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Questions and Answers
What is Spinner in Android used for?
What is Spinner in Android used for?
To select one value from a set of values
What is needed to fill data in a Spinner?
What is needed to fill data in a Spinner?
An ArrayAdapter in Android expects a Layout with a single __________.
An ArrayAdapter in Android expects a Layout with a single __________.
TextView
What is the purpose of resource id in ArrayAdapter?
What is the purpose of resource id in ArrayAdapter?
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AdapterView is responsible for showing data on different views like listview, gridview, and spinner.
AdapterView is responsible for showing data on different views like listview, gridview, and spinner.
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What is the purpose of a Spinner in Android?
What is the purpose of a Spinner in Android?
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What is an adapter in Android?
What is an adapter in Android?
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_______ is used to set the layout (xml file) for list items in a Spinner.
_______ is used to set the layout (xml file) for list items in a Spinner.
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ArrayAdapter expects a Layout with multiple TextViews by default.
ArrayAdapter expects a Layout with multiple TextViews by default.
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Study Notes
Spinner
- Spinner is a widget that provides a quick way to select one value from a set of values in Android
- It is similar to a drop-down list seen in other programming languages
- By default, a spinner shows its currently selected value
- Spinner is associated with an Adapter view to fill data in the spinner
Adapter and Adapter Views
- An adapter is a bridge between the UI component and data source that helps to fill data in UI components
- It holds data and sends it to the adapter view, which then shows the data on different views like ListView, GridView, and Spinner
- ArrayAdapter is used when you have a list of single-type items backed by an array
- Examples include a list of phone contacts, countries, or names
ArrayAdapter Syntax
-
ArrayAdapter(Context context, int resource, int textViewResourceId, T[] objects) -
context: the first parameter is used to pass the context, which is a reference to the current class -
resource: the second parameter is the resource ID used to set the layout (XML file) for list items -
textViewResourceId: the third parameter is used to set the ID of the TextView where you want to display the actual text -
objects: the fourth parameter is an array of objects used to set the array of elements in the TextView
Example of Spinner
- Create a Spinner in
activity_main.xmlandMainActivity.javafiles - Use
ArrayAdapterto fill the Spinner with data - Set the
OnItemSelectedListenerto perform actions when an item is selected
Menu in Android
- There are three types of menus in Android: Option Menu, Context Menu, and Pop-up Menu
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Description
Learn about the Spinner control in Android and how it uses an Adapter to display data. Understand the Adapter's role in bridging the UI component with the data source.
