Applications and Widgets

The highest layer in the Android architecture diagram is the Applications and Widgets layer. Think of this as the tip of the Android iceberg. End users will see only these programs, blissfully unaware of all the action going on below the waterline. As an Android developer, however, you know better.

Applications are programs that can take over the whole screen and interact with the user. On the other hand, widgets (which are sometimes called gadgets), operate only in a small rectangle of the Home screen application.

The majority of this book will cover application development, because that's what most of you will be writing. Widget development is covered in Chapter 12, There's No Place Like Home, on page 233.

When someone buys an Android phone, it will come prepackaged with a number of standard system applications, including the following:

0 0

Post a comment