Android P SystemUI之StatusBar Wifi图标更新逻辑

相关源码：
\frameworks\base\packages\SystemUI\src\com\android\systemui\Dependency.java
\frameworks\base\packages\SystemUI\src\com\android\systemui\statusbar\phone\StatusBarSignalPolicy.java
\frameworks\base\packages\SystemUI\src\com\android\systemui\statusbar\phone\CollapsedStatusBarFragment.java
\frameworks\base\packages\SystemUI\src\com\android\systemui\statusbar\phone\StatusBarIconController.java
\frameworks\base\packages\SystemUI\src\com\android\systemui\statusbar\phone\StatusBarIconControllerImpl.java
\frameworks\base\packages\SystemUI\src\com\android\systemui\statusbar\policy\NetworkController.java
\frameworks\base\packages\SystemUI\src\com\android\systemui\statusbar\policy\WifiSignalController.java
\frameworks\base\packages\SystemUI\src\com\android\systemui\statusbar\policy\SignalController.java
\frameworks\base\packages\SystemUI\src\com\android\systemui\statusbar\policy\NetworkControllerImpl.java
\frameworks\base\packages\SystemUI\src\com\android\systemui\statusbar\policy\WifiIcons.java

在文章中《Android P SystemUI之StatusBar UI布局status_bar.xml解析》讲到，wifi，蓝牙等系统图标的UI是在system_icons.xml中。

system_icons.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:id="@+id/system_icons"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:gravity="center_vertical"    android:orientation="horizontal">    <com.android.systemui.statusbar.phone.StatusIconContainer         android:id="@+id/statusIcons"        android:layout_width="0dp"        android:layout_weight="1"        android:layout_height="match_parent"        android:paddingEnd="@dimen/signal_cluster_battery_padding"        android:gravity="center_vertical"        android:orientation="horizontal"/>            <com.android.systemui.BatteryMeterView         android:id="@+id/battery"        android:layout_height="match_parent"        android:layout_width="wrap_content"        android:clipToPadding="false"        android:clipChildren="false" /></LinearLayout>

关键点：android:id="@+id/statusIcons"，我需要查看是哪里加载了statusIcons。

CollapsedStatusBarFragment.java

private DarkIconManager mDarkIconManager;@Overridepublic void onViewCreated(View view, @Nullable Bundle savedInstanceState) {    super.onViewCreated(view, savedInstanceState);    mStatusBar = (PhoneStatusBarView) view;    if (savedInstanceState != null && savedInstanceState.containsKey(EXTRA_PANEL_STATE)) {        mStatusBar.go(savedInstanceState.getInt(EXTRA_PANEL_STATE));    }    mDarkIconManager = new DarkIconManager(view.findViewById(R.id.statusIcons));    mDarkIconManager.setShouldLog(true);    Dependency.get(StatusBarIconController.class).addIconGroup(mDarkIconManager);    mSystemIconArea = mStatusBar.findViewById(R.id.system_icon_area);    mClockView = mStatusBar.findViewById(R.id.clock);    showSystemIconArea(false);    showClock(false);    initEmergencyCryptkeeperText();    initOperatorName();}

关键点1： mDarkIconManager = new DarkIconManager(view.findViewById(R.id.statusIcons));
关键点2：Dependency.get(StatusBarIconController.class).addIconGroup(mDarkIconManager);

这里创建了一个DarkIconManager，添加了statusIcons的view，并且添加到StatusBarIconController中。

StatusBarIconController.java

StatusBarIconController是一个接口，并且包含一个DarkIconManager的内部类，

Dependency.java

Dependency也是在SystemBars中启动的，执行如下：

@Overridepublic void start() {//省略一部分代码//...    mProviders.put(StatusBarIconController.class, () ->            new StatusBarIconControllerImpl(mContext));//省略一部分代码//...}

