How to load images in BaseAdapter from JSON in Android

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I have created a custom list containing TextView, ImageView and Button. Now I am trying to display Images from the JSON url but when I run my code I receive a NullPointerException. I don't know why I am getting this Error because the TextView and Button are displaying their respective Informations.

Following is the code of BaseAdapter:

public class SearchAdapter extends BaseAdapter {

    Context context;
    LayoutInflater inflater;
    View vw;
    ArrayList<String> unameList = new ArrayList<String>();
    ArrayList<String> statusList = new ArrayList<String>();
    ArrayList<String> uidList = new ArrayList<String>();
    ArrayList<String> picList = new ArrayList<String>();
    String id, message, url;
    boolean status;
    ConnectionStatus cs;

    public SearchAdapter(Context context, LayoutInflater inflater, ArrayList<String> list1, ArrayList<String> list2,
            ArrayList<String> list3, ArrayList<String> list4, String id) {
        // TODO Auto-generated constructor stub
        this.context = context;
        this.inflater = inflater;
        unameList.clear();
        statusList.clear();
        uidList.clear();
        picList.clear();
        unameList = list1;
        statusList = list2;
        uidList = list3;
        picList = list4;
        Log.v("srch", String.valueOf(picList));
        this.id = id;
    }

    public int getCount() {
        // TODO Auto-generated method stub
        return unameList.size();
    }

    public Object getItem(int position) {
        // TODO Auto-generated method stub
        return position;
    }

    public long getItemId(int position) {
        // TODO Auto-generated method stub
        return 0;
    }
    private class ViewHolder {
        ImageView img;
        TextView tv;
        Button btn;
    }
    public View getView(final int position, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub
        final ViewHolder holder;
        if(convertView == null)
        {
            convertView = inflater.inflate(R.layout.list_items, null);
            holder = new ViewHolder();
            holder.img = (ImageView)convertView.findViewById(R.id.imageView1);
            holder.tv = (TextView)convertView.findViewById(R.id.textView1);
            holder.btn = (Button)convertView.findViewById(R.id.button1);
        }
        else
        {
            holder = (ViewHolder)convertView.getTag();
        }
        if(picList.get(position).startsWith("http:"))
        {
            try
            {
                URL url = new URL(picList.get(position));
                Log.v("url", url.toString());
                URLConnection conn = url.openConnection();
                conn.connect();
                InputStream is = conn.getInputStream();
                BufferedInputStream bis = new BufferedInputStream(is);
                Bitmap bm = BitmapFactory.decodeStream(bis);
                holder.img.setImageBitmap(bm);
                bis.close();
                is.close();
            }
            catch (IOException e)
            {
                e.printStackTrace();
                Log.e("Exception",e.getMessage());
            }
        }
        holder.tv.setText(unameList.get(position));
        if(statusList.get(position).contains("1"))
        {
            holder.btn.setText("listening");
        }
        else
        {
            holder.btn.setText("listen");
        }
        return convertView;
    }
}

LogCat:

09-26 14:13:34.294: E/AndroidRuntime(1376): FATAL EXCEPTION: main
09-26 14:13:34.294: E/AndroidRuntime(1376): java.lang.NullPointerException
09-26 14:13:34.294: E/AndroidRuntime(1376):     at com.pnf.flutterr.SearchAdapter.getView(SearchAdapter.java:105)
09-26 14:13:34.294: E/AndroidRuntime(1376):     at android.widget.AbsListView.obtainView(AbsListView.java:1315)
09-26 14:13:34.294: E/AndroidRuntime(1376):     at android.widget.ListView.makeAndAddView(ListView.java:1727)
09-26 14:13:34.294: E/AndroidRuntime(1376):     at android.widget.ListView.fillDown(ListView.java:652)
09-26 14:13:34.294: E/AndroidRuntime(1376):     at android.widget.ListView.fillFromTop(ListView.java:709)
09-26 14:13:34.294: E/AndroidRuntime(1376):     at android.widget.ListView.layoutChildren(ListView.java:1580)
09-26 14:13:34.294: E/AndroidRuntime(1376):     at android.widget.AbsListView.onLayout(AbsListView.java:1147)
09-26 14:13:34.294: E/AndroidRuntime(1376):     at android.view.View.layout(View.java:7035)
09-26 14:13:34.294: E/AndroidRuntime(1376):     at android.widget.RelativeLayout.onLayout(RelativeLayout.java:909)
09-26 14:13:34.294: E/AndroidRuntime(1376):     at android.view.View.layout(View.java:7035)
09-26 14:13:34.294: E/AndroidRuntime(1376):     at android.widget.FrameLayout.onLayout(FrameLayout.java:333)
09-26 14:13:34.294: E/AndroidRuntime(1376):     at android.view.View.layout(View.java:7035)
09-26 14:13:34.294: E/AndroidRuntime(1376):     at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1249)
09-26 14:13:34.294: E/AndroidRuntime(1376):     at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1125)
09-26 14:13:34.294: E/AndroidRuntime(1376):     at android.widget.LinearLayout.onLayout(LinearLayout.java:1042)
09-26 14:13:34.294: E/AndroidRuntime(1376):     at android.view.View.layout(View.java:7035)
09-26 14:13:34.294: E/AndroidRuntime(1376):     at android.widget.FrameLayout.onLayout(FrameLayout.java:333)
09-26 14:13:34.294: E/AndroidRuntime(1376):     at android.view.View.layout(View.java:7035)
09-26 14:13:34.294: E/AndroidRuntime(1376):     at android.view.ViewRoot.performTraversals(ViewRoot.java:1045)
09-26 14:13:34.294: E/AndroidRuntime(1376):     at android.view.ViewRoot.handleMessage(ViewRoot.java:1727)
09-26 14:13:34.294: E/AndroidRuntime(1376):     at android.os.Handler.dispatchMessage(Handler.java:99)
09-26 14:13:34.294: E/AndroidRuntime(1376):     at android.os.Looper.loop(Looper.java:123)
09-26 14:13:34.294: E/AndroidRuntime(1376):     at android.app.ActivityThread.main(ActivityThread.java:4627)
09-26 14:13:34.294: E/AndroidRuntime(1376):     at java.lang.reflect.Method.invokeNative(Native Method)
09-26 14:13:34.294: E/AndroidRuntime(1376):     at java.lang.reflect.Method.invoke(Method.java:521)
09-26 14:13:34.294: E/AndroidRuntime(1376):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
09-26 14:13:34.294: E/AndroidRuntime(1376):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
09-26 14:13:34.294: E/AndroidRuntime(1376):     at dalvik.system.NativeStart.main(Native Method)

Instead if picList.get(position) you can try this link:

http://abhishekpnf.my3gb.com/test/uploads/180px-Lamborghini_Logo.svg.png

Please help me in finding the solution..

Thanks in Advance..

Do you know whats causing the NullPointer? Is it the view or something in the code that doing the download?

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