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上一篇文章我们看到了车载状态栏 CarSystemBar 视图的创建流程，这里我们继续分析将车载状态栏添加到 Windows 窗口中。
一、添加状态栏到窗口
前面我们已经分析了构建视图对象容器和构建视图对象内容，接下来我们继续分析 attachNavBarWindows() 方法将视图对象添加到 Window 中。
1、CarSystemBar
源码位置：/packages/apps/Car/SystemUI/src/com/android/systemui/car/systembar/CarSystemBar.java
attachNavBarWindows
private final SystemBarConfigs mSystemBarConfigs;private void attachNavBarWindows() {mSystemBarConfigs.getSystemBarSidesByZOrder().forEach(this::attachNavBarBySide);
}attachNavBarWindows() 会调用 SystemBarConfigs 的 getSystemBarSidesByZOrder() 方法获取到当前存在的所有 SystemBar 所对应的 Side。
2、SystemBarConfigs
源码位置：/packages/apps/Car/SystemUI/src/com/android/systemui/car/systembar/SystemBarConfigs.java
private final List<@SystemBarSide Integer> mSystemBarSidesByZOrder = new ArrayList<>();protected List<Integer> getSystemBarSidesByZOrder() {return mSystemBarSidesByZOrder;
}可以看到这里返回一个 List<@SystemBarSide Integer> 类型的数组，下面看一下 mSystemBarSidesByZOrder 数据的赋值。
sortSystemBarSidesByZOrder
private final Map<@SystemBarSide Integer, SystemBarConfig> mSystemBarConfigMap = new ArrayMap<>();private void sortSystemBarSidesByZOrder() {// 获取SystemBarConfig列表List<SystemBarConfig> systemBarsByZOrder = new ArrayList<>(mSystemBarConfigMap.values());systemBarsByZOrder.sort(new Comparator<SystemBarConfig>() {@Overridepublic int compare(SystemBarConfig o1, SystemBarConfig o2) {// 进行大小比较return o1.getZOrder() - o2.getZOrder();}});// 存储排序后SystemBar的Side数值。systemBarsByZOrder.forEach(systemBarConfig -> {mSystemBarSidesByZOrder.add(systemBarConfig.getSide());});
}
这里首先对 SystemBarConfig 列表根据序号对 SystemBar 进行排序，并将排序后 SystemBar 的 Side 数值保存到 mSystemBarSidesByZOrder 数组中。而该函数是在 SystemBarConfigs 构造函数中进行调用，并且在调用之前还要填充 mSystemBarConfigMap 数据。
SystemBarConfigs
@Inject
public SystemBarConfigs(@Main Resources resources) {mResources = resources;// 初始化数据populateMaps();// 读取SystemBar所对应的SystemBarConfig的配置信息readConfigs();……// 使用SystemBarConfig的ZOrder属性对SystemBarConfig的Size进行排序sortSystemBarSidesByZOrder();
}
readConfigs
private void readConfigs() {mTopNavBarEnabled = mResources.getBoolean(R.bool.config_enableTopSystemBar);mBottomNavBarEnabled = mResources.getBoolean(R.bool.config_enableBottomSystemBar);mLeftNavBarEnabled = mResources.getBoolean(R.bool.config_enableLeftSystemBar);mRightNavBarEnabled = mResources.getBoolean(R.bool.config_enableRightSystemBar);// 顶部栏可用if (mTopNavBarEnabled) {SystemBarConfig topBarConfig =new SystemBarConfigBuilder().setSide(TOP)// 顶部栏高度.setGirth(mResources.getDimensionPixelSize(R.dimen.car_top_system_bar_height))// 系统栏类型.setBarType(mResources.getInteger(R.integer.config_topSystemBarType))// 系统栏Z轴序列.setZOrder(mResources.getInteger(R.integer.config_topSystemBarZOrder)).setHideForKeyboard(mResources.getBoolean(R.bool.config_hideTopSystemBarForKeyboard)).build();mSystemBarConfigMap.put(TOP, topBarConfig);}// 底部栏可用if (mBottomNavBarEnabled) {SystemBarConfig bottomBarConfig =new SystemBarConfigBuilder().setSide(BOTTOM).setGirth(mResources.getDimensionPixelSize(R.dimen.car_bottom_system_bar_height)).setBarType(mResources.getInteger(R.integer.config_bottomSystemBarType)).setZOrder(mResources.getInteger(R.integer.config_bottomSystemBarZOrder)).setHideForKeyboard(mResources.getBoolean(R.bool.config_hideBottomSystemBarForKeyboard)).build();mSystemBarConfigMap.put(BOTTOM, bottomBarConfig);}// 