Recording midlet problem

[xaozon]

Im making a midlet that records audio and saves it to phone's file system. I get the application to run in emulator but when in phone i immediately get error Cannot create a DataSource for: null. Here is the code i'm trying to get to work: (i tried to change the file:///test.wav to file:///e:/test.wav but it didn't help. Also i got a version of this code without the save function but it doesn't work in phone either, it just says error.


So here's the code:
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.microedition.media.*;
import javax.microedition.media.control.RecordControl;

public class SaveCapturedAudioMIDlet extends MIDlet
implements CommandListener {

// the display items
private Display display = null;
private Alert alert = null;
private Command exitCommand = null;

// players and controls
private Player capturePlayer = null;
private Player playbackPlayer = null;
private RecordControl rControl = null;

private boolean error = false;

public SaveCapturedAudioMIDlet() {

// create the display
display = Display.getDisplay(this);
alert = new Alert("Message");
alert.setTimeout(Alert.FOREVER);
alert.setString("Capturing for 10 seconds. Say something intelligent!");
exitCommand = new Command("Exit", Command.EXIT, 1);
alert.addCommand(exitCommand);
alert.setCommandListener(this);

try {

// create the capture player
capturePlayer = Manager.createPlayer("capture://audio");

if (capturePlayer != null) {

// if created, realize it
capturePlayer.realize();

// and grab the RecordControl
rControl = (RecordControl)capturePlayer.getControl(
"javax.microedition.media.control.RecordControl");

// set the alert as the current item
display.setCurrent(alert);

// if it is null throw exception
if(rControl == null) throw new Exception("No RecordControl available");

// and set the destination for this captured data
rControl.setRecordLocation("file:///test.wav");

} else {
throw new Exception("Capture Audio Player is not available");
}

} catch(Exception e) {
error(e);
}
}

public void startApp() {

if(error) return;

try {

// first start the corresponding recording player
capturePlayer.start();

// and then start the RecordControl
rControl.startRecord();

// now record for 10 seconds
Thread.sleep(10000);

// stop recording after time is up
rControl.stopRecord();

// commit the recording
rControl.commit();

// stop the Player instance
capturePlayer.stop();

// and close it to release the microphone
capturePlayer.close();

// finally, create a Player instance to playback
// check your device documentation to find out the root.
// The following will work on devices that have the root
// specified as shown
playbackPlayer = Manager.createPlayer("file:///test.wav");

// and start it
playbackPlayer.start();

} catch(Exception e) {
error(e);
}
}

public void pauseApp() {
}

public void destroyApp(boolean unconditional) {
if(capturePlayer != null) capturePlayer.close();
if(playbackPlayer != null) playbackPlayer.close();
}

public void commandAction(Command cmd, Displayable disp) {
if(cmd == exitCommand) {
destroyApp(true);
notifyDestroyed();
}
}

// general purpose error method, displays on screen as well to output
private void error(Exception e) {
alert.setString(e.getMessage());
alert.setTitle("Error");
display.setCurrent(alert);
e.printStackTrace();
error = true;
}
}

[axs]

Take a look at this doc, the MIDP Mobile Media API Developers Guide: http://www.forum.nokia.com/info/sw.n..._1_en.pdf.html

First of all, check if your phone supports audio capturing, by asking the "supports.audio.capture" property from the system.

Then, take a look at this document, the MIDP Mobile Media API Support In Nokia Devices, in order to check if your phone is supporting *.wav capturing: http://www.forum.nokia.com/info/sw.n..._0_en.pdf.html

As far as I remember, the file URL on a real Nokia phone should be "file:///c:/test.wav" (if file is on the phone's internal memory) or "file:///e:/test.wav" (if file is on the memory card).

And finally, take a look at this media capturing article, based on a good book: http://www.awprofessional.com/articl...&seqNum=4&rl=1
Especially on the Capture Audio chapter.

[sreekanthbellur]

xaozon,
you also need to check whether the phone supports PDA API for access to the file system in the phone. This can be done by

boolean FILECHECK = "1.0".equals(System.getProperty("microedition.io.file.FileConnection.version");