jump.java

j2me的一个手机游戏

package  net.frog_parrot.jump;

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

public class Jump extends MIDlet implements CommandListener
{
	private Command myExitCommand = new Command("Exit", Command.EXIT,99);
	private Command myGoCommand = new Command("Go", Command.SCREEN,1);
	private Command myNewCommand = new Command("Play Again",Command.SCREEN,1);

	JumpCanvas myCanvas;
	
	GameThread myGameThread;

	public Jump()
	{
		myCanvas = new JumpCanvas(this);
		myCanvas.addCommand(myExitCommand);
		myCanvas.addCommand(myGoCommand);
		myCanvas.setCommandListener(this);
		
	}

	void setGoCommand()
	{
		myCanvas.removeCommand(myPauseCommand);
		myCanvas.removeCommand(myNewCommand);
		myCanvas.addCommand(myGoCommand);
	}

	void setPauseCommand()
	{
		myCanvas.removeCommand(myNewCommand);
		myCanvas.removeCommand(myGoCommand);
		myCanvas.addCommand(myPauseCommand);
	}

	public void startApp() throws MIDletStateChangeException
	{
		myGameThread = new GameThread(myCanvas);
		myGameThread.start();
	}

	public void destroyApp(boolean unconditional) throws MIDletStateChangeException
	{
		myGameThread.requestStop();
		myGameThread = null;
		myCanvas = null;
		System.gc();
	}

	public void pauseApp()
	{
		setGoCommand();
		myGameThread.pause();
	}

	public void commandAction(Command c,Displayable s)
	{
		if(c == myGoCommand)
		{
			myCanvas.removeCommand(myGoCommand);
			myCanvas.addCommand(myPauseCommand);
			myGameThread.go();
		}
		else if(c == myPauseCommand)
		{	
			myCanvas.removeCommand(myPauseCommand);
			myCanvas.addCommand(myGoCommand);
			myGameThread.go();
		}
		else if(c == myNewCommand)
		{
			myCanvas.removeCommand(myNewCommand);
			myCanvas.addCommand(myGoCommand);
			myGameThread = new GameThread(myCanvas);
			System.gc();
			myCanvas.reset();
		}
		else if(c == myExitCommand)
		{	
			try
			{
				destroyApp(false);	
				notifyDestroyed();
			}
			catch(MIDletStateChangeException ex)
			{}
		}
	}
	
}