Android P SystemUI之StatusBar Wifi图标更新逻辑

秒速五厘米 2021-10-14 20:31 1112阅读 0赞

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》][Android P SystemUI_StatusBar UI_status_bar.xml]讲到，wifi，蓝牙等系统图标的UI是在system\_icons.xml中。

### system\_icons.xml ###

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

### CollapsedStatusBarFragment.java ###

private DarkIconManager mDarkIconManager;
    @Override
    public 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：

@Override
    public 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<>();
    @Override
    public 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 */
    @Override
    public 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);
        }
    }
    
    @Override
    public 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_vpn);
        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 ###

@Override
    public 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。

@Override
    public 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

[Android P SystemUI_StatusBar UI_status_bar.xml]: https://blog.csdn.net/Sunxiaolin2016/article/details/99574563