Android14---SystemUI分析（代码、图文详细讲解）
A ---------->SystemUI布局分析
SystemUI 是 Android 操作系统中的一个系统应用程序，它提供了系统用户界面的核心部分，包括状态栏、通知栏、快速设置面板、锁屏界面等（导航栏）。
状态栏通常位于屏幕顶部，显示时间、电池电量、信号强度、Wi-Fi 连接状态等信息。
通知栏是状态栏的一部分，可以下拉以显示更多的应用通知和快速设置选项。
快速设置面板通常通过下拉通知栏来访问，它提供了一系列的快捷开关和设置选项，允许用户快速调整设备的设置，如Wi-Fi、蓝牙、飞行模式、亮度调节、声音设置等。该面板的设计旨在提供快速访问常用设置，而无需打开完整的设置应用。
锁屏页面是设备在一段时间不活动后进入的一种状态，它显示时间和日期，并可能显示未读通知的摘要。
1、锁屏页面
status_bar_expanded.xml
<com.android.systemui.shade.NotificationPanelViewxmlns:android="http://schemas.android.com/apk/res/android"xmlns:systemui="http://schemas.android.com/apk/res-auto"android:id="@+id/notification_panel"android:layout_width="match_parent"android:layout_height="match_parent"android:background="@android:color/transparent"><com.android.systemui.common.ui.view.LongPressHandlingViewandroid:id="@+id/keyguard_long_press"android:layout_width="match_parent"android:layout_height="match_parent"/><ViewStubandroid:id="@+id/keyguard_qs_user_switch_stub"android:layout="@layout/keyguard_qs_user_switch"android:layout_height="match_parent"android:layout_width="match_parent"/><includelayout="@layout/status_bar_expanded_plugin_frame"/><com.android.systemui.shade.NotificationsQuickSettingsContainerandroid:layout_width="match_parent"android:layout_height="match_parent"android:layout_gravity="@integer/notification_panel_layout_gravity"android:id="@+id/notification_container_parent"android:clipToPadding="false"android:clipChildren="false"><includelayout="@layout/keyguard_status_view"android:visibility="gone"/><includelayout="@layout/dock_info_overlay"/><FrameLayoutandroid:id="@+id/qs_frame"android:layout="@layout/qs_panel"android:layout_width="0dp"android:layout_height="0dp"android:clipToPadding="false"android:clipChildren="false"android:layout_marginHorizontal="@dimen/notification_panel_margin_horizontal"systemui:viewType="com.android.systemui.plugins.qs.QS"systemui:layout_constraintStart_toStartOf="parent"systemui:layout_constraintEnd_toEndOf="parent"systemui:layout_constraintTop_toTopOf="parent"systemui:layout_constraintBottom_toBottomOf="parent"/><!-- This view should be after qs_frame so touches are dispatched first to it. That gives
it a chance to capture clicks before the NonInterceptingScrollView disallows all
intercepts --><ViewStubandroid:id="@+id/qs_header_stub"android:layout_height="wrap_content"android:layout_width="match_parent"/><androidx.constraintlayout.widget.Guidelineandroid:id="@+id/qs_edge_guideline"android:layout_width="wrap_content"android:layout_height="wrap_content"systemui:layout_constraintGuide_percent="0.5"android:orientation="vertical"/><!-- This layout should always include a version of
NotificationStackScrollLayout, as it is expected from
NotificationPanelViewController. --><includelayout="@layout/notification_stack_scroll_layout"/><includelayout="@layout/photo_preview_overlay"/><includelayout="@layout/keyguard_status_bar"android:visibility="invisible"/><Buttonandroid:id="@+id/report_rejected_touch"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginTop="@dimen/status_bar_header_height_keyguard"android:text="@string/report_rejected_touch"android:visibility="gone"/><com.android.systemui.statusbar.phone.TapAgainViewandroid:id="@+id/shade_falsing_tap_again"android:layout_width="wrap_content"android:layout_height="wrap_content"systemui:layout_constraintLeft_toLeftOf="parent"systemui:layout_constraintRight_toRightOf="parent"systemui:layout_constraintBottom_toBottomOf="parent"android:layout_marginBottom="20dp"android:paddingHorizontal="16dp"android:minHeight="44dp"android:elevation="4dp"android:background="@drawable/rounded_bg_full"android:gravity="center"android:text="@string/m_tap_again"android:visibility="gone"/></com.android.systemui.shade.NotificationsQuickSettingsContainer><ViewStubandroid:id="@+id/keyguard_user_switcher_stub"android:layout="@layout/keyguard_user_switcher"android:layout_height="match_parent"android:layout_width="match_parent"/><includelayout="@layout/dock_info_bottom_area_overlay"/><com.android.keyguard.LockIconViewandroid:id="@+id/lock_icon_view"android:layout_width="wrap_content"android:layout_height="wrap_content"><!