当我按下“选择”或箭头按钮时，ActionListener 没有收到任何操作执行事件
我不明白为什么它没有收到操作事件。我按下箭头并选择按钮，但仍然没有任何内容输出到控制台。
import com.sun.lwuit.events.*;
public class LWUITAPP extends javax.microedition.midlet.MIDlet implements ActionListener, CommandListener {
Form form = new Form();
form.show();
form.addComponent(list);
list.setModel(model);
}
public void pauseApp() {
}
public void destroyApp(boolean unconditional) {
}
public void actionPerformed(ActionEvent evt) {
System.out.println ("hii!");
System.out.println(evt.getKeyEvent());
}
public void commandAction(Command c, Displayable d) {
}
}
I can't figure out why it isn't receiving the action event. I push the arrows and select button and still nothing gets output to the console.
import com.sun.lwuit.events.*;
public class LWUITAPP extends javax.microedition.midlet.MIDlet implements ActionListener, CommandListener {
Form form = new Form();
form.show();
form.addComponent(list);
list.setModel(model);
}
public void pauseApp() {
}
public void destroyApp(boolean unconditional) {
}
public void actionPerformed(ActionEvent evt) {
System.out.println ("hii!");
System.out.println(evt.getKeyEvent());
}
public void commandAction(Command c, Displayable d) {
}
}
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评论（2）
您忘记将
keyListener放入Form中。您必须将此 addKeyListener/addGameKeyListener 附加到Form。这应该有效。You forget to put the
keyListenerto theForm. You must put this addKeyListener/addGameKeyListener attached to theForm. This should work.好吧：我会尽力保留它 SSCCE。
为了注册事件，您必须添加行...
...以便通过您的actionPerformed 方法监听事件。
作为我的证明，请查看 LWUIT API 上的此页面。
https:// /lwuit.java.net/javadocs/com/sun/lwuit/Form.html#addCommandListener(com.sun.lwuit.events.ActionListener)
有趣的是，addCommandListener() 方法的实现取代了 Swing 应用程序中通常使用的 addActionListener() 方法。
All right: I will try to keep it SSCCE.
In order to have events registered, you must add the line...
...in order to listen to events through your actionPerformed method.
As my proof, take a look at this page on the LWUIT API.
https://lwuit.java.net/javadocs/com/sun/lwuit/Form.html#addCommandListener(com.sun.lwuit.events.ActionListener)
Interestingly, the addCommandListener() method is implemented in place of where addActionListener() would normally be used in the case of Swing applications.