bonjour a tous ,

j ai un probleme dans mon code( je developpe sous android studio) il me mets cette erreur 

03-11 18:31:11.935    1936-1936/learn2crack.asynctask I/Choreographer﹕ Skipped 61 frames!  The application may be doing too much work on its main thread.
03-11 18:31:12.250    1936-1936/learn2crack.asynctask D/gralloc_goldfish﹕ Emulator without GPU emulation detected.
03-11 18:31:12.358    1936-1948/learn2crack.asynctask I/art﹕ Background sticky concurrent mark sweep GC freed 3616(177KB) AllocSpace objects, 1(20KB) LOS objects, 44% free, 348KB/623KB, paused 141.520ms total 791.444ms
03-11 18:31:12.437    1936-1936/learn2crack.asynctask I/Choreographer﹕ Skipped 104 frames!  The application may be doing too much work on its main thread.
03-11 18:33:56.542    1936-1948/learn2crack.asynctask I/art﹕ Background partial concurrent mark sweep GC freed 452(39KB) AllocSpace objects, 1(20KB) LOS objects, 56% free, 401KB/913KB, paused 68.454ms total 288.716ms
03-11 18:33:57.829    1936-1936/learn2crack.asynctask I/Choreographer﹕ Skipped 425 frames!  The application may be doing too much work on its main thread.
03-11 18:33:58.225    1936-1936/learn2crack.asynctask I/Choreographer﹕ Skipped 80 frames!  The application may be doing too much work on its main thread.
03-11 18:33:59.354    1936-1936/learn2crack.asynctask I/Choreographer﹕ Skipped 287 frames!  The application may be doing too much work on its main thread.
03-11 18:53:58.590    1936-1936/learn2crack.asynctask I/Choreographer﹕ Skipped 88 frames!  The application may be doing too much work on its main thread.
03-11 18:53:58.881    1936-1936/learn2crack.asynctask I/Choreographer﹕ Skipped 66 frames!  The application may be doing too much work on its main thread.
03-11 18:53:59.063    1936-1936/learn2crack.asynctask I/Choreographer﹕ Skipped 41 frames!  The application may be doing too much work on its main thread.
03-11 18:53:59.417    1936-1936/learn2crack.asynctask I/Choreographer﹕ Skipped 65 frames!  The application may be doing too much work on its main thread.
03-11 18:53:59.712    1936-1936/learn2crack.asynctask I/Choreographer﹕ Skipped 76 frames!  The application may be doing too much work on its main thread.
03-11 18:53:59.921    1936-1936/learn2crack.asynctask I/Choreographer﹕ Skipped 45 frames!  The application may be doing too much work on its main thread.
03-11 18:54:00.183    1936-1936/learn2crack.asynctask I/Choreographer﹕ Skipped 65 frames!  The application may be doing too much work on its main thread.
03-11 18:54:00.191    1936-2420/learn2crack.asynctask E/JSON Parser﹕ Error parsing data org.json.JSONException: Unterminated array at character 13 of {n"user": [n{n"id": "001",n"name": "Raj Amal",n"email": "raj.amalw@gmail.com"n}n]n}n
03-11 18:54:00.417    1936-1936/learn2crack.asynctask I/Choreographer﹕ Skipped 59 frames!  The application may be doing too much work on its main thread.
03-11 18:54:00.624    1936-1936/learn2crack.asynctask D/AndroidRuntime﹕ Shutting down VM
    --------- beginning of crash
03-11 18:54:00.625    1936-1936/learn2crack.asynctask E/AndroidRuntime﹕ FATAL EXCEPTION: main
    Process: learn2crack.asynctask, PID: 1936
    java.lang.NullPointerException: Attempt to invoke virtual method 'org.json.JSONArray org.json.JSONObject.getJSONArray(java.lang.String)' on a null object reference
            at learn2crack.asynctask.MainActivity$JSONParse.onPostExecute(MainActivity.java:71)
            at learn2crack.asynctask.MainActivity$JSONParse.onPostExecute(MainActivity.java:42)
            at android.os.AsyncTask.finish(AsyncTask.java:632)
            at android.os.AsyncTask.access$600(AsyncTask.java:177)
            at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:645)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5221)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)

mon MainActivity.java 

package learn2crack.asynctask;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import learn2crack.asynctask.library.JSONParser;
public class MainActivity extends Activity {
    TextView uid;
    TextView name1;
    TextView email1;
    Button Btngetdata;
    //URL to get JSON Array
    private static String url = "http://monurl.com/json.php";
    //JSON Node Names
    private static final String TAG_USER = "user";
    private static final String TAG_ID = "id";
    private static final String TAG_NAME = "name";
    private static final String TAG_EMAIL = "email";
    JSONArray user = null;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Btngetdata = (Button)findViewById(R.id.getdata);
        Btngetdata.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                new JSONParse().execute();
            }
        });




