drmplayer.java

MAPI手机多媒体播放的例子

package com.nokia.example.mmapi.mediasampler.model;

import java.io.IOException;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.media.Manager;
import javax.microedition.media.MediaException;
import javax.microedition.media.Player;
import javax.microedition.media.PlayerListener;

import com.nokia.example.mmapi.mediasampler.MediaSamplerMIDlet;
import com.nokia.example.mmapi.mediasampler.viewer.MediaList;

/**
 * Player with DRM protected audio.
 */
public class DRMPlayer implements CommandListener, PlayerListener
{
    private Player player;

    private MediaSamplerMIDlet midlet;

    private final Command stopCommand;

    private MediaList list;

    public DRMPlayer(MediaSamplerMIDlet midlet, MediaList list)
    {
        this.midlet = midlet;
        this.list = list;

        stopCommand = new Command("Stop", Command.ITEM, 2);
    }

    /**
     * Releases resources
     * 
     */
    public void releaseResources()
    {
        discardPlayer();
    }

    public void commandAction(Command cmd, Displayable disp)
    {
        if (cmd == stopCommand)
        {
            discardPlayer();
        }
    }

    public void playerUpdate(final Player p, final String event,
            final Object eventData)
    {
        // queue a call to updateEvent in the user interface event queue
        Display display = Display.getDisplay(midlet);
        display.callSerially(new Runnable()
        {
            public void run()
            {
                DRMPlayer.this.updateEvent(p, event, eventData);
            }
        });
    }

    public void stop()
    {
        if (player != null)
        {
            player.close();
        }
    }

    // Called in case of exception to make sure invalid players are closed
    private void discardPlayer()
    {
        if (player != null)
        {
            player.close();
            player = null;
        }
        list.removeCommand(stopCommand);
    }

    private void updateEvent(Player p, String event, Object eventData)
    {
        if (event == END_OF_MEDIA)
        {
            discardPlayer();
        }
        else if (event == CLOSED)
        {
            player = null;
            list.removeCommand(stopCommand);
        }
    }

    public void playDRMprotected(String file, String type)
    {
        if (file == null)
        {
            midlet.alertError("No file specified for type " + type);
        }
        else
        {
            try
            {
                player = Manager.createPlayer(file);
                player.addPlayerListener(this);
                player.realize();
                player.start();
                list.addCommand(stopCommand);
            }
            catch (IllegalArgumentException iae)
            {
                discardPlayer();
                midlet.alertError("IllegalArgumentException: "
                        + iae.getMessage() + " file: " + file);
            }
            catch (IOException ioe)
            {
                discardPlayer();
                midlet.alertError("IOException: " + ioe.getMessage()
                        + " file: " + file);
            }
            catch (MediaException me)
            {
                discardPlayer();
                midlet.alertError("MediaException: " + me.getMessage()
                        + " file: " + file);
            }
            catch (SecurityException se)
            {
                discardPlayer();
                midlet.alertError("SecurityException: " + se.getMessage()
                        + " file: " + file);
            }
        }
    }
}