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length, it may seem complicated, but it actually contains very little code that we haven t already discussed Essentially, the program allows us to change Octavius direction whenever we want, or to stop him and discontinue his exploratory behavior completely All the while, Octavius is continually updating his ultrasonic range-finding data The best part is that the program can be easily modified whenever I add new sensory capabilities to Octavius

method sets up UI private void PopulateScreen() { try { final EditText emailfield = (EditText) findViewById(R.id.emailaddress); final EditText serverurlfield = (EditText)findViewById(R.id.serverurl); emailfield.setText(myprefs.getEmail()); serverurlfield.setText(myprefs.getServer()); } catch Exception e) { }

You can give the counter any name you like, but if you use the txt extension, as in these examples, you ll be able to load it into a text editor and browse through it

This Activity commences by initializing the SharedPreferences instance B, which retrieves the setting s values and subsequently populates the UI elements C by calling the application-defined PopulateScreen method G. When the user clicks the Save Settings button, the onClick method is invoked, wherein the data is extracted from the UI elements D and put back into the Prefs instance E. A call to the finish method F ends this Activity. Once the settings are in order, it s time to focus on the core of the application: managing jobs for our mobile worker. To get the most out the higher-level functionality of downloading (refreshing) and managing jobs, let s examine the core data structures in use in this application.

HailOctaviusbas can also be easily modified to run on our master processor, so if you decide to build your own 20X2-based robot, it would make a great starting point for exploring the word of PICAXE robotics Of course, our Hail, Octavius! project is just the beginning Its main purpose is to provide a framework within which to safely endow a robot with additional sensory/motor functions as he grows and develops We ll discuss some of the many possibilities in the Epilogue, along with what s in store for Octavius as he continues his journey of exploration and development

function PIPHP_HitCounter($filename, $action) { $data = getenv("REMOTE_ADDR") getenv("HTTP_USER_AGENT") "\n"; switch ($action) { case "reset": $fp = fopen($filename, "w"); if (flock($fp, LOCK_EX)) ; flock($fp, LOCK_UN); fclose($fp); return; case "add": $fp = fopen($filename, "a+"); if (flock($fp, LOCK_EX)) fwrite($fp, $data); flock($fp, LOCK_UN); fclose($fp); return; case "get": $fp = fopen($filename, "r"); if (flock($fp, LOCK_EX)) $file = fread($fp, filesize($filename) - 1); flock($fp, LOCK_UN); fclose($fp); $lines = explode("\n", $file); $raw = count($lines); $unique = count(array_unique($lines)); return array($raw, $unique); case "delete": unlink($filename); return; } }

Data structures represent a key element of any software project and, in particular, projects consisting of multiple tiers, such as our field service application. Job data is exchanged between an Android application and the server, so the elements of the job are central to our application. In Java, you implement these data structures as classes, which include helpful methods in addition to the data elements. XML data shows up in many locations in this application, so let s start there.

In a similar way to being able to instantly track visitor hits, this plug-in keeps constant track of the URLs from which your users are being sent Again, this is something you can track with a service such as Google Analytics, or by processing your log files, but neither of these methods is as quick and easy to use as this plug-in for providing instant data, as shown in Figure 5-10

IN ROBOT YEARS, OCTAVIUS IS STILL in his infancy; he s just beginning to toddle about, and he hasn t even learned to talk yet! (Although, as we re about to see, that s high on my list of priorities) Now that I have completed the manuscript for this book, I ve been thinking about some of the capabilities that I would like to add to Octavius The following list comes readily to mind, and I m sure you could easily make several additions to it:

< xml version="1.0" encoding="UTF-8" > <joblist> <job> <id>22</id> <status>OPEN</status> <customer>Big Tristan's Imports</customer> <address>2200 East Cedar Ave</address> <city>Flagstaff</city> <state>AZ</state> <zip>86004</zip> <product>UnwiredTools UTCIS-PT</product> <producturl>http://unwiredtools.com</producturl> <comments>Requires tuning - too rich in the mid range RPM. Download software from website before visiting.</comments> </job> </joblist>