Custom Adapter

public class MyAdapter extends ArrayAdapter<MyData> {
 private Context context;
 private int resource;
 private MyData[] objects;
 private int resTitle;
 private int resNumber;

 public MyAdapter(Context context,
                  int resource,
                  MyData[] objects) {
  super(context, resource, objects);
  this.context = context;
  this.resource = resource;
  this.objects = objects;
  this.resTitle =R.id.title;
  this.resNumber =R.id.number;
 }

 public MyAdapter(Context context,
                  int resource,
                  int resTitle,
                  int resNumber,
                  MyData[] objects) {
  super(context, resource, objects);
  this.context = context;
  this.resource = resource;
  this.resTitle = resTitle;
  this.resNumber = resNumber;
  this.objects = objects;
 }

 private static class ViewHolder {
  TextView title;
  TextView number;
 }

 @Override
 public View getView(int position,
                     View convertView,
                     ViewGroup parent) {
  View row;
  ViewHolder viewHolder;
  if (convertView == null) {
   viewHolder = new ViewHolder();
   LayoutInflater inflater =
       ((Activity) context).getLayoutInflater();
   row = inflater.inflate(resource,
                          parent,
                          false);
   viewHolder.title =
          (TextView) row.findViewById(resTitle);
   viewHolder.number =
          (TextView) row.findViewById(resNumber);
   row.setTag(viewHolder);
  } else {
   row = convertView;
   viewHolder =
         (ViewHolder) convertView.getTag();
  }
  viewHolder.title.setText((CharSequence)
                     objects[position].myTitle);
  viewHolder.number.setText(Integer.toString(
                     objects[position].myNum));
  return row;
 }
}

You can download the code for the programs from the CodeBin (note you have to register first).

Android Programming In Java:
Starting With an App
Third Edition

Is now available in paperback and ebook.

Available from Amazon.

1. Getting Started With Android Studio 3
2. The Activity And The UI
3. Building The UI and a Calculator App
4. Android Events
        Extract: Using Lambdas
5. Basic Controls
6. Layout Containers
7. The ConstraintLayout
       Extract: Guidelines and Barriers
8. UI Graphics A Deep Dive
       Extract: Programming the UI ***NEW
9. Menus & The Action Bar
10. Menus, Context & Popup
11. Resources
12. Beginning Bitmap Graphics
        Extract: Simple Animation
13. Staying Alive! Lifecycle & State
14. Spinners
15. Pickers
16. ListView And Adapters

If you are interested in creating custom template also see:

Custom Projects In Android Studio

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setContentView(R.layout.activity_main);