-- Background protection --><ImageViewandroid:id="@+id/lock_icon_bg"android:layout_width="match_parent"android:layout_height="match_parent"android:src="@drawable/fingerprint_bg"android:visibility="invisible"/><ImageViewandroid:id="@+id/lock_icon"android:layout_width="match_parent"android:layout_height="match_parent"android:layout_gravity="center"android:scaleType="centerCrop"/></com.android.keyguard.LockIconView><includelayout="@layout/keyguard_bottom_area"android:visibility="gone"/></com.android.systemui.shade.NotificationPanelView>
keyguard_status_bar.xml
<!-- Extends RelativeLayout --><com.android.systemui.statusbar.phone.KeyguardStatusBarViewxmlns:android="http://schemas.android.com/apk/res/android"xmlns:systemui="http://schemas.android.com/apk/res-auto"android:id="@+id/keyguard_header"android:layout_width="match_parent"android:layout_height="@dimen/status_bar_header_height_keyguard"android:baselineAligned="false"android:gravity="center_vertical"><LinearLayoutandroid:id="@+id/status_icon_area"android:layout_width="wrap_content"android:layout_height="match_parent"android:layout_marginStart="@dimen/system_icons_super_container_margin_start"android:paddingTop="@dimen/status_bar_padding_top"android:layout_alignParentEnd="true"android:gravity="center_vertical|end"><includeandroid:id="@+id/user_switcher_container"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginEnd="@dimen/status_bar_user_chip_end_margin"layout="@layout/status_bar_user_chip_container"/><FrameLayoutandroid:id="@+id/system_icons_container"android:layout_width="wrap_content"android:layout_height="match_parent"android:layout_marginEnd="@dimen/status_bar_padding_end"android:gravity="center_vertical|end"><includelayout="@layout/system_icons"/></FrameLayout><ImageViewandroid:id="@+id/multi_user_avatar"android:layout_width="@dimen/multi_user_avatar_keyguard_size"android:layout_height="@dimen/multi_user_avatar_keyguard_size"android:layout_gravity="center"android:scaleType="centerInside"/></LinearLayout><Spaceandroid:id="@+id/cutout_space_view"android:layout_width="0dp"android:layout_height="match_parent"android:gravity="center"android:visibility="gone"/><com.android.keyguard.CarrierTextandroid:id="@+id/keyguard_carrier_text"android:layout_width="match_parent"android:layout_height="match_parent"android:paddingTop="@dimen/status_bar_padding_top"android:layout_marginStart="@dimen/keyguard_carrier_text_margin"android:layout_toStartOf="@id/system_icons_container"android:gravity="center_vertical"android:ellipsize="marquee"android:textDirection="locale"android:textAppearance="@style/TextAppearance.StatusBar.Clock"android:textColor="?attr/wallpaperTextColorSecondary"android:singleLine="true"systemui:showMissingSim="true"systemui:showAirplaneMode="true"systemui:debugLocation="Keyguard"/></com.android.systemui.statusbar.phone.KeyguardStatusBarView>
keyguard_pattern_view.xml
<!-- This is the screen that shows the 9 circle unlock widget and instructs
the user how to unlock their device, or make an emergency call. This
is the portrait layout. --><com.android.keyguard.KeyguardPatternViewxmlns:android="http://schemas.android.com/apk/res/android"xmlns:androidprv="http://schemas.android.com/apk/res-auto"android:id="@+id/keyguard_pattern_view"android:orientation="vertical"android:layout_width="match_parent"android:layout_height="match_parent"androidprv:layout_maxWidth="@dimen/biometric_auth_pattern_view_max_size"android:layout_gravity="center_horizontal|bottom"android:clipChildren="false"android:clipToPadding="false"><includelayout="@layout/keyguard_bouncer_message_area"/><com.android.systemui.keyguard.bouncer.ui.BouncerMessageViewandroid:id="@+id/bouncer_message_view"android:layout_width