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To get an HTTP response and show the first few lines of it in our SimpleGet class, we call a getHttpResponse method that we ve built B. Within this method, we construct a java.net.URL object C, which takes care of many of the details for us, and then we open a connection to a server using an HttpURLConnection D. We then use a BufferedReader to read data from the connection one line at a time E. Keep in mind that as we re doing this, we re using the same thread as the UI and therefore blocking the UI. This isn t a good idea. We re using the same thread here only to demonstrate the network operation; we ll explain more about how to use a separate thread shortly. After we have the data, we append it to the result String that our method returns F, and we close the reader and the connection. Using the plain and simple java.net support that has been ported to Android this way provides quick and dirty access to HTTP network resources. Communicating with HTTP this way is fairly easy, but it can quickly get cumbersome when you need to do more than just retrieve simple data, and, as noted, the blocking nature of the call is bad form. You could get around some of the problems with this approach on your own by spawning separate threads and keeping track of them and by writing your own small framework/API structure around that concept for each HTTP request, but you don t have to. Fortunately, Android provides another set of APIs in the form of the Apache HttpClient3 library that abstract the java.net classes further and are designed to offer more robust HTTP support and help handle the separate-thread issue.

hserinflag: This is one of the flags contained in the special-function variable flags It s automatically initialized to 0 when the hsersetup statement is executed, and automatically set to 1 as soon as a serial data byte has been received in the background When our program has finished processing the serial data (ie, sending it to the LCD), it must reset hserinflag to 0 in preparation for the next incoming string of data

To get started with HttpClient, we re going to look at using core classes to perform HTTP GET and POST method requests. We re going to concentrate on making network

1:

You ll find more about the Apache HttpClient here: http://hc.apache.org/httpclient-3.x/.

Perhaps the best way to clarify these concepts is with a concrete example Let s assume that our program has already executed the hsersetup, B4800_64, %111 statement that we discussed earlier and, subsequently, the master processor has sent the serial string Hello to the serialized LCD Therefore, the following has automatically occurred in the background: H has been stored in scratchpad location 0, e has been stored in location 1, etc, and hserptr now equals 5 (data has been automatically stored in scratchpad locations 0 through 4, so the next incoming byte will be stored at location 5) Also, hserinflag now equals 1 because a background serial-receive has occurred At this point, the following code snippet could be used to access this data and send it to the LCD:

FIGURE 1-8

requests in a Thread separate from the UI, using a combination of the Apache ResponseHandler and Android Handler (for different but related purposes, as you ll see). The following listing shows our first example of using the HttpClient API.

Here you can tell the installer to install an Apache web server and where to install the Zend server

. . . . private final Handler handler = new Handler() { public void handleMessage(Message msg) { progressDialog.dismiss(); String bundleResult = msg.getData().getString("RESPONSE"); Use Handler output.setText(bundleResult); to update UI } }; Create . . . onCreate omitted for brevity ResponseHandler private void performRequest() { for asynchronous final ResponseHandler<String> responseHandler = HTTP new ResponseHandler<String>() { public String handleResponse(HttpResponse response) { StatusLine status = response.getStatusLine(); HttpEntity entity = response.getEntity(); Get HTTP String result = null; response try { payload result = StringUtils.inputStreamToString(

hserptr: This is the data write pointer It contains the address of the scratchpad location into which the next incoming serial data byte will be written As soon as hsersetup has been properly configured, hserptr is automatically set to 0 so that the first incoming data byte will be stored in scratchpad location 0; next, hserptr is automatically incremented so that the next incoming byte is stored in location 1, and so on ptr: This is the data read pointer It contains the address of the scratchpad location from which the next stored data byte will be read It functions similarly to the bptr variable that is

FIGURE 1-9

entity.getContent()); Message message = handler.obtainMessage(); Bundle bundle = new Bundle(); bundle.putString("RESPONSE", result); message.setData(bundle); handler.sendMessage(message); } catch (IOException e) { // log and or handle } return result; } }; this.progressDialog = ProgressDialog.show(this, "working . . .", Use separate Thread "performing HTTP request"); for HTTP call new Thread() { public void run() { try { DefaultHttpClient client = new DefaultHttpClient(); HttpGet httpMethod = new HttpGet( urlChooser.getSelectedItem().toString()); Create client.execute( HttpGet httpMethod, responseHandler); object } catch (ClientProtocolException e) { Execute // log and or handle HTTP with } catch (IOException e) { HttpClient // log and or handle

} } }.start(); }

' get location of last received byte ' for each received byte ' fetch the character (see below) ' and send it to the LCD ' reset the new data flag

FIGURE 1-10