When using the EditText widget it is necessary to specify an input type for the view. Move the component to the center of the display so that the center guidelines appear and drop it into place so that the layout resembles that of Figure 13-2. Select the TextView object in the Layout Editor canvas and press the Delete key on the keyboard to remove it from the design.įrom the Palette located on the left side of the Layout Editor, select the Text category and, from the list of text components, click and drag a Plain Text component over to the visual representation of the device screen. Instead of the “Hello world!” TextView currently present in the user interface design, the activity actually requires an EditText view. With the user interface layout loaded into the Layout Editor tool, it is now time to design the user interface for the example application.
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Once located, double-clicking on the file will load it into the Android Studio Layout Editor tool. If it is not, navigate to it in the project tool window where it can be found in the app -> res -> layout folder. This is stored in a file named content_state_change.xml which should already be loaded into the Layout Editor tool. The next action to take involves the design of the content area of the user interface for the activity. Upon completion of the project creation process, the StateChange project should be listed in the Project tool window located along the left-hand edge of the Android Studio main window. Proceed through the screens, requesting the creation of a Basic Activity named StateChangeActivity with a corresponding layout named activity_state_change. On the form factors screen, enable the Phone and Tablet option and set the minimum SDK setting to API 26: Android 8.0 (Oreo). Select the Start a new Android Studio project quick start option from the welcome screen and, within the resulting new project dialog, enter StateChange into the Application name field and as the Company Domain setting before clicking on the Next button. Begin by launching Android Studio and, if necessary, closing any currently open projects using the File -> Close Project menu option so that the Welcome screen appears.
The first step in this exercise is to create the new project. Creating the State Change Example Project In the next chapter, entitled “Saving and Restoring the State of an Android Activity”, the example project constructed in this chapter will be extended to demonstrate the saving and restoration of dynamic activity state.
The purpose of this example application is to provide a real world demonstration of an activity as it passes through a variety of different states within the Android runtime. In this chapter, we will put the theory of handling activity state changes into practice through the creation of an example application. The previous chapters have discussed in some detail the different states and lifecycles of the activities that comprise an Android application. Purchase the fully updated Android Studio Chipmunk Edition of this publication in eBook ($29.99) or Print ($46.99) formatĪndroid Studio Chipmunk Essentials - Java Edition Print and eBook (PDF) editions contain 94 chapters and over 800 pages You are reading a sample chapter from the Android Studio 3.2 Edition of this book.
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