public class StatusBarPolicy {
 private static final String TAG = "StatusBarPolicy";
 private static StatusBarPolicy sInstance;
 .....
 // alarm clock
 // Icon lit when clock is set
 private IBinder mAlarmClockIcon;
 private IconData mAlarmClockIconData;
 //modify here start
 //HeadSet
 private IBinder mHeadSetPlugIcon;
 private IconData mHeadSetPlugIconData;
 //modify here end
 .....
 private BroadcastReceiver mIntentReceiver = new BroadcastReceiver() {
  @Override
  public void onReceive(Context context, Intent intent) {
   String action = intent.getAction();
   if (action.equals(Intent.ACTION_TIME_TICK)) {
    updateClock();
   }
   .....
   else if (action.equals(Intent.ACTION_ALARM_CHANGED)) {
    updateAlarm(intent);
   }
   //modify here start
   else if (action.equals(Intent.ACTION_HEADSET_PLUG)) {
    updateHeadset(intent);
   }
   //modify here end
   else if (action.equals(Intent.ACTION_SYNC_STATE_CHANGED)) {
    updateSyncState(intent);
   }
   ......
  };
  private StatusBarPolicy(Context context, StatusBarService service) {
  mContext = context;
  mService = service;
  mSignalStrength = new SignalStrength();
  if(FeatureOption.MTK_GEMINI_SUPPORT == true) {
   mSignalStrengthGemini = new SignalStrength();
  }
  mBatteryStats = BatteryStatsService.getService();
  ....
  //modify here start
  //HeadSet
  mHeadSetPlugIconData = IconData.makeIcon(
   "headset", 
   null,com.android.internal.R.drawable.stat_sys_headset, 0, 0);
  mHeadSetPlugIcon = service.addIcon(mHeadSetPlugIconData, null);
  service.setIconVisibility(mHeadSetPlugIcon, false);
  //modify here end
  ....
  IntentFilter filter = new IntentFilter();
  // Register for Intent broadcasts for...
  filter.addAction(Intent.ACTION_TIME_TICK);
  ....
  //modify here start
  filter.addAction(Intent.ACTION_HEADSET_PLUG);
  //modify here end
  ....
 }
 //modify here start
 private final void updateHeadset(Intent intent) {
  Slog.d(TAG, "updateHeadset: state=" + intent.getIntExtra("state", 0)); 
  mService.setIconVisibility(mHeadSetPlugIcon, (intent.getIntExtra("state", 0) == 1)?true:false);
 }
 //modify here end
 .....
}

<string-array name="status_bar_icon_order">
  <item><xliff:g id="id">clock</xliff:g></item>
  <item><xliff:g id="id">secure</xliff:g></item>
  <item><xliff:g id="id">alarm_clock</xliff:g></item>
  <item><xliff:g id="id">battery</xliff:g></item>
  <item><xliff:g id="id">phone_signal_2</xliff:g></item>
  <item><xliff:g id="id">phone_signal</xliff:g></item>
  <item><xliff:g id="id">phone_evdo_signal</xliff:g></item>
  <item><xliff:g id="id">data_connection</xliff:g></item>
  <item><xliff:g id="id">cdma_eri</xliff:g></item>
  <item><xliff:g id="id">tty</xliff:g></item>
  <item><xliff:g id="id">volume</xliff:g></item>
  <item><xliff:g id="id">mute</xliff:g></item>
  <item><xliff:g id="id">speakerphone</xliff:g></item>
  <!-- modify here start. -->
  <item><xliff:g id="id">headset</xliff:g></item>
  <!-- modify here end -->
  <item><xliff:g id="id">wifi</xliff:g></item>
  <item><xliff:g id="id">tty</xliff:g></item>
  <item><xliff:g id="id">bluetooth</xliff:g></item>
  <item><xliff:g id="id">gps</xliff:g></item>
  <item><xliff:g id="id">sync_active</xliff:g></item>
  <item><xliff:g id="id">sync_failing</xliff:g></item>
  <item><xliff:g id="id">ime</xliff:g></item>
</string-array>