package CANVAS3;

import java.util.Random;

import javax.microedition.lcdui.Canvas;
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.Graphics;
import javax.microedition.lcdui.Ticker;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;

/**
 * 產生一個0~9之間的隨機顏色的隨機數，點擊數字鍵相匹配，按錯扣2分，超時按1分
 * 初始為5分
 * @author Jakey
 *
 */
public class Midlet2 extends MIDlet {
	class GuessGame extends Canvas implements Runnable, CommandListener {
		private String num = "-1";// 產生的隨機數
		String action = "";
		private int x = 0;
		private int y = 0;
		private int dots = 5;// 初始分數
		private Thread th;
		private boolean RUN = true;
		private Random r = new Random();
		private Command cmdReStart = new Command("重新開始", Command.SCREEN, 1);

		public GuessGame() {
			th = new Thread(this);
			th.start();
		}

		public void commandAction(Command c, Displayable d) {
			if (c == cmdReStart) {
				RUN = true;
				num = "-1";
				dots = 5;
				action = "";
				this.removeCommand(cmdReStart);
				th = new Thread(this);
				th.start();
			}
		}

		public void paint(Graphics g) {
			this.setTitle("當前分數："+(dots <= 0?0:dots));
			g.setColor(255, 255, 255);
			g.fillRect(0, 0, this.getWidth(), this.getHeight());
			Font f = Font.getFont(Font.FACE_SYSTEM, Font.STYLE_BOLD,
					Font.SIZE_LARGE);
			g.setFont(f);
			g.setColor(r.nextInt(256), r.nextInt(256), r.nextInt(256));
			x = r.nextInt(this.getWidth());
			y = r.nextInt(this.getHeight());
			g.drawString(num.equals("-1") ? "" : num, x, y, Graphics.TOP
					| Graphics.LEFT);
			if (dots <= 0) {
				//重新初始化
				g.setColor(255, 255, 255);
				g.fillRect(0, 0, this.getWidth(), this.getHeight());
				g.setColor(255, 0, 0);
				g.drawString("您輸了", this.getWidth() / 2, this.getHeight() / 2,
						Graphics.TOP | Graphics.HCENTER);
				RUN = false;
				th = null;
				this.addCommand(cmdReStart);
				this.setCommandListener(this);
			}
		}

		public void keyPressed(int keyCode) {
			if (dots > 0) {
				action = this.getKeyName(keyCode);
				if (num.equals(action)) {
					dots += 1;
				} else {
					dots -= 2;
				}
			}

		}

		public void run() {
			while (RUN) {
				num = String.valueOf(r.nextInt(10));
				repaint();
				try {
					Thread.currentThread().sleep(1000);
				} catch (Exception e) {
				}

				if (action.equals("")) {// 控制如果超時則扣一分
					dots--;
				}
			}
		}

	}

	private Display dis;
	private GuessGame gg = new GuessGame();

	protected void startApp() throws MIDletStateChangeException {
		dis = Display.getDisplay(this);
		dis.setCurrent(gg);
	}

	protected void destroyApp(boolean arg0) throws MIDletStateChangeException {
		// TODO Auto-generated method stub

	}

	protected void pauseApp() {
		// TODO Auto-generated method stub

	}
}

File dir = Environment.getExternalStorageDirectory();
File yourFile = new File(dir, "path/to/the/file/inside/the/sdcard.ext");

避免使用
String path = Environment.getExternalStorageDirectory().getAbsolutePath();
FileInputStream iStream = new FileInputStream(path);
有些时候这种方法不好用

创建菜单:
	public boolean onCreateOptionsMenu(Menu menu) {
		menu.add(Menu.NONE, OPTION, Menu.NONE, R.string.menuoption);
		menu.add(Menu.NONE, OPTION, Menu.NONE, R.string.cancel);
		return super.onCreateOptionsMenu(menu);
	}

	public boolean onOptionsItemSelected(MenuItem item) {
		if(item.getItemId()==OPTION){
			
		}
		
		return true;
	}