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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?
- List
- Adapter (correct)
- Array
- Intent
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?
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.
What is the purpose of a Spinner in Android?
What is the purpose of a Spinner in Android?
What is an adapter in Android?
What is an adapter in Android?
_______ 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.
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 classresource: the second parameter is the resource ID used to set the layout (XML file) for list itemstextViewResourceId: the third parameter is used to set the ID of the TextView where you want to display the actual textobjects: 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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