疯了！让这个Sprite实例运行起来！
Sprite没用过、那些API也看不懂、所以在网上找了一个实例、编译没有报错、但事实上是运行不起来的。
烦请高手帮我修改修改，做成ME程序 <即包含MIDlet的程序> 要确保复制上去不用修改就可以直接运行。
先鞠个弓。
完整程序如下：
import javax.microedition.lcdui.*;
import javax.microedition.lcdui.game.*;
public class TankGameCanvas extends GameCanvas implements Runnable {
// 控制方向：
private static int INDEX_OF_UP = 0;
private static int INDEX_OF_DOWN = 1;
private static int INDEX_OF_LEFT = 3;
private static int INDEX_OF_RIGHT = 2;
private boolean isPlay; // Game Loop runs when isPlay is true
private long delay; // To give thread consistency
private int currentX, currentY; // To hold current position of the 'X '
private int width; // To hold screen width
private int height; // To hold screen height
private Sprite spriteTank; // our sprite!
// Constructor and initialization
public TankGameCanvas() {
super(true);
width = getWidth();
height = getHeight();
currentX = width / 2;
currentY = height / 2;
delay = 20;
// init sprite:
try {
Image image = Image.createImage( "/res/img/player1.png "); // 注意路径
spriteTank = new Sprite(image, 16, 16); // 大小是16x16
} catch (Exception e) {
e.printStackTrace();
}
}
// Automatically start thread for game loop
public void start() {
isPlay = true;
new Thread(this).start();
}
public void stop() {
isPlay = false;
}
// Main Game Loop
public void run() {
Graphics g = getGraphics();
while (isPlay) {
input();
drawScreen(g);
try {
Thread.sleep(delay);
} catch (InterruptedException ie) {
}
}
}
// Method to Handle User Inputs
private void input() {
int keyStates = getKeyStates();
// Left
if ((keyStates & LEFT_PRESSED) != 0) {
currentX = Math.max(0, currentX - 1);
spriteTank.setFrame(INDEX_OF_LEFT);
}
// Right
if ((keyStates & RIGHT_PRESSED) !=0 ) {
if ( currentX + 5 < width)
currentX = Math.min(width, currentX + 1);
spriteTank.setFrame(INDEX_OF_RIGHT);
}
// Up
if ((keyStates & UP_PRESSED) != 0) {
currentY = Math.max(0, currentY - 1);
spriteTank.setFrame(INDEX_OF_UP);
}
// Down
if ((keyStates & DOWN_PRESSED) !=0) {
if ( currentY + 10 < height)
currentY = Math.min(height, currentY + 1);
spriteTank.setFrame(INDEX_OF_DOWN);
}
}
// Method to Display Graphics
private void drawScreen(Graphics g) {
g.setColor(0); // black
g.fillRect(0, 0, getWidth(), getHeight());
// 画一个Sprite非常简单：
spriteTank.setPosition(currentX, currentY);
spriteTank.paint(g);
flushGraphics();
}
}
这个程序不含MIDlet所以根本运行不起来，我加上MIDlet后还是没有运行，但是情况有所不同、说明我没修改对，请高手帮帮忙。拜托、鞠躬。
[解决办法]
很简单啊。
//MainMidlet.java
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
public class MainMidlet extends MIDlet {
private static MainMidlet instance;
private Display display;
private TankGameCanvas tgc;
public MainMidlet() {
instance = this;
tgc = new TankGameCanvas();
tgc.start();
}
public void startApp() {
display = Display.getDisplay(this);
display.setCurrent(tgc);
}
public void pauseApp() {
}
public void destroyApp(boolean unconditional) {
}
public static void quitApp() {
instance.destroyApp(true);
instance.notifyDestroyed();
instance = null;
}
}
//------------------------
//TankGameCanvas.java
import javax.microedition.lcdui.*;
import javax.microedition.lcdui.game.*;
public class TankGameCanvas extends GameCanvas implements Runnable {
// 控制方向：
private static int INDEX_OF_UP = 0;
private static int INDEX_OF_DOWN = 1;
private static int INDEX_OF_LEFT = 3;
private static int INDEX_OF_RIGHT = 2;
private boolean isPlay; // Game Loop runs when isPlay is true
private long delay; // To give thread consistency
private int currentX, currentY; // To hold current position of the 'X '
private int width; // To hold screen width
private int height; // To hold screen height
private Sprite spriteTank; // our sprite!
