游戏结构
MIDlet
public class GameMidlet
extends MIDlet
{
private PlayCanvas play;
public static GameMidletinstance;
public GameMidlet()
{
instance = this;
play=new PlayCanvas(this);
}
protected void pauseApp()
{
}
protected void startApp()
{
Displayable cc=Display.getDisplay(this).getCurrent();
if(cc==null)
Display.getDisplay(this).setCurrent(play);
else
Display.getDisplay(this).setCurrent(cc);
}
protected void destroyApp(boolean parm1)
{
if(play!=null)
play.Release();
play=null;
}
public static void quitApp() {
instance.destroyApp(true);
instance.notifyDestroyed();
//System.gc();
}
}
canvas:
public class PlayCanvas extends Canvas implements Runnable{
GameMidletparent;
private boolean running;
private Image imgBody;
private Graphics gBody;
private int TIME=100;
private Thread thread=null;
private width ,height;
public PlayCanvas(GameMidlet parent) {
this.parent = parent;
width = getWidth();
height =getHeight();
imgBody = Image.createImage(width, height); // 缓冲界面
gBody = this.imgBody.getGraphics();
}
/*
线程启动
*/
public void start(){
if(!running){
thread = null;
System.gc();
running=true;
thread=new Thread(this);
thread.start();
}
}
/*
线程停止
*/
public void stop(){
if(running){
running = false;
}
}
/*
按键处理
*/
public void keyPressed(int keyCode) {
switch (keyCode) {
case KEY_UP_ARROW:
. .......................
break;
case KEY_DOWN_ARROW:
..............
break;
.......................
}
public void paint(Graphics g){
if (imgBody != null) {
g.drawImage(imgBody, 0, 0, Graphics.LEFT | Graphics.TOP); //游戏中的 精灵背景都画在imgBody上。
}
}
public void run(){
while(running){
long start = System.currentTimeMillis();
....... //运行一些逻辑和游戏界面的处理
int time = (int)(System.currentTimeMillis() - start);
if (time < TIME){
try {
Thread.sleep(TIME- time);
}catch (InterruptedException ex) {}
}else{
}
｝
}
public void Release(){// 退出游戏 释放对象
thread = null;
imgBody = null;
System.gc();
}
}