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POHow to Display json array to listview with AsyncTask?
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  1. POHow to Display json array to listview with AsyncTask?
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    copied!<p>Hello I am new for the android,so please let me know where I am wrong.</p> <p>I want convert the jsonarray into custom listview.I tried much but I don't get the solution. I got the value that I want into strValue1(please check the below code ,Activites_Activity.java). Now ,I want to pass this strValue1 into the listview. but I am not able to convert it into listview. </p> <p>so Please let me know what i should do?</p> <p>I got the error</p> <pre><code>04-17 12:52:55.795: E/AndroidRuntime(765): FATAL EXCEPTION: AsyncTask #1 04-17 12:52:55.795: E/AndroidRuntime(765): java.lang.RuntimeException: An error occured while executing doInBackground() 04-17 12:52:55.795: E/AndroidRuntime(765): at android.os.AsyncTask$3.done(AsyncTask.java:200) 04-17 12:52:55.795: E/AndroidRuntime(765): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273) 04-17 12:52:55.795: E/AndroidRuntime(765): at java.util.concurrent.FutureTask.setException(FutureTask.java:124) 04-17 12:52:55.795: E/AndroidRuntime(765): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307) 04-17 12:52:55.795: E/AndroidRuntime(765): at java.util.concurrent.FutureTask.run(FutureTask.java:137) 04-17 12:52:55.795: E/AndroidRuntime(765): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1068) 04-17 12:52:55.795: E/AndroidRuntime(765): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:561) 04-17 12:52:55.795: E/AndroidRuntime(765): at java.lang.Thread.run(Thread.java:1096) 04-17 12:52:55.795: E/AndroidRuntime(765): Caused by: android.view.ViewRoot$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views. 04-17 12:52:55.795: E/AndroidRuntime(765): at android.view.ViewRoot.checkThread(ViewRoot.java:2802) 04-17 12:52:55.795: E/AndroidRuntime(765): at android.view.ViewRoot.focusableViewAvailable(ViewRoot.java:1596) 04-17 12:52:55.795: E/AndroidRuntime(765): at android.view.ViewGroup.focusableViewAvailable(ViewGroup.java:451) 04-17 12:52:55.795: E/AndroidRuntime(765): at android.view.ViewGroup.focusableViewAvailable(ViewGroup.java:451) 04-17 12:52:55.795: E/AndroidRuntime(765): at android.view.ViewGroup.focusableViewAvailable(ViewGroup.java:451) 04-17 12:52:55.795: E/AndroidRuntime(765): at android.view.ViewGroup.focusableViewAvailable(ViewGroup.java:451) 04-17 12:52:55.795: E/AndroidRuntime(765): at android.view.View.setFlags(View.java:4474) 04-17 12:52:55.795: E/AndroidRuntime(765): at android.view.View.setFocusableInTouchMode(View.java:3104) 04-17 12:52:55.795: E/AndroidRuntime(765): at android.widget.AdapterView.checkFocus(AdapterView.java:694) 04-17 12:52:55.795: E/AndroidRuntime(765): at android.widget.ListView.setAdapter(ListView.java:437) 04-17 12:52:55.795: E/AndroidRuntime(765): at com.rahul.cheerfoolz.activites.Activites_Activity$activites.doInBackground(Activites_Activity.java:141) 04-17 12:52:55.795: E/AndroidRuntime(765): at com.rahul.cheerfoolz.activites.Activites_Activity$activites.doInBackground(Activites_Activity.java:1) 04-17 12:52:55.795: E/AndroidRuntime(765): at android.os.AsyncTask$2.call(AsyncTask.java:185) 04-17 12:52:55.795: E/AndroidRuntime(765): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305) 04-17 12:52:55.795: E/AndroidRuntime(765): ... 4 more </code></pre> <p>Thanks.</p> <p>Activites_Activity.java</p> <pre><code>public class Activites_Activity extends CheerfoolznativeActivity { TextView txtactivity; ListView list; LazyAdapter adapter; ImageView img; ProgressBar pgb; protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_activites); setHeader("Activites"); /* list=(ListView)findViewById(R.id.activity_listView); adapter=new LazyAdapter(this, mImages,mTitle); list.setAdapter(adapter); */ txtactivity = (TextView) findViewById(R.id.activity_textView); img=(ImageView)findViewById(R.id.activity_image); pgb = (ProgressBar)findViewById(R.id.activity_progressBar); new activites().execute(); } public class activites extends AsyncTask&lt;Void, Void, Void&gt; { String parsedString = "\n"; String strValue1 ; public int i=0; @Override protected void onPreExecute() { // TODO Auto-generated method stub super.onPreExecute(); pgb.setVisibility(View.VISIBLE); } @Override protected Void doInBackground(Void... params) { // TODO Auto-generated method stub String url = " Here my json URL "; String strResponse = util.makeWebCall(url); try { JSONObject objResponse = new