Создание кастомного адаптера Android — ошибка

public class SampleListViewAdapterAllGroup extends BaseAdapter {
    public static Context context;
    ArrayList<String> data;
    public SampleListViewAdapterAllGroup(Context context) {
        this.context = context;
    }
    @Override
    public int getCount() {
        return data.size();
    }
    @Override
    public Object getItem(int position) {
        return data.get(position);
    }
    @Override
    public long getItemId(int position) {
        return 0;
    }

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        final View twoLineListItem;
        if (convertView == null) {
            LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            twoLineListItem = (View) inflater.inflate(com.akscorp.blueboard.R.layout.all_group_listview_space, null);
        } else {
            twoLineListItem = (View) convertView;
        }
        TextView tv = (TextView) twoLineListItem.findViewById(com.akscorp.blueboard.R.id.group_name);
        return twoLineListItem;
    }
    }

У вас неверный шаблон адаптера. Он должен наследоваться как выше. Выше и приведен шаблон адаптера

В вашем случае должно выглядеть примерно так

public class MyAdapter extends BaseAdapter {
    private List<MyList> list;
    public MyAdapter (Context context, List<MyList> list) {
        this.list = list;
    }

    @Override
    public int getCount() {
        return list.size();
    }
    @Override
    public Object getItem(int position) {
        return list.get(position);
    }
    @Override
    public long getItemId(int position) {
        return 0;
    }

    @Override
    public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
        LayoutInflater inflater = (LayoutInflater) context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = inflater.inflate(R.layout.list_layout,
                parent, false);
        TextView textView1 = (TextView) convertView.findViewById(R.id.textView1);
        TextView textView2 = (TextView) convertView.findViewById(R.id.textView2);
        TextView textView3 = (TextView) convertView.findViewById(R.id.textView3);
        TextView textView4 = (TextView) convertView.findViewById(R.id.textView4);
        MyList myList = list.get(position);
        textView1.setText(myList.getA1().toString());
        textView2.setText(myList.getA2().toString());
        textView3.setText(myList.getA3().toString());
        textView4.setText(myList.getA3().toString());
        return convertView;
    }
}

Ну и вызывать можно так

 listView.setAdapter(new MyAdapter(context));