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happening, but it s still familiar and powerful. If you need to do a lot of File handling, you ll probably want to create some simple local utilities for wrapping the mundane tasks so you don t have to repeat them over and over again. You might want to use or port something like the Apache commons.io package, which includes a FileUtils class that handles these types of tasks and more. The SD card example completes our exploration of the various ways to store different types of file data on the Android platform. If you have static predefined data, you can use res/raw; if you have XML files, you can use res/xml. You can also work directly with the filesystem by creating, modifying, and retrieving data in files, either in the local internal filesystem or on the SD card, if one is available. A more complex way to deal with data one that supports more robust and specialized ways to persist information is to use a database, which we ll cover in the next section.

In this code segment, the width and height of the table to create are set to the empty string ('') to let the browser choose suitable dimensions Then a background color of dedede and foreground color of 444444 are passed, followed by the string value in $contents, and the program for displaying the GIFs: cornerphp As you can see, HTML can also be passed to the plug-in, so you can place an unlimited variety of contents within these rounded border tables

1

Android conveniently includes a built-in relational database.1 SQLite doesn t have all the features of larger client/server database products, but it includes everything you need for local data storage. At the same time, it s quick and relatively easy to work with. In this section, we ll cover working with the built-in SQLite database system, from creating and querying a database to upgrading and working with the sqlite3 tool available in the adb shell. We ll demonstrate these features by expanding the WeatherReporter application from chapter 4. This application uses a database to store the user s saved locations and persists user preferences for each location. The screenshot shown in figure 5.4 displays the saved data that the user can select from; when the user selects a location, the app retrieves information from the database and shows the corresponding weather report. We ll start by creating WeatherReporter s database.

function PIPHP_RoundedTable($width, $height, $bground, $border, $contents, $program) { if ($width) $width = "width='$width'"; if ($height) $height = "height='$height'"; $t1 $t2 $t3 $t4 $t5 = = = = = "<td width='5'><img src='$program c"; "<td background='$program c"; "<td width='5' background='$program c"; "$border&f=$bground' /></td>"; "<td bgcolor='#$bground'>$contents</td>";

Figure 1-9

In the previous section, we used Android s frame-by-frame animation capabilities to show a series of images in a loop that gives the impression of movement. In this next section, we re going to programmatically animate a globe so that it moves around the screen. To create this animation, we re going to animate a graphics file (a PNG file) with a ball that appears to be bouncing around inside our Android viewing window. We ll create a Thread in which our animation will run, and a Handler that ll help communicate messages back to our program that reflect the changes in the state of our animation. We ll use this same approach in section 9.3 when we talk about Open GL ES. You ll find this approach is useful for creating most complex graphics applications and animations.

return <<<_END <table border='0' cellpadding='0' cellspacing='0' $width $height> <tr>$t1=tl&b=$t4 $t2=t&b=$t4 $t1=tr&b=$t4</tr> <tr>$t3=l&b=$t4 $t5 $t3=r&b=$t4</tr> <tr>$t1=bl&b=$t4 $t2=b&b=$t4 $t1=br&b=$t4</tr></table> _END; }

In this section, we ll look at a simple animation technique that uses an image bound to a sprite. The image moves that sprite around the screen to give the appearance of a bouncing ball. To get started, create a new project called BouncingBall with a BounceActivity. You can copy and paste the code in the following listing for the BounceActivity.java file.