main.java

j2me手机应用开发的例子程序

package test;


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

public class Main  extends MIDlet {

	Canvas myCanvas;

	public Main() {
		myCanvas = new TestMCAPI(this);
	}

	public void startApp() {
		Display display = Display.getDisplay(this);

		// remember, Canvas is a Displayable so it can
		// be set on the display like Screen elements
		display.setCurrent(myCanvas);

		// force repaint of the canvas
		myCanvas.repaint();
	}

	public void pauseApp() {
	}

	public void destroyApp(boolean unconditional) {
	}
}

class MyCanvas extends Canvas {
	public void paint(Graphics g) {
		// create a 20x20 black square in the center

		// clear the screen first
		g.setColor(0xffffff);
		g.fillRect(0, 0, getWidth(), getHeight());


		g.setColor(0x000000); // Clip is black
		g.drawRect(g.getClipX()+1, g.getClipX()+1, g.getClipWidth()-3, g.getClipHeight()-3);
		
		// draw the square, changed to rely on instance variables
		g.setColor(0x0000ff); // cube is blue
		g.fillRect(x, y, 40, 40);
	}

	public void keyPressed(int keyCode) {

		// what game action does this key map to?
		int gameAction = getGameAction(keyCode);

		if(gameAction == RIGHT) {
			x += dx;
		} else if(gameAction == LEFT) {
			x -= dx;
		} else if(gameAction == UP) {
			y -= dy;
		} else if(gameAction == DOWN) {
			y += dy;
		} else if(gameAction == FIRE) {
			//getMidlet().notifyDestroyed();
		}

		// make sure to repaint
		repaint(0,0,130,130);
	}

	// starting coordinates
	private int x = getWidth()/2 - 10;
	private int y = getHeight()/2 - 10;

	// distance to move
	private int dx = 2;
	private int dy = 2;
}