Android开发笔记整理

事件三要素：事件源->监听器->事件

package com.event.test;

import java.awt.Button;

import java.awt.Frame;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

public class EventTest {
public static void main(String[] args) {
Frame f = new Frame();
Button b = new Button("click me!");
//事件源->事件监听器->事件
b.addActionListener(new ActionListener(){
@Override
public void actionPerformed(ActionEvent e) {
System.out.println("Test.....");

}
});
f.add(b);
f.setSize(200,200);
f.setVisible(true);

}

}

//点击按钮改变模板颜色

package com.event.test;

import java.awt.Button;

import java.awt.Color;

import java.awt.Frame;

import java.awt.Panel;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

public class EventTest {
public static void main(String[] args) {
Frame f = new Frame();

final Panel p = new Panel();
Button red = new Button("red");
Button blue = new Button("blue");
Button black = new Button("black");

red.addActionListener(new ActionListener(){

@Override
public void actionPerformed(ActionEvent e) {
p.setBackground(Color.red);

}

});
blue.addActionListener(new ActionListener(){

@Override
public void actionPerformed(ActionEvent e) {
p.setBackground(Color.blue);

}

});
black.addActionListener(new ActionListener(){

@Override
public void actionPerformed(ActionEvent e) {
p.setBackground(Color.black);

}

});
p.add(red);
p.add(blue);
p.add(black);

f.add(p);
f.setSize(200,200);
f.setVisible(true);

}

}

事件处理机制：

委派式事件处理机制（代理机制）

1.Item  下拉框

package com.event.test;

import java.awt.Choice;

import java.awt.Frame;

import java.awt.event.ItemEvent;

import java.awt.event.ItemListener;

/**

 * Item  下拉框

 * @author ken

 *

 */

public class EventTest {
public static void main(String[] args) {
Frame f = new Frame();

Choice c = new Choice();
c.addItem("red");
c.addItem("yellow");
c.addItem("blue");

c.addItemListener(new ItemListener(){

@Override
public void itemStateChanged(ItemEvent e) {
System.out.println("changed");

}

});

f.add(c);
f.setSize(200,200);
f.setVisible(true);

}

}

2. Mousemotion 鼠标事件

package com.event.test;

import java.awt.Frame;

import java.awt.event.MouseEvent;

import java.awt.event.MouseMotionListener;

/**

 * Mousemotion 鼠标事件

 * @author ken

 *

 */

public class EventTest {
public static void main(String[] args) {
Frame f = new Frame();
f.addMouseMotionListener(new MouseMotionListener(){

@Override
public void mouseDragged(MouseEvent e) {
System.out.println("Mouse Dragged");

}

@Override
public void mouseMoved(MouseEvent e) {
System.out.println("Mouse Moved");

}

});

f.setSize(200,200);
f.setVisible(true);

}

}

3.package com.event.test;

import java.awt.Frame;

import java.awt.event.MouseEvent;

import java.awt.event.MouseListener;

/**

 * Mouse 鼠标事件

 * @author ken

 *

 */

public class EventTest {
public static void main(String[] args) {
Frame f = new Frame();
f.addMouseListener(new MouseListener(){

@Override
public void mouseClicked(MouseEvent e) {
System.out.println("mouse Clicked");

}

@Override
public void mousePressed(MouseEvent e) {
System.out.println("mouse Pressed");

}

@Override
public void mouseReleased(MouseEvent e) {
System.out.println("mouse Released");

}

@Override
public void mouseEntered(MouseEvent e) {
System.out.println("mouse Entered");

}

@Override
public void mouseExited(MouseEvent e) {
System.out.println("mouse Exited");

}

});

f.setSize(200,200);
f.setVisible(true);

}

}

4.key 键盘事件

package com.event.test;

import java.awt.Frame;

import java.awt.event.KeyEvent;

import java.awt.event.KeyListener;

/**

 * key 键盘事件

 * @author ken

 *

 */

public class EventTest {
public static void main(String[] args) {
Frame f = new Frame();
f.addKeyListener(new KeyListener(){

@Override
public void keyTyped(KeyEvent e) {
// TODO Auto-generated method stub

}

@Override
public void keyPressed(KeyEvent e) {
if(e.getKeyCode()==KeyEvent.VK_UP){
System.out.println("up");
}else if(e.getKeyCode()==KeyEvent.VK_DOWN){
System.out.println("down");
}else if(e.getKeyCode()==KeyEvent.VK_LEFT){
System.out.println("left");
}else if(e.getKeyCode()==KeyEvent.VK_RIGHT){
System.out.println("right");
}

