一起来学J2ME_1:撰写一个手机系统属性显示程序 (附jad文件的错误代码)

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目标：撰写一个手机系统属性显示程序SysInfoMIDlet

开发环境：NetBeans4.1

测试机型：Sun DefaultColorPhone

真机型号：Nokia 6030

功能实现：

1.实现手机系统属性的显示

2.能够响应上，下方向键的消息，使属性信息队列能够在屏幕上滚动显示。

3.能够响应左，右方向键的消息，使过长的属性信息能够在屏幕在左右移动，让用户看得见属性信息的全部内容。

4.能够设置显示字体的大小，并根据字体的大小调节行距。

代码如下，注释以后会慢慢加上的：

文件1：SysInfoMIDlet.java

import javax.microedition.midlet.MIDlet; import javax.microedition.lcdui.game.GameCanvas; import javax.microedition.lcdui.*; public class SysInfoCanvas extends GameCanvas implements Runnable, CommandListener { Display display; Font f = Font.getFont(Font.FACE_SYSTEM, Font.STYLE_PLAIN, Font.SIZE_MEDIUM); boolean isPlay = true; int arrayLength = 33; int screenWidth = 0; int screenHeight = 0; int fontDis = 0; byte move = 4; String[] propertyStr = new String[arrayLength]; int[] strLength = new int[arrayLength]; int[][] Loca = new int[arrayLength][3]; MIDlet midlet; public SysInfoCanvas(MIDlet mid, Display dis) { super(true); midlet = mid; display = dis; setFullScreenMode(true); screenWidth = getWidth(); screenHeight = getHeight(); GetProperty(); fontDis = f.getHeight() + 2; for (int j = 0; j < arrayLength; j++) { Loca[j][2] = f.stringWidth(propertyStr[j]); Loca[j][1] = j * fontDis; Loca[j][0] = 0; } addCommand(new Command("大字体", Command.SCREEN, 1)); addCommand(new Command("中字体", Command.SCREEN, 1)); addCommand(new Command("小字体", Command.SCREEN, 1)); addCommand(new Command("退出", Command.EXIT, 1)); setCommandListener(this); } public void start() { isPlay = true; new Thread(this).start(); } public void stop() { isPlay = false; } public void run() { Graphics g = getGraphics(); while (isPlay) { input(); drawScreen(g); try { Thread.sleep(80); } catch (InterruptedException ie) { ie.printStackTrace(); } } } private void drawScreen(Graphics g) { g.setColor(0xffff00); g.fillRect(0, 0, screenWidth, screenHeight); drawSodino(g); g.setColor(0x000000); Property(g); flushGraphics(); } public void drawSodino(Graphics g) { g.setColor(0xf813); Font f = Font.getFont(Font.FACE_PROPORTIONAL, Font.STYLE_BOLD | Font.STYLE_ITALIC, Font.SIZE_LARGE); g.setFont(f); for (int i = 0; i < 6; i++) { g.drawString("Sodino", 30, i * 20, Graphics.LEFT | Graphics.TOP); } } public void input() { int key = getKeyStates(); int temp = 0; if (UP_PRESSED == key) { temp = Loca[0][1]; for (int j = 0; j < arrayLength - 1; j++) { Loca[j][1] = Loca[j + 1][1]; } Loca[arrayLength - 1][1] = temp; } else if (DOWN_PRESSED == key) { temp = Loca[arrayLength - 1][1]; for (int j = arrayLength - 1; j > 0; j--) { Loca[j][1] = Loca[j - 1][1]; } Loca[0][1] = temp; } else if (LEFT_PRESSED == key) { for (int i = 0; i < arrayLength; i++) { if (Loca[i][1] >= 0 && Loca[i][1] + f.getHeight() <= screenHeight && 0 > Loca[i][0]) { Loca[i][0] += move; } } } else if (RIGHT_PRESSED == key) { for (int i = 0; i < arrayLength; i++) { if (Loca[i][1] >= 0 && Loca[i][1] + f.getHeight() <= screenHeight && screenWidth < Loca[i][0] + Loca[i][2]) { Loca[i][0] -= move; } } } } public void Property(Graphics g) { g.setFont(f); propertyStr[arrayLength - 2] = "当前空余内存: " + Runtime.getRuntime().freeMemory(); System.gc(); propertyStr[arrayLength - 1] = "最大空闲内存:" + Runtime.getRuntime().freeMemory(); for (int i = 0; i < arrayLength; i++) { g.drawString(propertyStr[i], Loca[i][0], Loca[i][1], Graphics.LEFT | Graphics.TOP); } } public void commandAction(Command c, Displayable dis) { if (c.getLabel().equals("退出")) { midlet.notifyDestroyed(); } else if (c.getLabel().equals("大字体")) { f = Font.getFont(Font.FACE_SYSTEM, Font.STYLE_PLAIN, Font.SIZE_LARGE); ResetStringWidth(); modifyLoca1(); } else if (c.getLabel().equals("中字体")) { f = Font.getFont(Font.FACE_SYSTEM, Font.STYLE_PLAIN, Font.SIZE_MEDIUM); ResetStringWidth(); modifyLoca1(); } else if (c.getLabel().equals("小字体")) { f = Font.getFont(Font.FACE_SYSTEM, Font.STYLE_PLAIN, Font.SIZE_SMALL); ResetStringWidth(); modifyLoca1(); } } public void modifyLoca1() { int theTopLoca = 0; for (int i = 0; i < arrayLength; i++) { if (0 == Loca[i][1]) { theTopLoca = i; break; } } for (int i = theTopLoca + 1; i < theTopLoca + arrayLength; i++) { int temp = i % arrayLength; if (temp == 0) { Loca[0][1] = Loca[arrayLength - 1][1] + fontDis; } else { Loca[temp][1] = Loca[temp - 1][1] + fontDis; } } } public void ResetStringWidth() { propertyStr[arrayLength - 4] = "当前字体高度: " + f.getHeight(); fontDis = f.getHeight() + 2; for (int i = 0; i < arrayLength; i++) { Loca[i][2] = f.stringWidth(propertyStr[i]); } } public void GetProperty() { propertyStr[0] = "MIDP: " + System.getProperty("microedition.profiles"); propertyStr[1] = "CLDC: " + System.getProperty("microedition.configuration"); propertyStr[2] = "字符包: " + System.getProperty("microedition.encoding"); propertyStr[3] = "手机产国: " + System.getProperty("microedition.locale"); propertyStr[4] = "手机型号: " + System.getProperty("microedition.platform"); propertyStr[5] = "串口列表: " + System.getProperty("microedition.commports"); propertyStr[6] = "手机名: " + System.getProperty("microedition.hostname"); propertyStr[7] = "支持混音: " + System.getProperty("supports.mixing"); propertyStr[8] = "视频捕获: " + System.getProperty("supports.audio.capture"); propertyStr[9] = "声音捕获: " + System.getProperty("supports.vedio.capture"); propertyStr[10] = "视频格式: " + System.getProperty("audio.encoding"); propertyStr[11] = "声音格式: " + System.getProperty("vedio.encodings"); propertyStr[12] = "支持记录: " + System.getProperty("supports.recording"); propertyStr[13] = "支持3D: " + System.getProperty("microedition.m3g.version"); if (true == display.flashBacklight(2500)) { propertyStr[14] = "背景灯闪烁: true"; } else { propertyStr[14] = "背景灯闪烁: false"; } if (true == display.vibrate(500)) { propertyStr[15] = "支持震动: true"; } else { propertyStr[15] = "支持震动: false"; } if (true == display.isColor()) { propertyStr[16] = "是否彩色: true"; propertyStr[17] = "颜色数: " + display.numColors(); ; } else { propertyStr[16] = "是否彩色: false"; propertyStr[17] = "颜色数: White and Black Only"; } if (true == this.hasRepeatEvents()) { propertyStr[18] = "连续按键: true"; } else { propertyStr[18] = "连续按键: false"; } if (true == this.hasPointerEvents()) { propertyStr[19] = "指针事件: true"; } else { propertyStr[19] = "指针事件: false"; } if (true == this.hasPointerMotionEvents()) { propertyStr[20] = "指针拖拽: true"; } else { propertyStr[20] = "指针拖拽: false"; } if (true == this.isDoubleBuffered()) { propertyStr[21] = "支持双缓存: true"; } else { propertyStr[21] = "支持双缓存: false"; } propertyStr[22] = "蓝牙版本: " + System.getProperty("Bluetooth.api.version"); propertyStr[23] = "短信服务中心号码: " + System.getProperty("wireless.messaging.sms.smsc"); propertyStr[24] = "手机存储卡名称: " + System.getProperty("fileconn.dir.memorycard.name"); propertyStr[25] = "流媒体格式: " + System.getProperty("streamable.contents"); propertyStr[arrayLength - 7] = "IMEI号: " + getIMEI(); propertyStr[arrayLength - 6] = "Lac号: " + getLac(); propertyStr[arrayLength - 5] = "CellID号: " + getCellID(); propertyStr[arrayLength - 4] = "字体高度: " + f.getHeight(); propertyStr[arrayLength - 3] = "总内存:" + Runtime.getRuntime().totalMemory(); propertyStr[arrayLength - 2] = "当前空闲内存:" + Runtime.getRuntime().freeMemory(); propertyStr[arrayLength - 1] = "最大空闲内存:" + Runtime.getRuntime().totalMemory(); } private String getIMEI() { return (System.getProperty("com.sonyericsson.imei") == null ? System .getProperty("com.nokia.IMEI") == null ? System .getProperty("com.nokia.mid.imei") == null ? System .getProperty("phone.imei") == null ? System.getProperty("IMEI") == null ? System .getProperty("com.samsung.imei") == null ? System .getProperty("com.siemens.imei") == null ? "null" : System .getProperty("com.siemens.imei") : System .getProperty("com.samsung.imei") : System.getProperty("IMEI") : System.getProperty("phone.imei") : System.getProperty("com.nokia.mid.imei") : System.getProperty("com.nokia.IMEI") : System.getProperty("com.sonyericsson.imei")); } private String getLac() { return (System.getProperty("com.sonyericsson.net.lac") == null ? System .getProperty("com.nokia.mid.lac") == null ? System .getProperty("LocAreaCode") == null ? "null" : System .getProperty("LocAreaCode") : System .getProperty("com.nokia.mid.lac") : System .getProperty("com.sonyericsson.net.lac")); } private String getCellID() { return (System.getProperty("com.sonyericsson.net.cellid") == null ? System .getProperty("com.nokia.mid.cellid") == null ? System .getProperty("com.samsung.cellid") == null ? System .getProperty("com.siemens.cellid") == null ? "null" : System .getProperty("com.siemens.cellid") : System .getProperty("com.samsung.cellid") : System .getProperty("com.nokia.mid.cellid") : System.getProperty("com.sonyericsson.net.cellid")); } }

