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AdapterView is a ViewGroup in Android which displays items loaded into an adapter. Here we learn about AdapterView in Android.
Most of the Android application contains at least one list view which is one way of displaying a collection of items.
Using an adapter the list items are automatically inserted into the list that pulls content from an external source such as an array or database and then each item is converted into a view that's placed into the list.
Android grid view shows items in a two-dimensional scrolling grid (rows and columns) and the grid items are not necessarily predetermined but are automatically inserted into the layout using a List Adapter.
Spinner allows you to select an item from a dropdown menu. When you are using the Gmail application you would get a drop-down menu, you need to select an item from a dropdown menu.
Android action bar was introduced to maintain consistent navigation across the application.
Android Action bar mainly contains four functional areas -
Android's new version system named Android Lollipop is highly focused on rich user experience which is called as 'Material design'. So Tool bar Android is replacement of Action bar in new android operating system and it is made quite flexible according to usage.
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