查看手机对Java的支持情况

为了查看各种各样的手机对Java的支持情况，特地编写了本程序。
程序是用J2ME开发的，很简单，只有两个类，编译打包成.jar文件后即可在手机上运行。

入口类

package org;

import javax.microedition.lcdui.Display;
import javax.microedition.midlet.MIDlet;

public class ViewMidlet extends MIDlet{

 private J2MEInfo info;
 
 public ViewMidlet(){
  info=new J2MEInfo(this);
 }
 public Display getDisplay(){
  return Display.getDisplay(this);
 }
 
 public void startApp() {
  getDisplay().setCurrent(info);
 }

 public void pauseApp() {
 }

 public void destroyApp(boolean unconditional) {

 }

}

 

 

处理类

package org;

import javax.bluetooth.LocalDevice;
import javax.microedition.lcdui.Alert;
import javax.microedition.lcdui.AlertType;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.StringItem;

public class J2MEInfo extends Form implements CommandListener {
 private ViewMidlet main;
 private Command about;
 private Command exit;

 public J2MEInfo(ViewMidlet main) {
  super("手机J2ME属性");
  this.main=main;
  init();
 }

 /**
  * 初始化参数
  */
 private void init() {
  about = new Command("关于", Command.OK, 1);
  exit = new Command("退出", Command.EXIT, 1);
  this.addCommand(about);
  this.addCommand(exit);
  this.setCommandListener(this);
  display();
 }

 /**
  * 显示J2ME属性
  */
 private void display() {
  String[] keys = {"平台：", "编码：", "MIDP：", "CLDC：", "PIM：", "文件系统："};
  String[] values = {"microedition.platform", "microedition.encoding", "microedition.profiles",
    "microedition.configuration", "microedition.pim.version", "microedition.io.file.FileConnection.version"};
  for (int i = 0; i < keys.length; i++) {
   StringItem item = new StringItem(keys[i], getInfo(1, values[i]));
   this.append(item);
  }
  StringItem item2 = new StringItem("蓝牙：", getInfo(2, "bluetooth.api.version"));
  this.append(item2);
 }
 
 /**
  * 获取J2ME属性
  * @param type   1代表从System类获取属性,2代表从LocalDevice类获取属性
  * @param property  属性名
  * @return    支持的版本号
  */
 private String getInfo(int type, String property){
  String value = null;
  if(type == 1){
   value = System.getProperty(property);
  }else{
   value = LocalDevice.getProperty(property);
  }
  if(value == null || value.trim().equals(""))
   return "不支持";
  else
   return value;
 }

 public void commandAction(Command c, Displayable d) {
  if (c == about) {
   main.getDisplay().setCurrent(new Alert("关于/n",
     "手机J2ME属性/n版本：1.0.2",null,AlertType.INFO), this);
  } else if (c == exit) {
   main.notifyDestroyed();
   main.destroyApp(true);
  }
 }
}