readingboard.java

本程序用JavaME语言描述了一个运行在手机上的电子书系统

import java.io.IOException;
import java.io.InputStream;
import java.util.Timer;
import java.util.TimerTask;

import javax.microedition.io.Connector;
import javax.microedition.io.file.FileConnection;
import javax.microedition.lcdui.Alert;
import javax.microedition.lcdui.AlertType;
import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.ChoiceGroup;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Font;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.TextBox;
import javax.microedition.lcdui.TextField;


public class ReadingBoard extends Canvas implements CommandListener{
	
	private TxtReader bookReader = null;								//主程序reference
	
	/***********************文本显示页面****************************/
	private static Command autoline = new Command("自动翻转",Command.SCREEN,1);
	private static Command autolineStop = new Command("停止翻转", Command.SCREEN, 1);
	private static Command turnto = new Command("跳转至",Command.SCREEN,2);
	private static Command search = new Command("搜索", Command.SCREEN, 3);
	private static Command newmark = new Command("新建书签",Command.SCREEN,4);
	private static Command entermark = new Command("书签列表",Command.SCREEN,5);
	private static Command newlabel = new Command("新建标注",Command.SCREEN,6);
	private static Command enterlabel = new Command("标注列表",Command.SCREEN,7);
	private static Command instrument = new Command("使用说明",Command.SCREEN,8);
	private static Command back = new Command("返回",Command.BACK,1);
	private static Command goSearch = new Command("开始搜索", Command.SCREEN, 1);
	private static Command fullScreen = new Command("全屏",Command.SCREEN,1);
	
	/***********************自动翻转页面****************************/
	private static Command autostart = new Command("开始翻转", Command.OK, 1);
	private static Command next = new Command("下一步", Command.OK, 1);
	private static Alert error = new Alert("错误输入","",null,AlertType.ERROR);
	private static TextBox tb = null;
	private static boolean isEditMode = false;
	private boolean isRunning = false;
	private Timer timer = new Timer();
	private final String[] lineorpage = {"自动翻行","自动翻页"};
	private ChoiceGroup autolineorpage = null;
	private Form frm = null;
	private int selectIndex = 0;
	
	/***********************标注页面****************************/
	private Command ok_label = new Command("完成标注", Command.SCREEN, 1);
	
	private NoteRecord[] nr_array = null;
	
	/***********************跳转页面****************************/
	private static Command turnstart = new Command("跳转", Command.OK, 1);
	private static TextBox turnbox = null;
	
	/***********************说明页面****************************/
	private static TextBox instrumentbox = null;
	

	private BookMarkList bml = null;									//书签列表
	private NoteRecordList nrl = null;									//标注列表
	
	private int lines = 1;												//总行数

	private int[] linecount;											//每行字数
	
	private int lineUp = 0;											//行页定位器
	
    private String txtPath = null;										//文件路径
    
    private String txtName = null;										//文件标题
    
    private int colorOfBackground = 0x00FFFFFF;						//背景颜色
    private int colorOfChar = 0x00000000;   							//字体颜色
    private int sizeOfChar = Font.SIZE_MEDIUM;                         //字体大小
    private int styleOfChar = Font.STYLE_PLAIN;                        //字体形状

    private int clipwidth;												//屏宽
    private int clipheight;											//屏高
    
    private Font font = Font.getDefaultFont();
    private int charheight = font.getHeight();									    //字高
    private int charwidth = font.stringWidth("我");									    //字宽
    
    private int pagelines = 0;											//页面行数
    
    private String txt; 												//文本内容
    private String encode = "GB2312";                                  //字符编码
    
    private TextBox strBox = new TextBox("输入搜索内容", "", 256, TextField.ANY);//字串输入框
    
    private boolean isFullMode = false;
    
    //构造方法
    public ReadingBoard(TxtReader tr){
    	bookReader = tr;
    	