="match_parent"android:layout_height="wrap_content"android:orientation="vertical"/><androidx.constraintlayout.widget.ConstraintLayoutandroid:id="@+id/pattern_container"android:layout_width="match_parent"android:layout_height="0dp"android:layout_marginBottom="8dp"android:layout_weight="1"android:layoutDirection="ltr"><androidx.constraintlayout.widget.Guidelineandroid:id="@+id/pattern_top_guideline"android:layout_width="wrap_content"android:layout_height="wrap_content"androidprv:layout_constraintGuide_percent="0"android:orientation="horizontal"/><com.android.internal.widget.LockPatternViewandroid:id="@+id/lockPatternView"android:layout_width="0dp"android:layout_height="0dp"androidprv:layout_constraintTop_toBottomOf="@id/pattern_top_guideline"androidprv:layout_constraintBottom_toBottomOf="parent"androidprv:layout_constraintLeft_toLeftOf="parent"androidprv:layout_constraintRight_toRightOf="parent"androidprv:layout_constraintDimensionRatio="1.0"androidprv:layout_constraintVertical_bias="1.0"/></androidx.constraintlayout.widget.ConstraintLayout><includelayout="@layout/keyguard_eca"android:id="@+id/keyguard_selector_fade_container"android:layout_width="match_parent"android:layout_height="wrap_content"android:orientation="vertical"android:layout_gravity="bottom|center_horizontal"android:layout_marginTop="@dimen/keyguard_eca_top_margin"android:layout_marginBottom="@dimen/keyguard_eca_bottom_margin"android:gravity="center_horizontal"/></com.android.keyguard.KeyguardPatternView>
2、QSB and 通知区域
status_bar_expanded.xml
<com.android.systemui.shade.NotificationPanelViewxmlns:android="http://schemas.android.com/apk/res/android"xmlns:systemui="http://schemas.android.com/apk/res-auto"android:id="@+id/notification_panel"android:layout_width="match_parent"android:layout_height="match_parent"android:background="@android:color/transparent"><com.android.systemui.common.ui.view.LongPressHandlingViewandroid:id="@+id/keyguard_long_press"android:layout_width="match_parent"android:layout_height="match_parent"/><ViewStubandroid:id="@+id/keyguard_qs_user_switch_stub"android:layout="@layout/keyguard_qs_user_switch"android:layout_height="match_parent"android:layout_width="match_parent"/><includelayout="@layout/status_bar_expanded_plugin_frame"/><com.android.systemui.shade.NotificationsQuickSettingsContainerandroid:layout_width="match_parent"android:layout_height="match_parent"android:layout_gravity="@integer/notification_panel_layout_gravity"android:id="@+id/notification_container_parent"android:clipToPadding="false"android:clipChildren="false"><includelayout="@layout/keyguard_status_view"android:visibility="gone"/><includelayout="@layout/dock_info_overlay"/><FrameLayoutandroid:id="@+id/qs_frame"android:layout="@layout/qs_panel"android:layout_width="0dp"android:layout_height="0dp"android:clipToPadding="false"android:clipChildren="false"android:layout_marginHorizontal="@dimen/notification_panel_margin_horizontal"systemui:viewType="com.android.systemui.plugins.qs.QS"systemui:layout_constraintStart_toStartOf="parent"systemui:layout_constraintEnd_toEndOf="parent"systemui:layout_constraintTop_toTopOf="parent"systemui:layout_constraintBottom_toBottomOf="parent"/><!-- This view should be after qs_frame so touches are dispatched first to it. That gives
it a chance to capture clicks before the NonInterceptingScrollView disallows all
intercepts --><ViewStubandroid:id="@+id/qs_header_stub"android:layout_height="wrap_content"android:layout_width="match_parent"/><androidx.constraintlayout.widget.Guidelineandroid:id="@+id/qs_edge_guideline"android:layout_width="wrap_content"android:layout_height="wrap_content"systemui:layout_constraintGuide_percent="0.5"android:orientation="vertical"/><!-- This layout should always include a version of
NotificationStackScrollLayout, as it is expected from
