代碼如下：import java.io.IOException;
import javax.microedition.midlet.MIDlet;
import javax.microedition.lcdui.*;
import javax.microedition.midlet.MIDletStateChangeException;
public class Calculate extends MIDlet {
private Display display;//定義Display對象
private MyCanvas can;//定義一個MyCanvas實例
public Calculate() {
MyCanvas can=new MyCanvas();//初始化
}
protected void destroyApp(boolean arg0) throws MIDletStateChangeException {
notifyDestroyed();
}
protected void pauseApp() {
}
protected void startApp() throws MIDletStateChangeException {
display=Display.getDisplay(this);
MyCanvas can=new MyCanvas();
display.setCurrent(can);
}
public class MyCanvas extends Canvas{
private Image img[]=new Image[25];//定義一個圖片數組
int curX,curY,flag;//curX,curY分別是圖片的x,y座標，flag是一個標誌
float num,t;
String str="",str1="",str2="";
boolean nam=false;//按鈕被點擊時繪製圖片的標誌
MyCanvas(){
super();
try {
img[0]=Image.createImage("/0.png");
img[1]=Image.createImage("/1.png");
img[2]=Image.createImage("/2.png");
img[3]=Image.createImage("/3.png");
img[4]=Image.createImage("/4.png");
img[5]=Image.createImage("/5.png");
img[6]=Image.createImage("/6.png");
img[7]=Image.createImage("/7.png");
img[8]=Image.createImage("/8.png");
img[9]=Image.createImage("/9.png");
img[10]=Image.createImage("/10.png");
img[11]=Image.createImage("/11.png");
img[12]=Image.createImage("/-.png");
img[13]=Image.createImage("/+.png");
img[14]=Image.createImage("/c.png");
img[15]=Image.createImage("/12.png");
img[16]=Image.createImage("/x.png");
img[17]=Image.createImage("/20.png");
img[18]=Image.createImage("/21.png");
img[19]=Image.createImage("/24.png");
img[20]=Image.createImage("/23.png");
curX=10;curY=50;
} catch (IOException e) {
e.printStackTrace();
}
}
protected void paint(Graphics g) {
g.setColor(100,100,100);
g.fillRect(0, 0, getWidth(), getHeight());
g.setColor(0x00FFFFFF);
g.fillRoundRect(10,10,getWidth()-20,25,20,20);
g.drawImage(img[1],10 ,50, Graphics.LEFT | Graphics.TOP);
g.drawImage(img[2],50 ,50, Graphics.LEFT | Graphics.TOP);
g.drawImage(img[3],90 ,50, Graphics.LEFT | Graphics.TOP);
g.drawImage(img[17],170,50,Graphics.LEFT|Graphics.TOP);
g.drawImage(img[4],10 ,90, Graphics.LEFT | Graphics.TOP);
g.drawImage(img[5],50 ,90, Graphics.LEFT | Graphics.TOP);
g.drawImage(img[6],90 ,90, Graphics.LEFT | Graphics.TOP);
g.drawImage(img[7],10 ,130, Graphics.LEFT | Graphics.TOP);
g.drawImage(img[8],50 ,130, Graphics.LEFT | Graphics.TOP);
g.drawImage(img[9],90 ,130, Graphics.LEFT | Graphics.TOP);
g.drawImage(img[0],10 ,170, Graphics.LEFT | Graphics.TOP);
g.drawImage(img[15],50 ,170, Graphics.LEFT | Graphics.TOP);
g.drawImage(img[11],90 ,170, Graphics.LEFT | Graphics.TOP);
g.drawImage(img[13],130 ,50, Graphics.LEFT | Graphics.TOP);
g.drawImage(img[12],130 ,90, Graphics.LEFT | Graphics.TOP);
g.drawImage(img[16],130 ,130, Graphics.LEFT | Graphics.TOP);
g.drawImage(img[10],130,170, Graphics.LEFT | Graphics.TOP);
g.drawImage(img[18], 170, 90, Graphics.LEFT | Graphics.TOP);
g.drawImage(img[20], 170, 130, Graphics.LEFT | Graphics.TOP);
g.drawImage(img[19], 170, 170, Graphics.LEFT | Graphics.TOP);
if(nam){
g.setColor(250, 0, 0);
g.fillRect(curX,curY,33,33);
}
g.setColor(255, 0, 0);
g.drawRect(curX,curY,33,33);
g.setColor(0, 0, 0);
Font font=Font.getFont(Font.FACE_PROPORTIONAL,Font.STYLE_BOLD,Font.SIZE_LARGE);
g.setFont(font);
//防止字符溢出
if(str.length()<=27){
g.drawString(str, getWidth()-10, 10, Graphics.TOP|Graphics.RIGHT);
}
else{
int n;
n=str.length()-27;
str=str.substring(0, str.length()-n);
}
this.setFullScreenMode(true);//設置全屏
}
protected void keyPressed(int keyCode){
