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PIPHP_JS_PostAjaxRequest('ajaxpostphp', 'url=http://mfacebookcom/', documentgetElementById('info')) function PIPHP_JS_PostAjaxRequest(url, params, target) { request = new PIPHP_JS_AjaxRequest() requestonreadystatechange = function() { if (thisreadyState == 4) if (thisstatus == 200) if (thisresponseText != null) targetinnerHTML = thisresponseText // You can remove these two alerts after debugging else alert("Ajax error: No data received") else alert( "Ajax error: " + thisstatusText) } requestopen("POST", url, true) requestsetRequestHeader("Content-type", "application/x-www-form-urlencoded") requestsetRequestHeader("Content-length", paramslength) requestsetRequestHeader("Connection", "close") requestsend(params) } function PIPHP_JS_AjaxRequest() { try { var request = new XMLHttpRequest() } catch(e1) { try { request = new ActiveXObject("Msxml2XMLHTTP") } catch(e2) { try { request = new ActiveXObject("MicrosoftXMLHTTP") } catch(e3) { request = false } } } return request } </script>

A criteria screen where a user enters parameters to search for restaurant reviews A list-of-reviews screen that shows pages of results that match the specified criteria A review-detail page that shows the details for a selected review item

Recall from chapter 1 that a screen is roughly analogous to an Activity, which means you ll need three Activity classes, one for each screen. When complete, the three screens for the RestaurantFinder application will look like what s shown in figure 3.2.

Note that the entire Facebook page is being loaded into the <div>, in the same way as if you had included it within an <iframe> element This is purely an example of how to incorporate such a page, and you do not gain access to the Facebook API using this method Instead a surfer using such an embedded page to log in will be directed straight to the Facebook servers for the remainder of the process To try this example for yourself, type it in and save it as ajaxposthtml You can also download it from the Download link at wwwpluginphpcom After extracting the file plug-ins zip, you will find the example in the location 11/ajaxposthtml However, don t run the file until you also have the PHP part of the equation on the server It s not a large program but it s very important because it s the part of the process that receives requests from the browser and responds to them In this case, it returns a requested web page:

' ============================ Begin Main Program ============================= setfreq m8 dirsC = %00000101 ' LEDs on outputs 2 & 0 do readadc Probe, ADCval select case ADCval case > Hi LEDs = Red case < Lo LEDs = Green else LEDs = Blank endselect loop

Figure 3.2 RestaurantFinder application screenshots, showing three Activitys: ReviewCriteria, ReviewList, and ReviewDetail

What this program does is check whether the variable url has been posted to it, and if so, it loads the page pointed to by the value of url into memory using the function file_get_ contents() It then uses the echo command to return the URL to the calling program in this case, the Ajax call made by the browser This file should be typed in and saved as ajaxpost php, or you can find it in the same folder as the ajaxposthtml program if you download it from the companion web site Of course, your PHP programs are likely to be far more complex than this one, and may return all manner of items to the browser, such as information on available usernames when signing up to a site, or new messages on a social networking site, and so on

image for the emulator to simulate SD cards, and you used the MediaRecorder application to record audio and save it to the SD card. The most consistent characteristic of multimedia programming with Android is that things are changing and maturing! Multimedia support is moving from OpenCORE to Stagefright, with version 2.2 being somewhat of a pivot release where both frameworks share responsibility for delivering multimedia functionality. Writing multimedia applications requires the developer to conduct a bit more work directly on the hardware because the emulated environments don t adequately replicate the hardware capabilities of the handsets. Despite this potential speed-bump in the development process, Android currently offers you everything you need to create rich and compelling media applications. Its focus on supporting industry and open standards guarantees that your applications will have wide support on a variety of phones. In the next chapter, you ll learn all about how to use Android s location services to interact with GPS and maps. By mixing in what you ve learned in this chapter, you ll be able to create your own GPS application that not only provides voice direction, but that even responds to voice commands.