How to use Simple Cursor adapter in android?
An easy adapter to map columns from a cursor to TextViews or ImageViews defined in an XML file. You can specify which columns you want, which views you want to display the columns, and the XML file that defines the appearance of these views….This constructor is deprecated.
| Parameters | |
|---|---|
| c | Cursor |
| from | String |
| to | int |
What is Cursor adapter in android?
An easy adapter to map columns from a cursor to TextViews or ImageViews defined in an XML file. Adapter that exposes data from a Cursor to a ListView widget.
How do I use a cursor adapter?
In order to use a CursorAdapter , we need to query a SQLite database and get back a Cursor representing the result set. This requires us to use a SQLiteOpenHelper for persistence as described here or an ORM that provides access to the underlying database.
What is base Adapter?
BaseAdapter is a common base class of a general implementation of an Adapter that can be used in ListView, GridView, Spinner etc. Whenever you need a customized list in a ListView or customized grids in a GridView you create your own adapter and extend base adapter in that.
How many types of layouts are there in Android?
Android Layout Types
| Sr.No | Layout & Description |
|---|---|
| 3 | Table Layout TableLayout is a view that groups views into rows and columns. |
| 4 | Absolute Layout AbsoluteLayout enables you to specify the exact location of its children. |
| 5 | Frame Layout The FrameLayout is a placeholder on screen that you can use to display a single view. |
Why adapters are used in Android?
An adapter acts as a bridge between an AdapterView and the underlying data for that view. The adapter provides access to the data items and is responsible for creating a view for each item in the data set. Adapters are a smart way to connect a View with some kind of data source.
What are different types of adapter view?
Cursor adapter has following abstract methods,
- newView(Context context, Cursor cursor, ViewGroup parent) : View This method creates new AdapterView to hold data.
- bindView(View view, Context context, Cursor cursor) : void In this method CursorAdapter just elements to list’s view.
How does notifyDataSetChanged work on Android?
notifyDataSetChanged. Notifies the attached observers that the underlying data has been changed and any View reflecting the data set should refresh itself.
What is view and ViewGroup in Android?
View is a basic building block of UI (User Interface) in android. A view is a small rectangular box that responds to user inputs. Eg: EditText, Button, CheckBox, etc. ViewGroup is an invisible container of other views (child views) and other ViewGroup. Eg: LinearLayout is a ViewGroup that can contain other views in it.