左侧栏不可用if (mLeftNavBarEnabled) {SystemBarConfig leftBarConfig =new SystemBarConfigBuilder().setSide(LEFT).setGirth(mResources.getDimensionPixelSize(R.dimen.car_left_system_bar_width)).setBarType(mResources.getInteger(R.integer.config_leftSystemBarType)).setZOrder(mResources.getInteger(R.integer.config_leftSystemBarZOrder)).setHideForKeyboard(mResources.getBoolean(R.bool.config_hideLeftSystemBarForKeyboard)).build();mSystemBarConfigMap.put(LEFT, leftBarConfig);}// 右侧栏不可用if (mRightNavBarEnabled) {SystemBarConfig rightBarConfig =new SystemBarConfigBuilder().setSide(RIGHT).setGirth(mResources.getDimensionPixelSize(R.dimen.car_right_system_bar_width)).setBarType(mResources.getInteger(R.integer.config_rightSystemBarType)).setZOrder(mResources.getInteger(R.integer.config_rightSystemBarZOrder)).setHideForKeyboard(mResources.getBoolean(R.bool.config_hideRightSystemBarForKeyboard)).build();mSystemBarConfigMap.put(RIGHT, rightBarConfig);}
}这里首先获取状态了的可用状态，从 config.xml 文件中获取对应数据。
<!-- 配置应该显示哪些系统条 -->
<bool name="config_enableTopSystemBar">true</bool>
<bool name="config_enableLeftSystemBar">false</bool>
<bool name="config_enableRightSystemBar">false</bool>
<bool name="config_enableBottomSystemBar">true</bool>可以看到，这里配置了状态栏的显示状态，所以修改进度条的显示位置可以通过修改该数据实现。 同样其他相关的配置信息也都可以在对应的配置文件中找到。
3、添加状态栏
我们知道 attachNavBarWindows() 方法最终会循环 mSystemBarSidesByZOrder 集合的内容，用该集合的子项作为参数，依次调用 attachNavBarBySide() 方法。
attachNavBarBySide
private void attachNavBarBySide(int side) {switch (side) {case SystemBarConfigs.TOP:// 如果顶部栏视图容器不为空，将顶部栏视图容器添加到Window中if (mTopSystemBarWindow != null) {mWindowManager.addView(mTopSystemBarWindow,mSystemBarConfigs.getLayoutParamsBySide(SystemBarConfigs.TOP));}break;case SystemBarConfigs.BOTTOM:if (mBottomSystemBarWindow != null && !mBottomNavBarVisible) {mBottomNavBarVisible = true;mWindowManager.addView(mBottomSystemBarWindow,mSystemBarConfigs.getLayoutParamsBySide(SystemBarConfigs.BOTTOM));}break;case SystemBarConfigs.LEFT:if (mLeftSystemBarWindow != null) {mWindowManager.addView(mLeftSystemBarWindow,mSystemBarConfigs.getLayoutParamsBySide(SystemBarConfigs.LEFT));}break;case SystemBarConfigs.RIGHT:if (mRightSystemBarWindow != null) {mWindowManager.addView(mRightSystemBarWindow,mSystemBarConfigs.getLayoutParamsBySide(SystemBarConfigs.RIGHT));}break;default:return;}
}该方法就是根据对应的 type 判断当前视图容器的具体类型，到底是顶部栏、底部栏、左侧栏还是右侧栏，根据类型配合类型相对应的参数将该视图容器添加到 WindowManager 中。
二、状态栏配置
状态栏配置类 SystemBarConfig 为 SystemBarConfigs 的内部类。
1、SystemBarConfig
// 系统条将开始出现在HUN的顶部的z轴顺序
private static final int HUN_ZORDER = 10;private static final int[] BAR_TYPE_MAP = {InsetsState.ITYPE_STATUS_BAR, // 状态栏对应的系统装饰窗口类型InsetsState.ITYPE_NAVIGATION_BAR, // 导航栏对应的系统装饰窗口类型InsetsState.ITYPE_CLIMATE_BAR, // 左侧栏对应的系统装饰窗口类型InsetsState.ITYPE_EXTRA_NAVIGATION_BAR // 右侧栏对应的系统装饰窗口类型private static final class SystemBarConfig {private final int mSide;private final int mBarType;private final int mGirth;private final int mZOrder;private final boolean mHideForKeyboard;private int[] mPaddings = new int[]{0, 0, 0, 0};private SystemBarConfig(@SystemBarSide int side, int barType, int girth, int zOrder,boolean hideForKeyboard) {mSide = side;mBarType = barType;mGirth = girth;mZOrder = zOrder;mHideForKeyboard = hideForKeyboard;}private int getSide() {return mSide;}private int getBarType() {return mBarType;}private