what has controls such as buttons text boxes drawing and media controls
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Android Developers
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Build a simple user interface
In this lesson, you learn how to use the Android Studio Layout Editor to create a layout that includes a text box and a button. This sets up the next lesson, where you learn how to make the app send the content of the text box to another activity when the button is tapped.
Figure 1. Screenshot of the final layout
The user interface (UI) for an Android app is built as a hierarchy of layouts and widgets. The layouts are ViewGroup objects, containers that control how their child views are positioned on the screen. Widgets are View objects, UI components such as buttons and text boxes.
Figure 2. Illustration of how ViewGroup objects form branches in the layout and contain View objects.
Android provides an XML vocabulary for ViewGroup and View classes, so most of your UI is defined in XML files. However, rather than teach you to write XML, this lesson shows you how to create a layout using Android Studio's Layout Editor. The Layout Editor writes the XML for you as you drag and drop views to build your layout.
This lesson assumes that you use Android Studio v3.0 or higher and that you've completed the create your Android project lesson.
Open the Layout Editor
To get started, set up your workspace as follows:
In the Project window, open app > res > layout > activity_main.xml.
To make room for the Layout Editor, hide the Project window. To do so, select View > Tool Windows > Project, or just click Project on the left side of the Android Studio screen.
If your editor shows the XML source, click the Design tab at the bottom of the window.
Click Select Design Surface and select Blueprint.
Click Show in the Layout Editor toolbar and make sure that Show All Constraints is checked.
Make sure Autoconnect is off. A tooltip in the toolbar displays Enable Autoconnection to Parent when Autoconnect is off.
Click Default Margins in the toolbar and select 16. If needed, you can adjust the margins for each view later.
Click Device for Preview in the toolbar and select 5.5, 1440 × 2560, 560 dpi (Pixel XL).
Explanation:
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