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PODisplay a JSONArray with a JSONObject inside into an Android listview
 

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  1. PODisplay a JSONArray with a JSONObject inside into an Android listview
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    <p>I have this this jsonArray with a jsonArray that has a jsonobject (alergenos) and I want to parse it into an android listview but I always get NullPointerException when I try listview.setAdapter(JsonAdapter);</p> <p>This is my json response:</p> <pre><code>{"valor": [{ "barcode":"8416400610992", "nombre":"Chicles Trident", "foto":"alood-52224273e4b90-foto1.jpg", "revision":{ "date":"2013-08-31 21:22:27","timezone_type":3,"timezone":"Europe\/Paris"}, "alergenos":[ {"id":4,"alergeno":"Melocoton","valor":0}, {"id":3,"alergeno":"Cacahuetes","valor":1} ], "calorias":250, "puntos":0, "fabricante":"Sonia" }] } </code></pre> <p>I get the alergenos data correctly, like this:</p> <pre><code>JSONArray jArray = respJSON.getJSONArray("alergenos"); for (int n = 0; n &lt; jArray.length(); n++) { JSONObject str_value = jArray.getJSONObject(n); String id = str_value.getString("id"); String name = str_value.getString("alergeno"); int value = str_value.getInt("valor"); } AlergProdAdapter jSONAdapter = new AlergProdAdapter(Scan_Result.this, jArray); listview.setAdapter(jSONAdapter); </code></pre> <p>This is my adapter:</p> <pre><code> class AlergProdAdapter extends BaseAdapter { private final Activity activity; private final JSONArray jsonArray; final static ArrayList&lt;AlergenosProducto&gt; alergProd = new ArrayList&lt;AlergenosProducto&gt;(); AlergProdAdapter(Activity activity, JSONArray jsonArray) { assert activity != null; assert jsonArray != null; this.jsonArray = jsonArray; this.activity = activity; String name = null; int value = 0; String id = null; String image = null; for (int position = 0; position &lt; jsonArray.length(); position++) { JSONObject json_data = getItem(position); if (null != json_data) { try { id = json_data.getString("id"); Log.i("da", id); name = json_data.getString("alergeno"); Log.i("da", name); value = json_data.getInt("valor"); if(value == 1){ image = "imagenroja"; }else{ image = "imagenverde"; } } catch (JSONException e) { // TODO Auto-generated catch block e.printStackTrace(); } } AlergenosProducto alerg = new AlergenosProducto(id, name, value); alergProd.add(alerg); } } @Override public int getCount() { if (null == jsonArray) return 0; else return jsonArray.length(); } @Override public JSONObject getItem(int position) { if (null == jsonArray) return null; else return jsonArray.optJSONObject(position); } @Override public long getItemId(int position) { JSONObject jsonObject = getItem(position); return jsonObject.optLong("id"); } @Override public View getView(int position, View convertView, ViewGroup parent) { if (convertView == null) convertView = activity.getLayoutInflater().inflate( R.layout.allergy_listitems, null); TextView text = (TextView) convertView.findViewById(R.id.secondLine); text.setText(alergProd.get(position).getAlergeno()); Log.i("value", alergProd.get(position).getAlergeno()); return convertView; } </code></pre> <p>Does anyone have a clue on how can i solve this?</p> <p>Thank you!</p> <p>EDIT:</p> <p>Added log cat.</p> <pre><code>09-05 00:23:18.217: E/AndroidRuntime(26828): FATAL EXCEPTION: main 09-05 00:23:18.217: E/AndroidRuntime(26828): java.lang.NullPointerException 09-05 00:23:18.217: E/AndroidRuntime(26828): at com.example.alood.Scan_Result$algResultados.onPostExecute(Scan_Result.java:230) 09-05 00:23:18.217: E/AndroidRuntime(26828): at com.example.alood.Scan_Result$algResultados.onPostExecute(Scan_Result.java:1) 09-05 00:23:18.217: E/AndroidRuntime(26828): at android.os.AsyncTask.finish(AsyncTask.java:631) 09-05 00:23:18.217: E/AndroidRuntime(26828): at android.os.AsyncTask.access$600(AsyncTask.java:177) 09-05 00:23:18.217: E/AndroidRuntime(26828): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:644) 09-05 00:23:18.217: E/AndroidRuntime(26828): at android.os.Handler.dispatchMessage(Handler.java:99) 09-05 00:23:18.217: E/AndroidRuntime(26828): at android.os.Looper.loop(Looper.java:137) 09-05 00:23:18.217: E/AndroidRuntime(26828): at android.app.ActivityThread.main(ActivityThread.java:4898) 09-05 00:23:18.217: E/AndroidRuntime(26828): at java.lang.reflect.Method.invokeNative(Native Method) 09-05 00:23:18.217: E/AndroidRuntime(26828): at java.lang.reflect.Method.invoke(Method.java:511) 09-05 