当关键事件被记录时,它会打印到控制台。但不向文本区域添加任何文本。
我这里有一个框架:
public class A extends javax.swing.JFrame {
public A() {
initComponents();
}
@SuppressWarnings("unchecked")
private void initComponents() {
//code for components
}
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
try {
GlobalScreen.registerNativeHook();
}
catch (NativeHookException ex) {
System.err.println("There was a problem registering the native hook.");
System.err.println(ex.getMessage());
System.exit(1);
}
GlobalScreen.addNativeKeyListener(new GlobalKeyListenerExample());
jTextArea1.append("logging started:\n");
}
}
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new A().setVisible(true);
}
});
}
//calling this method when ever a keyevent is occured. but its not appending any text.
public void getTA(){
jTextArea1.append("something was pressed");
}
// Variables declaration - do not modify
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton2;
private javax.swing.JLabel jLabel1;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JTextArea jTextArea1;
// End of variables declaration
}
全局keylistener代码
public class GlobalKeyListenerExample implements NativeKeyListener {
A a;
public GlobalKeyListenerExample(){
a = new A();
}
public void nativeKeyPressed(NativeKeyEvent e) {
a.getTA();
System.out.println("Key Pressed: " + NativeKeyEvent.getKeyText(e.getKeyCode()));
}
public void nativeKeyReleased(NativeKeyEvent e) {
a.getTA();
System.out.println("Key Pressed: " + NativeKeyEvent.getKeyText(e.getKeyCode()));
}
public void nativeKeyTyped(NativeKeyEvent e) {
a.getTA();
System.out.println("Key Typed: " + e.getKeyText(e.getKeyCode()));
}
}
当事件发生时调用 getTA() 但没有附加任何内容。任何帮助都会很棒。
最佳答案
正如我所说,您正在 GlobalKeyListenerExample
类中创建 A 类
的新对象。因此您有 2 个框架,一个是可见的,一个是隐藏的。
当您调用a.getTA();
时,您正在调用从以下GlobalKeyListenerExample
类创建的对象。因此您将文本设置为不可见框架的jtextfield
public GlobalKeyListenerExample(){
a = new A();//invisible frame
}
那么如何解决这个问题。
一种方法是在您的类 A
中实现 NativeKeyListener
,而不创建 GlobalKeyListener
类。这样您就可以像在 中那样实现所有抽象方法GlobalKeyListener
类。
并使用GlobalScreen.addNativeKeyListener(this);
添加监听器。
示例
public class A extends javax.swing.JFrame implements NativeKeyListener {
public A() {
initComponents();
}
//implement abstract methods
@Override
public void nativeKeyPressed(NativeKeyEvent e) {
a.getTA();
System.out.println("Key Pressed: " + NativeKeyEvent.getKeyText(e.getKeyCode()));
}
public void nativeKeyReleased(NativeKeyEvent e) {
a.getTA();
System.out.println("Key Pressed: " + NativeKeyEvent.getKeyText(e.getKeyCode()));
}
public void nativeKeyTyped(NativeKeyEvent e) {
a.getTA();
System.out.println("Key Typed: " + e.getKeyText(e.getKeyCode()));
}
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
try {
GlobalScreen.registerNativeHook();
} catch (NativeHookException ex) {
System.err.println("There was a problem registering the native hook.");
System.err.println(ex.getMessage());
System.exit(1);
}
GlobalScreen.addNativeKeyListener(this);// add listner
jTextArea1.append("logging started:\n");
}
}
我无法测试此代码示例。如果您有任何问题,请询问。
关于java - JNativeHook 将键写入文本区域,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/36157630/