Question

Hello I am new for the android,so please let me know where I am wrong.

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.

so Please let me know what i should do?

I got the error

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

Thanks.

Activites_Activity.java

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<Void, Void, Void> {
    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===>" +Activites_Activity.class.getName(),"Number of entries " + jsonnodes.length());

            ArrayList<String> items = new ArrayList<String>();

            for (i = 0; i < 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 :  => " + strValue1;
                parsedString = parsedString.trim(); //this will remove the blank white space

                items.add(strValue1);

                parsedString += " \n Value added in list  => " + items;

                Log.i("Value of items : ", parsedString);



            }


            //List<String> 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<String> adapter= new ArrayAdapter<String>(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);
    }
}

}

LazyAdapter.java

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;  
}   

}

makeWebCall.class

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 => " + statusCode + " => 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 =>" + 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;
}

Answer 1

Assuming your ListView modifications are right, then move this code:

ListView myListView = (ListView)findViewById(R.id.activity_listView);
            myListView.setAdapter(new ArrayAdapter(getApplicationContext(), android.R.layout.simple_expandable_list_item_1, items));

from the AsyncTask‘s doInBackground method into the onPostExecute function. You can’t modify any Views from inside doInBackground, you must do it in one of the callback functions that are guaranteed to be run on the event dispatch thread.