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As of the time of this writing, the Android devices that have been released have been Google Experience phones. This means they get the standard Android interface the things you find in the emulator along with the standard roster of add-on applications like Google Maps and Gmail. In turn, manufacturers are allowed to put the with Google brand on the device. But not all devices will be this way. Some manufacturers will take Android as a base and change what is included, adding some of their own applications and perhaps even changing the look and feel (menu icons, home screen structure, etc.). Others may use Android solely from the open source repository, and while they may ship with the standard look and feel, they will lack the commercial add-on applications.

Figure 13-6. Removing the PlayerUrl column will leave this table in 3NF. Both the ImplementationUrl and the PlayerUrl columns are dependent on the primary key in this table, so it s still in 2NF. But whereas the ImplementationUrl column depends on both WPWFPlayerID and WPWFFormatID columns for context, the PlayerUrl column relies only on the WPWFPlayerID column. This partial dependence is also referred to as transitive

dependence, which means the table isn t in 3NF. The PlayerUrl column should be moved to the Player table for the whole database to be in 3NF. Normalizing a database will make it faster to sort and search through by reducing the chance of redundant data in the database. In particular, the database will need fewer indexes, which will improve the performance of INSERT, UPDATE, and DELETE queries. However, normalization can increase the complexity of joins required to retrieve the data. This, in some cases, may hinder performance. Sometimes, databases are denormalized to reduce the complexity of joins and to get quicker query response times (one of the reasons why fourth and fifth normal forms aren t often used). As always, you need to strike a balance between flexibility and speed. This is just another juggling act you ll encounter as you implement the Web site.

h> int main (int argc, char *argv[]) { printf ("hello world\n"); return 0; } Then say you change the hello world string to Hello World, and before checking in your changes you update your working copy and find that someone else has already changed that line of the file The copy of helloc in your working copy will end up looking something like this: #include <stdioh> int main (int argc, char *argv[]) { <<<<<<< mine.

Even today, some devices have a different mix of applications based on where they are distributed. US recipients of the T-Mobile G1 have an Amazon MP3 store application; not all international recipients do. If your application is independent of all of this, then it should run anywhere. However, if your application code or documentation assumes the existence of Google Maps, Gmail, Amazon MP3 store, and the like, you may run into trouble. Be certain to test your application thoroughly in environments where these applications are not available.

Normalization is a great tool for laying the groundwork in your database design, but just because your tables are all in 3NF doesn t mean you ve modeled the data the best you can for the Web site The following are a few more database design considerations Naming: The database server doesn t care how tables and columns are named as long as they re identified unambiguously in SQL queries However, for your own benefit, you should try to name them all sensibly and uniquely, as you did in the sample database You only have to look at the number of columns that could be called ID in the sample database to see that it s always a good idea to give them all unique names so you don t get confused as you write your code.

Most of the items noted in the previous section focused on hardware changes. Now, let s examine some ways in which Android can cause difficulty to you when the operating system itself changes.