NotificationPanelViewController. --><includelayout="@layout/notification_stack_scroll_layout"/><includelayout="@layout/photo_preview_overlay"/><includelayout="@layout/keyguard_status_bar"android:visibility="invisible"/><Buttonandroid:id="@+id/report_rejected_touch"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginTop="@dimen/status_bar_header_height_keyguard"android:text="@string/report_rejected_touch"android:visibility="gone"/><com.android.systemui.statusbar.phone.TapAgainViewandroid:id="@+id/shade_falsing_tap_again"android:layout_width="wrap_content"android:layout_height="wrap_content"systemui:layout_constraintLeft_toLeftOf="parent"systemui:layout_constraintRight_toRightOf="parent"systemui:layout_constraintBottom_toBottomOf="parent"android:layout_marginBottom="20dp"android:paddingHorizontal="16dp"android:minHeight="44dp"android:elevation="4dp"android:background="@drawable/rounded_bg_full"android:gravity="center"android:text="@string/m_tap_again"android:visibility="gone"/><!-- luzongrui change for Tap again bug 73547 20240424--></com.android.systemui.shade.NotificationsQuickSettingsContainer><ViewStubandroid:id="@+id/keyguard_user_switcher_stub"android:layout="@layout/keyguard_user_switcher"android:layout_height="match_parent"android:layout_width="match_parent"/><includelayout="@layout/dock_info_bottom_area_overlay"/><com.android.keyguard.LockIconViewandroid:id="@+id/lock_icon_view"android:layout_width="wrap_content"android:layout_height="wrap_content"><!-- Background protection --><ImageViewandroid:id="@+id/lock_icon_bg"android:layout_width="match_parent"android:layout_height="match_parent"android:src="@drawable/fingerprint_bg"android:visibility="invisible"/><ImageViewandroid:id="@+id/lock_icon"android:layout_width="match_parent"android:layout_height="match_parent"android:layout_gravity="center"android:scaleType="centerCrop"/></com.android.keyguard.LockIconView><includelayout="@layout/keyguard_bottom_area"android:visibility="gone"/></com.android.systemui.shade.NotificationPanelView>
qs_panel.xml
<com.android.systemui.qs.QSContainerImplxmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:id="@+id/quick_settings_container"android:layout_width="match_parent"android:layout_height="match_parent"android:clipToPadding="false"android:clipChildren="false"><com.android.systemui.qs.NonInterceptingScrollViewandroid:id="@+id/expanded_qs_scroll_view"android:layout_width="match_parent"android:layout_height="wrap_content"android:elevation="@dimen/qs_panel_elevation"android:importantForAccessibility="no"android:scrollbars="none"android:clipChildren="false"android:clipToPadding="false"android:layout_weight="1"><com.android.systemui.qs.QSPanelandroid:id="@+id/quick_settings_panel"android:layout_width="match_parent"android:layout_height="wrap_content"android:background="@android:color/transparent"android:focusable="true"android:accessibilityTraversalBefore="@android:id/edit"android:clipToPadding="false"android:clipChildren="false"><includelayout="@layout/qs_footer_impl"/></com.android.systemui.qs.QSPanel></com.android.systemui.qs.NonInterceptingScrollView><includelayout="@layout/quick_status_bar_expanded_header"/><includelayout="@layout/footer_actions"android:id="@+id/qs_footer_actions"android:layout_height="@dimen/footer_actions_height"android:layout_width="match_parent"android:layout_gravity="bottom"/><includeandroid:id="@+id/qs_customize"layout="@layout/qs_customize_panel"android:visibility="gone"/></com.android.systemui.qs.QSContainerImpl>
qs_footer_impl.xml
