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If you decide to pass an API key to an AJAX API, the REFERER must be set to the same URL that you used to create the API key, or some sub-page of that URL. Otherwise, you will not get results back. For the rest of this section, we will help you build an application that calls the Google AJAX Language API directly. Up to this point in the book, we ve shown you all the individual components you need to get translations into your application. Now we ll bring them all together. For this example, we re going to create an application with an EditText for the input, use spinners to select the languages to translate to and from, a read-only EditText for the translated output, invoke a service over the Internet, and use a service to isolate the UI from logic that might take a while to succeed. One of the extras we need to include in this application is the Jakarta Commons Lang project, specifically to unescape XML entity codes into Unicodes for display. We ll cover how to do that too. Refer to Listing 15 5 for the XML layout, and Figure 15 4 to see what it looks like. Other listings will follow to flesh out the entire application. While it may seem like a lot of code here in this chapter, it s really not that much if you consider the functionality you are getting. (Also, you ve seen everything in this example before in earlier chapters, from setting up a service to using spinners as drop-down menus.)

Radio-button controls are an integral part of any UI toolkit. A radio button gives the user several choices and forces her to select a single item. To enforce this single-selection model, radio buttons generally belong to a group and each group is forced to have only one item selected at a time. To create a group of radio buttons in Android, first create a RadioGroup and then populate the group with radio buttons. Listing 4-15 and Figure 4-5 show an example. Listing 4-15. Using Android Radio-Button Widgets <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <RadioGroup android:layout_width="wrap_content" android:layout_height="wrap_content"> <RadioButton android:id="@+id/chRBtn" android:text="Chicken" android:layout_width="wrap_content" android:layout_height="wrap_content"/> android:id="@+id/fishRBtn" android:text="Fish" android:layout_width="wrap_content" android:layout_height="wrap_content"/>

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The high-level functions offer a much easier way to create client and server socket connections. The client socket functions are available on all platforms. Good clients should also remember to use the shutdown_connection function when closing down the connection. Sockets have the same issue with garbage collection and closing that normal files do. You must explicitly close sockets or you will leak file descriptors. The creation of servers is also made much simpler by the high-level functions, although only if you are on a Unix or Unix-like system. The reason it is not implemented on Windows is because it creates a forking server. On Windows you should use threads instead of creating new processes. So you must use some of the lower-level functions directly. The good news is that you have to write this code only once. (Later chapters cover the creation of servers in much more depth, as well as other network programming topics.)

Listing 15 5. XML Layout to Implement a Translation Demonstration < xml version="1.0" encoding="utf-8" > <!-- This file is /res/layout/main.xml --> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_height="fill_parent" android:layout_width="fill_parent"> <EditText android:id="@+id/input" android:hint="@string/input" android:layout_height="wrap_content" android:layout_width="fill_parent" /> <Spinner android:id="@+id/from" android:layout_weight="1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/input" android:prompt="@string/prompt" /> <Button android:id="@+id/translateBtn" android:text="@string/translateBtn" android:layout_weight="1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/input" android:layout_toRightOf="@id/from" android:enabled="false" /> <Spinner android:id="@+id/to" android:layout_weight="1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/input" android:layout_toRightOf="@id/translateBtn" android:prompt="@string/prompt" /> <EditText android:id="@+id/translation" android:hint="@string/translation" android:layout_height="wrap_content" android:layout_width="fill_parent" android:editable="false" android:layout_below="@id/from" /> <TextView android:id="@+id/poweredBy" android:text="powered by Google" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentBottom="true" /> </RelativeLayout>

Our layout is fairly straightforward. We set up fields for the text, what we re translating from and what we re translating to. We also set up spinners as drop-down menus for the language choices from and to. We of course need a button to initiate the translation and, finally, we need the powered by Google string which we anchor to the bottom of the screen (more on why we need to show this string later). Listing 15 6 shows the strings.xml and the arrays.xml files which are used to set up the strings in our user interface and menus.

<RadioButton android:id="@+id/stkRBtn" android:text="Steak" android:layout_width="wrap_content" android:layout_height="wrap_content"/>

Although most of the functions for I/O work transparently across all platforms that OCaml supports, some do not. The main differences exist between Windows platforms and Unix (and Unix-like) platforms. One of the biggest things missing from Windows is the capability to run select on files other than sockets. Another issue is that you need to take the file type into consideration via the open_in_binary or open_in_text functions. If you are writing cross-platform code, you need to pay close attention to this issue.

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