aide.

Bonjour,

A première vue, ton string result vaut null. Soit il n'arrive pas à le récupérer par ta requête HTTP, soit il est mal converti en String.

PS : J'ai rajouté le tag dans le titre de ton sujet afin qu'il soit conforme aux règles du forum "Mobile". Merci de faire attention à l'avenir.

Merci pour la réponse, je vais suivre cette piste....