// Constructor and initialization
public TankGameCanvas() {
super(true);
width = getWidth();
height = getHeight();
currentX = width / 2;
currentY = height / 2;
delay = 20;
// init sprite:
try {
Image image = Image.createImage( "/player1.png "); // 注意路径
spriteTank = new Sprite(image, 16, 16); // 大小是16x16
} catch (Exception e) {
e.printStackTrace();
}
}
// Automatically start thread for game loop
public void start() {
isPlay = true;
new Thread(this).start();
}
public void stop() {
isPlay = false;
}
// Main Game Loop
public void run() {
Graphics g = getGraphics();
while (isPlay) {
input();
drawScreen(g);
try {
Thread.sleep(delay);
} catch (InterruptedException ie) {
}
}
}
// Method to Handle User Inputs
private void input() {
int keyStates = getKeyStates();
// Left
if ((keyStates & LEFT_PRESSED) != 0) {
currentX = Math.max(0, currentX - 1);
spriteTank.setFrame(INDEX_OF_LEFT);
}
// Right
if ((keyStates & RIGHT_PRESSED) !=0 ) {
if ( currentX + 5 < width)
currentX = Math.min(width, currentX + 1);
spriteTank.setFrame(INDEX_OF_RIGHT);
}
// Up
if ((keyStates & UP_PRESSED) != 0) {
currentY = Math.max(0, currentY - 1);
spriteTank.setFrame(INDEX_OF_UP);
}
// Down
if ((keyStates & DOWN_PRESSED) !=0) {
if ( currentY + 10 < height)
currentY = Math.min(height, currentY + 1);
spriteTank.setFrame(INDEX_OF_DOWN);
}
}
// Method to Display Graphics
private void drawScreen(Graphics g) {
g.setColor(0); // black
g.fillRect(0, 0, getWidth(), getHeight());
// 画一个Sprite非常简单：
spriteTank.setPosition(currentX, currentY);
spriteTank.paint(g);
flushGraphics();
}
}
[解决办法]
package hello;
import java.io.IOException;
import java.io.InputStream;
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.microedition.midlet.MIDlet;
import java.util.Random;
import javax.microedition.lcdui.game.*;
/**
*
* @author wjs5-8
* @version
*/
public class Midlet extends MIDlet implements CommandListener
{
private Display display;
private deycanvas maincanvas;
private Command exitCommand=new Command( "退出 ",Command.EXIT,1);
public void startApp() {
if(display==null)
{display=Display.getDisplay(this);
maincanvas=new deycanvas();
maincanvas.addCommand(exitCommand);
maincanvas.setCommandListener(this);
new Thread(maincanvas).start();
display.setCurrent(maincanvas);
}
}
public void pauseApp() {
}
public void destroyApp(boolean unconditional) {
}
public void commandAction(Command cmd,Displayable displayable){
if(cmd==exitCommand)
{
destroyApp(false);
notifyDestroyed();
}
}
}
class deycanvas extends GameCanvas implements Runnable{
public int action;
public boolean leftPressed,righrPressed,stop,upPressed,downPressed;
private int width;//屏幕宽度
private int height;//屏幕高
private int x,y,vx,vy;
public static final int BLUE = 0x000000ff;
public Graphics g;
private Sprite spriteTank;
private Sprite diren;
private Sprite spr;
private Sprite spl;
private Sprite spu;
private Sprite spd;
private boolean zhuangtai=false;
deycanvas()
{ super(true);
g=getGraphics();
stop=true;
width = getWidth();
height = getHeight();
x=width/2;
y=height/2;
vx=x;
vy=y;
try{
Image image = Image.createImage( "/img/5.png ");
Image imagediren=Image.createImage( "/img/4.png ");
spr=new Sprite(image,24,32);
spl=new Sprite(image,24,32);
spu=new Sprite(image,24,32);
spd=new Sprite(image,24,32);
spriteTank=new Sprite(image,24,32);
diren=new Sprite(imagediren,24,32);
spl.setFrameSequence(new int[]{9,10,11});
spr.setFrameSequence(new int[]{3,4,5});
spu.setFrameSequence(new int[]{0,1,2});
spd.setFrameSequence(new int[]{6,7,8});
}
catch(IOException e)
{ e.printStackTrace();
}
}
private void input()
{
int keyStates=getKeyStates();
if((keyStates & LEFT_PRESSED)!=0)
{spriteTank=spl;
leftPressed=true;
System.out.println( "leftleftleftlelt ");
}
if((keyStates & RIGHT_PRESSED)!=0)
{
spriteTank=spr;
righrPressed=true;
}
if((keyStates & UP_PRESSED)!=0)
{ spriteTank=spu;
upPressed=true;
}
if((keyStates & DOWN_PRESSED)!=0)
{ spriteTank=spd;
downPressed=true;
}
}
public synchronized void keyPressed(int keyCode)
{
int action=getGameAction(keyCode);
switch(action)
{
case LEFT:
leftPressed=true;
break;
case RIGHT:
righrPressed=true;
break;
case UP :
upPressed=true;
break;
case DOWN :
downPressed=true;
break;
default:
break;
}
//repaint();
}
public void run()
{ int i=3;
while(stop)
{
input();
if(leftPressed)
{
left();
leftPressed=false;
}
if(righrPressed)
{
right();
righrPressed=false;
}
if(upPressed)
{
up();
upPressed=false;
}
if(downPressed)
{
down();
downPressed=false;
}
diren.setPosition(100,57);
spriteTank.setPosition(vx,vy);
if(spriteTank.collidesWith(diren ,true))
{
zhuangtai=true;
vx=vx-2;
spriteTank.prevFrame();
}else{
zhuangtai=false;
}
rrrr(g, spriteTank);
try{
Thread.sleep(50);
}catch(InterruptedException e)
{
}
}
}
public void left()
{
if(vx> 5)
{
vx=vx-2;
spriteTank.nextFrame();
}
}
public void right()
{
if(vx <width-5)
{
vx=vx+2;
spriteTank.nextFrame();
}
}
public void up(){
if(vy> 5)
{
vy=vy-2;
spriteTank.nextFrame();
}
//spriteTank.setFrame(0);
}
public void down()
{
if(vy <height-5)
{
vy=vy+2;
spriteTank.nextFrame();
}
//spriteTank.setFrame(1);
}
public void rrrr(Graphics g,Sprite spriteTank ){
g.setColor(BLUE);
g.fillRect(0, 0, width, height);
if(zhuangtai)
{
g.setColor(0xffffff);
}else
{
g.setColor(0x0000ffff);
}
g.fillRect(0, 0, width, height);
// g.drawString( "O "+width+ "在线 "+ height,vx,vy,Graphics.LEFT|Graphics.TOP);
diren.paint(g);
spriteTank.paint(g);
flushGraphics();
}
