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let string_map str fnc = let rec strmap st acc = match st with "" -> Listrev acc | _ -> strmap (Stringsub st 1 ((Stringlength st) - 1)) ((fnc st[0]) :: acc) in strmap str [];; The next function, output_lines, does the heavy lifting for the outputting of a binary file This function reads in a binary file 16 bytes at a time, applies the preceding functions to that data, and outputs the three-column representation you want There is some extra code that handles the last line in the file (when the last read is smaller than 16 bytes), too..

The telephony APIs also include the telephony manager (android.telephony.TelephonyManager), which you can use to obtain information about the telephony services on the device, get subscriber information, and register for telephony state changes. A common telephony use case requires that an application execute business logic upon incoming phone calls. For example, a music player might pause itself for an incoming call, and resume when the call has been completed. So in this section, we are going to show you how to register for telephony state changes and how to detect incoming phone calls. Listing 9 13 shows the details.

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Figure 13-3. Viewing the list of live folders available If you click this New live folder, Android creates an icon on the home page representing the live folder. In our example, the name of this folder will be Contacts LF, short for Contacts Live Folder (see Figure 13-4). This live folder will display contacts from the contacts database. (We ll discuss how to name this folder later, when we describe the AllContactsLiveFolderCreatorActivity class shown in Listing 13-13.) You will learn in the next section that an activity is responsible for creating the Contacts LF folder. For now, as far as the user experience is concerned, you can click the Contacts LF icon to see a list of contacts displayed in a ListView (see Figure 13-5).

Listing 9 13. Using the Telephony Manager public class TelephonyServiceDemo extends Activity { private static final String TAG="TelephonyServiceDemo"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); TelephonyManager teleMgr = (TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE); teleMgr.listen(new MyPhoneStateListener(), PhoneStateListener.LISTEN_CALL_STATE); } class MyPhoneStateListener extends PhoneStateListener {

let rec output_lines fle f_buf s_buf curpos = let str_buf = String.create 16 in let res = input fle str_buf 0 16 in ( if (res < 16) then (List.iter (conditional_add_st f_buf) (string_map (String.sub str_buf 0 res) make_hex); List.iter (Buffer.add_char s_buf) (string_map (String.sub str_buf 0 res ) make_printable)) else (List.iter (conditional_add_st f_buf) (string_map str_buf make_hex); List.iter (Buffer.add_char s_buf) (string_map str_buf make_printable)) ); Printf.printf "%0.7x: %-40s %s\n" curpos (Buffer.contents f_buf) (Buffer.contents s_buf); if (res < 16) then exit(0) else Buffer.clear f_buf; Buffer.clear s_buf; output_lines fle f_buf s_buf (curpos + res);; let output_file fname = let fo = open_in_bin fname in let res = output_lines fo (Buffer.create 16) (Buffer.create 16) 0 in close_in fo;res;; This library also rebuilds a file from a dump. To do this, you do the opposite of what was done before. However, you don t have to use a lot of the data in the dump file to rebuild the file. Basically, only the middle column of data (the hex data) is important to rebuild the file. Converting from the hex chars to binary data is more complicated than the reverse, but this is not something that people do very often. You have also defined a utility function to convert each line into a list of chars, which you then write to the file. let rec build_char_list sb acc = let nval = try Some (Scanf.bscanf sb "%2x" (fun x -> Char.chr x)) with End_of_file -> None in match nval with Some n -> build_char_list sb (n :: acc) | None -> List.rev acc;;

@Override public void onCallStateChanged(int state, String incomingNumber) { super.onCallStateChanged(state, incomingNumber); switch(state) { case TelephonyManager.CALL_STATE_IDLE: Log.d(TAG, "call state idle...incoming number is["+ incomingNumber+"]");break; case TelephonyManager.CALL_STATE_RINGING: Log.d(TAG, "call state ringing...incoming number is["+ incomingNumber+"]");break; case TelephonyManager.CALL_STATE_OFFHOOK: Log.d(TAG, "call state Offhook...incoming number is["+ incomingNumber+"]");break; default: Log.d(TAG, "call state ["+state+"]incoming number is["+ incomingNumber+"]");break; } } } }

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