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The document discusses ArrayAdapter methods for modifying and working with lists in Android. It lists methods for adding and removing items from the list, clearing the list, notifying of data changes, and getting items and positions. It also mentions abilities of ArrayAdapter like filtering and sorting the list. Questions at the end ask to explain the helper methods and provide an example for one method.
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- 1. Prof. Neeraj Bhargava Vishal Dutt Department of Computer Science, School of Engineering & System Sciences MDS University, Ajmer
- 3. Modifying Your List How do I add more items? How can I add a set of items? How do I clear all items?
- 4. ArrayAdapter Helper Methods add(T Object) – Adds the specified object to the end of the array. addAll(T… items) – Adds the specified items at the end of the array. clear() – Remove all elements from the list
- 5. ArrayAdapter Helper Methods notifyDataSetChanged() – notification that the underlying data has been changed and that the View should refresh itself. remove(T Object) – Removes the specified object from the array.
- 6. ArrayAdapter Helper Methods getItem(int position) – gets Object at specified position in adapter. getPosition(T item) – Returns the position of the specified item in the array.
- 7. ArrayAdapter Abilities Filtering – filter data by a certain constraint Only show data that begins with the letter “S.” Sorting – sort the contents of the adapter using a specified comparator. Sort by alpha A-Z, alpha Z-A, etc.
- 8. Questions Explain ArrayAdapter Helper methods? Explain any one Method with suitable example?