Android P SystemUI之StatusBar加载流程

相关源码：
\frameworks\base\packages\SystemUI\src\com\android\systemui\statusbar\phone\StatusBar.java
\frameworks\base\packages\SystemUI\src\com\android\systemui\statusbar\phone\StatusBarWindowManager.java
\frameworks\base\packages\SystemUI\src\com\android\systemui\statusbar\phone\StatusBarWindowView.java
\frameworks\base\services\java\com\android\server\SystemServer.java
\frameworks\base\packages\SystemUI\src\com\android\systemui\SystemUIService.java
\frameworks\base\packages\SystemUI\src\com\android\systemui\SystemUIApplication.java
\frameworks\base\packages\SystemUI\src\com\android\systemui\SystemBars.java

SystemServer.java

\frameworks\base\services\java\com\android\server\SystemServer.java
在Zeyote进程启动中我们讲到，Zeyote启动后会去执行SystemServer，在SystemServer中启动了SystemUIService

static final void startSystemUi(Context context, WindowManagerService windowManager) {    Intent intent = new Intent();    intent.setComponent(new ComponentName("com.android.systemui",                "com.android.systemui.SystemUIService"));    intent.addFlags(Intent.FLAG_DEBUG_TRIAGED_MISSING);    //Slog.d(TAG, "Starting service: " + intent);    context.startServiceAsUser(intent, UserHandle.SYSTEM);    windowManager.onSystemUiStarted();}

SystemUIService.java

SystemUIService去初始化SystemUI的一系列组件。

@Overridepublic void onCreate() {    super.onCreate();    ((SystemUIApplication) getApplication()).startServicesIfNeeded();    //省略了一部分代码    //...}

SystemUIApplication.java

初始化config_systemUIServiceComponents中的组件：

public void startServicesIfNeeded() {    String[] names = getResources().getStringArray(R.array.config_systemUIServiceComponents);    startServicesIfNeeded(names);}

源码：\frameworks\base\packages\SystemUI\res\values\config.xml
config_systemUIServiceComponents的定义：

<!-- SystemUI Services: The classes of the stuff to start. --><string-array name="config_systemUIServiceComponents" translatable="false">    <item>com.android.systemui.Dependency</item>    <item>com.android.systemui.util.NotificationChannels</item>    <item>com.android.systemui.statusbar.CommandQueue$CommandQueueStart</item>    <item>com.android.systemui.keyguard.KeyguardViewMediator</item>    <item>com.android.systemui.recents.Recents</item>    <item>com.android.systemui.volume.VolumeUI</item>    <item>com.android.systemui.stackdivider.Divider</item>    <item>com.android.systemui.SystemBars</item>//启动状态栏和导航栏    <item>com.android.systemui.usb.StorageNotification</item>    <item>com.android.systemui.power.PowerUI</item>    <item>com.android.systemui.media.RingtonePlayer</item>    <item>com.android.systemui.keyboard.KeyboardUI</item>    <item>com.android.systemui.pip.PipUI</item>    <item>com.android.systemui.shortcut.ShortcutKeyDispatcher</item>    <item>@string/config_systemUIVendorServiceComponent</item>    <item>com.android.systemui.util.leak.GarbageMonitor$Service</item>    <item>com.android.systemui.LatencyTester</item>    <item>com.android.systemui.globalactions.GlobalActionsComponent</item>    <item>com.android.systemui.ScreenDecorations</item>    <item>com.android.systemui.fingerprint.FingerprintDialogImpl</item>    <item>com.android.systemui.SliceBroadcastRelayHandler</item></string-array>

这其中就包括SystemBars，SystemBar包括StatusBar和NavigationBar。

private void startServicesIfNeeded(String[] services) {    //省略了一部分代码    //...        log.traceBegin("StartServices");        final int N = services.length;        for (int i = 0; i < N; i++) {            String clsName = services[i];            if (DEBUG) Log.d(TAG, "loading: " + clsName);            log.traceBegin("StartServices" + clsName);            long ti = System.currentTimeMillis();            Class cls;            try {                cls = Class.forName(clsName);                mServices[i] = (SystemUI) cls.newInstance();            } catch(ClassNotFoundException ex){                throw new RuntimeException(ex);            } catch (IllegalAccessException ex) {                throw new RuntimeException(ex);            } catch (InstantiationException ex) {                throw new RuntimeException(ex);            }            mServices[i].mContext = this;            mServices[i].mComponents = mComponents;            if (DEBUG) Log.d(TAG, "running: " + mServices[i]);            mServices[i].start();            log.traceEnd();            // Warn if initialization of component takes too long            ti = System.currentTimeMillis() - ti;            if (ti > 1000) {                Log.w(TAG, "Initialization of " + cls.getName() + " took " + ti + " ms");            }            if (mBootCompleted) {                mServices[i].onBootCompleted();            }        }        log.traceEnd();    //省略了一部分代码    //...}

关键点：mServices[i].start();依次启动了config_systemUIServiceComponents中的每一个services.

