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Themes and Menus: The Sudoku Example

Themes and Menus: The Sudoku Example. Content taken from book: “Hello, Android” by Ed Burnette Third Edition. Review of key concepts. Alternate Resources Defining new activities Starting new activities. Alternate Resources. Defining new activity. res/layout/about.xml.

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Themes and Menus: The Sudoku Example

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  1. Themes and Menus:The Sudoku Example Content taken from book: “Hello, Android” by Ed Burnette Third Edition

  2. Review of key concepts • Alternate Resources • Defining new activities • Starting new activities

  3. Alternate Resources

  4. Defining new activity • res/layout/about.xml add strings for the title of the About dialog box and the text it contains to res/values/strings.xml

  5. Starting activities • To start an activity in Android, we first need to create an instance of the Intent class.

  6. Activities and the Manifest • Every activity needs to be declared in AndroidManifest.xml <activity android:name=".About" android:label="@string/about_title" > </activity>

  7. Themes • A theme is a collection of styles that override the look and feel of Android widgets • Themes were inspired by Cascading Style Sheets (CSS) used for web pages • They separate the content of a screen and its presentation or style • Android is packaged with several themes that you can reference by name

  8. Custom themes • You can make up your own theme by subclassing existing ones and overriding their default values • Define your own custom theme in res/values/styles.xml

  9. Predefined Themes • Activities should include a theme property • The AndroidManifest.xml should list the activity definition • To use a predefined theme, change the definition of the activity listed in the AndroidManifest.xml to include a theme property

  10. With/Without custom theme

  11. Android Resources • The @android: prefix in front of the style name means this is a reference to a resource defined by Android, not one that is defined in your program.

  12. Menus • Android supports two kinds of menus. • First, there is the menu you get when you press the physical Menu button. • Second, there is a context menu that pops up when you press and hold your finger on the screen (or press and hold the trackball or the D-pad center button).

  13. Menu from “menu key” • res/menu/menu.xml • strings.xml

  14. Modify sudoku.java getMenuInflater( ) returns an instance of MenuInflater that we use to read the menu definition from XML and turns it into a real view. When the user selects any menu item, onOptionsItemSelected( ) will be called.

  15. Program preferences • res/xml/settings.xml

  16. Preferences activity • Prefs.java The addPreferencesFromResource( ) method reads the settings definition from XML and inflates it into views in the current activity.

  17. Add Prefs activity to Manifest • Modify AndroidManifest.xml to include the Prefs activity

  18. New game option • res/values/strings.xml • res/values/arrays.xml

  19. Modify Sudoku class • Sudoku.java

  20. Exiting the game • Modify the Sudoku.java file

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