@Override 
   public void onAttachedToWindow() { 
       // TODO Auto-generated method stub 
       Log.d("aeon","onAttachedToWindow"); 
       this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD);  
       super.onAttachedToWindow(); 
   } 

<uses-permission android:name="android.permission.DISABLE_KEYGUARD" > 
   </uses-permission> 

protected void onSaveInstanceState(Bundle outState) 

@Override 
    protected void onUserLeaveHint() { 
        Log.d("aeon","onUserLeaveHint"); 
        super.onUserLeaveHint(); 
    } 

//注冊Receiver 
  
              HomeKeyEventBroadCastReceiver receiver = new HomeKeyEventBroadCastReceiver(); 
             registerReceiver(receiver, new IntentFilter( 
                           Intent. ACTION_CLOSE_SYSTEM_DIALOGS)); 

private void handleLongPressOnHome() { 
        // We can't initialize this in init() since the configuration hasn't been loaded yet. 
        if (mLongPressOnHomeBehavior < 0) { 
            mLongPressOnHomeBehavior 
                    = mContext.getResources().getInteger(R.integer.config_longPressOnHomeBehavior); 
            if (mLongPressOnHomeBehavior < LONG_PRESS_HOME_NOTHING || 
                    mLongPressOnHomeBehavior > LONG_PRESS_HOME_RECENT_SYSTEM_UI) { 
                mLongPressOnHomeBehavior = LONG_PRESS_HOME_NOTHING; 
            } 
        } 
 
        if (mLongPressOnHomeBehavior != LONG_PRESS_HOME_NOTHING) { 
            performHapticFeedbackLw(null, HapticFeedbackConstants.LONG_PRESS, false); 
            sendCloseSystemWindows(SYSTEM_DIALOG_REASON_RECENT_APPS); 
 
            // Eat the longpress so it won't dismiss the recent apps dialog when 
            // the user lets go of the home key 
            mHomeLongPressed = true; 
        } 
 
        if (mLongPressOnHomeBehavior == LONG_PRESS_HOME_RECENT_DIALOG) { 
            showOrHideRecentAppsDialog(RECENT_APPS_BEHAVIOR_SHOW_OR_DISMISS); 
        } else if (mLongPressOnHomeBehavior == LONG_PRESS_HOME_RECENT_SYSTEM_UI) { 
            try { 
                IStatusBarService statusbar = getStatusBarService(); 
                if (statusbar != null) { 
                    statusbar.toggleRecentApps(); 
                } 
            } catch (RemoteException e) { 
                Slog.e(TAG, "RemoteException when showing recent apps", e); 
                // re-acquire status bar service next time it is needed. 
                mStatusBarService = null; 
            } 
        } 
    }