关于状态栏和导航栏，我们主要SystemBar。

SystemBars.java

@Overridepublic void start() {    if (DEBUG) Log.d(TAG, "start");    createStatusBarFromConfig();}private void createStatusBarFromConfig() {    if (DEBUG) Log.d(TAG, "createStatusBarFromConfig");    final String clsName = mContext.getString(R.string.config_statusBarComponent);    if (clsName == null || clsName.length() == 0) {        throw andLog("No status bar component configured", null);    }    Class<?> cls = null;    try {        cls = mContext.getClassLoader().loadClass(clsName);    } catch (Throwable t) {        throw andLog("Error loading status bar component: " + clsName, t);    }    try {        mStatusBar = (SystemUI) cls.newInstance();    } catch (Throwable t) {        throw andLog("Error creating status bar component: " + clsName, t);    }    mStatusBar.mContext = mContext;    mStatusBar.mComponents = mComponents;    mStatusBar.start();    if (DEBUG) Log.d(TAG, "started " + mStatusBar.getClass().getSimpleName());}

根据config_statusBarComponent配置去决定加载那个StatusBar对象。
源码：\frameworks\base\packages\SystemUI\res\values\config.xml
config_statusBarComponent的定义：

<!-- Component to be used as the status bar service.  Must implement the IStatusBar interface.  This name is in the ComponentName flattened format (package/class)  --><string name="config_statusBarComponent" translatable="false">com.android.systemui.statusbar.phone.StatusBar</string>

所以，执行了StatusBar中的start()，来进行了一些系列的StatusBar加载。

StatusBar.java

1、加载super_status_bar.xml

protected StatusBarWindowView mStatusBarWindow;protected void inflateStatusBarWindow(Context context) {    mStatusBarWindow = (StatusBarWindowView) View.inflate(context,R.layout.super_status_bar, null);}

2、创建mStatusBarWindow
关键点：mStatusBarWindowManager.add(mStatusBarWindow, getStatusBarHeight());

private void addStatusBarWindow() {    makeStatusBarView();    mStatusBarWindowManager = Dependency.get(StatusBarWindowManager.class);    mRemoteInputManager.setUpWithPresenter(this, mEntryManager, this,            new RemoteInputController.Delegate() {                public void setRemoteInputActive(NotificationData.Entry entry,                        boolean remoteInputActive) {                    mHeadsUpManager.setRemoteInputActive(entry, remoteInputActive);                    entry.row.notifyHeightChanged(true /* needsAnimation */);                    updateFooter();                }                public void lockScrollTo(NotificationData.Entry entry) {                    mStackScroller.lockScrollTo(entry.row);                }                public void requestDisallowLongPressAndDismiss() {                    mStackScroller.requestDisallowLongPress();                    mStackScroller.requestDisallowDismiss();                }            });    mRemoteInputManager.getController().addCallback(mStatusBarWindowManager);    mStatusBarWindowManager.add(mStatusBarWindow, getStatusBarHeight());}

3、将状态栏视图添加到窗口管理器
StatusBarWindowManager.java中：

public void add(View statusBarView, int barHeight) {    // Now that the status bar window encompasses the sliding panel and its    // translucent backdrop, the entire thing is made TRANSLUCENT and is    // hardware-accelerated.    mLp = new WindowManager.LayoutParams(            ViewGroup.LayoutParams.MATCH_PARENT,            barHeight,            WindowManager.LayoutParams.TYPE_STATUS_BAR,            WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE                    | WindowManager.LayoutParams.FLAG_TOUCHABLE_WHEN_WAKING                    | WindowManager.LayoutParams.FLAG_SPLIT_TOUCH                    | WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH                    | WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS,            PixelFormat.TRANSLUCENT);    mLp.token = new Binder();    mLp.gravity = Gravity.TOP;    mLp.softInputMode = WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE;    mLp.setTitle("StatusBar");    mLp.packageName = mContext.getPackageName();    mLp.layoutInDisplayCutoutMode = LAYOUT_IN_DISPLAY_CUTOUT_MODE_ALWAYS;    mStatusBarView = statusBarView;    mBarHeight = barHeight;    mWindowManager.addView(mStatusBarView, mLp);    mLpChanged = new WindowManager.LayoutParams();    mLpChanged.copyFrom(mLp);}

SystemServer.java

SystemUIService.java

SystemUIApplication.java

SystemBars.java

StatusBar.java

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