switch(keyCode){
case KEY_NUM0:
nam=true;
curX=10;curY=170;
str+="0";
repaint();
break;
case KEY_NUM1:
curX=10;curY=50;
nam=true;
str+=1;
repaint();
break;
case KEY_NUM2:
curX=50;curY=50;
nam=true;
str+="2";
repaint();
break;
case KEY_NUM3:
curX=90;curY=50;
nam=true;
str+="3";
repaint();
break;
case KEY_NUM4:
curX=10;curY=90;
nam=true;
str+="4";
repaint();
break;
case KEY_NUM5:
curX=50;curY=90;
nam=true;
str+="5";
repaint();
break;
case KEY_NUM6:
curX=90;curY=90;
nam=true;
str+="6";
repaint();
break;
case KEY_NUM7:
curX=10;curY=130;
nam=true;
str+="7";
repaint();
break;
case KEY_NUM8:
curX=50;curY=130;
nam=true;
str+="8";
repaint();
break;
case KEY_NUM9:
curX=90;curY=130;
nam=true;
str+="9";
repaint();
break;
}
switch(getGameAction(keyCode)){
case UP:
if(curY<=50)
{
}
else doUp();
break;
case LEFT:
if(curX<=20){
}
else doLeft();
break;
case RIGHT:
if(curX>=170){
}
else doRight();
break;
case DOWN:
if(curY>=170){
}
else doDown();
break;
}
if((curX==10&&curY==50)&&getGameAction(keyCode)==FIRE){
nam=true;
str+="1";
repaint();
}
if((curX==50&&curY==50)&&getGameAction(keyCode)==FIRE){
nam=true;
str+="2";
repaint();
}
if((curX==90&&curY==50)&&getGameAction(keyCode)==FIRE){
nam=true;
str+="3";
repaint();
}
if((curX==10&&curY==90)&&getGameAction(keyCode)==FIRE){
nam=true;
str+="4";
repaint();
}
if((curX==50&&curY==90)&&getGameAction(keyCode)==FIRE){
nam=true;
str+="5";
repaint();
}
if((curX==90&&curY==90)&&getGameAction(keyCode)==FIRE){
nam=true;
str+="6";
repaint();
}
if((curX==10&&curY==130)&&getGameAction(keyCode)==FIRE){
nam=true;
str+="7";
repaint();
}
if((curX==50&&curY==130)&&getGameAction(keyCode)==FIRE){
nam=true;
str+="8";
repaint();
}
if((curX==90&&curY==130)&&getGameAction(keyCode)==FIRE){
nam=true;
str+="9";
repaint();
}
if((curX==10&&curY==170)&&getGameAction(keyCode)==FIRE){
nam=true;
str+="0";
repaint();
}
if((curX==50&&curY==170)&&getGameAction(keyCode)==FIRE){
if(str==""){
nam=true;
repaint();
}
else{nam=true;
str+=".";
repaint();
}
}
if((curX==170&&curY==50)&&getGameAction(keyCode)==FIRE){
nam=true;
str="";
repaint();
}
if((curX==170&&curY==90)&&getGameAction(keyCode)==FIRE){
nam=true;
str=str.substring(0, str.length()-1);
repaint();
}
if((curX==170&&curY==130)&&getGameAction(keyCode)==FIRE){
nam=true;
String str1,str2;
str1=str;
num=Float.parseFloat(str1)*Float.parseFloat(str1);
str2=Float.toString(num);
str=str2;
repaint();
}
if((curX==170&&curY==170)&&getGameAction(keyCode)==FIRE){
try {
destroyApp(true);
} catch (MIDletStateChangeException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if((curX==130&&curY==50)&&getGameAction(keyCode)==FIRE){
str1=str;
str="";
nam=true;
repaint();
if(str==""){
if((curX==10&&curY==50)&&getGameAction(keyCode)==FIRE){
str+="1";
}
if((curX==50&&curY==50)&&getGameAction(keyCode)==FIRE){
str+="2";
}
if((curX==90&&curY==50)&&getGameAction(keyCode)==FIRE){
str+="3";
}
if((curX==10&&curY==90)&&getGameAction(keyCode)==FIRE){
str+="4";
}
if((curX==50&&curY==90)&&getGameAction(keyCode)==FIRE){
str+="5";
}
if((curX==90&&curY==90)&&getGameAction(keyCode)==FIRE){
str+="6";
}
if((curX==10&&curY==130)&&getGameAction(keyCode)==FIRE){
str+="7";
}
if((curX==50&&curY==130)&&getGameAction(keyCode)==FIRE){
str+="8";
}
if((curX==90&&curY==130)&&getGameAction(keyCode)==FIRE){
str+="9";
}
if((curX==10&&curY==170)&&getGameAction(keyCode)==FIRE){
str+="0";
}
if((curX==50&&curY==170)&&getGameAction(keyCode)==FIRE){
if(str==""){
}
else{
str+=".";
}
}
}
flag=1;
}
if((curX==130&&curY==90)&&getGameAction(keyCode)==FIRE){
str1=str;
