@Override  public long interceptKeyBeforeDispatching(WindowState win, KeyEvent event, int policyFlags) {    final boolean keyguardOn = keyguardOn();    final int keyCode = event.getKeyCode();    final int repeatCount = event.getRepeatCount();    final int metaState = event.getMetaState();    final int flags = event.getFlags();    final boolean down = event.getAction() == KeyEvent.ACTION_DOWN;    final boolean canceled = event.isCanceled();    final boolean longPress = (flags & KeyEvent.FLAG_LONG_PRESS) != 0;    final boolean virtualKey = event.getDeviceId() == KeyCharacterMap.VIRTUAL_KEYBOARD;    final String isCitKeyTest=SystemProperties.get("persist.sys.startCitKeyTest");        //添加自定義按鍵廣播----開始    switch (keyCode)      {        case 135:        case 136:        case 137:        case 139:        {          if (repeatCount == 0) {                        Intent myKeyIntent = new Intent();                                    if(down)            {              myKeyIntent.setAction("com.rscja.android.KEY_DOWN");            }            else            {              myKeyIntent.setAction("com.rscja.android.KEY_UP");            }                                  myKeyIntent.putExtra("keycode", keyCode);                        mContext.sendBroadcastAsUser(myKeyIntent, UserHandle.ALL);                                             }        }                                  break;      }            //添加自定義按鍵廣播----結束……………………}