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The Xxd module is presented as follows, and this code would be saved into a file called xxdml This code implements a hex dump of any file You can then reverse that hex dump and reconstruct the original file The first function takes a binary data character and converts it into a printable character, if it can A char in OCaml is not always printable In fact, only the chars between decimal value 32 and 126 are printable (that s from the space character to the ~) You also have a function that uses Printf to provide the hex value of a given char That value is always printable After that, you have a function that helps this module output strings the right length Because you are storing three columns in the buffer, this function calculates where the spaces go into the output string.

Listing 9 12 opens the SMS inbox and creates a list in which each item contains the body portion of an SMS message. The layout portion of Listing 9 12 contains a simple TextView that will hold the body of each message in a list item. To get the list of SMS messages, you create a URI pointing to the SMS inbox (content://sms/inbox) and then execute a simple query. You then filter on the body of the SMS message and set the list adapter of the ListActivity. After executing the code from Listing 9 12, you ll see a list of SMS messages in the inbox. Make sure you generate a few SMS messages using the Emulator Control before running the code on the emulator. Because you can access the SMS inbox, you would expect to be able to access other SMS-related folders such as the sent folder or the draft folder. The only difference between accessing the inbox and accessing the other folders is the URI you specify. For example, you can access the sent folder by executing a query against content://sms/sent. Following is the complete list of SMS folders and the URI for each folder: All: content://sms/all Inbox: content://sms/inbox Sent: content://sms/sent Draft: content://sms/draft Outbox: content://sms/outbox Failed: content://sms/failed Queued: content://sms/queued Undelivered: content://sms/undelivered Conversations: content://sms/conversations Android combines MMS and SMS and allows you to access content providers for both at the same time, using an AUTHORITY of mms-sms. Therefore, you can access a URI such as this:

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Now that you ve seen how to send SMS messages in Android, you might assume that you can access similar APIs to send e-mail. Unfortunately, Android does not provide APIs for you to send e-mail. The general consensus is that users don t want an

Figure 13-1. Android 1.5 home page If you long-click this home page, you will see its context menu (see Figure 13-2).

let make_printable i_char = match i_char with n when (((Charcode n) < 32) or ((Charcode n) > 126)) -> '' | _ -> i_char;; let make_hex chr = Printfsprintf "%2x" (Charcode chr);; let conditional_add_st bffr ch = match bffr with n when ((Bufferlength bffr) = 0) -> Bufferadd_string bffr ch | n when ((Bufferlength bffr) = 4) -> Bufferadd_string bffr (" " ^ ch) | n when (((Bufferlength bffr) mod 5) = 4) -> Bufferadd_string bffr (" " ^ ch) | _ -> Bufferadd_string bffr ch;; The next function provides a map function for strings The String module provides only an iteration function, not a map function The function you define applies the function argument to each character in the string You build the result list backward, so you have to reverse it at the end.

application to start sending e-mail on their behalf. Instead, to send e-mail, you have to go through the registered e-mail application. For example, you could use ACTION_SEND to launch the e-mail application:

Intent emailIntent=new Intent(Intent.ACTION_SEND); String subject = "Hi!"; String body = "hello from android...."; String[] extra = new String[]{"aaa@bbb.com"}; emailIntent.putExtra(Intent.EXTRA_EMAIL, extra); emailIntent.putExtra(Intent.EXTRA_SUBJECT, subject); emailIntent.putExtra(Intent.EXTRA_TEXT, body); emailIntent.setType("message/rfc822"); startActivity(emailIntent);

If you click the Folders suboption, Android will open another menu showing any live folders that are available (see Figure 13-3). We will build a live folder in the next section, but for now assume that the live folder we want has already been built. Assume that the live folder we want is called New live folder (see Figure 13-3).

This code launches the default e-mail application and allows the user to decide whether to send the e-mail or not. Other extras that you can add to an email intent include EXTRA_CC and EXTRA_BCC. Now let s talk about the telephony manager.

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