android 按键事件响应和笔触事件响应

一、            按下按键触发事件：

    // 按键按下触发事件

    public boolean onKeyDown(int keyCode, KeyEvent event) {

       switch (keyCode) {

       case KeyEvent.KEYCODE_DPAD_CENTER:

           DisplayToast("按下：中键");

           break;

       case KeyEvent.KEYCODE_DPAD_UP:

           DisplayToast("按下：向上键");

           break;

       case KeyEvent.KEYCODE_DPAD_DOWN:

           DisplayToast("按下：下方键");

           break;

       case KeyEvent.KEYCODE_DPAD_LEFT:

           DisplayToast("按下：左方键");

           break;

       case KeyEvent.KEYCODE_DPAD_RIGHT:

           DisplayToast("按下：右方键");

           break;

       }

 

       return super.onKeyDown(keyCode, event);

    }

 

二、            弹起按键触发事件：

// 按键弹起触发事件

    public boolean onKeyUp(int keyCode, KeyEvent event) {

       switch (keyCode) {

       case KeyEvent.KEYCODE_DPAD_CENTER:

           DisplayToast("弹起：中键");

           break;

       case KeyEvent.KEYCODE_DPAD_UP:

           DisplayToast("弹起：向上键");

           break;

       case KeyEvent.KEYCODE_DPAD_DOWN:

           DisplayToast("弹起：下方键");

           break;

       case KeyEvent.KEYCODE_DPAD_LEFT:

           DisplayToast("弹起：左方键");

           break;

       case KeyEvent.KEYCODE_DPAD_RIGHT:

           DisplayToast("弹起：右方键");

           break;

       }

 

       return super.onKeyUp(keyCode, event);

    }

 

三、            笔触事件响应

   // 笔触事件

    public boolean onTouchEvent(MotionEvent event) {

       int iAction = event.getAction();

       if (iAction == MotionEvent.ACTION_CANCEL

              || iAction == MotionEvent.ACTION_DOWN

              || iAction == MotionEvent.ACTION_MOVE) {

           return false;

       }

       int x = (int) event.getX();

       int y = (int) event.getY();

 

       DisplayToast("触笔点击坐标：（" + Integer.toString(x) + ","

              + Integer.toString(y) + "）");

 

       return super.onTouchEvent(event);

    }

 

四、            onKeyMultiple

指多个连续的重复事件，可拆开为多个上面的ACTION_DOWN和ACTION_UP理解，直接接收到ACTION_MULTIPLE这个KeyEvent的时候，onKeyMultiple才会触发

public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) {

       return super.onKeyMultiple(keyCode, repeatCount, event);

}

 

五、            构造返回键

public boolean onKeyDown(int keyCode,KeyEvent event){

    KeyEvent key = new KeyEvent(KeyEvent.ACTION_DOWN,KeyEvent.KEYCODE_BACK);

    return super.onKeyDown(key.getkeyCode(),key);

}