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POHow to parse Sub JSONArray and display image?
 

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  1. POHow to parse Sub JSONArray and display image?
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    <p>I am a php programmer and I am trying to learn JAVA. I have problem trying to parse a json file. It's been for 3 days..having a headache at this. I am create an android application (using JAVA) to parse json file. This is the sample json data (<a href="http://metalgearrisingguide.com/samplejson.json" rel="nofollow">http://metalgearrisingguide.com/samplejson.json</a>) And how to display the image?</p> <p>When i tried, I have the following error at my logcat and nothing is displayed on the emulator</p> <pre><code>Error parsing data org.json.JSONException: Value {"product":[{"summary":"Speak a word and the knob will turn by itself","state":"good","image":"http:\/\/upload.wikimedia.org\/wikipedia\/commons\/e\/e9\/Door_Knob_with_Lock_USA.jpg","title":"Special Door knob requires no holding just music","address":[{"address":"Merchant address 1"},{"address":"merchant address 2"}],"url":"http:\/\/merchantwebsite.com"},{"summary":"This door bell will detect faces of known people and change music if unknown","state":"good","image":"http:\/\/www.thedoorbell.net\/images\/DoorbellHeader.jpg","title":"Special Door Bell that uses face recognition technology","address":[{"address":"Merchant address 1"},{"address":"merchant address 2"}],"url":"http:\/\/merchantwebsite2.com"},{"summary":"Can't wake up in the morning?\r\nWill you be awake for party? Listen to your favourite song that will awake you!","state":"refurnished","image":"http:\/\/jgrundig.wpengine.netdna-cdn.com\/wp-content\/uploads\/2011\/08\/RCA-Alarm-Clock-with-Charging-Cord-RC107.jpg","title":"The only alarm clock that plays your favourite song from your smartphone","address":[{"address":"Merchant address 1"},{"address":"merchant address 2"}],"url":"http:\/\/merchantwebsite3.com"}],"site":{"sitename":"Simple Product Find","imgprefix":"http:\/\/mydomain.com\/","urlprefix":"http:\/\/mydomain.com\/"}} at data of type org.json.JSONObject cannot be converted to JSONArray </code></pre> <p>Here is my JSONfunctions class:</p> <pre><code>public class JSONfunctions { public static JSONObject getJSONfromURL(String url){ InputStream is = null; String result = ""; JSONObject jArray = null; //http post try{ HttpClient httpclient = new DefaultHttpClient(); HttpPost httppost = new HttpPost(url); 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); 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.e("log_tag", "Error converting result "+e.toString()); } try{ jArray = new JSONObject(result); }catch(JSONException e){ Log.e("log_tag", "Error parsing data "+e.toString()); } return jArray; //return result; } } </code></pre> <p>And here is my code:</p> <pre><code>public class Main extends ListActivity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.listplaceholder); ArrayList&lt;HashMap&lt;String, String&gt;&gt; mylist = new ArrayList&lt;HashMap&lt;String, String&gt;&gt;(); JSONObject json = JSONfunctions.getJSONfromURL("http://metalgearrisingguide.com/samplejson.json"); try{ JSONArray data = json.getJSONArray("data"); JSONArray products = data.getJSONArray(1); for(int i=0;i&lt;products.length();i++){ HashMap&lt;String, String&gt; map = new HashMap&lt;String, String&gt;(); JSONObject e = products.getJSONObject(i); map.put("id", String.valueOf(i)); map.put("title", "Product name:" + e.getString("title")); map.put("state", "Condition:" + e.getString("state")); map.put("summary", "Description: " + e.getString("summary")); mylist.add(map); Set set = map.entrySet(); // Get an iterator Iterator o = set.iterator(); // Display elements while(o.hasNext()) { Map.Entry me = (Map.Entry)o.next(); System.out.print(me.getKey() + ": "); System.out.println(me.getValue()); } System.out.println(); } }catch(JSONException e) { Log.e("log_tag", "Error parsing data "+e.toString()); } ListAdapter adapter = new SimpleAdapter(this, mylist , R.layout.main, new String[] { "state", "summary" }, new int[] { R.id.item_title, R.id.item_subtitle }); setListAdapter(adapter); final ListView lv = getListView(); lv.setTextFilterEnabled(true); lv.setOnItemClickListener(new OnItemClickListener() { public void onItemClick(AdapterView&lt;?&gt; parent, View view, int position, long id) { @SuppressWarnings("unchecked") HashMap&lt;String, String&gt; o = (HashMap&lt;String, String&gt;) lv.getItemAtPosition(position); Toast.makeText(Main.this, "ID '" + o.get("id") + "' was clicked.", Toast.LENGTH_SHORT).show(); } }); } } </code></pre>
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    1. COto display image from web in ListView you will need to create Custom Adapter instead of Default
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    2. COhow about the 'title' and 'summary' data? Those 2 datas are also not displaying.. or is there something wrong with my JSON file? But it's validated by http://jsonlint.com and it's fine.
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