Book Image

Android Studio 3.5 Development Essentials - Java Edition

By : Neil Smyth
Book Image

Android Studio 3.5 Development Essentials - Java Edition

By: Neil Smyth

Overview of this book

Android applications have become an important part of our daily lives and lots of effort goes into developing an Android application. This book will help you to build you own Android applications using Java. Android Studio 3.5 Development Essentials – Java Edition first teaches you to install Android development and test environment on different operating systems. Next, you will create an Android app and a virtual device in Android Studio, and install an Android application on emulator. You will test apps on physical Android devices, then study Android Studio code editor and constraint layout, Android architecture, the anatomy of an Android app, and Android activity state changes. The book then covers advanced topics such as views and widgets implementation, multi-window support integration, and biometric authentication, and finally, you will learn to upload your app to Google Play console and handle the build process with Gradle. By the end of this book, you will have gained enough knowledge to develop powerful Android applications using Java.
Table of Contents (86 chapters)
86
Index

18.13 Adding Barriers

Barriers are added by right-clicking on the layout and selecting either the Add Vertical Barrier or Add Horizontal Barrier option from the Helpers menu, or using the toolbar menu options as shown previously in Figure 18-28.

Once a barrier has been added to the layout, it will appear as an entry in the Component Tree panel:

Figure 18-31

To add views as reference views (in other words, the views that control the position of the barrier), simply drag the widgets from within the Component Tree onto the barrier entry. In Figure 18-32, for example, widgets named textView1 and textView2 have been assigned as the reference widgets for barrier1:

Figure 18-32

After the reference views have been added, the barrier needs to be configured to specify the direction of the barrier in relation those views. This is the barrier direction setting and is defined within the Attributes tool window when the barrier is selected in the Component Tree panel:

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