There may be cases where we want to define attributes not exposed in the original theme (i.e. If you run your application now, you should see the following output. Note that the spinner is bound to the string array and will display the theme names that we will be defining later on. Open res/layout/activity_theme.xml file and go to the xml tab. Next, let's create an activity layout where the themes will be selected and applied. Feel free to replace YOUR-CUSTOM-THEME-NAME with a theme name of your choice below. Let's also add to res/values/strings.xml the list of all the themes we will be allowed to choose from the spinner. Add the following to res/values/strings.xml: Theme Switcher Select Theme: Credentials username password Sync automatically Location On Off Clear Data
Next, let's add the strings for our input views. Later on we'll be applying all our styles and themes to this layout file. Keep other default selections, go Next till you reach Finish.Ĭreate a simple layout for our app.Name the first activity "ThemeActivity".Enter App name: ThemeSwitcher (minSDK 16).Open Android Studio and go to File -> New Project.By the end of this exercise, you should know how to define a theme in your resources in an XML file, how to define attributes of the theme, how to apply those to your layout file, and finally how to dynamically change the theme of an activity. We will be defining multiple themes in our app and use a spinner view to switch between themes. A Theme is a Style that applies to the entire application or a certain Activity. Styles in Android is similar in concept to CSS on web because it separates design from the content. A style is a xml resource and it separates the design attributes from XML layout. For more general overview of these concepts, check out Styles and Themes cliffnotes.Ī style in Android is a collection of attribute/value pairs applied to a view. At the end of this exercise, you will have better understanding of some of the core features of Android like - drawables, styles and themes. The following tutorial explains how to build an application that can switch between multiple distinct themes.
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