在J2ME程序中制作Splash画面效果.zip

import javax.microedition.midlet.*; import javax.microedition.lcdui.*; import java.util.*; import java.io.*; public class SplashTest extends MIDlet{ Display display; MyCanvas myCanvas; SplashCanvas splash; public SplashTest(){ display = Display.getDisplay(this); myCanvas = new MyCanvas(); splash = new SplashCanvas(display, myCanvas); } public void startApp(){ display.setCurrent(splash); } public void pauseApp(){ } public void destroyApp(boolean unconditional){ } class MyCanvas extends Canvas implements CommandListener{ static final int MY_SPRITE = 49; static final int WALL = 50; static final int ENEMY = 51; Command exitCmd; Image offScreen; Image mySpriteImage; Image enemyImage; Image wallImage; int x, y; int startX, startY; int totalWidth = 120*3, totalHeight = 120; int cellWidth = 24, cellHeight = 24; int XCellNum = 15; int YCellNum = 5; byte[][] mapData = new byte[YCellNum][XCellNum]; public MyCanvas(){ if(!isDoubleBuffered()){ offScreen = Image.createImage(getWidth(), getHeight()); } try{ mySpriteImage = Image.createImage("/mySprite.png"); enemyImage = Image.createImage("/enemy.png"); wallImage = Image.createImage("/wall.png"); } catch(Exception ex){} getMapData(); exitCmd = new Command("退出", Command.EXIT, 1); addCommand(exitCmd); setCommandListener(this); } public void paint(Graphics g){ Graphics old = g; if(offScreen != null){ g = offScreen.getGraphics(); } g.setColor(0xFFFFFF); g.fillRect(0, 0, getWidth(), getHeight()); g.translate(startX, startY); for(int i=0; i < YCellNum; i++){ for(int j=0; j < XCellNum; j++){ byte data = mapData[i][j]; switch(data){ case WALL: g.drawImage(wallImage, j*cellWidth, i*cellHeight, Graphics.LEFT|Graphics.TOP); break; case MY_SPRITE: g.drawImage(mySpriteImage, x+j*cellWidth, y+i*cellHeight, Graphics.LEFT|Graphics.TOP); break; case ENEMY: g.drawImage(enemyImage, j*cellWidth, i*cellHeight, Graphics.LEFT|Graphics.TOP); break; } } } g.translate(-startX, -startY); if(g != old){ old.drawImage(offScreen, 0, 0, Graphics.LEFT|Graphics.TOP); } } public void keyPressed(int keyCode){ int gameAction = getGameAction(keyCode); switch(gameAction){ case Canvas.UP: if(!isWall(x/24, (y-24)/24)){ y-=24; if(y<=0) y = 0; startY+=24; if(startY>=0) startY = 0; } repaint(); break; case Canvas.DOWN: if(!isWall(x/24, (y+24)/24)){ y+=24; if(y>=totalHeight) y = totalHeight; startY-=24; if(startY<=getHeight()-totalHeight) startY = getHeight()-totalHeight; } repaint(); break; case Canvas.LEFT: if(!isWall((x-24)/24, y/24)){ x-=24; if(x<=0) x = 0; startX+=24; if(startX>=0) startX = 0; } repaint(); break; case Canvas.RIGHT: if(!isWall((x+24)/24, y/24)){ x+=24; startX-=24; if(x>=totalWidth) x = totalWidth; if(startX<=getWidth()-totalWidth) startX = getWidth()-totalWidth; } repaint(); break; } } public void keyReleased(int keyCode){ } public void keyRepeated(int keyCode){ } public void commandAction(Command c, Displayable d){ if(c == exitCmd){ destroyApp(true); notifyDestroyed(); } } private void getMapData() { InputStream is = null; try { is = getClass().getResourceAsStream("/map.dat"); } catch(Exception ex){} int symbol; int x = 0, y = 0; try { while((symbol = is.read()) != -1){ switch(symbol){ case '\n': y++; x = 0; break; case '1': mapData[y][x] = MY_SPRITE; x++; break; case '2': mapData[y][x] = WALL; x++; break; case '3': mapData[y][x] = ENEMY; x++; break; default: x++; break; } } is.close(); } catch(Exception ex){} } boolean isWall(int x, int y){ if(x >= XCellNum || y >=YCellNum) return true; if(x < 0 || y < 0) return true; if(mapData[y][x] == WALL) return true; else return false; } } class SplashCanvas extends Canvas{ Display display; Displayable nextScreen; int holdTime; Timer splashTimer; Image image; public SplashCanvas(Display display, Displayable nextScreen){ this.display = display; this.nextScreen = nextScreen; try{ image = Image.createImage("/splash.png"); } catch(Exception ex){} splashTimer = new Timer(); display.setCurrent(this); holdTime = 6000; } public void paint(Graphics g){ g.setColor(0xFFFFFF); g.fillRect(0, 0, getWidth(), getHeight()); g.drawImage(image, 0, 0, Graphics.LEFT|Graphics.TOP); g.setColor(0); g.drawString("我的第一个游戏", getWidth()/2, getHeight()/2, Graphics.HCENTER|Graphics.TOP); g.drawString("版本："+getAppProperty("MIDlet-Version"), getWidth()/2, getHeight()-20, Graphics.HCENTER|Graphics.TOP); } public void showNotify(){ splashTimer.schedule(new SplashTask(this), holdTime); } public void setHoldTime(int holdTime){ this.holdTime = holdTime; } public void nextScreen(){ display.setCurrent(nextScreen); } } class SplashTask extends TimerTask{ SplashCanvas scanvas; public SplashTask(SplashCanvas scanvas){ this.scanvas = scanvas; } public void run(){ scanvas.nextScreen(); } } }