The document discusses various aspects of the Android graphical user interface including: 1. The Android browser is based on the WebKit engine and can be embedded as a widget to display HTML or perform browsing. It accesses the internet through available connections on the device. 2. Developers can add custom fonts to their applications by creating a fonts folder in assets and binding fonts to UI widgets. 3. Tabs can be used to display multiple pieces of information in an app in a simple way, showing one portion at a time. The tab widget implements tab buttons and a frame layout contains the tab contents.

1. Android
Graphical User Interface

2. Agenda
Fonts
Tab
Web Kit Browser

3. WebKit Browser

4. Web Kit Browser
 In Android you can embed the built‐in Web browser as a widget in
your own activities, for displaying HTML material or perform
Internet browsing.
 The Android browser is based on WebKit, the same engine that
powers Apple's Safari Web browser.
 Android uses the WebView widget to host the browser’s pages
 Applications using the WebView component must request
 INTERNET permission.

5. WebKit Browser - Browsing Power
 The browser will access the Internet through whatever means are available
to that specific device at the present time (WiFi,cellular network,
Bluetooth‐tethered phone, etc.).
 The WebKit rendering engine used to display web pages includes
methods to
 1. navigate forward and backward through a history,
 2. zoom in and out,
 3. perform text searches,
 4. load data
 5. stop loading and
 6. more.

6. Example –Web Kit Browser (XML Layout)

7. Example –Web Kit Browser (Activity)

8. Example –Web Kit Browser (Manifest)

9. Browser Commands
There is no navigation toolbar with the WebView widget (saving space). You could supply the
UI –such as a Menu– to execute the following operations:
 reload() to refresh the currently‐viewed Web page
 goBack() to go back one step in the browser history, and canGoBack() to
determine if there is any history to trace back
 goForward() to go forward one step in the browser history, and canGoForward()
to determine if there is any history to go forward to
goBackOrForward() to go backwards or forwards in the browser history,where
negative/positive numbers represent a count of steps to go
canGoBackOrForward() to see if the browser can go backwards or forwards the
stated number of steps (following the same positive/negative
convention as goBackOrForward())
 clearCache() to clear the browser resource cache and clearHistory() to clear the
browsing history

10. Fonts

11. Fonts
Developers may add any font to their application by
following the next steps:
1. Create the /fonts folder in the /assets directory.
2. Copy any fonts you plan to use into the new folder.
3. Use Java code to bind the font with the UI widget wanting
to display the custom typeface (see example)

12. Example - fonts

13. Tab Selection Widget
 Android UIs should be kept simple at all costs.
When many pieces of information must be displayed in a
single app, the Tab Widget could be used to make the
user aware of the pieces but show only a portion at the
time.

14. Tabs – Components
There are a few widgets and containers you need to use in order to set
up a tabbed portion of a view:
 TabHost is the main container for the tab buttons and tab
contents
 TabWidget implements the row of tab buttons, which contain
text labels and optionally contain icons
 FrameLayout is the container for the tab contents

15. Example: Tabs (Xml Layout)

16. Questions?