gameeffects.java

--- --- --- -基于蓝牙的J2ME游戏框架---------------很有用的

/***************************************************************************/
// NOTE: before asking any questions on sound i should point you to the
// Includes directory. This is a version of the GameEffectsMIDP2.java file
// from that directory but with the preprocessors cut out. If the sound
// aint working on your mobile then take a look at the original GameEffects
// files in the Includes directory and see if you can figure out why.


import java.io.*;
import javax.microedition.media.*;
import javax.microedition.media.control.*;

class GameEffects
	implements Control
{
    private volatile int currentPriority = 0;
    private volatile int currentPlayer   = 0;
    public static boolean soundOn = false;
    private Player[] pl = new Player[6];
	public boolean isPaused = false;


    GameEffects()
    {
//		String[] str = Manager.getSupportedContentTypes("http");
//		for (int i = 0; i < str.length; i++)
//			System.out.println(str[i]);

		// Setup sound players
		pl[0] = createSoundPlayer("/a.mid", "audio/midi");
		pl[1] = createSoundPlayer("/b.mid", "audio/midi");
		pl[2] = createSoundPlayer("/c.mid", "audio/midi");
		pl[3] = createSoundPlayer("/popn.wav", "audio/x-wav");

    }

    private Player createSoundPlayer(String filename, String format)
    {
        Player p = null;
        try
        {
            InputStream is = getClass().getResourceAsStream(filename);
            p = Manager.createPlayer(is, format);
            p.realize();
        }
        catch (IOException ex)
        {
//System.out.println("IOException "+ex.getMessage());
            // ignore
        }
        catch (MediaException ex)
        {
//System.out.println("MediaException "+ex.getMessage());
            // ignore
        }
        catch (Exception ex)
        {
//System.out.println("Exception "+ex.getMessage());
            // ignore
		}
        return p;
    }

    // Game Effects methods
    private synchronized void setIsPaused(boolean isPaused)
    {
        this.isPaused = isPaused;
    }

    void pause()
   	{
      	setIsPaused(true);
      	stopSound();
	}


    void resume()
    {
        // Note: The 'Game Settings' may change during a pause.
        // In general, one might need to handle that during the resume.
        // But we don't need to do anything to handle that before resuming
        // because any sound or vibration that were in progress just
        // before pausing were cancelled when pause() was called,
        // and any 'Game Settings' changes will take effect after the resume.
        setIsPaused(false);
    }


	public void stopSound()
	{
		if (pl[currentPlayer] != null)
		{
			try
			{
				pl[currentPlayer].stop();
			}
			catch (Exception e)
			{
			}
		}
		currentPriority = 20;
	}

	public boolean soundEnded()
	{
		if (pl[currentPlayer] != null && pl[currentPlayer].getState() == Player.STARTED) return false;
		else return true;
	}

    private void playSound(int priority, Player p, int vol, int loop)
    {
        if (soundOn && !isPaused)
        {
            try
            {
				if ((pl[currentPlayer] == null || (pl[currentPlayer] != null && pl[currentPlayer].getState() != Player.STARTED)) || priority < currentPriority)
				{
					if (pl[currentPlayer] != null /*&& pl[currentPlayer].getState() == Player.STARTED*/)
					{
						pl[currentPlayer].stop();
					}
					p.prefetch();
					p.setLoopCount(loop);
					VolumeControl vc = (VolumeControl)p.getControl("VolumeControl");
					if (vc != null) vc.setLevel(vol);
					p.start();
					currentPriority = priority;
                }
            }
            catch (MediaException ex)
            {
                currentPriority = 0; // allow any new request to play
//System.out.println("MediaException "+ex.getMessage());
            }
        }
    }

    void prefetchPop()
    {
		try
		{
			if (pl[currentPlayer] != null && pl[currentPlayer].getState() == Player.STARTED)
			{
				pl[currentPlayer].stop();
			}
			if (pl[3] != null)
			{
				pl[3].prefetch();
			}
		}
        catch (MediaException ex)
        {
            currentPriority = 0; // allow any new request to play
        }
	}

    void playPop()
    {
		if (pl[3] != null)
		{
			playSound(2, pl[3], 50, 1);
			currentPlayer = 3;
		}
    }

    void playMenu()
    {
		if (pl[0] != null)
		{
	        playSound(3, pl[0], 50, -1);
	        currentPlayer = 0;
		}
    }
    void playEOL()
    {
		if (pl[1] != null)
		{
	        playSound(3, pl[1], 50, 1);
	        currentPlayer = 1;
		}
    }
    void playEOG()
    {
		if (pl[2] != null)
		{
	        playSound(3, pl[2], 50, 1);
	        currentPlayer = 2;
		}
    }
}