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ou might have heard of Lex and Yacc. Lex, the Lexical Analyzer Generator, is a tool that helps you build programs that are built around regular expressions. Yacc, Yet Another Compiler Compiler, is a program for building interpreters and compilers from grammars that you define. Although you do not have to use these tools together (people often use just Lex or Yacc with a custom lexer), but they are often used together. This chapter presents ocamllex and ocamlyacc. You will see examples of how to build applications with both, including a word counting utility, a Reverse Polish Notation (RPN) calculator, and a configuration file language. Ocamllex and ocamlyacc both have syntax that is very similar to Lex and Yacc. These two tools have a long history in the Unix world, and there are several books and web sites dedicated to their use. The good news for OCaml users is that many of the examples and discussion are applicable to ocamllex and ocamlyacc.

POST calls). After you create a UrlEncodedFormEntity, you can set the entity type of the HttpPost to the UrlEncodedFormEntity and then execute the request. In Listing 8 3, we created an HttpClient and then instantiated the HttpPost with the URL of the HTTP endpoint. Next, we will create a list of NameValuePair objects and populate that with a single name/value parameter. We set the name of the parameter to one and the value of the parameter to valueGoesHere. We then create a UrlEncodedFormEntity instance, passing the list of NameValuePairobjects to its constructor. Finally, we call the setEntity() method of the POST request and then execute the request using the HttpClient instance. HTTP POST is actually much more powerful than this. With an HTTP POST, we can pass simple name/value parameters, as shown in Listing 8 3, as well as complex parameters such as files. HTTP POST supports another request-body format known as a multipart POST. With this type of POST, you can send name/value parameters as before, along with arbitrary files. Unfortunately, the version of HttpClient shipped with Android does not directly support multipart POST. To do multipart POST calls, you need to get three additional Apache open source projects: Apache Commons IO, Mime4j, and HttpMime. You can download these projects from the following web sites: Commons IO: http://commons.apache.org/io/ Mime4j: http://james.apache.org/mime4j/ HttpMime: http://hc.apache.org/httpcomponentsclient/httpmime/index.html Alternatively, you can visit this site to download all of the required .jar files to do multipart POST with Android: http://www.apress.com/book/view/1430226595 Listing 8 4 demonstrates a multipart POST using Android.

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he previous chapters should ve given you a solid introduction to UI programming in Android In this chapter, we would like to further strengthen your ability to create intuitive and appealing applications on the Android Platform by covering the animation capabilities of the Android SDK If our experience is any guide, we assert that animation brings a lot of fun to the staid, unanimated world of programming Animation is a process by which an object on a screen changes its color, position, size, or orientation over time Android supports three types of animation: frame-by-frame animation, which occurs when a series of frames is drawn one after the other at regular intervals; layout animation, in which you animate views inside a container view such as lists and tables; and view animation, in which you animate any general-purpose view.

Listing 8 4. Making a Multipart POST Call import java.io.ByteArrayInputStream; import java.io.InputStream; import import import import import import import import org.apache.commons.io.IOUtils; org.apache.http.HttpResponse; org.apache.http.client.HttpClient; org.apache.http.client.methods.HttpPost; org.apache.http.entity.mime.MultipartEntity; org.apache.http.entity.mime.content.InputStreamBody; org.apache.http.entity.mime.content.StringBody; org.apache.http.impl.client.DefaultHttpClient;

import android.app.Activity; public class TestMultipartPost extends Activity { public void executeMultipartPost()throws Exception {

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