玩转Android---事件监听篇---第1篇

转载于： http://www.iteye.com/topic/1060325
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

Java代码  收藏代码

         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

Java代码  收藏代码

    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


Java代码  收藏代码

    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：