我们只关心StatusBarIconController这一块，实现的是StatusBarIconControllerImpl。

StatusBarIconControllerImpl.java

private final ArrayList<IconManager> mIconGroups = new ArrayList<>();@Overridepublic void addIconGroup(IconManager group) {    mIconGroups.add(group);    List<Slot> allSlots = getSlots();    for (int i = 0; i < allSlots.size(); i++) {        Slot slot = allSlots.get(i);        List<StatusBarIconHolder> holders = slot.getHolderListInViewOrder();        boolean blocked = mIconBlacklist.contains(slot.getName());        for (StatusBarIconHolder holder : holders) {            int tag = holder.getTag();            int viewIndex = getViewIndex(getSlotIndex(slot.getName()), holder.getTag());            group.onIconAdded(viewIndex, slot.getName(), blocked, holder);        }    }}/** * Signal icons need to be handled differently, because they can be * composite views */@Overridepublic void setSignalIcon(String slot, WifiIconState state) {    int index = getSlotIndex(slot);    if (state == null) {        removeIcon(index, 0);        return;    }    StatusBarIconHolder holder = getIcon(index, 0);    if (holder == null) {        holder = StatusBarIconHolder.fromWifiIconState(state);        setIcon(index, holder);    } else {        holder.setWifiState(state);        handleSet(index, holder);    }}@Overridepublic void setIcon(int index, @NonNull StatusBarIconHolder holder) {    boolean isNew = getIcon(index, holder.getTag()) == null;    super.setIcon(index, holder);    if (isNew) {        addSystemIcon(index, holder);    } else {        handleSet(index, holder);    }}private void addSystemIcon(int index, StatusBarIconHolder holder) {    String slot = getSlotName(index);    int viewIndex = getViewIndex(index, holder.getTag());    boolean blocked = mIconBlacklist.contains(slot);    mIconLogger.onIconVisibility(getSlotName(index), holder.isVisible());    mIconGroups.forEach(l -> l.onIconAdded(viewIndex, slot, blocked, holder));}

通过setSignalIcon设置系统图标，包括Wifi，蓝牙等。

StatusBarSignalPolicy.java

    @Override    public void setWifiIndicators(boolean enabled, IconState statusIcon, IconState qsIcon,            boolean activityIn, boolean activityOut, String description, boolean isTransient,            String statusLabel) {        boolean visible = statusIcon.visible && !mBlockWifi;        boolean in = activityIn && mActivityEnabled && visible;        boolean out = activityOut && mActivityEnabled && visible;        WifiIconState newState = mWifiIconState.copy();        newState.visible = visible;        newState.resId = statusIcon.icon;        newState.activityIn = in;        newState.activityOut = out;        newState.slot = mSlotWifi;        newState.airplaneSpacerVisible = mIsAirplaneMode;        newState.contentDescription = statusIcon.contentDescription;        MobileIconState first = getFirstMobileState();        newState.signalSpacerVisible = first != null && first.typeId != 0;        updateWifiIconWithState(newState);        mWifiIconState = newState;    }    private void updateWifiIconWithState(WifiIconState state) {   if (state.visible && state.resId > 0) {       mIconController.setSignalIcon(mSlotWifi, state);       mIconController.setIconVisibility(mSlotWifi, true);   } else {       mIconController.setIconVisibility(mSlotWifi, false);   }}

setWifiIndicators()收到wifi状态变化后执行，调用updateWifiIconWithState()更新图标。

注册Wifi监听回调的地方：

public StatusBarSignalPolicy(Context context, StatusBarIconController iconController) {    mContext = context;    mSlotAirplane = mContext.getString(com.android.internal.R.string.status_bar_airplane);    mSlotMobile   = mContext.getString(com.android.internal.R.string.status_bar_mobile);    mSlotWifi     = mContext.getString(com.android.internal.R.string.status_bar_wifi);    mSlotEthernet = mContext.getString(com.android.internal.R.string.status_bar_ethernet);    mSlotVpn      = mContext.getString(com.android.internal.R.string.status_bar_);    mActivityEnabled = mContext.getResources().getBoolean(R.bool.config_showActivity);    mIconController = iconController;    mNetworkController = Dependency.get(NetworkController.class);    mSecurityController = Dependency.get(SecurityController.class);//注册wifi状态回调    mNetworkController.addCallback(this);    mSecurityController.addCallback(this);}

NetworkController,java

NetworkController包含了接口SignalCallback

WifiSignalController.java

@Overridepublic void notifyListeners(SignalCallback callback) {    // only show wifi in the cluster if connected or if wifi-only    boolean wifiVisible = mCurrentState.enabled            && (mCurrentState.connected || !mHasMobileData);    String wifiDesc = wifiVisible ? mCurrentState.ssid : null;    boolean ssidPresent = wifiVisible && mCurrentState.ssid != null;    String contentDescription = getStringIfExists(getContentDescription());    if (mCurrentState.inetCondition == 0) {        contentDescription += ("," + mContext.getString(R.string.data_connection_no_internet));    }    IconState statusIcon = new IconState(wifiVisible, getCurrentIconId(), contentDescription);    IconState qsIcon = new IconState(mCurrentState.connected, getQsCurrentIconId(),            contentDescription);    callback.setWifiIndicators(mCurrentState.enabled, statusIcon, qsIcon,            ssidPresent && mCurrentState.activityIn, ssidPresent && mCurrentState.activityOut,            wifiDesc, mCurrentState.isTransient, mCurrentState.statusLabel);}

回调执行了setWifiIndicators，去更新wifi状态。

NetworkControllerImpl.java

NetworkControllerImpl实现了接口NetworkController，并且保存了StatusBarSignalPolicy的回调对象，监听了wifi状态变化。