    }
    private class JSONParse extends AsyncTask<String, String, JSONObject> {
        private ProgressDialog pDialog;
        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            uid = (TextView)findViewById(R.id.uid);
            name1 = (TextView)findViewById(R.id.name);
            email1 = (TextView)findViewById(R.id.email);
            pDialog = new ProgressDialog(MainActivity.this);
            pDialog.setMessage("Getting Data ...");
            pDialog.setIndeterminate(false);
            pDialog.setCancelable(true);
            pDialog.show();
        }
        @Override
        protected JSONObject doInBackground(String... args) {
            JSONParser jParser = new JSONParser();
            // Getting JSON from URL
            JSONObject json = jParser.getJSONFromUrl(url);
            return json;
        }



        @Override
        protected void onPostExecute(JSONObject json) {
            pDialog.dismiss();
            try {
                // Getting JSON Array
                user = json.getJSONArray(TAG_USER);
                JSONObject c = user.getJSONObject(0);
                // Storing  JSON item in a Variable
                String id = c.getString(TAG_ID);
                String name = c.getString(TAG_NAME);
                String email = c.getString(TAG_EMAIL);
                //Set JSON Data in TextView
                uid.setText(id);
                name1.setText(name);
                email1.setText(email);
            } catch (JSONException e) {
                e.printStackTrace();
            }
        }
    }
}

et mon JSONParser.java

package learn2crack.asynctask.library;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONException;
import org.json.JSONObject;
import android.util.Log;
public class JSONParser {
    static InputStream is = null;
    static JSONObject jObj = null;
    static String json = "";
    // constructor
    public JSONParser() {
    }
    public JSONObject getJSONFromUrl(String url) {
        // Making HTTP request
        try {
            // defaultHttpClient
            DefaultHttpClient httpClient = new DefaultHttpClient();
            HttpPost httpPost = new HttpPost(url);
            HttpResponse httpResponse = httpClient.execute(httpPost);
            HttpEntity httpEntity = httpResponse.getEntity();
            is = httpEntity.getContent();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        try {
            BufferedReader reader = new BufferedReader(new InputStreamReader(
                    is, "iso-8859-1"), 8);
            StringBuilder sb = new StringBuilder();
            String line = null;
            while ((line = reader.readLine()) != null) {
                sb.append(line + "n");
            }
            is.close();
            json = sb.toString();
        } catch (Exception e) {
            Log.e("Buffer Error", "Error converting result " + e.toString());
        }
        // try parse the string to a JSON object
        try {
            jObj = new JSONObject(json);
        } catch (JSONException e) {
            Log.e("JSON Parser", "Error parsing data " + e.toString());
        }
        // return JSON String
        return jObj;
    }
}

sans oublier mon internet permission

Merci d avance

A priori, dans la ligne de code suivante :

user = json.getJSONArray(TAG_USER);

l'objet json est null

oui mais comme faire pour eviter cela ?

Le problème vient visiblement du JSON renvoyé par ton URL qui n'est pas valide comme indiqué dans le logcat :

Error parsing data org.json.JSONException: Unterminated array at character 13 of {n"user": [n{n"id": "001",n"name": "Raj Amal",n"email": "raj.amalw@gmail.com"n}n]n}n

ok merci voici mon json 

{ "user": [ { "id": "001", "name": "Raj Amal", "email": "raj.amalw@gmail.com" } ] }

C'est bien il est beau...

D'après le logcat, tu as des "n" qui traînent dans celui qui est renvoyé par ton web-service.

-
Edité par rolandl 15 mars 2015 à 16:18:00

il transforme les espace en "n" si je suprime les espace cela sera tjrs correcte en json?

merci cela marche j ai supprimer les espaces