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Android applications and mobile applications in general are small apps with a lot of functionality. One of the ways that mobile apps deliver such rich functionality on such a small device is that they pull information from various sources. For example, the TMobile G1 comes with the Maps application, which provides seemingly sophisticated mapping functionality. We, however, know that the application is integrated with Google Maps and other services, which provide most of the sophistication. That said, it is likely that the applications you write will also leverage information from other applications. A common integration strategy is to use HTTP. For example, you might have a Java servlet available on the Internet that provides services you want to leverage from one of your Android applications. How do you do that with Android Interestingly, the Android SDK ships with Apache s HttpClient (http://hc.apache.org/httpclient-3.x/), which is universally used within the J2EE space. The Android SDK ships with a version of the HttpClient that has been modified for Android, but the APIs are very similar to the APIs in the J2EE version.

Figure 5-5. A simple prompt dialog After writing all this code, however, you will notice that the prompt dialog always returns null even if the user enters text into it. As it turns out, in the following code ad.show() //dialog.show return pl.getPromptReply(); // listener.getpromptReply() the show() method will invoke the dialog asynchronously. This means the getPromptReply() method gets called for the prompt value before the user has time to enter text and click the OK button. This fallacy takes us to the heart of the nature of Android dialogs.

The Apache HttpClient is a comprehensive HTTP client. Although it offers full support for the HTTP protocol, you will likely utilize HTTP GET and POST. In this section, we will discuss using the HttpClient to make HTTP GET and HTTP POST calls.

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Here s the general pattern for using the HttpClient: 1. 2. 3. 4. 5. Create an HttpClient (or get an existing reference). Instantiate a new HTTP method, such as PostMethod or GetMethod. Set HTTP parameter names/values. Execute the HTTP call using the HttpClient. Process the HTTP response.

First, a command-line interface to the preceding module is probably a good thing. (** Command Line Utility for Bayesian Spam Library *) (** first we set up some variable that can be changed *) let spamfile = ref "";; let hamfile = ref "";; let input_file = ref stdin;; let training_ham = ref false;; let training_spam = ref false;; (** our simple usage message *) let usage_msg = "spam [-spam <SPAMFILE>|-ham <HAMFILE>] [-t TESTFILE] [-v (verbose mode)]";;

As we ve mentioned, displaying dialogs in Android is an asynchronous process. Once a dialog is shown, the main thread that invoked the dialog returns and continues to process the rest of the code. This doesn t mean that the dialog isn t modal. The dialog is still modal. The mouse clicks apply only to the dialog, while the parent activity goes back to its message loop. On some windowing systems, modal dialogs behave a bit differently. The caller is blocked until the user provides a response through the dialog. (This block can be a virtual block instead of a real block.) On the Windows operating system, the message-dispatching thread starts dispatching to the dialog and suspends dispatching to the parent window. When the dialog closes, the thread returns to the parent window. This makes the call synchronous.

Listing 8 1 shows how to execute an HTTP GET using the HttpClient. NOTE: Because the code attempts to use the Internet, you will need to add android.permission.INTERNET to your manifest file when making HTTP calls using the HttpClient.

Listing 8 1. Using the HttpClient to Get an HTTP GET Request import import import import import import import import java.io.BufferedReader; java.io.IOException; java.io.InputStreamReader; java.net.URI; org.apache.http.HttpResponse; org.apache.http.client.HttpClient; org.apache.http.client.methods.HttpGet; org.apache.http.impl.client.DefaultHttpClient;

(** Here we use the arg module to parse the command line and set the appropriate variables *) let _ = Arg.parse [

Such an approach might not work for a handheld device, where unexpected events on the device are more frequent and the main thread needs to respond to those events. To accomplish this level of responsiveness, Android returns the main thread to its message loop right away. The implication of this model is that you cannot have a simple dialog where you ask for a response and wait for it before moving on. In fact, your programming model for dialogs must differ in its incorporation of callbacks.

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