java - 从外部类调用时 Java Swing 标签不更新
问题描述
我正在尝试使用来自 java swing 中的串行端口的数据更新 JTextBox。我面临的问题是 JTextBox 没有得到更新。我也尝试了 repaint() 和 revalidate 函数,但没有使用。我还尝试将 setText() 放入可运行文件中。没有任何效果。请指导我。
public class PrinterUI extends javax.swing.JFrame{
/**
* Creates new form PrinterUI
*/
public PrinterUI() {
initComponents();
initOtherUI();
}
public void initOtherUI(){
menu = new ArrayList<javax.swing.JMenuItem>();
}
public void showSensorValueOnScreen(long id, int pres, int temp){
System.out.println(Long.toHexString(id));
sensorID = id;
System.out.println(Long.toHexString(sensorID));
opText.setText(Long.toHexString(sensorID));
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jMenu3 = new javax.swing.JMenu();
jButton1 = new javax.swing.JButton();
jLabel1 = new javax.swing.JLabel();
opText = new javax.swing.JTextField();
jMenuBar1 = new javax.swing.JMenuBar();
printerMenuBar = new javax.swing.JMenu();
mobileMenuBar = new javax.swing.JMenu();
jMenu3.setText("jMenu3");
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jButton1.setText("Print");
jButton1.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
jButton1MouseClicked(evt);
}
});
jLabel1.setText("Sensor Output");
opText.setText("jTextField1");
opText.addPropertyChangeListener(new java.beans.PropertyChangeListener() {
public void propertyChange(java.beans.PropertyChangeEvent evt) {
opTextPropertyChange(evt);
}
});
printerMenuBar.setText("Printer");
printerMenuBar.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
printerMenuBarMouseClicked(evt);
}
public void mouseEntered(java.awt.event.MouseEvent evt) {
printerMenuBarMouseEntered(evt);
}
});
jMenuBar1.add(printerMenuBar);
mobileMenuBar.setText("Mobile");
jMenuBar1.add(mobileMenuBar);
setJMenuBar(jMenuBar1);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(203, 203, 203)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(opText, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel1)
.addComponent(jButton1))
.addContainerGap(236, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addContainerGap(108, Short.MAX_VALUE)
.addComponent(jLabel1)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(opText, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(52, 52, 52)
.addComponent(jButton1)
.addGap(105, 105, 105))
);
getAccessibleContext().setAccessibleName("jLabel1");
pack();
}// </editor-fold>
private void printerMenuBarMouseClicked(java.awt.event.MouseEvent evt) {
System.out.println("clicked");
}
private void printerMenuBarMouseEntered(java.awt.event.MouseEvent evt) {
String[] portNames = null;
portNames = SerialPortList.getPortNames();
for (String string : portNames) {
System.out.println(string);
}
if (portNames.length == 0) {
System.out.println("There are no serial-ports");
} else {
SerialPort serialPort = new SerialPort("COM25");
try {
serialPort.openPort();
serialPort.setParams(SerialPort.BAUDRATE_9600, SerialPort.DATABITS_8, SerialPort.STOPBITS_1,
SerialPort.PARITY_NONE);
serialPort.setFlowControlMode(SerialPort.FLOWCONTROL_RTSCTS_IN | SerialPort.FLOWCONTROL_RTSCTS_OUT);
PortReader portReader = new PortReader(serialPort);
serialPort.addEventListener(portReader, SerialPort.MASK_RXCHAR);
} catch (Exception e) {
System.out.println("There are an error on writing string to port т: " + e);
}
}
}
private void jButton1MouseClicked(java.awt.event.MouseEvent evt) {
// TODO add your handling code here:
System.out.println("Print Click");
opText.setText(Long.toString(sensorID));
System.out.println(Long.toHexString(sensorID));
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(PrinterUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(PrinterUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(PrinterUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(PrinterUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new PrinterUI().setVisible(true);
}
});
}
private List<javax.swing.JMenuItem> menu;
PrintService pservice = null;
public static long sensorID;
// Variables declaration - do not modify
private javax.swing.JButton jButton1;
private javax.swing.JLabel jLabel1;
private javax.swing.JMenu jMenu3;
private javax.swing.JMenuBar jMenuBar1;
private javax.swing.JMenu mobileMenuBar;
private javax.swing.JTextField opText;
private javax.swing.JMenu printerMenuBar;
// End of variables declaration
}
class PortReader implements SerialPortEventListener{
SerialPort serialPort;
public int[] incomingData = new int[20];
public int dataIndex=0;
public long sensorID=0;
public int pressure;
public int temperature;
public PortReader(SerialPort serialPort) {
this.serialPort = serialPort;
}
@Override
public void serialEvent(SerialPortEvent event) {
if (event.isRXCHAR() && event.getEventValue() > 0) {
try {
String receivedData = serialPort.readHexString();
for(int x=0;x<receivedData.length();x=x+2){
int data = Integer.parseInt(receivedData.substring(x, x+2),16);
//System.out.println(data);
if((dataIndex==0)&&(data==170)){
incomingData[dataIndex++]=data;
}else if(dataIndex>0){
incomingData[dataIndex++]=data;
if(dataIndex>=14){
dataIndex=0;
long tyreId =(long)(((int)incomingData[6])*16777216 + ((int)incomingData[7])*65536 + ((int)incomingData[8])*256 + ((int)incomingData[9]));
tyreId = tyreId & 0x00000000FFFFFFFFL;
int press = incomingData[10];
int temp = incomingData[11];
sensorID = tyreId;
pressure = press;
temperature = temp;
PrinterUI obj = new PrinterUI();
obj.showSensorValueOnScreen(sensorID, pressure, temperature);
System.out.println("ID: " + Long.toHexString(tyreId) + ", Pressure: " + pressure + ", Temperature: " + temperature);
}
}else{
dataIndex=0;
}
}
} catch (SerialPortException ex) {
System.out.println("Error in receiving string from COM-port: " + ex);
}
}
}
}
当接收到串行数据时,在 PortReader 类中调用 serialEvent,该类依次调用 PrinterUI 类中的 showSensorValueOnScreen() 方法。JTextBox 小部件没有得到更新。
但是当按下 UI 上的按钮时,JTextBox 会更新。
为什么我从课外调用它时它没有更新?请帮帮我。
解决方案
我发现了这个问题。我正在尝试通过为 UI 创建一个新对象来从另一个类更新 UI。实际的 UI 是使用不同的对象从 void main 创建的。
我通过将现有对象传递给调用 UI 更新函数的类来解决它。
谢谢你的帮助。
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