Android开发文档API Guides网上没有中文翻译的，最近在看这部分内容，顺便给大家做翻译。
英文水平不好，大家包涵。
文档连接是http://developer.android.com/guide/topics/ui/accessibility/index.html
Accessibility
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Many Android users have different abilities that require them to interact with their Android devices in different ways. These include users who have visual, physical or age-related limitations that
prevent them from fully seeing or using a touchscreen, and users with hearing loss who may not be able to perceive audible information and alerts.
很多的Android使用者有不同功能，这就要求他们用不同的方式和Android设备交互。这包括那些有视觉上，生理上，年龄相关等缺陷的用户，他们不能完全看见或者使用触摸屏，那些听力缺陷的用户，可能无法察觉声音信息和提示。
Android provides accessibility features and services for helping these users navigate their devices more easily, including text-to-speech, haptic feedback, gesture navigation, trackball and directional-pad navigation.
Android application developers can take advantage of these services to make their applications more accessible.
Aandroid提供了一些易接近的特性和服务去帮助这些用户更容易地使用他们的设备。这些特性包括文本翻译成声音，接触反馈，手势导航，轨迹球和定向键导航。Android应用开发者可以利用这些服务使他们的app更加易被使用。
Android developers can also build their own accessibility services, which can provide enhanced usability features such as audio prompting, physical feedback, and alternative navigation modes. Accessibility services
can provide these enhancements for all applications, a set of applications or just a single app.
Android开发者也可以创建他们自己的可接入性服务，这些服务可以提供能提高可用性的特性，例如声音提示，物理反馈和其他的导航模式。这些可接入性的服务可以提供这些功能升级给所有的app,部分app或者单个app。
The following topics show you how to use the Android framework to make applications more accessible.
接下来的主题是告诉你怎么去使用Android framework去使你的app更加易被使用。
- Making Applications Accessible
- Development practices and API features to ensure your application is accessible to users with disabilities.
- Accessibility Developer Checklist
- A checklist to help developers ensure that their applications are accessible.
- Building Accessibility Services
- How to use API features to build services that make other applications more accessible for users.