@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");


    
    //添加自定义按键广播----开始
    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;
      }
      
      //添加自定义按键广播----结束




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}