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Earlier, we mentioned that a certificate has an expiration date and that Google recommends you set expiration dates far into the future, to account for a lot of application updates. That said, what happens if the certificate does expire Would Android still run the application Fortunately, yes Android tests the certificate s expiration only at install time. Once your application is installed, it will continue to run even if the certificate expires. But what about updates Unfortunately, you will not be able to update the application once the certificate expires. In other words, as Google suggests, you need to make sure the life of the certificate is long enough to support the entire life of the application. If a certificate does expire, Android will not install an update to the application. The only choice left will be for you to create another application an application with a different package name and sign it with a new certificate. So as you can see, it is critical for you to consider the expiration date of the certificate when you generate it. Now that you understand security with respect to deployment and installation, let s move on to runtime security in Android.

n this chapter, we are going to talk about Android s application-security model and locationbased services. Although the two topics are disparate, you need to understand security prior to working with location-based services. The first part of the chapter discusses security, which is a fundamental part of the Android Platform. In Android, security spans all phases of the application lifecycle from design-time policy considerations to runtime boundary checks. You ll learn Android s security architecture and understand how to design secure applications. The second part of the chapter concerns location-based services. Location-based services comprise one of the more exciting pieces of the Android SDK. This portion of the SDK provides APIs to let application developers display and manipulate maps, obtain real-time device-location information, and take advantage of other exciting features. After you read this section of the book, you ll definitely be convinced that Android is truly amazing. Let s get started with the Android security model.

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This sample data comes from the syslog file on one of my machines (it s a Linux box named bebop). Syslog is a logging facility found on most Unix and Unix-like systems. It is even available for Microsoft Windows systems, although it is very infrequently found in the wild. These messages are not particularly interesting, but they represent normal messages that you might find in a syslog file. Nov Nov Nov Nov Nov 22 22 22 22 22 17:38:25 17:38:25 17:38:25 21:04:46 21:04:46 bebop bebop bebop bebop bebop kernel: kernel: exiting syslogd kernel: Kernel logging (proc) stopped. Kernel log daemon terminating. on signal 15 1.4.1#17: restart. klogd 1.4.1#17, log source = /proc/kmsg started.

what your workstation s IP address is.) You will need to modify Listing 8 4 by substituting the IP address with the IP address of your workstation. But what about SOAP There are lots of SOAP-based web services on the Internet, but to date, Google has not provided direct support in Android for calling SOAP web services. Google instead prefers REST-like web services, seemingly to reduce the amount of computing required on the client device. However, the tradeoff is that the developer must do more work to send data and to parse the returned data. Ideally, you will have some options for how you can interact with your web services. Some developers have used the kSOAP2 developer kit to build SOAP clients for Android. We won t be covering that approach, but it s out there if you re interested (http://ksoap2.sourceforge.net/).

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