Android编程：2022教程

2022年Android编程教程
在这本书中，随着Android操作系统（OS）KitKat 4.4版在全球移动设备上的推出，谷歌发现了Android现在比iOS或Windows phone更受欢迎的东西。该操作系统因其易用性和开源性而受到好评，但许多iOS或Windows phone用户认为，他们喜欢的操作系统也可以做同样的事情。在某些方面确实如此，但以下是Android操作系统独有的10项功能。
1） 近场通信（NFC）
大多数安卓设备都支持NFC，NFC允许电子设备在短距离内轻松交互。这里的主要目的是创造一种比携带信用卡或现金更简单的支付方式，虽然市场并没有像许多专家预测的那样爆炸，但可能会有一种替代方案，即蓝牙低能耗（BLE）。
2） 备用键盘
安卓系统支持多个键盘，使其易于安装；快捷键、Skype和8pen应用程序都提供了快速改变键盘风格的方法。其他移动操作系统要么根本不允许使用额外的键盘，要么安装和使用键盘的过程既繁琐又耗时。
3） 红外传输
Android操作系统支持内置红外发射器，允许您将手机或平板电脑用作遥控器。
4） 无触摸控制
通过使用Wave Control等Android应用程序，用户只需使用手势即可控制手机，无需触摸。双手凌乱，但需要关掉屏幕或换首歌？易于理解的如果你开车的话，这可能会特别有用，这样你就可以两眼都盯着路了。
5） 自动化
Tasker应用程序不仅可以控制应用程序权限，还可以使其自动化。您是否只希望您的定位服务在白天处于活动状态？想要创建一种定制的方式来启动你的音乐，例如，使用语音命令和特定音量？Tasker可以帮忙。
6） 无线应用下载
在任何移动设备上访问应用商店都会令人沮丧，但iOS会让你在电脑上下载应用变得更困难，而且在你插入并访问iTunes之前，它不会同步到你的移动设备。同时，使用Android Market或AppBrain等第三方选项，您可以在PC上下载应用程序，然后自动将其与Droid同步，无需插拔。
7） 存储和电池交换
Android手机也有独特的硬件功能。谷歌的操作系统可以移除和升级你的电池，或者更换不再充电的电池。此外，安卓手机还配有SD卡插槽，用于扩展存储空间。
8） 定制主屏幕
虽然可以通过黑客攻击某些手机来定制主屏幕，但Android从一开始就具备了这一功能。下载Nova、Apex或Slide等第三方启动器，您可以为旧款设备添加手势、新的快捷方式，甚至性能增强。
9） 小部件
应用程序用途广泛，但有时你希望信息一目了然，而不必打开应用程序等待加载。Android小部件让你可以在主屏幕上显示你选择的任何功能，包括天气应用程序、音乐小部件或生产力工具，它们可以帮助提醒你即将召开的会议或即将到来的截止日期。
10） 定制光盘
这是个大问题。由于Android操作系统是开源的，开发者可以调整当前的操作系统并构建自己的版本，用户可以下载并安装这些版本来代替现有的操作系统。其中一些功能丰富，而另一些则改变了设备的外观和感觉。如果你想要一个功能，有人已经为它定制了一个ROM。
Android Programing: Tutorial 2022
Android Programing Tutorial 2022
In This Book With Android operating system (OS) KitKat version 4.4 rolling out to mobile devices across the globe, Google is on to something—Android is now more popular than iOS or the Windows phone. The OS tends to garner rave reviews for its ease of use and open source, but many iOS or Windows phone users argue that their preferred operating system can do just as much. In some respects that’s true, but here are 10 features unique to Android’s OS.
1) Near Field Communication (NFC)
Most Android devices support NFC, which allows electronic devices to easily interact across short distances. The main aim here is to create a payment option that is simpler than carrying credit cards or cash, and while the market hasn’t exploded as many experts had predicted, there may be an alternative in the works, in the form of Bluetooth Low Energy (BLE).
2) Alternate Keyboards
Android supports multiple keyboards and makes them easy to install; the SwiftKey, Skype, and 8pen apps all offer ways to quickly change up your keyboard style. Other mobile operating systems either don’t permit extra keyboards at all, or the process to install and use them are tedious and time-consuming.
3) Infrared Transmission
The Android operating system supports a built-in infrared transmitter, allowing you to use your phone or tablet as a remote control.
4) No-Touch Control
Using Android apps such as Wave Control, users can control their phones touch-free, using only gestures. Have messy hands but need to turn off your screen or change a song? Simple. This could prove especially useful if you’re driving, so you can keep both eyes on the road.
5) Automation
The Tasker app lets you not only control app permissions but also automate them. Do you only want your location services to be active during the day? Want to create a customized way to start your music—for example, with a voice command and at a certain volume? Tasker can help.
6) Wireless App Downloads
Accessing app stores on any mobile device can be frustrating, but iOS makes it a little more difficult—download an app on your computer, and it won’t sync to your mobile device until you plug in and access iTunes. Using the Android Market or third-party options like AppBrain, meanwhile, let you download apps on your PC and then automatically sync them your Droid, no plugging required.
7) Storage and Battery Swap
Android phones also have unique hardware capabilities. Google’s OS makes it possible to remove and upgrade your battery or to replace one that no longer holds a charge. In addition, Android phones come with SD card slots for expandable storage.
8) Custom Home Screens
While it’s possible to hack certain phones to customize the home screen, Android comes with this capability from the get-go. Download a third-party launcher like Nova, Apex or Slide and you can add gestures, new shortcuts, or even performance enhancements for older-model devices.
9) Widgets
Apps are versatile, but sometimes you want information at a glance instead of having to open an app and wait for it to load. Android widgets let you display just about any feature you choose, right on the home screen—including weather apps, music widgets, or productivity tools that helpfully remind you of upcoming meetings or approaching deadlines.
10) Custom ROMs
This is a big one. Because the Android operating system is open source, developers can tweak the current OS and build their own versions, which users can download and install in place of the stock OS. Some are filled with features, while others change the look and feel of a device. Chances are if there’s a feature you want, someone has already built a custom ROM for it.