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You will see in this section how these URIs translate to underlying database-access mechanisms. Any application on the device can make use of these URIs to access and manipulate data. As a consequence, content providers play a significant role in sharing data between applications. Strictly speaking, though, the content providers responsibilities comprise more of an encapsulation mechanism than a data-access mechanism. You ll need an actual dataaccess mechanism such as SQLite or network access to get to the underlying data sources. So, content-provider abstraction is required only if you want to share data externally or between applications. For internal data access, an application can use any data storage/access mechanism that it deems suitable, such as the following: Preferences: A set of key/value pairs that you can persist to store application preferences Files: Files internal to applications, which you can store on a removable storage medium SQLite: SQLite databases, each of which is private to the package that creates that database Network: A mechanism that lets you retrieve or store data externally through the Internet NOTE: Despite the number of data-access mechanisms allowed in Android, this chapter focuses on SQLite and the content-provider abstraction because content providers form the basis of data sharing, which is much more common in the Android framework compared to other UI frameworks. We ll cover the network approach in 8 and the preferences mechanism in 11.

Making an HTTP POST call is very similar to making an HTTP GET call (see Listing 8 3).

SOURCES = spam.mll spam_server.ml client_app.ml RESULT = client all: native-code PACKS: unix -include /opt/godi/share/OCamlMakefile This code builds an executable, which can be used to query and update the server. The command-line client can be used alongside other clients without interfering. It produces the following output (assuming that the server is running): josh@sputnik ~/de-spam $ ./client -query hello -server 192.168.1.26 -port 8889 hello is 0.010000 spam

Listing 8 3. Making an HTTP POST Request with the HttpClient import java.util.ArrayList; import java.util.List; import org.apache.http.HttpResponse;

Summary

org.apache.http.NameValuePair; org.apache.http.client.HttpClient; org.apache.http.client.entity.UrlEncodedFormEntity; org.apache.http.client.methods.HttpPost; org.apache.http.impl.client.DefaultHttpClient; org.apache.http.message.BasicNameValuePair;

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This chapter covered a lot of ground. It introduced network communication and showed a select-based socket server. This chapter is also one of the more practical examples of modules and code reuse you have been given. The fact that the scoring function could be integrated so easily is a testament to the power and flexibility of the OCaml module section. 16 covers ocamllex and ocamlyacc. These tools give access to regular expressions and a powerful typesafe parsing environment. They can be used to tackle problems as diverse as log file parsing to language construction. In fact, OCaml (and all meta-language [ML] family languages) have a lot of features that make writing compilers easier.

public class TestHttpPost { public String executeHttpPost() throws Exception { BufferedReader in = null; try { HttpClient client = new DefaultHttpClient(); HttpPost request = new HttpPost( "http://somewebsite/WS2/Upload.aspx"); List<NameValuePair> postParameters = new ArrayList<NameValuePair>(); postParameters.add(new BasicNameValuePair("one", "valueGoesHere")); UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity( postParameters); request.setEntity(formEntity); HttpResponse response = client.execute(request); in = new BufferedReader(new InputStreamReader(response.getEntity() .getContent())); StringBuffer sb = new StringBuffer(""); String line = ""; String NL = System.getProperty("line.separator"); while ((line = in.readLine()) != null) { sb.append(line + NL); } in.close(); String result = sb.toString(); return result; } finally { if (in != null) { try { in.close(); } catch (IOException e) { e.printStackTrace(); } } } } }

You now have a thorough understanding of Android menus and dialogs, which are key components of UI programming. You learned how to work with the various kinds of menus available in Android, including submenus, icon menus, context menus, and alternative menus. You also saw how to work with menus more effectively by using XML menu resources. We presented a test harness for the menus, which you ll find useful not only for testing menus but also for testing other programs you end up writing. Menus provide a simple way to invoke and test new functionality. You also saw that dialogs present a special challenge in Android. We showed you the implications of asynchronous dialogs and presented an abstraction to simplify the managed dialogs. The knowledge you gained in this chapter and in the previous chapter on UI controls should give you a good foundation for writing your own complex UI programs. This foundation should also serve you well in preparation for the next chapter on animation.

To make an HTTP POST call with the HttpClient, you have to call the execute() method of the HttpClient with an instance of HttpPost. When making HTTP POST calls, you generally pass URL-encoded name/value form parameters as part of the HTTP request. To do this with the HttpClient, you have to create a list that contains instances of NameValuePair objects and then wrap that list with a UrlEncodedFormEntity object. The NameValuePair wraps a name/value combination and the UrlEncodedFormEntity class knows how to encode a list of NameValuePair objects suitable for HTTP calls (generally

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