UC知道J2ME Canvas
来源：百度知道 编辑：UC知道 时间：2024/06/10 21:14:45
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;
import javax.microedition.lcdui.*;
public class Assignment extends MIDlet {
private Display display;
MyCanvas mc=new MyCanvas();
private int myCode;
private int m_KeyCode1;
public Assignment() {
}
protected void startApp() throws MIDletStateChangeException {
display=Display.getDisplay(this);
mc.setTitle("绘图");
display.setCurrent(mc);
}
protected void destroyApp(boolean arg0) throws MIDletStateChangeException {
}
protected void pauseApp() {
}
class MyCanvas extends Canvas{
public void paint(Graphics g){
g.setColor(255, 255, 255);
g.fillRect(0, 0, this.getHeight(), this.getWidth());
switch(myCode){
case 49: System.out.println("11111"); repaint(); //g.drawArc(60-10, 60-1
import javax.microedition.midlet.MIDletStateChangeException;
import javax.microedition.lcdui.*;
public class Assignment extends MIDlet {
private Display display;
MyCanvas mc=new MyCanvas();
private int myCode;
private int m_KeyCode1;
public Assignment() {
}
protected void startApp() throws MIDletStateChangeException {
display=Display.getDisplay(this);
mc.setTitle("绘图");
display.setCurrent(mc);
}
protected void destroyApp(boolean arg0) throws MIDletStateChangeException {
}
protected void pauseApp() {
}
class MyCanvas extends Canvas{
public void paint(Graphics g){
g.setColor(255, 255, 255);
g.fillRect(0, 0, this.getHeight(), this.getWidth());
switch(myCode){
case 49: System.out.println("11111"); repaint(); //g.drawArc(60-10, 60-1
因为你在paint里面调用repaint()方法；
repaint的操作实际上就是重新执行paint一次 如此往复 等于你这就是个死循环
你把switch(myCode){
case 49: System.out.println("11111"); repaint();
}
挪到
public void keyPressed(int keyCode) {
myCode=keyCode;
}
里就不会按一下打印N个11111了