<!-- Extends FrameLayout --><com.android.systemui.qs.QSFooterViewxmlns:android="http://schemas.android.com/apk/res/android"android:id="@+id/qs_footer"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_marginStart="@dimen/qs_footer_margin"android:layout_marginEnd="@dimen/qs_footer_margin"android:layout_marginBottom="@dimen/qs_footers_margin_bottom"android:background="@android:color/transparent"android:baselineAligned="false"android:clickable="false"android:clipChildren="false"android:clipToPadding="false"><LinearLayoutandroid:layout_width="match_parent"android:layout_height="@dimen/qs_footer_height"android:layout_gravity="center_vertical"><TextViewandroid:id="@+id/build"android:layout_width="0dp"android:layout_height="match_parent"android:paddingEnd="4dp"android:layout_weight="1"android:clickable="true"android:ellipsize="marquee"android:focusable="true"android:gravity="center_vertical"android:singleLine="true"android:textAppearance="@style/TextAppearance.QS.Status.Build"android:visibility="gone"/><com.android.systemui.qs.PageIndicatorandroid:id="@+id/footer_page_indicator"android:layout_width="wrap_content"android:layout_height="match_parent"android:layout_gravity="center_vertical"android:visibility="gone"/><FrameLayoutandroid:layout_width="0dp"android:layout_height="match_parent"android:layout_weight="1"><com.android.systemui.statusbar.AlphaOptimizedImageViewandroid:id="@android:id/edit"android:layout_width="@dimen/qs_footer_action_button_size"android:layout_height="@dimen/qs_footer_action_button_size"android:layout_gravity="center_vertical|end"android:background="@drawable/qs_footer_edit_circle"android:clickable="true"android:contentDescription="@string/accessibility_quick_settings_edit"android:focusable="true"android:padding="@dimen/qs_footer_icon_padding"android:src="@*android:drawable/ic_mode_edit"android:tint="?android:attr/textColorPrimary"/></FrameLayout></LinearLayout></com.android.systemui.qs.QSFooterView>
3、QSB状态栏
combined_qs_header.xml
<!--
keep split_shade_status_bar height constant to avoid requestLayout calls on each
frame when animating QS <-> QQS transition
--><com.android.systemui.util.NoRemeasureMotionLayoutxmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"android:id="@+id/split_shade_status_bar"android:layout_width="match_parent"android:layout_height="@dimen/qs_header_height"android:minHeight="@dimen/large_screen_shade_header_min_height"android:clickable="false"android:focusable="true"android:paddingLeft="@dimen/qs_panel_padding"android:paddingRight="@dimen/qs_panel_padding"android:visibility="gone"android:theme="@style/Theme.SystemUI.QuickSettings.Header"app:layoutDescription="@xml/combined_qs_header_scene"><androidx.constraintlayout.widget.Guidelineandroid:id="@+id/qqs_header_bottom_guideline"android:layout_width="wrap_content"android:layout_height="wrap_content"android:orientation="horizontal"app:layout_constraintGuide_begin="@dimen/large_screen_shade_header_min_height"/><androidx.constraintlayout.widget.Guidelineandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:id="@+id/begin_guide"android:orientation="vertical"app:layout_constraintGuide_begin="0dp"/><androidx.constraintlayout.widget.Guidelineandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:id="@+id/end_guide"android:orientation="vertical"app:layout_constraintGuide_end="0dp"/><androidx.constraintlayout.widget.Guidelineandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:id="@+id/center_left"android:orientation="vertical"/><androidx.constraintlayout.widget.Guidelineandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:id="@+id/center_right"android:orientation="vertical"/><androidx.constraintlayout.widget.Barrierandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:id="@+id/barrier"app:barrierDirection="start"app:constraint_referenced_ids="statusIcons,privacy_container"/><com.android.systemui.statusbar.policy.Clockandroid:id="@+id/clock"android:layout_width="wrap_content"android:layout_height="0dp"android:gravity="start|center_vertical"android:paddingStart="@dimen/status_bar_left_clock_starting_padding"android:paddingEnd="@dimen/status_bar_left_clock_end_padding"android:singleLine="true"android:textDirection="locale"android:textAppearance="@style/TextAppearance.QS.Status"android:transformPivotX="0dp"android:transformPivotY="24dp"android:scaleX="1"android:scaleY="1"/><com.android.systemui.statusbar.