}

@Override
public void keyReleased(KeyEvent e) {
// TODO Auto-generated method stub

}

});

f.setSize(200,200);
f.setVisible(true);

}

}

5.键盘事件+窗口关闭

package com.event.test;

import java.awt.Frame;

import java.awt.event.KeyEvent;

import java.awt.event.KeyListener;

import java.awt.event.WindowEvent;

import java.awt.event.WindowListener;

/**

 * key 键盘事件+窗口关闭

 * @author ken

 *

 */

public class EventTest {
public static void main(String[] args) {
Frame f = new Frame();

f.addWindowListener(new WindowListener(){

@Override
public void windowOpened(WindowEvent e) {
System.out.println("已经打开窗口");

}

@Override
public void windowClosing(WindowEvent e) {
System.exit(0);
}

@Override
public void windowClosed(WindowEvent e) {

}

@Override
public void windowIconified(WindowEvent e) {
// TODO Auto-generated method stub

}

@Override
public void windowDeiconified(WindowEvent e) {
// TODO Auto-generated method stub

}

@Override
public void windowActivated(WindowEvent e) {
// TODO Auto-generated method stub

}

@Override
public void windowDeactivated(WindowEvent e) {
// TODO Auto-generated method stub

}

});
f.addKeyListener(new KeyListener(){

@Override
public void keyTyped(KeyEvent e) {
// TODO Auto-generated method stub

}

@Override
public void keyPressed(KeyEvent e) {
if(e.getKeyCode()==KeyEvent.VK_UP){
System.out.println("up");
}else if(e.getKeyCode()==KeyEvent.VK_DOWN){
System.out.println("down");
}else if(e.getKeyCode()==KeyEvent.VK_LEFT){
System.out.println("left");
}else if(e.getKeyCode()==KeyEvent.VK_RIGHT){
System.out.println("right");
}

}

@Override
public void keyReleased(KeyEvent e) {
// TODO Auto-generated method stub

}

});

f.setSize(200,200);
f.setVisible(true);

}

}

6.文本监听事件+回车键发送消息功能

package com.event.test;

import java.awt.BorderLayout;

import java.awt.Button;

import java.awt.Frame;

import java.awt.Panel;

import java.awt.TextArea;

import java.awt.TextField;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.KeyEvent;

import java.awt.event.KeyListener;

/**

 * TextListener 文本监听事件+回车键发送消息功能

 * @author ken

 *

 */

public class EventTest {
public static void main(String[] args) {
Frame f = new Frame();

final TextField tf = new TextField(30);
Button send= new Button("send");
final TextArea ta = new TextArea();

tf.addKeyListener(new KeyListener(){
@Override
public void keyTyped(KeyEvent e) {}

@Override
public void keyPressed(KeyEvent e) {
if(e.getKeyCode()==KeyEvent.VK_ENTER){
String str = tf.getText();
ta.append("KEN:\n"+str+"\n\r");
}
}

@Override
public void keyReleased(KeyEvent e) {}

});

send.addActionListener(new ActionListener(){
@Override
public void actionPerformed(ActionEvent e) {
String str = tf.getText();

// ta.setText(str);
ta.append("KEN:\n"+str+"\n\r");
}
});

Panel p = new Panel();
   p.add(tf);
   p.add(send);
f.add(p,BorderLayout.SOUTH);

f.add(ta,BorderLayout.NORTH);
f.setSize(400,300);
f.setVisible(true);

}

}

适配器（变压器）

package com.event.test;

import java.awt.Frame;

import java.awt.event.WindowEvent;

import java.awt.event.WindowListener;

/**

 * TextListener 文本监听事件+回车键发送消息功能

 * @author ken

 *

 */

public class EventTest {
public static void main(String[] args) {
Frame f = new Frame();
f.addWindowListener(new MyAdapter());

f.setSize(400,300);
f.setVisible(true);

}

}

class MyAdapter extends MyListener{   //取其中一个方法windowClosing并定义
@Override
public void windowClosing(WindowEvent e) {
System.exit(0);
}

}

class  MyListener implements WindowListener{

@Override
public void windowOpened(WindowEvent e) {
}

@Override
public void windowClosing(WindowEvent e) {
}

@Override
public void windowClosed(WindowEvent e) {
}

@Override
public void windowIconified(WindowEvent e) {
}

@Override
public void windowDeiconified(WindowEvent e) {
}

@Override
public void windowActivated(WindowEvent e) {
}

@Override
public void windowDeactivated(WindowEvent e) {
}

}