NetworkControllerImpl继承了BroadcastReceiver，在onReceive中接收广播。

onReceive()监听了各种状态的变化。

@Overridepublic void onReceive(Context context, Intent intent) {    if (CHATTY) {        Log.d(TAG, "onReceive: intent=" + intent);    }    final String action = intent.getAction();    switch (action) {        case ConnectivityManager.CONNECTIVITY_ACTION:        case ConnectivityManager.INET_CONDITION_ACTION:            updateConnectivity();            break;        case Intent.ACTION_AIRPLANE_MODE_CHANGED:            refreshLocale();            updateAirplaneMode(false);            break;        case TelephonyIntents.ACTION_DEFAULT_VOICE_SUBSCRIPTION_CHANGED:            // We are using different subs now, we might be able to make calls.            recalculateEmergency();            break;        case TelephonyIntents.ACTION_DEFAULT_DATA_SUBSCRIPTION_CHANGED:            // Notify every MobileSignalController so they can know whether they are the            // data sim or not.            for (int i = 0; i < mMobileSignalControllers.size(); i++) {                MobileSignalController controller = mMobileSignalControllers.valueAt(i);                controller.handleBroadcast(intent);            }            break;        case TelephonyIntents.ACTION_SIM_STATE_CHANGED:            // Avoid rebroadcast because SysUI is direct boot aware.            if (intent.getBooleanExtra(TelephonyIntents.EXTRA_REBROADCAST_ON_UNLOCK, false)) {                break;            }            // Might have different subscriptions now.            updateMobileControllers();            break;        case TelephonyIntents.ACTION_SERVICE_STATE_CHANGED:            mLastServiceState = ServiceState.newFromBundle(intent.getExtras());            if (mMobileSignalControllers.size() == 0) {                // If none of the subscriptions are active, we might need to recalculate                // emergency state.                recalculateEmergency();            }            break;        case CarrierConfigManager.ACTION_CARRIER_CONFIG_CHANGED:            mConfig = Config.readConfig(mContext);            mReceiverHandler.post(this::handleConfigurationChanged);            break;        default:            int subId = intent.getIntExtra(PhoneConstants.SUBSCRIPTION_KEY,                    SubscriptionManager.INVALID_SUBSCRIPTION_ID);            if (SubscriptionManager.isValidSubscriptionId(subId)) {                if (mMobileSignalControllers.indexOfKey(subId) >= 0) {                    mMobileSignalControllers.get(subId).handleBroadcast(intent);                } else {                    // Can't find this subscription...  We must be out of date.                    updateMobileControllers();                }            } else {                // No sub id, must be for the wifi.                mWifiSignalController.handleBroadcast(intent);            }            break;    }}

关注点： mWifiSignalController.handleBroadcast(intent);

WifiIcons.java

Wifi图标显示在WifiIcons定义如下：

public class WifiIcons {    static final int[][] WIFI_SIGNAL_STRENGTH = {            { R.drawable.stat_sys_wifi_signal_0,              R.drawable.stat_sys_wifi_signal_1,              R.drawable.stat_sys_wifi_signal_2,              R.drawable.stat_sys_wifi_signal_3,              R.drawable.stat_sys_wifi_signal_4 },            { R.drawable.stat_sys_wifi_signal_0_fully,              R.drawable.stat_sys_wifi_signal_1_fully,              R.drawable.stat_sys_wifi_signal_2_fully,              R.drawable.stat_sys_wifi_signal_3_fully,              R.drawable.stat_sys_wifi_signal_4_fully }        };    public static final int[][] QS_WIFI_SIGNAL_STRENGTH = {            { R.drawable.ic_qs_wifi_0,              R.drawable.ic_qs_wifi_1,              R.drawable.ic_qs_wifi_2,              R.drawable.ic_qs_wifi_3,              R.drawable.ic_qs_wifi_4 },            { R.drawable.ic_qs_wifi_full_0,              R.drawable.ic_qs_wifi_full_1,              R.drawable.ic_qs_wifi_full_2,              R.drawable.ic_qs_wifi_full_3,              R.drawable.ic_qs_wifi_full_4 }        };    static final int QS_WIFI_NO_NETWORK = R.drawable.ic_qs_wifi_no_network;    static final int WIFI_NO_NETWORK = R.drawable.stat_sys_wifi_signal_null;    static final int WIFI_LEVEL_COUNT = WIFI_SIGNAL_STRENGTH[0].length;}

整理一下wifi信号发生的整个流程：

NetworkControllerImpl–>WifiSignalController–>SignalController–>WifiSignalController–>StatusBarSignalPolicy–>StatusBarIconController–>StatusBarIconControllerImpl–>CollapsedStatusBarFragment–>system_icons.xml

其中WifiSignalController