str="";
nam=true;
repaint();
if(str==""){
if((curX==10&&curY==50)&&getGameAction(keyCode)==FIRE){
str+="1";
}
if((curX==50&&curY==50)&&getGameAction(keyCode)==FIRE){
str+="2";
}
if((curX==90&&curY==50)&&getGameAction(keyCode)==FIRE){
str+="3";
}
if((curX==10&&curY==90)&&getGameAction(keyCode)==FIRE){
str+="4";
}
if((curX==50&&curY==90)&&getGameAction(keyCode)==FIRE){
str+="5";
}
if((curX==90&&curY==90)&&getGameAction(keyCode)==FIRE){
str+="6";
}
if((curX==10&&curY==130)&&getGameAction(keyCode)==FIRE){
str+="7";
}
if((curX==50&&curY==130)&&getGameAction(keyCode)==FIRE){
str+="8";
}
if((curX==90&&curY==130)&&getGameAction(keyCode)==FIRE){
str+="9";
}
if((curX==10&&curY==170)&&getGameAction(keyCode)==FIRE){
str+="0";
}
if((curX==50&&curY==170)&&getGameAction(keyCode)==FIRE){
if(str==""){
}
else{
str+=".";
}
}
}
flag=2;
}
if((curX==130&&curY==130)&&getGameAction(keyCode)==FIRE){
str1=str;
str="";
nam=true;
repaint();
if(str==""){
if((curX==10&&curY==50)&&getGameAction(keyCode)==FIRE){
str+="1";
}
if((curX==50&&curY==50)&&getGameAction(keyCode)==FIRE){
str+="2";
}
if((curX==90&&curY==50)&&getGameAction(keyCode)==FIRE){
str+="3";
}
if((curX==10&&curY==90)&&getGameAction(keyCode)==FIRE){
str+="4";
}
if((curX==50&&curY==90)&&getGameAction(keyCode)==FIRE){
str+="5";
}
if((curX==90&&curY==90)&&getGameAction(keyCode)==FIRE){
str+="6";
}
if((curX==10&&curY==130)&&getGameAction(keyCode)==FIRE){
str+="7";
}
if((curX==50&&curY==130)&&getGameAction(keyCode)==FIRE){
str+="8";
}
if((curX==90&&curY==130)&&getGameAction(keyCode)==FIRE){
str+="9";
}
if((curX==10&&curY==170)&&getGameAction(keyCode)==FIRE){
str+="0";
}
if((curX==50&&curY==170)&&getGameAction(keyCode)==FIRE){
if(str==""){
}
else{
str+=".";
}
}
}
flag=3;
}
if((curX==130&&curY==170)&&getGameAction(keyCode)==FIRE){
str1=str;
str="";
nam=true;
repaint();
if(str==""){
if((curX==10&&curY==50)&&getGameAction(keyCode)==FIRE){
str+="1";
}
if((curX==50&&curY==50)&&getGameAction(keyCode)==FIRE){
str+="2";
}
if((curX==90&&curY==50)&&getGameAction(keyCode)==FIRE){
str+="3";
}
if((curX==10&&curY==90)&&getGameAction(keyCode)==FIRE){
str+="4";
}
if((curX==50&&curY==90)&&getGameAction(keyCode)==FIRE){
str+="5";
}
if((curX==90&&curY==90)&&getGameAction(keyCode)==FIRE){
str+="6";
}
if((curX==10&&curY==130)&&getGameAction(keyCode)==FIRE){
str+="7";
}
if((curX==50&&curY==130)&&getGameAction(keyCode)==FIRE){
str+="8";
}
if((curX==90&&curY==130)&&getGameAction(keyCode)==FIRE){
str+="9";
}
if((curX==10&&curY==170)&&getGameAction(keyCode)==FIRE){
str+="0";
}
if((curX==50&&curY==170)&&getGameAction(keyCode)==FIRE){
if(str==""){
}
else{
str+=".";
}
}
}
flag=4;
}
if((curX==90&&curY==170)&&getGameAction(keyCode)==FIRE){
if(flag==1){
num=Float.parseFloat(str1)+Float.parseFloat(str);
str2=Float.toString(num);
}
if(flag==2){
num=Float.parseFloat(str1)-Float.parseFloat(str);
str2=Float.toString(num);
}
if(flag==3){
num=Float.parseFloat(str1)*Float.parseFloat(str);
str2=Float.toString(num);
}
if(flag==4){
num=Float.parseFloat(str1)/Float.parseFloat(str);
str2=Float.toString(num);
}
flag=0;
nam=true;
str=str2;
repaint();
}
}
private void doDown() {
curY+=40;
this.repaint();
this.serviceRepaints();
}
private void doRight() {
curX+=40;
this.repaint();
this.serviceRepaints();
}
private void doLeft() {
curX-=40;
this.repaint();
this.serviceRepaints();
}
private void doUp() {
curY-=40;
this.repaint();
this.serviceRepaints();
}
protected void keyRepeated(int keyCode){
keyPressed(keyCode);
}
protected void keyReleased(int keyCode){
nam=false;
repaint();
}
}
}