All the adapter views such as ListView and GridView use an Adapter that acts as a bridge between the data and views. The Adapter iterates through the content and generates Views for each data item in the list.

The Android SDK provides three different adapter implementations such as ArrayAdapter, CursorAdapter, and SimpleAdapter. An ArrayAdapter expects an array or a list as input, while CursorAdapter accepts the instance of the Cursor, and SimpleAdapter maps the static data defined in the resources. The type of adapter that suits your app need is purely based on the input data type.

The BaseAdapter is the generic implementation for all of the three adapter types, and it implements the IListAdapter, ISpinnerAdapter, and IDisposable interfaces. This means that the BaseAdapter can be used for ListView, GridView, or Spinners.

For POIApp, we will create a subtype of BaseAdapter<T> as it meets our specific needs, works well in many scenarios, and allows the use...