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I know, this preaching of mine is a little heavy-handed. The problem is that 90 percent of the problems I see students struggling with in classes, and on the job, could be solved if those folks took a few minutes to sit back, breathe deeply, and read the help. Of course, you need to understand what you re reading, and that s what this chapter is all about. From here on out, this book is going to do a couple of things to help encourage you to read the help:

Most of the remaining collection types will follow this pattern, allowing both one-to-many and many-to-many associations.

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This doesn t mean that the voice network isn t important we ll cover telephony explicitly in chapter 7 but we admit that voice is a commodity and data is what we ll focus on when talking about the network Android provides access to networking in several ways, including mobile Internet Protocol (IP), Wi-Fi, and Bluetooth It also provides some open and closed source thirdparty implementations of other networking standards such as ZigBee and Worldwide Interoperability for Microwave Access (WiMAX) In this chapter, though, we ll concentrate on getting your Android applications to communicate using IP network data, using several different approaches We ll cover a bit of networking background, and then we ll deal with Android specifics as we explore communication with the network using sockets and higher-level protocols such as Hypertext Transfer Protocol (HTTP) Android provides a portion of the javanet package and the orgapache.

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httpclient package to support basic networking Other related packages, such as androidnet, address internal networking details and general connectivity properties You ll encounter all these packages as we progress though networking scenarios in this chapter In terms of connectivity properties, we ll look at using the ConnectivityManager class to determine when the network connection is active and what type of connection it is: mobile or Wi-Fi From there, we ll use the network in various ways with sample applications One caveat to this networking chapter is that we won t dig into the details concerning the Android Wi-Fi or Bluetooth APIs Bluetooth is an important technology for close-range wireless networking between devices, but it isn t available in the Android emulator (see chapter 14 for more on Bluetooth) On the other hand, Wi-Fi has a good existing API but also doesn t have an emulation layer.

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Because the emulator doesn t distinguish the type of network you re using and doesn t know anything about either Bluetooth or Wi-Fi, and because we think the importance lies more in how you use the network, we aren t going to cover these APIs If you want more information on the WiFi APIs, please see the Android documentation (http://codegooglecom/android/ reference/android/net/wifi/package-summaryhtml) The aptly named sample application for this chapter, NetworkExplorer, will look at ways to communicate with the network in Android and will include some handy utilities Ultimately, this application will have multiple screens that exercise different networking techniques, as shown in figure 61 After we cover general IP networking with regard to Android, we ll discuss turning the server side into a more robust API itself by using web services.

On this topic, we ll work with plain old XML over HTTP (POX) and Representational State Transfer (REST) We ll also discuss the Simple Object Access Protocol (SOAP) We ll address the pros and cons of the various approaches and why you might want to choose one method over another for an Android client Before we delve into the details of networked Android applications, we ll begin with an overview of networking basics If you re already well versed in general.

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