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Modern Operating Systems by Herbert Bos and Andrew S. Tanenb...
Modern_Operating_Systems_by_Herbert_Bos_and_Andrew_S._Tanenbaum_4th_Ed.pdf
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Modern Operating Systems by Herbert Bos and Andrew...
Modern_Operating_Systems_by_Herbert_Bos_and_Andrew_S._Tanenbaum_4th_Ed.pdf-M ODERN O PERATING S YSTEMS
Modern Operating Systems by Herbert...
Modern_Operating_Systems_by_Herbert_Bos_and_Andrew_S._Tanenbaum_4th_Ed.pdf-M ODERN O PERATING S YSTEMS
Page 836
SEC. 10.8
ANDROID
805
applications as a single process on a host computer.
In fact there are still some
remnants of this old implementation around today, with things like the
Applica-
tion.onTerminate
method still in the
SDK
(
Software Development Kit
), which
Android programmers use to write applications.
In June 2006, two hardware devices were selected as software-development
targets for planned products.
The first, code-named ‘‘Sooner,’’ was based on an
existing smartphone with a QWERTY keyboard and screen without touch input.
The goal of this device was to get an initial product out as soon as possible, by
leveraging existing hardware. The second target device, code-named ‘‘Dream,’’
was designed specifically for Android, to run it as fully envisioned. It included a
large (for that time) touch screen, slide-out QWERTY keyboard, 3G radio (for fast-
er web browsing), accelerometer, GPS and compass (to support Google Maps), etc.
As the software schedule came better into focus, it became clear that the two
hardware schedules did not make sense. By the time it was possible to release
Sooner, that hardware would be well out of date, and the effort put on Sooner was
pushing out the more important Dream device. To address this, it was decided to
drop Sooner as a target device (though development on that hardware continued for
some time until the newer hardware was ready) and focus entirely on Dream.
Android 1.0
The first public availability of the Android platform was a preview SDK re-
leased in November 2007.
This consisted of a hardware device emulator running a
full Android device system image and core applications, API documentation, and a
development environment. At this point the core design and implementation were
in place, and in most ways closely resembled the modern Android system architec-
ture we will be discussing.
The announcement included video demos of the plat-
form running on top of both the Sooner and Dream hardware.
Early development of Android had been done under a series of quarterly demo
milestones to drive and show continued process.
The SDK release was the first
more formal release for the platform.
It required taking all the pieces that had been
put together so far for application development, cleaning them up, documenting
them, and creating a cohesive development environment for third-party developers.
Development now proceeded along two tracks: taking in feedback about the
SDK to further refine and finalize APIs, and finishing and stabilizing the imple-
mentation needed to ship the Dream device. A number of public updates to the
SDK occurred during this time, culminating in a 0.9 release in August 2008 that
contained the nearly final APIs.
The platform itself had been going through rapid development, and in the
spring of 2008 the focus was shifting to stabilization so that Dream could ship.
Android at this point contained a large amount of code that had never been shipped
as a commercial product, all the way from parts of the C library, through the
Dalvik interpreter (which runs the apps), system, and applications.
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