Android Custom ArrayAdapter With Custom Object

I am new for Android development. I was trying to implement a custom ArrayAdapter to accept custom object in Android Studio. I have referenced the source code from some tutorial,

Solution 1:

Here is working adapter code

public class RowAdapter extends ArrayAdapter<Row> {

    private final Activity _context;
    private final ArrayList<Row> rows;

    public class ViewHolder
    {
        EditText RowNo;
        EditText RowText;
    }

    public RowAdapter(Activity context, ArrayList<Row> rows)
    {
        super(context,R.layout.row_layout, R.id.row_id ,rows);
        this._context = context;
        this.rows = rows;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent){
        ViewHolder holder = null;

        if(convertView == null)
        {
            LayoutInflater inflater = _context.getLayoutInflater();
            convertView = inflater.inflate(R.layout.row_layout,parent,false);

            holder = new ViewHolder();
            holder.RowNo = (EditText)convertView.findViewById(R.id.row_no);
            holder.RowText = (EditText)convertView.findViewById(R.id.row_text);

            convertView.setTag(holder);
        }
        else
        {
            holder = (ViewHolder) convertView.getTag();
        }

        holder.RowNo.setText(""+rows.get(position).RowNo);
        holder.RowText.setText(rows.get(position).RowText);

        return convertView;
    }
}

Your getting exception at holder.RowNo.setText(rows.get(position).RowNo);

so replace it with
holder.RowNo.setText(""+rows.get(position).RowNo);

Solution 2:

Change with below code:-

RowAdapter.java

 public class RowAdapter extends BaseAdapter {
    
        private final Context _context;
        private final ArrayList<Row> rows;
    
        public RowAdapter(Context context, ArrayList<Row> rows)
        {
            this._context = context;
            this.rows = rows;
        }
    
          @Override
          public int getCount() {
              return rows.size();
          }
    
          @Override
          public Object getItem(int position) {
              return rows;
          }
    
          @Override
          public long getItemId(int position) {
              return position;
          }
    
        public View getView(int position, View convertView, ViewGroup parent){
    
               LayoutInflater inflater = (LayoutInflater) _context
                  .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    
               View rowView=inflater.inflate(R.layout.row_layout, null,true);
                
               EditText RowNo = (EditText) rowView.findViewById(R.id.row_no);
               EditText RowText = (EditText) rowView.findViewById(R.id.row_text);
    
               RowNo.setText(rows.get(position).RowNo);
               RowText.setText(rows.get(position).RowText);
    
            return rowView;
        }
    }

Solution 3:

public View getView (int position, View convertView, ViewGroup parent)

This method is called to get view object. In your code there is GetView, not getView

Solution 4:

change your

public View GetView(int position, View convertView, ViewGroup parent)

with

@Override

public View getView(int position, View convertView, ViewGroup parent)

and

holder.RowNo.setText(rows.get(position).RowNo);

with

holder.RowNo.setText(""+rows.get(position).RowNo);