1.5的新特性:

New FeaturesFor a list of new system features, see the Android 1.5
Platform Highlights document.

API ChangesOverview
UI framework
Framework for easier background/UI thread interaction
New SlidingDrawer widget
New HorizontalScrollview widget
AppWidget framework
APIs for creating secure home screen AppWidgets. For information about
how to use AppWidgets, see the Developer's Guide AppWidgets
documentation. Also see Introducing home screen widgets and the
AppWidget framework on the Android Developer's Blog.
APIs for populating Live Folders with custom content.
Media framework
Raw audio recording and playback APIs
Interactive MIDI playback engine
Video recording APIs for developers (3GP format)
Video and photo sharing Intents
Media search Intent
Input Method framework
Input Method Service framework
Text-prediction engine
Ability to provide downloadable IMEs to users
Application-defined hardware requirements
Applications can now use a new element in their manifest files, <uses-
configuration> to indicate to the Android system what hardware
features they require in order to function properly. For example, an
application might use the element to specify that it requires a
physical keyboard or a particular navigation device, such as a
trackball. Prior to installing the application, the Android system
checks the attributes defined for the <uses-configuration> element and
allows the installation to continue only if the required hardware is
present.

Speech recognition framework
Support for using speech recognition libraries via Intent. See
RecognizerIntent.
Miscellaneous API additions
LocationManager - Applications can get location change updates via
Intent
WebView - Touch start/end/move/cancel DOM event support
Redesigned Sensor Manager APIs
GLSurfaceView - convenience framework for creating OpenGL
applications
Broadcast Intent for app update install succeeded - for smoother app
upgrade experience
API Change Details
For a detailed view of API changes in this platform (API Level 3), see
the API Differences Report.

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