Custom ArrayAdapter in ListFragment error

Question

I get an error when I try to run the code for my app after trying to add a list view using a custom ArrayAdapter in a class derived from ListFragment.

Logcat:

09-12 02:21:27.818  31354-31354/com.example.anas.myapplication E/AndroidRuntime﹕ FATAL EXCEPTION: main
    Process: com.example.anas.myapplication, PID: 31354
    java.lang.NullPointerException
            at com.example.anas.myapplication.adapter.MaalomaListAdapter.getView(MaalomaListAdapter.java:74)

The error is produced in the following line the method getView():

viewHolder.ivMaaloma.setImageResource(R.drawable.maaloma_bg_1); 
viewHolder.tvMaaloma.setText(maaloma.getText());

To get a clearer idea of what I'm trying to do, this is my custom ArrayAdapter class (I marked error line with a comment):

MaalomaListAdapter.java:

public class MaalomaListAdapter extends ArrayAdapter<Maaloma> {

    private Context context;
    private int resource;
    private List<Maaloma> maalomaList;

    public MaalomaListAdapter(Context context, int resource, List<Maaloma> maalomaList) {
        super(context, resource, maalomaList);

        this.context = context;
        this.resource = resource;
        this.maalomaList = maalomaList;
    }

    public static int getResId(String resName, Class<?> c) {

        try {
            Field idField = c.getDeclaredField(resName);
            return idField.getInt(idField);
        } catch (Exception e) {
            e.printStackTrace();
            return -1;
        }
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        ViewHolder viewHolder;

        if(convertView == null) {
            // inflate item layout
            LayoutInflater inflater = ((Activity) this.context).getLayoutInflater();
            convertView = inflater.inflate(this.resource, parent, false);

            // init view holder
            viewHolder = new ViewHolder();
            viewHolder.ivMaaloma = (ImageView) convertView.findViewById(R.id.iv_maaloma_bg);
            viewHolder.tvMaaloma = (TextView) convertView.findViewById(R.id.tv_maaloma);

            convertView.setTag(viewHolder);
        } else {
            // recycling already inflated views
            viewHolder = (ViewHolder) convertView.getTag();
        }

        Maaloma maaloma = maalomaList.get(position);

        //int imageResId = getResId(maaloma.getImage(), Drawable.class);

        /**** ERROR COMES FROM THE FOLLOWING TWO LINES (WHICHEVER WAS FIRST) *****/
        viewHolder.ivMaaloma.setImageResource(R.drawable.maaloma_bg_1); 
        viewHolder.tvMaaloma.setText(maaloma.getText());

        return convertView;

    }

    private static class ViewHolder {
        private ImageView ivMaaloma;
        private TextView tvMaaloma;

    }
}

I suppose the error resides in this class only but I'm ready to post more code upon request. Appreciate the time and effort guys.

check the id's of views in layout file... i think they are not exist there.. — Sourabh Bans
– Sourabh Bans, Commented Sep 12, 2015 at 8:03
@skywall it's this one viewHolder.ivMaaloma.setImageResource(R.drawable.maaloma_bg_1). I marked it with an all caps /* */ comment in the class code. (Out of topic: If there's a trick I can use on SO for that you could let me know please) — siriuseteor77
– siriuseteor77, Commented Sep 12, 2015 at 14:16
They're there @sourabhbans, I used the wrong XML file in my ListFragment. — siriuseteor77
– siriuseteor77, Commented Sep 12, 2015 at 14:23

Derek Fung · Accepted Answer · 2015-09-12 05:35:46Z

1

What is the layout you using during error?

It is likely that the layout you used do not have R.id.iv_maaloma_bg or R.id.tv_maaloma

answered Sep 12, 2015 at 5:35

Derek Fung

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1 Comment

siriuseteor77 Over a year ago

They're there, I just used the wrong XML file as a resource in my ListFragment.

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