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Notice that the ConstraintLayout contains a TextView. Explore width and height properties Now that you have a new screen background color, you will use it to explore the effects of changing the width and height properties of views.

First, it builds your application.

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Constrain the left and right sides of the new button to its neighboring buttons. Your layout might have different margins and perhaps some different vertical or horizontal bias constraints. Constrain the top and bottom of the new button the same as the existing buttons. Practice using the layout icons in the top left of the design toolbar to display the design view, the blueprint view, and both views side by side. Use the device menu to view the layout on different devices. Expand the manifests folder. In the text field of the TextView in the Properties panel, change the value of the text again and press Enter to complete the selection Switch back to the Text tab to verify that the text changed in the XML. You will learn how to define your own colors soon. The latter lets you designate one class as having a main method, which can be executed by the build from the command line. Press to insert the selection with a trailing comma. Choose a device definition, such as Nexus 5, and click Next. How to create a device in the emulator. The top of the button is now constrained to the bottom of the TextView. It also offers an interactive color chooser.

Now you can connect your device and run the app from Android Studio. Read them carefully. Select your device, and click OK.

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Or in the Properties panel, move the cursor over the circle for the constraint until it shows an x, then click it. Run the Java application in a container In the Project tool window, right-click the project name, point to New and click File. Select the background property and press Enter. Explore width and height properties Now that you have a new screen background color, you will use it to explore the effects of changing the width and height properties of views. Explore view hierarchies In the Component Tree, notice that the root of the view hierarchy is a ConstraintLayout view. What you'll learn How to add new views to your layout. Usually, live templates contain blocks of code that you use most often. Change the text color. How to set property values. Select the TextView in the Component Tree. Test; import static org. If a Download link is visible next to a latest release, it is not installed yet, and you need to download it. The java folder contains three subfolders: com. If not, the libraries will be downloaded and stored there. Using resources enables you to use the same values in multiple places, or to define values and have the UI update automatically whenever the value is changed.

After that, the JVM runs the bytecode. The results of changing layout height and width. Live templates are code snippets that you can insert into your code. If your Properties panel looks different from the one shown, click the View all properties icon to toggle the view.

Adjust the sides of the panels so that you can see everything in the Component Tree.

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Constrain the left and right sides of the new button to its neighboring buttons. Scroll through the list to get an idea of the properties you could set for a TextView.

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The root view is always a view group, which is a view that contains other views. Explore width and height properties Now that you have a new screen background color, you will use it to explore the effects of changing the width and height properties of views. You see that the TextView now has a dark blue background, and the text is displayed in white. In the text field of the TextView in the Properties panel, change the value of the text again and press Enter to complete the selection Switch back to the Text tab to verify that the text changed in the XML. A built Java archive is called an artifact. Click Android 3 to explore the other Project views that are available. In the Design tab, notice that the entire background of the screen uses the screenBackground color. The emulator starts and boots just like a physical device. The top of the button is now constrained to the bottom of the TextView.
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