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POsort JSONArray without Gson, Jackson, etc
 

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  1. POsort JSONArray without Gson, Jackson, etc
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    <p>In my app, the class below receives a JSONArray and use its data to populate a ListView. I want the fields in this ListView to appear in an Alphabetical order. So I want to sort my JSONArray before using its data.</p> <p>I've saw some topics suggesting to use GSON or Jackson, but I'm trying to do this in a simpler way. I don't understand well these libraries and did't find what I need in their tutorials.</p> <p>An example of the JSON:</p> <pre><code>{"0":["1","Alimentos e Bebidas","Y"],"1":["6","Beleza e Cosm\u00e9ticos","Y"],"2": ["11","Cama, Mesa e Banho","Y"],"3":["3","CDs, DVDs e Games","Y"],"4":["2","Convites e Cortesias","Y"],"5":["23","Cursos","Y"],"6":["8","Eletr\u00f4nicos","Y"],"7": ["16","Esporte e Lazer","Y"],"8":["14","Inform\u00e1tica e Acess\u00f3rios","Y"], "9":["10","Limpeza","Y"],"10":["4","Livros","Y"],"11":["21","Livros no Sebo","Y"], "12":["5","Outros","Y"],"13":["12","Roupas e Acess\u00f3rios","Y"]} </code></pre> <p>The class' method where I populate the list and wait for user:</p> <pre><code>public void proccess(){ listview = (ListView) findViewById(R.id.include3); int qtdCategorias = json.length(); categorias = new String[qtdCategorias]; itens = new ArrayList&lt;ItemListView&gt;(); for (int i=0; i&lt;qtdCategorias; i++){ c = json.optJSONArray(i); String nomeCategoria = null; try { nomeCategoria = c.getString(1); //A consulta SQL do php retorna somente categorias habilitadas } catch (JSONException e) { Log.e("CategoriasShoppingActivity", e.toString()); e.printStackTrace(); } categorias[i] = nomeCategoria; //ItemListView item = new ItemListView(nomeCategoria); //itens.add(item); } Arrays.sort(categorias); for (int i=0; i&lt;qtdCategorias; i++){ ItemListView item = new ItemListView(categorias[i]); itens.add(item); } adapterListView = new AdapterListView(this, itens); listview.setAdapter(adapterListView); listview.setOnItemClickListener(new OnItemClickListener() { public void onItemClick(AdapterView&lt;?&gt; parent, View v, int position, long id) { c = json.optJSONArray(position); String name = null; String idt = null; try { name = c.getString(1); idt = c.getString(0); } catch (JSONException e) { // TODO Auto-generated catch block e.printStackTrace(); } Intent in = new Intent(getApplicationContext(), ProdutosActivity.class); in.putExtra(TAG_NAME, name); in.putExtra(TAG_ID, idt); startActivity(in); } }); } </code></pre> <p>[EDIT] To request data from server, I use this JSONParser class ():</p> <pre><code>public class JSONParser{ static InputStream is = null; static JSONArray jArr = null; static JSONStringer jArrString = null; static String json = ""; private static Context context; private ProgressDialog loader; // static HttpEntity httpEntity = null; // constructor public JSONParser() { } public JSONArray getJSONFromUrl(String url, List&lt;NameValuePair&gt; params) { // Making HTTP request try { // defaultHttpClient HttpClient httpClient = new DefaultHttpClient(); HttpPost httpPost = new HttpPost(url); httpPost.setEntity(new UrlEncodedFormEntity(params)); HttpResponse httpResponse = httpClient.execute(httpPost); HttpEntity httpEntity = httpResponse.getEntity(); // json = EntityUtils.toString(httpEntity); // HttpEntity httpEntity2 = httpEntity; json = EntityUtils.toString(httpEntity); // is = httpEntity.getContent(); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } catch (ClientProtocolException e) { e.printStackTrace(); } catch (IOException e) { Log.e("JSONParser", "IOException "+e.toString()); e.printStackTrace(); } try { char[] c = new char[json.length()]; json.getChars(0, json.length(), c, 0); int i = 0; while (c[i] == '\u00EF' || c[i] == '\u00BB' || c[i] == '\u00BF') { // remove // utf-8 // BOM i++; } json = json.substring(i); Log.e("JSON", json); } catch (Exception e) { Log.e("Buffer Error", "Error converting result " + e.toString()); } // try parse the string to a JSON object try { JSONObject json_data = new JSONObject(json); JSONArray hashMap_names = json_data.names(); JSONArray hashMap_names2 = new JSONArray(); Map hashMap = new HashMap(json_data.length()); for (int i = 0; i != hashMap_names.length(); i++) { hashMap.put(String.valueOf(i), json_data.get(String.valueOf(i))); hashMap_names2.put(String.valueOf(i)); } JSONObject hashMap_obj = new JSONObject(hashMap); jArr = hashMap_obj.toJSONArray(hashMap_names2); // jArr = new JSONArray(json); Log.e("JSON Parser", "succesful parsing data " + jArr.toString()); } catch (Exception e) { Log.e("JSON Parser", "Error parsing data " + e.toString()); jArr = null; } // return JSON String return jArr; } </code></pre> <p>And here I receive the JSON in my class</p> <pre><code>protected void onActivityResult(int requestCode, int resultCode, Intent data){ if (requestCode == 1){ if (resultCode == RESULT_OK){ try { json = new JSONArray(data.getStringExtra(TAG_JSON)); Log.e("CategoriasShoppingActivity", "JSON: "+json); } catch (JSONException e) { e.printStackTrace(); } proccess(); }else{ // resultCode == RESULT_CANCELED Log.d("CategoriasJogarActivity", "AsyncTaskActicity retornou RESULT_CANCELED"); finish(); } } } </code></pre>
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