fileform.java

这是一个Java编写的手机象棋游戏

import javax.microedition.lcdui.*;
import javax.microedition.rms.*;

public class FileForm extends Form implements CommandListener,ItemCommandListener
{
	//固定命令
	private Command	exit, add;
	//Item命令
	private Command	del, delAll;
	//
	private MainSelect mainSelect;
	private String[]	musicPath, musicName;

	public FileForm(MainSelect ms)
	{
		super("背景音乐设置");
		mainSelect = ms;
		exit=new Command("退出",Command.EXIT,1);
		add=new Command("添加",Command.OK,1);
		del=new Command("删除",Command.OK,1);
		delAll=new Command("删除全部",Command.OK,1);
		setCommandListener(this);
		addCommand(exit);
		addCommand(add);
		getMusicList();
	}
	public void commandAction(Command com, Displayable dis)
	{
		if(com == exit)
			Chess.dis.setCurrent(mainSelect);
		if(com == add)
		{
			FileListForm form = null;
			try
			{
				form = new FileListForm(0, this);
			}
			catch(SecurityException se)
			{
				Alert alert=new Alert("Message","当前的安全设置不允许使用文件系统操作",null,AlertType.WARNING);
				Chess.dis.setCurrent(alert, this);
				return;
			}
			Chess.dis.setCurrent(form);
		}
	}
	public void commandAction(Command com, Item item)
	{
		if(com == del)
		{
			String text = ((StringItem)item).getText();
			for(int i = 0; i < musicName.length; i++)
			{
				if(musicName[i].equals(text))
					delMusic(i);
			}
		}
		if(com == delAll)
			delAllMusic();
	}
	private void getMusicList()
	{
		//System.out.println("进入getMusicList()方法");
		MusicRecord musicRecord = null;
		try
		{
			musicRecord = new MusicRecord();
		}
		catch(RecordStoreException e)
		{
			Alert alert=new Alert("Message","打开音乐记录时出现异常，请稍后重试",null,AlertType.WARNING);
			Chess.dis.setCurrent(alert, this);
			return;
		}
		//System.out.println("打开记录成功");
		try
		{
			//System.out.println("开始获取musicList");
			musicPath = musicRecord.getMusicList();
			//System.out.println("获取musicList完毕:"+musicPath);
		}
		catch(RecordStoreException rse)
		{
			Alert alert=new Alert("Message","获取音乐列表时出现异常，请稍后重试",null,AlertType.WARNING);
			Chess.dis.setCurrent(alert, this);
			return;
		}
		if(musicPath == null)
			musicPath = new String[0];
		//System.out.println("musicPath的长度是:"+musicPath.length);
		musicName = new String[musicPath.length];
		//处理数据的临时变量
		StringItem musicItem = null;
		int id = 0;
		for(int i = 0; i < musicPath.length; i++)
		{
			id = musicPath[i].lastIndexOf('/');
			musicName[i] = musicPath[i].substring(id + 1);
			musicItem = new StringItem(null, musicName[i], Item.PLAIN);
			musicItem.addCommand(del);
			musicItem.addCommand(delAll);
			musicItem.setItemCommandListener(this);
			append(musicItem);
			//append("\n");
		}
		musicRecord.closeMusicRecord();
	}
	public void addMusic(String path)
	{
		MusicRecord musicRecord = null;
		try
		{
			musicRecord = new MusicRecord();
		}
		catch(RecordStoreException e)
		{
			Alert alert=new Alert("Message","打开音乐记录时出现异常，请稍后重试",null,AlertType.WARNING);
			Chess.dis.setCurrent(alert, this);
			return;
		}
		musicRecord.addMusic(path);
		musicRecord.closeMusicRecord();
		deleteAll();
		getMusicList();
	}
	private void delMusic(int i)
	{
		MusicRecord musicRecord = null;
		try
		{
			musicRecord = new MusicRecord();
		}
		catch(RecordStoreException e)
		{
			Alert alert=new Alert("Message","打开音乐记录时出现异常，请稍后重试",null,AlertType.WARNING);
			Chess.dis.setCurrent(alert, this);
			return;
		}
		musicRecord.delMusic(i);
		musicRecord.closeMusicRecord();
		deleteAll();
		getMusicList();
	}
	private void delAllMusic()
	{
		try
		{
			RecordStore.deleteRecordStore("MusicRecord");
		}
		catch(RecordStoreException e)
		{
			Alert alert=new Alert("Message","删除全部音乐记录时出现异常",null,AlertType.WARNING);
			Chess.dis.setCurrent(alert, this);
			return;
		}
		deleteAll();
	}
}