我制作了一个画布J2ME程序，我使用按键和键码来完成程序！现在我有两个屏幕命令的大问题！ 我需要使用命令标签＆＃34; Ersal＆＃34;和＆＃34; Virayesh＆＃34;如下面的代码，但命令代码不起作用！我可以使用密钥代码（-6），但我不会在屏幕上显示命令标签。 那么你的解决方案是什么？ 我可以在屏幕上添加两个标签而不是命令吗？！ 或者我怎么能激活这些命令呢！
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;
import javax.microedition.lcdui.*;
import com.sun.midp.io.j2me.comm.WAP;
import com.sun.midp.io.j2me.comm.SDA;
public class Demo extends MIDlet
{
Command ersal = new Command("Ersal", Command.STOP, 1);
Command virayesh = new Command("Virayesh", Command.SCREEN, 1);
private Canvas m_canvas = new DemoCanvas();
private Display m_disp;
int v = 0;
public static final int IME_NOTIFY = -6;
public static final int KEY_ASTERISK = 42;
public static final int KEY_HASH = 35;
String a;
int step = -1;
public Demo() {
// TODO Auto-generated constructor stub
m_disp = Display.getDisplay(this);
m_disp.setCurrent(m_canvas);
}
private class DemoCanvas extends Canvas implements CommandListener
{
private String info = "Barname Estelam\n*:Meno Aval\n\nYek dokme ` `ra\nfeshar dahid";
public DemoCanvas(){}
public void paint(Graphics g)
{
g.setColor(0xFFFFFF);
g.fillRect(0, 0, this.getWidth(), this.getHeight());
g.setColor(0);
g.drawString(info, 0, 5, Graphics.LEFT|Graphics.TOP);
/*
if(step==-1){
step=0;
try {
Thread.sleep(5000);
} catch (InterruptedException ex) {
ex.printStackTrace();
}
info = "1:moshakhasat\nkhodro \n2:estelam taghib \n3:etelaat malek \n4:estelam khalafi";
repaint();
}
*
*/
}
protected void keyPressed(int keyCode)
{
/*
if(IME_NOTIFY == keyCode){
String m = WAP.GetT9String();
SDA.SDS_SendMsg("20002",m);
info = WAP.GetT9String() + "\nersal shod";
}
*
*/
if(keyCode==42 || step==-1){
info="1:moshakhasat\nkhodro \n2:estelam taghib \n3:etelaat malek \n4:estelam khalafi";
step=0;
a="";
m_canvas.removeCommand(ersal);
m_canvas.removeCommand(virayesh);
//m_disp.setCurrent(m_canvas);
WAP.WAP_InputMethodContents("");
}
String content = WAP.GetT9String();
if(step==2){
step=3;
//tayid T9
m_canvas.addCommand(ersal);
m_canvas.addCommand(virayesh);
String n = WAP.GetT9String();
if(a.equals("11") && n.length()>7)
info = "moshakhasat\nkhodro\n\npelak:\n" + pelakSp(content);
if(a.equals("12") && n.length()>7)
info = "moshakhasat\nkhodro\n\nshomare shasi:\n" + content;
if(a.equals("13") && n.length()>7)
info = "moshakhasat\nkhodro\n\nshomare motor:\n" + content;
if(a.equals("21") && n.length()>7)
info = "estelam taghib\n\npelak:\n" + pelakSp(content);
if(a.equals("31") && n.length()>7)
info = "etelaat malek\n\npelak:\n" + pelakSp(content);
if(a.equals("41") && n.length()>7)
info = "estelam khalafi\n\npelak:\n" + pelakSp(content);
repaint();
}
if(step==1){
if(keyCode==49){
step=2;
a+="1";
//pelak
String c = info;
WAP.WAP_InputMethodContentsLength(8);
WAP.SwitchToT9InputMethod(0);
//bazgasht T9
String b = WAP.GetT9String();
repaint();
}
if(keyCode==50 && a.equals("1")){
step=2;
a+="2";
//shomare shasi0-9
String c = info;
WAP.WAP_InputMethodContentsLength(14);
WAP.SwitchToT9InputMethod(0);
//bazgasht T9
String b = com.sun.midp.io.j2me.comm.WAP.GetT9String();
}
repaint();
if(keyCode==51 && a.equals("1")){
step=2;
a+="3";
//shomare motor
String c = info;
WAP.WAP_InputMethodContentsLength(10);
WAP.SwitchToT9InputMethod(0);
//bazgasht T9
String b = com.sun.midp.io.j2me.comm.WAP.GetT9String();
repaint();
}
}
if(step==0){
if(keyCode==49){
a="1";
info="*Moshakhasat\nkhodro*\n1:Pelak\n2:Shomare Shasi\n3:Shomare Motor";
step=1;
}
if(keyCode==50){
a="2";
info="*Estelam Taghib*\n1:Pelak";
step=1;
}
if(keyCode==51){
a="3";
info="*Moshakhast Malek*\n1:Pelak";
step=1;
}
if(keyCode==52){
a="4";
info="*Estelam Khalafi*\n1:Pelak";
step=1;
}
}
repaint();
}
public void commandAction(Command c, Displayable d) {
String m = WAP.GetT9String();
SDA.SDS_SendMsg("20002",m);
info = WAP.GetT9String() + "\nersal shod";
// throw new UnsupportedOperationException("Not supported yet.");
}
}
protected void destroyApp(boolean unconditional)
throws MIDletStateChangeException {
// TODO Auto-generated method stub
notifyDestroyed();
}
protected void pauseApp() {}
protected void startApp() throws MIDletStateChangeException {
// TODO Auto-generated method stub
}
public String pelakSp(String a){
//tafkike pelak
String m = a.substring(0, 2) + " " + a.substring(2, 3) + " " + a.substring(3, 6) + "-" + a.substring(6, 8);
return m;
}
}
答案 0 :(得分：0)
尝试
this.addCommand(...)
在你的构造函数
中答案 1 :(得分：0)
我遇到了问题！ 我的画布没有使用命令监听器！ 我添加了这个并解决了：
m_canvas.setCommandListener(new CommandListener() {
public void commandAction(Command c, Displayable d) {
String m = WAP.GetT9String();
SDA.SDS_SendMsg("20002",m);
info = WAP.GetT9String() + "\nersal shod";
}
});