[Galaxy S II Android Development] :
I don't see anything about wifi in tw_status_bar.xml

<?xml version="1.0" encoding="utf-8"?>
<com.android.systemui.statusbar.phone.PhoneStatusBarView android:orientation="vertical" android:id="@id/status_bar" android:background="#00000000" android:focusable="true" android:fitsSystemWindows="true" android:descendantFocusability="afterDescendants"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:systemui="http://schemas.android.com/apk/res/com.android.systemui">
<potato.mariozawa.statusbargradient.Gradient android:gravity="center" android:orientation="horizontal" android:layout_width="fill_parent" android:layout_height="fill_parent" />
<ImageView android:id="@id/notification_lights_out" android:paddingLeft="3.0dip" android:paddingBottom="2.0dip" android:visibility="gone" android:layout_width="@dimen/status_bar_icon_size" android:layout_height="fill_parent" android:src="@drawable/ic_sysbar_lights_out_dot_small" android:scaleType="center" />
<RelativeLayout android:id="@id/icons" android:paddingLeft="0.0dip" android:paddingRight="0.0dip" android:layout_width="fill_parent" android:layout_height="fill_parent">
<com.android.systemui.statusbar.policy.ClockLeft android:textSize="@dimen/status_bar_clock_text_size" android:textColor="#ffffffff" android:ellipsize="none" android:gravity="left|center" android:id="@id/left_clock" android:paddingLeft="3.0dip" android:layout_width="wrap_content" android:layout_height="fill_parent" android:singleLine="true" android:includeFontPadding="false" android:layout_alignParentLeft="true" />
<LinearLayout android:orientation="horizontal" android:id="@id/left_icons" android:paddingLeft="3.0dip" android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_toLeftOf="@id/center_clock" android:layout_toRightOf="@id/left_clock" android:layout_alignWithParentIfMissing="true">
<TextView android:textSize="15.0dip" android:gravity="center_vertical" android:id="@id/carrierLabel" android:visibility="visible" android:layout_width="wrap_content" android:layout_height="fill_parent" android:singleLine="true" />
<ImageView android:id="@id/operatorLogoIcon" android:visibility="gone" android:layout_width="wrap_content" android:layout_height="fill_parent" android:src="@drawable/tw_stat_notify_operator_logo" />
<ImageView android:id="@id/doNotDisturbIcon" android:visibility="gone" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/tw_dnd" android:alpha="1.0" android:scaleX="0.85" android:scaleY="0.85" />
<com.android.systemui.statusbar.StatusBarIconView android:id="@id/moreIcon" android:visibility="gone" android:layout_width="@dimen/status_bar_icon_size" android:layout_height="fill_parent" android:src="@drawable/stat_notify_more" />
<com.android.systemui.statusbar.phone.IconMerger android:gravity="center_vertical" android:orientation="horizontal" android:id="@id/notificationIcons" android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_alignParentLeft="true" />
</LinearLayout>
<FrameLayout android:gravity="center" android:orientation="horizontal" android:id="@id/power_button_sb" android:layout_width="wrap_content" android:layout_height="fill_parent" android:layout_centerInParent="true">
<com.android.systemui.statusbar.policy.KeyButtonView android:gravity="left|center" android:id="@id/back" android:layout_width="wrap_content" android:layout_height="fill_parent" android:src="@drawable/sale_trans" android:contentDescription="@string/accessibility_back" systemui:keyCode="26" systemui:glowBackground="@drawable/sale_trans" />
</FrameLayout>
<com.android.systemui.statusbar.policy.ClockCenter android:textSize="@dimen/status_bar_clock_text_size" android:textColor="#ffffffff" android:ellipsize="none" android:gravity="left|center" android:id="@id/center_clock" android:paddingLeft="3.0dip" android:layout_width="wrap_content" android:layout_height="fill_parent" android:singleLine="true" android:layout_centerInParent="true" />
<LinearLayout android:orientation="horizontal" android:id="@id/right_icons" android:paddingRight="0.0dip" android:layout_width="wrap_content" android:layout_height="fill_parent" android:layout_alignParentRight="true">