    	//获取手机屏幕尺寸参数
    	clipwidth = this.getWidth();
    	clipheight = this.getHeight();
    	pagelines = clipheight / charheight;
    	
    	this.addCommand(fullScreen);
    	this.addCommand(autoline);
    	this.addCommand(turnto);
    	this.addCommand(newmark);
    	this.addCommand(entermark);
    	this.addCommand(newlabel);
    	this.addCommand(enterlabel);
    	this.addCommand(instrument);
    	this.addCommand(back);
    	this.addCommand(search);
    	this.setCommandListener(this);
    	strBox.addCommand(goSearch);
		strBox.addCommand(back);
		strBox.setCommandListener(this);
    }
    
    public boolean selectFile(String path, boolean isGoByMark){							//打开路径为path的文本文件
    	this.txtPath = path;
    	this.txtName = path.substring(path.lastIndexOf('/')+1,path.lastIndexOf('.'));
    	if(txtName.length() > clipwidth / charwidth / 2){
    		this.txtName = txtName.substring(0, clipwidth / charwidth / 2 - 4) + ".."
    		+ txtName.substring(txtName.length()-2,txtName.length());
    	}                                                              //判断标题长度(标题显示问题)
    	this.setTitle(txtName);
    	bml = new BookMarkList(txtName,bookReader);
    	nrl = new NoteRecordList(bookReader, txtName);
		charheight = font.getHeight();									    //字高
	    charwidth = font.stringWidth("我");
    	nr_array = nrl.getAll();										//标注列表
    	lines = 1;
    	lineUp = 0;
    	try{
    		FileConnection fc = (FileConnection)Connector.open(txtPath);
    		InputStream open = fc.openInputStream();
    		if (open.markSupported())
    			open.mark(Integer.MAX_VALUE);
    		else
    			throw new IOException();
    		long bytesum = open.skip(Integer.MAX_VALUE);
    		linecount = new int[(int)(bytesum/10)];					//估计每行字符数
    		open.reset();
    		byte[] main = new byte[(int)bytesum];
    		open.read(main,0,(int)bytesum);
    		txt = new String(main, encode); 							//根据读取的字节流编码成字符串
    		open.close();
    		fc.close();
    	}catch(SecurityException se){
    		return false;
    	}catch(IOException e){
    		System.out.println(e.getMessage());
    		return false;
    	}
    	
    	//遍历字符串得到每行字符数
    	int k = clipwidth / charwidth; 									//预设每行的字符数为默认字宽和接近屏宽
		for(int j = 0;j< txt.length();j ++){
			char ch = txt.charAt(j);
			linecount[lines] ++;
			if(ch == '\n'){
	   			lines ++;
	   		}	
			if(txt.charAt(j) == ' ' && linecount[lines] == 1){
				k += 2;          									//如果行首有空格，该行多读2个字符
			}else if(txt.charAt(j) != ' ' && linecount[lines] == 1){
				k = clipwidth / charwidth; 							//否则恢复预设
			}
			if(linecount[lines] >= k && ch != '\n'){
				lines ++;                  
			}
    	}
		
		if (isGoByMark){
			this.goByMark(bml.whenEnter());
		}
    	return true;
    }
    
    public void goByMark(int line){								//跳转到书签位置
		this.lineUp = line;    
		repaint();
	}
    
    private void nextpage(){										//显示下一页
    	lineUp += pagelines;
    	if(lineUp + pagelines > lines) lineUp = lines - pagelines;
    	repaint();
    }
    
    private void nextline(){										//显示下一行
    	lineUp ++;
    	if(lineUp + pagelines > lines) lineUp = lines - pagelines;
    	repaint();
    }
    
    private void frontpage(){										//显示上一页
    	lineUp -= pagelines;
    	if(lineUp <= 0) lineUp = 0;
    	repaint();
    }
    private void frontline(){										//显示上一行
    	lineUp --;
    	if(lineUp <= 0) lineUp = 0;
    	repaint();
    }
    
    private void turnTo(int percentage){							//根据百分比跳转页面位置
    	lineUp = percentage * (lines - pagelines) / 100;
    	repaint();
    }
    
