android studio spinner set selected item

This method is provided by the ArrayAdapter class and it returns us an ArrayAdapter instance from the external resource we provide it as our data source. We are using a static method called createFromResource(). We use the default spinner Layout( android.R.layout.simple_spinner_item). We can then instantiate a SpinnerAdapter(e.g ArrayAdapter). Spinner spinner = (Spinner) findViewById(R.id.mySpinner) Then in our java code we can first reference the Spinner from our Layout specification using the findViewById() method our activity class. This pattern of specifyng an Object in the Layout resource then referencing from the Java/Kotlin code is common in android as a platform and is also the one recommended. We can use the Spinner object to specify the spinner in an xml Layout. This allows Spinner to set and return a SpinnerAdapter. For example, Spinner is an adapterview since it derives from the AbsSpinner. public class SpinnerĪbsSpinner provides to Spinner much of the capabilities it has. Spinner is a public class that’s why we can access and use it. Hence we can customize the views shown in the spinner without affecting data.

This makes Spinner like other adapterviews decoupled from data source. This means that it relies on an Adapter for its data.Īdapters act as the bridge between adapterviews and the underlying data source. Spinner is a view that displays items in a dropdown fashion, allowing user to pick one at a time.

This class also resides in the android.widget package.ĪbsSpinner provides to Spinner much of the capabilities it has. Spinner class inherits from an abstract class called AbsSpinner. Public classes are visible even from other packages apart from those they’ve been defined.

Spinner is a concrete public class residing in the android.widget package.

Android studio spinner set selected item