<LinearLayout android:gravity="center_vertical" android:orientation="horizontal" android:id="@id/statusIcons" android:layout_width="wrap_content" android:layout_height="fill_parent" />
<FrameLayout android:id="@id/traffic_meter_sb" android:layout_width="wrap_content" android:layout_height="fill_parent">
<com.android.systemui.statusbar.policy.Traffic android:textAppearance="@style/TextAppearance.StatusBar.Traffic" android:textSize="13.0dip" android:gravity="left|center" android:id="@id/traffic" android:layout_width="wrap_content" android:layout_height="fill_parent" android:singleLine="true" />
</FrameLayout>
<LinearLayout android:gravity="center" android:orientation="horizontal" android:id="@id/signal_battery_cluster" android:paddingLeft="2.0dip" android:layout_width="wrap_content" android:layout_height="fill_parent">
<include android:id="@id/signal_cluster" android:layout_width="wrap_content" android:layout_height="wrap_content" layout="@layout/tw_signal_cluster_view" />
<com.erryy.BatteryText android:textSize="13.0dip" android:gravity="left|center" android:layout_width="wrap_content" android:layout_height="fill_parent" android:layout_marginRight="-5.0dip" android:singleLine="true" />
<include android:id="@id/battery_cluster" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginRight="-3.5dip" layout="@layout/battery_cluster_view" />
<TextView android:textSize="12.0dip" android:textColor="#ffffffff" android:layout_gravity="center" android:id="@id/battery_text" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/status_bar_network_name_separator" />
<ImageView android:gravity="center" android:id="@id/battery" android:layout_width="wrap_content" android:layout_height="wrap_content" />
</LinearLayout>
<com.android.systemui.statusbar.policy.Clock android:textSize="@dimen/status_bar_clock_text_size" android:textColor="#ffffffff" android:ellipsize="none" android:gravity="left|center" android:id="@id/clock" android:paddingLeft="3.0dip" android:paddingRight="2.0dip" android:layout_width="wrap_content" android:layout_height="fill_parent" android:singleLine="true" android:includeFontPadding="false" />
</LinearLayout>
</RelativeLayout>
<LinearLayout android:orientation="horizontal" android:id="@id/ticker" android:paddingLeft="3.0dip" android:animationCache="false" android:layout_width="fill_parent" android:layout_height="fill_parent">
<ImageSwitcher android:id="@id/tickerIcon" android:layout_width="@dimen/status_bar_icon_size" android:layout_height="@dimen/status_bar_icon_size" android:layout_marginRight="4.0dip">
<com.android.systemui.statusbar.AnimatedImageView android:layout_width="@dimen/status_bar_icon_size" android:layout_height="@dimen/status_bar_icon_size" android:scaleType="centerInside" />
<com.android.systemui.statusbar.AnimatedImageView android:layout_width="@dimen/status_bar_icon_size" android:layout_height="@dimen/status_bar_icon_size" android:scaleType="centerInside" />
</ImageSwitcher>
<com.android.systemui.statusbar.phone.TickerView android:id="@id/tickerText" android:paddingTop="2.0dip" android:paddingRight="0.0dip" android:layout_width="0.0dip" android:layout_height="wrap_content" android:layout_weight="1.0">
<TextView android:textAppearance="@style/TextAppearance.StatusBar.PhoneTicker" android:id="@id/ticker_text_view_old" android:layout_width="fill_parent" android:layout_height="wrap_content" android:singleLine="true" />
<TextView android:textAppearance="@style/TextAppearance.StatusBar.PhoneTicker" android:id="@id/ticker_text_view_new" android:layout_width="fill_parent" android:layout_height="wrap_content" android:singleLine="true" />
</com.android.systemui.statusbar.phone.TickerView>
</LinearLayout>
<com.android.systemui.statusbar.policy.BatteryBarController android:visibility="gone" android:layout_width="fill_parent" android:layout_height="1.0dip" android:layout_alignParentTop="true" systemui:viewLocation="1" />
</com.android.systemui.statusbar.phone.PhoneStatusBarView>