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

40.8 Designing the Menu

Within the Project tool window, locate the project’s app -> res -> menu -> menu_main.xml file and double-click on it to load it into the Layout Editor tool. Switch to Design mode if necessary and select and delete the default Settings menu item added by Android Studio so that the menu currently has no items.

From the palette, click and drag a menu group object onto the title bar of the layout canvas as highlighted in Figure 40-5:

Figure 40-5

Although the group item has been added, it will be invisible within the layout. To verify the presence of the element, refer to the Component Tree panel where the group will be listed as a child of the menu:

Figure 40-6

Select the group entry in the Component Tree and, referring to the Attributes panel, set the checkableBehavior property to single so that only one group menu item can be selected at any one time:

Figure 40-7

Next, drag four Menu Item elements from the palette...