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When you released the Web site, you met all of the client s requirements. However, at some point, clients will find something that doesn t work quite as they wanted and request that you change the functionality. You ll also get requests for new features that weren t part of the original requirements (and you should be able to charge the client for this new work). Whether the change is a small or a large change to the Web site, just as with bug fixes, you must consider the impact on the rest of the Web site. Some changes will be quite minor, requiring very little work in the analysis, design, and implementation stages. Others may be quite fundamental and require large changes to the Web site that can take a considerable amount of time to implement. As with bug fixing, you should always fully test your changes to the Web site. Even a relatively minor change can impact parts of the Web site that you wouldn t expect and cause problems.

When maintaining a Web site, you can stick to the e-mail and post-it note solution, but that can very quickly degenerate into chaos. You need a better way to track issues. Microsoft is planning to release an application that supports issue tracking, Team Foundation Server, as an add-on for Visual Studio. It integrates directly into the Visual Studio IDE, and as well as issue tracking, it also provides a complete source control system and allows the end-to-end tracking of issues (from the issue being raised to the individual code changes to fix the issues). For more information, see http://msdn.microsoft.com/vstudio/teamsystem/team/ default.aspx. Another option for issue tracking is FogBugz, available from http://www.fogbugz.com. Although it doesn t integrate into the Visual Studio IDE, it is a perfectly capable issue-tracking system.

By default, everything in a LinearLayout is left- and top-aligned. So, if you create a row of widgets via a horizontal LinearLayout, the row will start flush on the left side of the screen. If that is not what you want, you need to specify a gravity value. Using android:layout_gravity on a widget (or calling setGravity() at runtime on the widget s Java object), you can tell the widget and its container how to align it in on the screen. For a column of widgets, common gravity values are left, center_horizontal, and right for left-aligned, centered, and right-aligned widgets, respectively. For a row of widgets, the default is for them to be aligned so their text is aligned on the baseline (the invisible line that letters seem to sit on ). You can specify a gravity of center_vertical to center the widgets along the row s vertical midpoint.

In retrospect, that doesn t sound all that simple, so let s review an example (see Listing 8-11) of how to set up the svn.simple and svn.username providers so that the various Subversion APIs can make use of them to determine the user s username and password when needed. Listing 8-11. Using Authentication Providers /* prompt the user for a username and password */ static svn_error_t * simple_prompt_callback (svn_auth_cred_simple_t **cred, void *baton, const char *realm, const char *username, svn_boolean_t may_save, apr_pool_t *pool) { svn_auth_cred_simple_t *ret = apr_pcalloc (pool, sizeof (*ret)); size_t len; char *line; /* tell the user what the repository realm is, so he knows what username he should enter. */ if (realm) printf ("Realm: %s\n", realm); /* if we were passed a username, that means subversion had one cached for this realm already, so use that. */ if (username) ret->username = apr_pstrdup (pool, username); else { /* we didn't have a username, so prompt the user to enter one. */ printf ("Username : "); /* read in the username the user entered */ line = fgetln (stdin, &len); /* assuming the user entered something copy it into our final svn_auth_cred_simple_t structure so we can return it. */ if (line) { ret->username = apr_palloc (pool, len); snprintf (ret->username, len - 1, line); } } /* now we do the same thing for the user's password... */ printf ("Password : ");

Summary

By default, widgets are tightly packed next to each other. If you want to increase the whitespace between widgets, you will want to use the android:padding property (or call setPadding() at runtime on the widget s Java object). The padding specifies how much space there is between the boundaries of the widget s cell and the actual widget contents, as shown in Figure 6-1.

In this chapter, you looked at some of the issues you ll face each time you start a new project. Working with a client on the specifications can be fruitless if you don t have a specific agenda. The more information you have, the more responsive your design can be to the resources you have available and the tasks you re trying to achieve. You can use the three-tier design to make your Web site more flexible and easier to develop. You can iron out more wrinkles in both design and specifications by building prototypes to prove the concept and showing those to the client.