00:23:18.217: E/AndroidRuntime(26828): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1006) 09-05 00:23:18.217: E/AndroidRuntime(26828): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:773) 09-05 00:23:18.217: E/AndroidRuntime(26828): at dalvik.system.NativeStart.main(Native Method) </code></pre> <p>Edited to add the hole asynctask:</p> <pre><code> public class algResultados extends AsyncTask&lt;Void, Void, String&gt; { HttpResponse response; BufferedReader reader; StringBuilder builder; String barcode; public algResultados(String data) { super(); this.barcode = data; } @Override protected String doInBackground(Void... arg0) { HttpClient httpClient = new DefaultHttpClient(); String logusuario = SaveSharedPreference .getUserName(getApplicationContext()); String logpass = SaveSharedPreference .getPassword(getApplicationContext()); // Petition get HttpGet httpGet = new HttpGet("http://www.alood.es/api/resultado/" + barcode + '/'); httpGet.addHeader(BasicScheme.authenticate( new UsernamePasswordCredentials(logusuario, logpass), "UTF-8", false)); // Execute Get and get Response response = null; try { response = httpClient.execute(httpGet); reader = new BufferedReader(new InputStreamReader(response .getEntity().getContent(), "UTF-8")); builder = new StringBuilder(); for (String line = null; (line = reader.readLine()) != null;) { builder.append(line).append("\n"); } } catch (Exception e) { e.printStackTrace(); alert("Error de protocolo", "Lo sentimos, ha ocurrido un error"); } // Return code (exit, fail, error, etc) return builder.toString(); } @Override protected void onPostExecute(String result) { String nombre = null; String fabricante = null; String barcode = null; String calorias = null; String fech = null; JSONArray jArray = null; Log.i("GET RESPONSE", "POSTTTTT"); Log.i("GET RESPONSE", result); JSONTokener tokener = new JSONTokener(result); try { String cca = ((JSONObject) tokener.nextValue()) .getString("valor"); Log.i("GET CCA", cca); JSONArray resparray = new JSONArray(cca); List&lt;AlergenosProducto&gt; objList = new ArrayList&lt;AlergenosProducto&gt;(); for (int i = 0; i &lt; resparray.length(); i++) { JSONObject respJSON = resparray.getJSONObject(i); nombre = respJSON.getString("nombre"); fabricante = respJSON.getString("fabricante"); String foto = respJSON.getString("foto"); calorias = respJSON.getString("calorias"); int puntos = respJSON.getInt("calorias"); barcode = respJSON.getString("barcode"); String fecha = respJSON.getJSONObject("revision").getString("date"); fech = fecha.substring(0, 10); jArray = respJSON.getJSONArray("alergenos"); for (int n = 0; n &lt; jArray.length(); n++) { JSONObject str_value = jArray.getJSONObject(n); String id = str_value.getString("id"); String name = str_value.getString("alergeno"); int value = str_value.getInt("valor"); Log.i("GET CCA", id); AlergenosProducto setAlerg = new AlergenosProducto(id, name, value); objList.add(setAlerg); } } TextView nombText = (TextView) findViewById(R.id.titleTxt); nombText.setText(nombre); TextView fabText = (TextView) findViewById(R.id.fabricanteTxt); fabText.setText("Fabricante: " + fabricante); TextView codText = (TextView) findViewById(R.id.codigoTxt); codText.setText("Código: " + barcode); TextView calText = (TextView) findViewById(R.id.caloriasTxt); calText.setText("Calorías: " + calorias + "Kcal"); TextView revisText = (TextView) findViewById(R.id.revisadoTxt); revisText.setText("Revisado: " + fech); listview = (ListView) findViewById(R.id.alProdList); AlergProdAdapter jSONAdapter = new AlergProdAdapter(Scan_Result.this, jArray); listview.setAdapter(jSONAdapter); //ArrayList&lt;AlergenosProducto&gt; alergenos = AlergProdAdapter.alergProd; } catch (JSONException e) { Log.i("EX", e.toString()); alert("Ups!", "Lo sentimos, pero no estás registrado como usuario"); } } } </code></pre>
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    1. USsoni
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    1. COI edited my question. Done
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      1. PODisplay a JSONArray with a JSONObject inside into an Android listview
      1. USsoni
    2. COlistview.setAdapter(jSONAdapter);
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      1. USsoni
    3. COlogcat says you're passing a null there ?
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      1. PODisplay a JSONArray with a JSONObject inside into an Android listview
      1. USHoward Pautz
 

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