List view1
- 1. Prof. Neeraj Bhargava Vishal Dutt Department of Computer Science, School of Engineering & System Sciences MDS University, Ajmer
- 2. What is a list view? A ViewGroup that displays scrollable items.
- 3. 3 Parts of a ListView The ListView itself aka a ViewGroup List items Each row/item in the list. Each item is a layout consisting of a View or ViewGroup. Data for each item
- 4. ListItem Since the ListItem can be a ViewGroup, we have the power to display very simple or extremely complex layouts for each item. A TextView A TextView and ImageView A TextView and CheckBox A TextView and Button A TextView, ImageView, CheckBox, Button, and RatingBar, etc
- 5. Where does the data come from? ListViews receive data via Adapters. The Adapter behaves as the middleman between the data source and the ListView.
- 6. The job of an Adapter The Adapter fetches data from the source. Creates the layout that represents each list item. Takes the data fetched from the source places it into the list item layout. Returns a list item to the ListView.
- 7. How an Adapter Works Array<String> mMovies = { "Bill and Ted's Excellent Adventures", "Teen Wolf", "Honey I shrunk the kids", "Texas Chainsaw Massacre", "Puppet Master" } Adapter Bill and Ted’s Excellent… Teen Wolf Honey I shrunk… Texas Chainsaw Mas… Pupper Master Bill and Ted… ListView
- 8. Data source for Adapters 1. Arrays 2. Content Provider Used to get Calendar and Contact info from phone. 3. Database Cursor
- 9. Types of Adapters ArrayAdapter Works with Arrays Can handle any Java Object as input Uses the .toString() method of the JavaObject to obtain text for list item. SimpleCursorAdapter Works with a Content Provider and Database Cursor