Hi Froyo, Android 2.2 announced !

作者：旅行中 5月 20, 2010

Android 2.2 announced ! API Level: 8

Android 2.2 is a minor platform release including user features, developer features, API changes, and bug fixes. For information on developer features and API changes, see the Framework API section.

修改幅度應該是像Cupcake –> Donut一樣，比較像是補充包 xD

待會來看一下Code來看有多少個Commit !
以下有官方完整的介紹：
Android 2.2 Platform Highlights
http://developer.android.com/sdk/android-2.2-highlights.html
先來整理一下自己有興趣的部份。

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Framework的修改：

1. 安裝APK到SD-card

可以在manifest裡面宣告 installLocation ("internalOnly", "preferExternal", and "auto")。

2. Data Backup

the Backup Manager handles the work of transporting the application data to and from the backup storage area in the cloud.

3. Gesture –> multitouch !!

New ScaleGestureDetector that lets Views detect and handle transformation gestures that involve more than one pointer (multitouch) using the supplied MotionEvents.

4. 新增的Permission

android.permission.BIND_DEVICE_ADMIN

— Any device administration broadcast receiver must require this permission, to ensure that only the system can interact with it.

android.permission.KILL_BACKGROUND_PROCESSES

— Allows an application to call killBackgroundProcesses(String).

android.permission.SET_TIME

— Allows an application to set the system time.

Media的修改：

這一次也是多了很多API來調整Audio以及讓開發者更容易使用語音辨識的功能。不過Media真的很多專業知識，完全沒碰過阿。

1. Graphics

using ETC1 for texture compression. –> 不懂
enable compression from YUV to JPEG and manipulation of YUV data. –> 不懂

2. Audio的部份

New APIs in android.media.AudioManager for managing audio focus, transport control, transient loss of audio focus, ducking. –> 不懂
New broadcast intent for routing audio to SCO –> SCO @@ 不懂

3. Speech recognition

the APIs are sufficient to integrate voice recognition deeply into an IME. –> Google說我給你的API足夠你開發語音輸入!
不過我到覺得以下特點，倒是可以讓語音辨識的準度提昇不少：
New RecognizerIntent extras that let a requester app specify details as preferred language, minimum length in milliseconds, and so on.

4. Camera and camcorder

感覺每一版都會針對Camera動刀，而且還是大刀。
這次有提到Changes to camera preview API to improve efficieny of preview pipeline. 希望真的有明顯的提昇。

跟Net比較相關的＠＠

感覺不多，原本印象中有要針對EAS做些改進，卻沒有在官方文件中提到＠＠到底有沒有補些什麼新功能呢？
還是看Code比較實在。

1. Device policy manager

New device policy management APIs allow developers to write "device administrator" applications that can control security features of the device.
可以讓開發者針對密碼作些設定，例如密碼最短長度。

2. Accounts and sync

New method AddPeriodicSync() lets you schedule a periodic sync with a specific account, authority, and extras at the given frequency.

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快來下載SDK來試試看吧：）
官方影片：

Android 2.2 要來啦 ~
Android 2.2 and developers goodies.
Android 2.2 Froyo正式發表

其他Google I/O 文章：

Google I/O 2011 重點整理
2011年的Chrome瀏覽器
2010年Google I/O Android 2.2 要來啦 ~