玩转Android---事件监听篇---第1篇

事件就是用户与UI界面的交互时所触发的操作。比如点击某一个按钮，会触发一个事件等

1、最长用的按钮事件：OnClickListener

      mybutton = (Button)findViewById(R.id.mybutton);
      mybutton.setOnClickListener(new Button.OnClickListener()
      {

 @Override
 public void onClick(View arg0) {
     // TODO Auto-generated method stub
     ShowMessage("点击了Button按钮");
 }

      });

 

 

 

2、我们还可以自定义KeyEvent，比如

 public boolean onKeyDown(int keyCode, KeyEvent event)
 {
     /**
      * 这里构建KeyEvent对象，功能为返回键的功能
      * 即我们按任意键都是返回键功能
      */
     KeyEvent key = new KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_BACK);
     return super.onKeyDown(keyCode, event);
 }

 

 

 

3、手机按键的事件处理

Boolean onKeyDown(int keyCode, KeyEvent event)：相应按键按下

Boolean onKeyUp(int keyCode, KeyEvent event)：相应按键释放

Boolean onKeyMultiple()：相应按键重复点击

Boolean onTouchEvent(MotionEvent event)：相应触屏事件

 

 package org.hualang.eventtest01;

 import android.app.Activity;
 import android.os.Bundle;
 import android.view.KeyEvent;
 import android.view.MotionEvent;
 import android.view.View;
 import android.widget.Button;
 import android.widget.Toast;

 public class EventTest01 extends Activity {
     /**
      * 注意，要重写onKeyDown,onKeyUp,onTouchEvent方法
      */
     private Button mybutton;
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.main);
         mybutton = (Button)findViewById(R.id.mybutton);
         mybutton.setOnClickListener(new Button.OnClickListener()
         {

             @Override
             public void onClick(View arg0) {
                 // TODO Auto-generated method stub
                 ShowMessage("点击了Button按钮");
             }

         });

     }
     /**按键按下触发的事件*/
     public boolean onKeyDown(int keyCode, KeyEvent event)
     {
         switch(keyCode)
         {
         case KeyEvent.KEYCODE_DPAD_CENTER:
             ShowMessage("按下:中键");break;
         case KeyEvent.KEYCODE_DPAD_UP:
             ShowMessage("按下:上方向键");break;
         case KeyEvent.KEYCODE_DPAD_DOWN:
             ShowMessage("按下:下方向键");break;
         case KeyEvent.KEYCODE_DPAD_LEFT:
             ShowMessage("按下:左方向键");break;
         case KeyEvent.KEYCODE_DPAD_RIGHT:
             ShowMessage("按下:右方向键");break;
         }
         return super.onKeyDown(keyCode, event);
     }

     /**按键弹起所触发的事件*/
     public boolean onKeyUp(int keyCode, KeyEvent event)
     {
         switch(keyCode)
         {
         case KeyEvent.KEYCODE_DPAD_CENTER:
             ShowMessage("弹起:中键");
             break;
         case KeyEvent.KEYCODE_DPAD_DOWN:
             ShowMessage("弹起:下方向键");
             break;
         case KeyEvent.KEYCODE_DPAD_UP:
             ShowMessage("弹起:上方向键");
             break;
         case KeyEvent.KEYCODE_DPAD_LEFT:
             ShowMessage("弹起：左方向键");
             break;
         case KeyEvent.KEYCODE_DPAD_RIGHT:
             ShowMessage("弹起:右方向键");
             break;
         }
         return super.onKeyUp(keyCode, event);
     }

    /**按键重复点击事件*/
     public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event)
     {
         return onKeyMultiple(keyCode, repeatCount, event);
     }

     /**触屏事件*/
     public boolean onTouchEvent(MotionEvent event)
     {
         int action = event.getAction();
         if(action ==  MotionEvent.ACTION_CANCEL||action == MotionEvent.ACTION_DOWN||action == MotionEvent.ACTION_MOVE)
         {
             return false;
         }
         //得到触点的位置
         String x = String.valueOf(event.getX());
         String y = String.valueOf(event.getX());

         ShowMessage("触点坐标：(" + x + "," + y +")");
         return super.onTouchEvent(event);
     }

     /**显示触发事件的信息*/
     public void ShowMessage(String str)
     {
         Toast toast = Toast.makeText(this, str, Toast.LENGTH_SHORT);
         toast.show();
     }
 }

 

运行结果如下：