本人正在学习J2ME,将自己的所获发于网上与大家分享，不足之处待路过的神仙哥哥神仙姐姐们拍砖提醒之。感激流涕！！！！！！！！

附jad文件的错误代码：

jad ( Java Application Discriptor ) 文件是J2ME的一个重要的组成部分，在我们发布J2ME程序的时候，jad文件经常报出各种错误，如：
　　com.sun.kvem.midletsuite.InvalidJadException: Reason = 13
　　其中的错误原因是 1-52的代码，很让人费解。我在网上找到了这些代码的解释，和大家分享如下：

　　public static final int JAD_SERVER_NOT_FOUND = 1;
　　public static final int JAD_NOT_FOUND = 2;
　　public static final int MISSING_PROVIDER_CERT = 4;
　　public static final int CORRUPT_PROVIDER_CERT = 5;
　　public static final int UNKNOWN_CA = 6;
　　public static final int INVALID_PROVIDER_CERT = 7;
　   public static final int CORRUPT_SIGNATURE = 8;
　　public static final int INVALID_SIGNATURE = 9;
　　public static final int UNSUPPORTED_CERT = 10;
　　public static final int EXPIRED_PROVIDER_CERT = 11;
　　public static final int EXPIRED_CA_KEY = 12;
　　public static final int MISSING_SUITE_NAME = 13;
　　public static final int MISSING_VENDOR = 14;
　　public static final int MISSING_VERSION = 15;
　　public static final int INVALID_VERSION = 16;
　   public static final int OLD_VERSION = 17;
　　public static final int MISSING_JAR_URL = 18;
　　public static final int JAR_SERVER_NOT_FOUND = 19;
　　public static final int JAR_NOT_FOUND = 20;
　　public static final int MISSING_JAR_SIZE = 21;
　　public static final int SUITE_NAME_MISMATCH = 25;
　　public static final int VERSION_MISMATCH = 26;
　　public static final int VENDOR_MISMATCH = 27;
　　public static final int INVALID_KEY = 28;
　　public static final int INVALID_VALUE = 29;
　　public static final int INSUFFICIENT_STORAGE = 30;
　　public static final int JAR_SIZE_MISMATCH = 31;
　　public static final int NEW_VERSION = 32;
　　public static final int UNAUTHORIZED = 33;
　　public static final int JAD_MOVED = 34;
　　public static final int CANNOT_AUTH = 35;
　　public static final int CORRUPT_JAR = 36;
　　public static final int INVALID_JAD_TYPE = 37;
　   public static final int INVALID_JAR_TYPE = 38;
　　public static final int ALREADY_INSTALLED = 39;
　　public static final int DEVICE_INCOMPATIBLE = 40;
　　public static final int MISSING_CONFIGURATION = 41;
　　public static final int MISSING_PROFILE = 42;
　　public static final int INVALID_JAD_URL = 43;
　　public static final int INVALID_JAR_URL = 44;
　　public static final int PUSH_DUP_FAILURE = 45;
　　public static final int PUSH_FORMAT_FAILURE = 46;
　　public static final int PUSH_PROTO_FAILURE = 47;
　　public static final int PUSH_CLASS_FAILURE = 48;
　　public static final int AUTHORIZATION_FAILURE = 49;
　　public static final int ATTRIBUTE_MISMATCH = 50;
　　public static final int PROXY_AUTH = 51;
　   public static final int TRUSTED_OVERWRITE_FAILURE = 52;
　　有了这些代码的解释，我们就很容易知道错误的原因了。
　　另外，大家知道，有的手机在安装jar文件的时候，不需要jad文件。这是因为手机厂商在操作系统中内置了对jar文件的解析功能。就如同手机自动生成 jad文件，然后使用这个jad文件安装jar文件一样。