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In this plug-in, the form field name used to upload the file is passed to the function in $name, which is used in place of 'file' as shown earlier To check whether a file was successfully uploaded, the first thing the plug-in does is see whether $_FILES[$name]['name'] has a value If so, a file has been uploaded Otherwise, an error value of 1 is returned Next the $filetypes array of allowable file (or mime) types is compared with the type in $_FILES[$name]['type'], using the in_array() function If it isn t one of the allowed types, then the plug-in returns a value of 2 Then, the maximum allowed file length in $maxlen is compared with $_FILES[$name] ['size'], and if the file is too large, an error value of 3 is returned After this, $_FILES [$name]['error'] is tested, and if it has a value greater than 0, an error was encountered and the proper error value is returned

As we discussed in the previous section, you can use a raw socket to transfer IP data to and from a server with Android. This approach is an important one to be aware of so that you know you have that option and understand a bit about the underlying details. Nevertheless, you might want to avoid this technique when possible, and instead take advantage of existing server products to send your data. The most common way to do this is to use a web server and leverage HTTP. Now we re going to take a look at making HTTP requests from an Android client and sending them to an HTTP server. We ll let the HTTP server handle all the socket details, and we ll focus on our client Android application. The HTTP protocol itself is fairly involved. If you re unfamiliar with it or want the complete details, information is readily available via Requests for Comments (RFCs) (such as for version 1.1: http://www.w3.org/Protocols/rfc2616/rfc2616.html). The short story is that the protocol is stateless and involves several different methods that allow users to make requests to servers, and those servers return responses. The entire web is, of course, based on HTTP. Beyond the most basic concepts, there are ways to pass data into and out of requests and responses and to authenticate with servers.

1:

In order to implement serial data reception in the background, the 20X2 s hsersetup command must be properly configured The complete syntax for the command is hsersetup baud_setup, mode, where baud_setup specifies the baud rate and mode configures the available special functions

Here we re going to use some of the most common methods and concepts to talk to network resources from Android applications. To begin, we ll retrieve data using HTTP GET requests to a simple HTML page, using the standard java.net API. From there, we ll look at using the Android-included Apache HttpClient API. After we use HttpClient directly to get a feel for it, we ll also make a helper class, HttpRequestHelper, that you can use to simplify the process and encapsulate the details. This class and the Apache networking API in general has a few advantages over rolling your own networking with java.net, as you ll see. When the helper class is in place, we ll use it to make additional HTTP and HTTPS requests, both GET and POST, and we ll look at basic authentication. Our first HTTP request will be an HTTP GET call using an HttpUrlConnection.

FIGURE 1-5

The most basic HTTP request method is GET. In this type of request, any data that s sent is embedded in the URL, using the query string. The next class in our NetworkExplorer application, which is shown in the following listing, has an Activity that demonstrates the GET request method.

bit0: Receive serial data to the scratchpad in the background (1 automatic serial reception in the background/hserin command not used; 0 reception via hserin command only/no automatic serial reception)

public class SimpleGet extends Activity { . . . other portions of onCreate omitted for brevity this.getButton.setOnClickListener(new OnClickListener() { public void onClick(View v) { Invoke getHttpResponse getOutput.setText(""); method String output = getHttpResponse(getInput.getText().toString()); if (output != null) { getOutput.setText(output); } } }); }; . . . private String getHttpResponse(String location) { String result = null; URL url = null; Construct try { URL object url = new URL(location);

FIGURE 1-6

} catch (MalformedURLException e) { // log and or handle } if (url != null) { Open connection using try { HttpURLConnection HttpURLConnection urlConn = (HttpURLConnection) url.openConnection(); BufferedReader in = new BufferedReader( new InputStreamReader(