    protected void paint(Graphics g) {
		g.setColor(colorOfBackground); // 设置背景颜色
		g.fillRect(0, 0, g.getClipWidth(), g.getClipHeight()); // 背景填充
		g.setColor(colorOfChar); // 设置字体颜色
		g.setFont(font); // 字体属性
		int lineleft = 0; // 字符串截取标记
		int k = clipwidth / charwidth; // 预设每行的字符数
		pagelines = g.getClipHeight() / charheight; // 重新设定该页行数，为全屏准备
		String output; // 定义较小字宽的字符处理器
		for (int j = 1; j < lineUp; j++) {
			lineleft += linecount[j];
		} // 画布前将字符串截取标记预设
		for (int i = 0; i < pagelines; i++) {
			lineleft += linecount[i + lineUp]; // 截取标记划定值
			int lineright = lineleft + linecount[i + 1 + lineUp];
			String text = txt.substring(lineleft, lineright); // 字符截取
			if (Font.getDefaultFont().stringWidth(text) == k * charwidth) {
				g.drawString(text, 0, charheight * i, Graphics.TOP
						| Graphics.LEFT);// 对满屏宽的直接画出
			} else {
				double wids = 0; // 空格处理器
				for (int j = 0; j < text.length(); j++) {
					if (text.charAt(j) == ' ')
						wids += 0.5; // 空格视为半个字符
					else {
						output = text.substring(j, j + 1); // 逐个截取画出
						g.drawString(output, (int) (charwidth * wids),
								charheight * i, Graphics.TOP | Graphics.LEFT);
						wids++;
					}
				}
			}
		}
		if (isThereNote()) {
			this.setTitle(txtName + "      " + (lineUp / pagelines + 1) + "/"
					+ (lines / pagelines) + " #");
			// 设置标题中的页码及标著符
		} else {
			this.setTitle(txtName + "      " + (lineUp / pagelines + 1) + "/"
					+ (lines / pagelines));
		}
	}
    
    protected void keyPressed(int keyCode) { 							// 响应手机按键
    	switch(getGameAction(keyCode)){
    	case Canvas.DOWN:												// 对应翻行页功能键
    		if (isRunning)
				keyPressed(Canvas.KEY_NUM0);
		     nextline(); 	
	    	 break;
    	case Canvas.UP:
    		if (isRunning)
				keyPressed(Canvas.KEY_NUM0);
	    	 frontline();
	    	 break;
    	case Canvas.LEFT:
    		if (isRunning)
				keyPressed(Canvas.KEY_NUM0);
	    	 frontpage();
	    	 break;
    	case Canvas.RIGHT:
    		if (isRunning)
				keyPressed(Canvas.KEY_NUM0);
		     nextpage();
	    	 break;
    	case Canvas.GAME_A:                                            //NUM1新建书签
       	     addMark();
       	     break;
    	case Canvas.GAME_B:                                            //NUM3新建标注
    		 addNote();
    		 break;
    	case Canvas.GAME_C:                                            //NUM7进入书签列表
    		 Display.getDisplay(bookReader).setCurrent(bml);
    		 break;
    	case Canvas.GAME_D:                                            //NUM9进入标注列表
    		 nrl.showList();
    		 break;
    	case 0:
    		switch (keyCode){											//对应翻行页数字键
    		case Canvas.KEY_NUM2:
    			if (isRunning)                                         //翻行页时阻止自动翻页
    				keyPressed(Canvas.KEY_NUM0);
	    		 frontline();
	             break;
	        case Canvas.KEY_NUM8:
	        	if (isRunning)
    				keyPressed(Canvas.KEY_NUM0);
	    	     nextline(); 	
	             break;
	        case Canvas.KEY_NUM4:
	        	if (isRunning)
    				keyPressed(Canvas.KEY_NUM0);
	        	 frontpage();
	             break;
	        case Canvas.KEY_NUM6:
	        	if (isRunning)
    				keyPressed(Canvas.KEY_NUM0);
	    	     nextpage();
	             break;
	        case Canvas.KEY_NUM0:										//按键0为自动翻页快捷键
	        	if (!isRunning){  										//自动翻页设定