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When working with the telephony manager, be sure to add the <uses-permission android:name="android.permission.READ_PHONE_STATE" /> permission to your manifest file so you can access phone-state information. As shown in Listing 9 13, you get notified about phone-state changes by implementing a PhoneStateListener and calling the listen() method of the TelephonyManager. When a phone call arrives, or the phone state changes, the system will call your PhoneStateListener s onCallStateChanged() method with the new state and the incoming phone number. In the case of an incoming call, you look for the CALL_STATE_RINGING state. You write a debug message to the log file in this example, but your application could implement custom business logic in its place. To emulate incoming phone calls, you can use Eclipse s Emulator Control UI, as you did with SMS messages (see Figure 9 8). When dealing with phone-state changes, you might also need to get the subscriber s (user s) phone number. TelephonyManager.getLine1Number() will return that for you.

Figure 13-5. Showing live-folder contacts Depending on the number of contacts you have, this list might look different. You can click one of the contacts to display its details (see Figure 13-6).

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let rec input_lines source_chan dest_chan = let write_line sc dc = try let istr = String.sub (input_line sc) 9 39 in let buf = Buffer.create 32 in String.iter (fun x -> match x with ' ' -> () | _ -> Buffer.add_char buf x) istr; let scanbuf = Scanf.Scanning.from_string (Buffer.contents buf) in let vals = build_char_list scanbuf [] in List.iter (fun x -> output_char dc x) vals; true with End_of_file -> false in let do_more = write_line source_chan dest_chan in match do_more with true -> input_lines source_chan dest_chan | false -> ();; let input_file source_file dest_file = let ic = open_in_bin source_file in let oc = open_out_bin dest_file in input_lines ic oc; close_in ic; close_out oc;; This code can be compiled like any other OCaml module. You can even create a command-line program using this module so the implementation of the original program is complete (this code would be saved into a file called xxd_command.ml). let usage = (Printf.sprintf "%s <FILENAME>\n" Sys.argv.(0)) ^ "\nDump or unDump an xxd style hexdump\n";; let _ = try if (Array.length Sys.argv) < 2 then try while (true) do Xxd.output_lines stdin (Buffer.create 16) (Buffer.create 16) 0 done with End_of_file -> () else Arg.parse [ ("-r",Arg.String (fun x -> Xxd.input_file x (x ^ ".rebuilt")), "Build a Binary file from a hexdump")] (fun x -> Xxd.output_file x) usage with unexpected_exn -> print_string (Printexc.to_string unexpected_exn); print_string ("\n" ^ usage);;

Summary

In this chapter, we talked about the Android media framework and the telephony APIs. With respect to media, we showed you how to play audio and video. We also showed you how to record audio and video, both directly and via intents. In the second part of the chapter, we talked about telephony services in Android. Specifically, we showed you how to send text messages and how to monitor incoming text messages. We also showed you how to access the various SMS folders on the device. We concluded with a discussion of the TelephonyManager class. In the next chapter, we are going to turn our attention to 3D graphics by discussing how to use OpenGL with your Android applications.

Figure 13-6. Opening a live-folder contact You can click the Menu button at the bottom to see how you can manipulate that individual contact (see Figure 13-7).

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