JSONObject(strResponse); JSONArray jsonnodes = objResponse.getJSONArray(API.cheerfoolz_activities.NODES); Log.i(" NO of entries===&gt;" +Activites_Activity.class.getName(),"Number of entries " + jsonnodes.length()); ArrayList&lt;String&gt; items = new ArrayList&lt;String&gt;(); for (i = 0; i &lt; jsonnodes.length(); i++) { String str = Integer.toString(i); Log.i("Value of i",str); JSONObject jsonnode = jsonnodes.getJSONObject(i); JSONObject jsonnodevalue = jsonnode.getJSONObject(API.cheerfoolz_activities.NODE); strValue1 = jsonnodevalue.getString(API.cheerfoolz_activities.TITLE); Log.i("JSONArray", strValue1); //parsedString += " \n\n Value of stored parse : =&gt; " + strValue1; parsedString = parsedString.trim(); //this will remove the blank white space items.add(strValue1); parsedString += " \n Value added in list =&gt; " + items; Log.i("Value of items : ", parsedString); } //List&lt;String&gt; list = Arrays.asList((String[])jsonnodes.toString()); //String[] values= new String[]{items.toString()}; //myListView.setListAdapter( /* list=(ListView)findViewById(R.id.activity_listView); // adapter=new LazyAdapter((Activity) getApplicationContext(), mImages,mTitle); list.setAdapter(adapter);*/ ListView myListView = (ListView)findViewById(R.id.activity_listView); myListView.setAdapter(new ArrayAdapter(getApplicationContext(), android.R.layout.simple_expandable_list_item_1, items)); // ArrayAdapter&lt;String&gt; adapter= new ArrayAdapter&lt;String&gt;(Activites_Activity.this, android.R.layout.simple_list_item_1,items); // myListView.setAdapter(adapter); //Log.i("contact", items1 ); } catch (JSONException e) { e.printStackTrace(); txtactivity.setText(e.getMessage()); } return null; } @Override protected void onProgressUpdate(Void... values) { // TODO Auto-generated method stub super.onProgressUpdate(values); } @Override public void onPostExecute(Void result) { // TODO Auto-generated method stub super.onPostExecute(result); txtactivity.setText(parsedString); pgb.setVisibility(View.GONE); //img.setImageResource(parsedString); } } } </code></pre> <p>LazyAdapter.java</p> <pre><code>public class LazyAdapter extends BaseAdapter{ private Activity context; private String[] title; private String[] images; private LayoutInflater inflater; public LazyAdapter(Activity context,String[] img ,String[] title) { super(); this.context = context; this.title = title; this.images = img; this.inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); } @Override public int getCount() { // TODO Auto-generated method stub return title.length; } @Override public Object getItem(int position) { // TODO Auto-generated method stub return null; } @Override public long getItemId(int position) { // TODO Auto-generated method stub return 0; } public static class ViewHolder { ImageView imgViewLogo; TextView txtViewTitle; } @Override public View getView(int position, View convertView, ViewGroup parent) { // TODO Auto-generated method stub ViewHolder holder; if(convertView==null) { holder = new ViewHolder(); convertView = inflater.inflate(R.layout.activity_listitem, null); holder.imgViewLogo = (ImageView) convertView.findViewById(R.id.activity_list_logo); holder.txtViewTitle = (TextView) convertView.findViewById(R.id.activity_list_title); convertView.setTag(holder); } else holder=(ViewHolder)convertView.getTag(); // holder.imgViewLogo.setImageResource(images[position]); holder.txtViewTitle.setText(title[position]); return convertView; } } </code></pre> <p>makeWebCall.class</p> <pre><code>public static String makeWebCall(String url) { DefaultHttpClient client = new DefaultHttpClient(); HttpGet httpRequest = new HttpGet(url); try { HttpResponse httpResponse = client.execute(httpRequest); final int statusCode = httpResponse.getStatusLine().getStatusCode(); if (statusCode != HttpStatus.SC_OK) { /* Log.i(getClass().getSimpleName(), "Error =&gt; " + statusCode + " =&gt; for URL " + url);*/ return null; } HttpEntity entity = httpResponse.getEntity(); InputStream is = entity.getContent(); return iStream_to_String(is); } catch (IOException e) { httpRequest.abort(); // Log.w(getClass().getSimpleName(), "Error for URL =&gt;" + url, e); } return null; } public static String iStream_to_String(InputStream is1) { BufferedReader rd = new BufferedReader(new InputStreamReader(is1), 4096); String line; StringBuilder sb = new StringBuilder(); try { while ((line = rd.readLine()) != null) { sb.append(line); } rd.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } String contentOfMyInputStream = sb.toString(); return contentOfMyInputStream; } </code></pre>
 

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