INTRODUCTION
Now is an exciting time for mobile developers. Mobile phones have never been more popular, and
powerful smartphones are now a popular choice for consumers . Stylish and versatile phones packing hardware features like GPS, accelerometer s, and touch screens, combined with fixed-rate, reasonably priced data plans provide an enticing platform upon which to create innovative mobile applications.
现如今是移动开发者们激动的时代。移动电话已变得不能再普及，性能强劲的手机对消费者只是一个大众化的选择。时髦和通用的诸如GPS、加速器、触摸屏、联邦固定汇率充斥在手机中，适度定价数据计划提供了一个有诱惑力的平台来吸引开发者创新移动应用程序。
A host of Android handsets are now available to tempt consumers, including phones with QVGA
screens and powerful WVGA devices like the Motorola Droid and the Google Nexus One. The real
win though, is for developers. With much existing mobile development built on proprietary operating systems that restrict the development and deployment of third-party applications, Android offers an open alternative. Without artificial barriers , Android developers are free to write applications that take full advantage of increasingly powerful mobile hardware and distribute them in an open market.
一台使用Android的手机现在很吸引消费者，包括使用QVGA屏幕和强大的WVGA设备的手机，诸如摩托罗拉Droid和谷歌的Nexus One。对开发者，事实上，现存的大部分移动开发都被手机所有人的操作系统限制为开发和部署第三方应用，而Android提供了一个开放的选择。不存在人为的障碍，Android开发者可以自由地完全利用性能不断增长的手机硬件开发应用程序，并将程序发布到一个开发的市场。
As a result, developer interest in Android devices has exploded as handset sales have continued to grow.
In 2009 and the early parts of 2010 more than 20 Android handsets have been released from OEMs
including HTC, Motorola, LG, Samsung, and Sony Ericsson. Android devices are now available in over 26 countries on more than 32 carriers. In the United States, Android devices are available on all four major carriers: T-Mobile, Verizon, AT&T, and Sprint. Additionally, you can now buy the unlocked Google Nexus One handset directly from Google at http://www.google.com/phone.
开发者对Android设备的爆炸似的兴趣将使得手机销售量持续增长。在2009年和2010年早些时候，开放设备联盟的厂商门发布了超过20款的Android手机，包括HTC，摩托罗拉，LG，三星和索爱。Android设备现则已经被送到超过26个国家的32个厂商。在美国，四大主流厂商使用Android设备：T-Mobile,Verizon,AT&T,安定Sprint。除此之外，
Built on an open source framework, and featuring powerful SDK libraries and an open philosophy , Android has opened mobile phone development to thousands of developers who haven’t had access to tools for building mobile applications. Experienced mobile developers can now expand into the Android platform, leveraging the unique features to enhance existing products or create innovative new ones.
Android构建在一个以强大的SDK库为特色和一个开发哲学上的开源框架上，向成千名开发者开放了移动手机开发工具以助他们构建移动应用程序。有经验的开发者现在就可以投入Android平台，增加已有产品的特性或者以创建新产品来得到回报。
Using the Android Market for distribution, developers can take advantage of an open marketplace,
with no review process, for distributing free and paid apps to all compatible Android devices.
开发者可以利用一个开放的市场--Android Market来分发应用程序，不需要评审流程，可以以免费或者收费方式来发布兼容任何Android设备的应用程序。