collisions.java

J2ME学习的好例子

/*--------------------------------------------------
 * Collisions.java
 * 使用精灵的演示MIDlet
 * 包括碰撞检验.
 *-------------------------------------------------*/
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

public class Collisions extends MIDlet implements CommandListener {
    protected Display display; // Reference to display

    private CollisionCanvas canvas; // 游戏画布

    private Command cmExit; // 退出按钮

    public Collisions() {
        display = Display.getDisplay(this);
        // 创建游戏画布和退出按钮
        if ((canvas = new CollisionCanvas(this)) != null) {
            cmExit = new Command("Exit", Command.EXIT, 1);
            canvas.addCommand(cmExit);
            canvas.setCommandListener(this);
        }
    }

    public void startApp() {
        if (canvas != null) {
            display.setCurrent(canvas);
            canvas.start();
        }
    }

    public void pauseApp() {
    }

    public void destroyApp(boolean unconditional) {
        canvas.stop();
    }

    public void commandAction(Command c, Displayable s) {
        if (c == cmExit) {
            destroyApp(true);
            notifyDestroyed();
        }
    }
}