int getGirth() {return mGirth;}private int getZOrder() {return mZOrder;}private boolean getHideForKeyboard() {return mHideForKeyboard;}private int[] getPaddings() {return mPaddings;}private WindowManager.LayoutParams getLayoutParams() {WindowManager.LayoutParams lp = new WindowManager.LayoutParams(isHorizontalBar(mSide) ? ViewGroup.LayoutParams.MATCH_PARENT : mGirth,isHorizontalBar(mSide) ? mGirth : ViewGroup.LayoutParams.MATCH_PARENT,mapZOrderToBarType(mZOrder),WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE| WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL| WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH| WindowManager.LayoutParams.FLAG_SPLIT_TOUCH,PixelFormat.TRANSLUCENT); // 设置窗口半透明（全透明：TRANSPARENT）lp.setTitle(BAR_TITLE_MAP.get(mSide));//顶部栏为new int[]{InsetsState.ITYPE_STATUS_BAR, InsetsState.ITYPE_TOP_MANDATORY_GESTURES}//底部栏为new int[]{InsetsState.ITYPE_NAVIGATION_BAR, InsetsState.ITYPE_BOTTOM_MANDATORY_GESTURES}//providesInsetsTypes这个字段很重要，只有设置对这个字段，系统才会认定该窗口是对应的装饰窗口lp.providesInsetsTypes = new int[]{BAR_TYPE_MAP[mBarType], BAR_GESTURE_MAP.get(mSide)};lp.setFitInsetsTypes(0);lp.windowAnimations = 0;lp.gravity = BAR_GRAVITY_MAP.get(mSide);return lp;}private int mapZOrderToBarType(int zOrder) {// 顶部栏窗口类型为TYPE_STATUS_BAR_ADDITIONAL，底部栏TYPE_NAVIGATION_BAR_PANELreturn zOrder >= HUN_ZORDER ? WindowManager.LayoutParams.TYPE_NAVIGATION_BAR_PANEL: WindowManager.LayoutParams.TYPE_STATUS_BAR_ADDITIONAL;}private void setPaddingBySide(@SystemBarSide int side, int padding) {mPaddings[side] = padding;}
}这里主要用来配置状态栏类型及对应的视图内容，其中状态栏位置和标题等信息是在上面的 populateMaps() 方法中赋值。
populateMaps
public static final int TOP = 0;
public static final int BOTTOM = 1;
public static final int LEFT = 2;
public static final int RIGHT = 3;private static void populateMaps() {// 将系统栏位置与Gravity值关联BAR_GRAVITY_MAP.put(TOP, Gravity.TOP);BAR_GRAVITY_MAP.put(BOTTOM, Gravity.BOTTOM);BAR_GRAVITY_MAP.put(LEFT, Gravity.LEFT);BAR_GRAVITY_MAP.put(RIGHT, Gravity.RIGHT);// 将系统栏位置与标题字符串关联BAR_TITLE_MAP.put(TOP, "TopCarSystemBar");BAR_TITLE_MAP.put(BOTTOM, "BottomCarSystemBar");BAR_TITLE_MAP.put(LEFT, "LeftCarSystemBar");BAR_TITLE_MAP.put(RIGHT, "RightCarSystemBar");// 将系统栏位置与手势类型关联BAR_GESTURE_MAP.put(TOP, InsetsState.ITYPE_TOP_MANDATORY_GESTURES);BAR_GESTURE_MAP.put(BOTTOM, InsetsState.ITYPE_BOTTOM_MANDATORY_GESTURES);BAR_GESTURE_MAP.put(LEFT, InsetsState.ITYPE_LEFT_MANDATORY_GESTURES);BAR_GESTURE_MAP.put(RIGHT, InsetsState.ITYPE_RIGHT_MANDATORY_GESTURES);
}2、SystemBarConfigBuilder
private static final class SystemBarConfigBuilder {private int mSide;private int mBarType;private int mGirth;private int mZOrder;private boolean mHideForKeyboard;private SystemBarConfigBuilder setSide(@SystemBarSide int side) {mSide = side;return this;}private SystemBarConfigBuilder setBarType(int type) {mBarType = type;return this;}private SystemBarConfigBuilder setGirth(int girth) {mGirth = girth;return this;}private SystemBarConfigBuilder setZOrder(int zOrder) {mZOrder = zOrder;return this;}private SystemBarConfigBuilder setHideForKeyboard(boolean hide) {mHideForKeyboard = hide;return this;}private SystemBarConfig build() {return new SystemBarConfig(mSide, mBarType, mGirth, mZOrder, mHideForKeyboard);}
}
SystemBarConfigBuilder 同样是 SystemBarConfigs 的内部类，它实现了构建者模式（Builder Pattern），用于简化 SystemBarConfig 对象的创建。