policy.VariableDateViewandroid:id="@+id/date"android:layout_width="wrap_content"android:layout_height="0dp"android:layout_gravity="start|center_vertical"android:gravity="center_vertical"android:singleLine="true"android:textDirection="locale"android:textAppearance="@style/TextAppearance.QS.Status"app:longDatePattern="@string/abbrev_wday_month_day_no_year_alarm"app:shortDatePattern="@string/abbrev_month_day_no_year"/><includeandroid:id="@+id/carrier_group"layout="@layout/shade_carrier_group"app:layout_constraintHeight_min="@dimen/large_screen_shade_header_min_height"android:minHeight="@dimen/large_screen_shade_header_min_height"app:layout_constraintWidth_min="48dp"android:layout_width="0dp"android:layout_height="0dp"app:layout_constrainedWidth="true"android:layout_gravity="end|center_vertical"android:layout_marginStart="8dp"app:layout_constraintStart_toEndOf="@id/date"app:layout_constraintEnd_toStartOf="@id/statusIcons"app:layout_constraintTop_toTopOf="@id/clock"app:layout_constraintBottom_toBottomOf="parent"app:layout_constraintHorizontal_bias="1"/><com.android.systemui.statusbar.phone.StatusIconContainerandroid:id="@+id/statusIcons"app:layout_constraintHeight_min="@dimen/large_screen_shade_header_min_height"android:paddingEnd="@dimen/signal_cluster_battery_padding"android:layout_width="wrap_content"android:layout_height="@dimen/large_screen_shade_header_min_height"app:layout_constraintStart_toEndOf="@id/carrier_group"app:layout_constraintEnd_toStartOf="@id/batteryRemainingIcon"app:layout_constraintTop_toTopOf="@id/clock"app:layout_constraintBottom_toBottomOf="parent"app:layout_constraintHorizontal_bias="1"/><com.android.systemui.battery.BatteryMeterViewandroid:id="@+id/batteryRemainingIcon"android:layout_width="wrap_content"android:layout_height="@dimen/large_screen_shade_header_min_height"app:layout_constraintHeight_min="@dimen/large_screen_shade_header_min_height"app:layout_constrainedWidth="true"app:textAppearance="@style/TextAppearance.QS.Status"app:layout_constraintStart_toEndOf="@id/statusIcons"app:layout_constraintEnd_toEndOf="parent"app:layout_constraintTop_toTopOf="@id/clock"app:layout_constraintBottom_toBottomOf="parent"/><FrameLayoutandroid:id="@+id/privacy_container"android:layout_width="wrap_content"android:layout_height="@dimen/large_screen_shade_header_min_height"android:gravity="center"app:layout_constraintBottom_toBottomOf="@id/date"app:layout_constraintEnd_toEndOf="@id/end_guide"app:layout_constraintTop_toTopOf="@id/date"><com.android.systemui.privacy.OngoingPrivacyChipandroid:layout_width="wrap_content"android:layout_height="match_parent"/></FrameLayout></com.android.systemui.util.NoRemeasureMotionLayout>
4、桌面状态栏
status_bar.xml
<!-- android:background="@drawable/status_bar_closed_default_background" --><com.android.systemui.statusbar.phone.PhoneStatusBarViewxmlns:android="http://schemas.android.com/apk/res/android"xmlns:systemui="http://schemas.android.com/apk/res/com.android.systemui"android:layout_width="match_parent"android:layout_height="@dimen/status_bar_height"android:id="@+id/status_bar"android:orientation="vertical"android:focusable="false"android:descendantFocusability="afterDescendants"android:accessibilityPaneTitle="@string/status_bar"><ImageViewandroid:id="@+id/notification_lights_out"android:layout_width="@dimen/status_bar_icon_size"android:layout_height="match_parent"android:paddingStart="@dimen/status_bar_padding_start"android:paddingBottom="2dip"android:src="@drawable/ic_sysbar_lights_out_dot_small"android:scaleType="center"android:visibility="gone"/><LinearLayoutandroid:id="@+id/status_bar_contents"android:layout_width="match_parent"android:layout_height="match_parent"android:clipChildren="false"android:clipToPadding="false"android:paddingStart="@dimen/status_bar_padding_start"android:paddingEnd="@dimen/status_bar_padding_end"android:paddingTop="@dimen/status_bar_padding_top"android:orientation="horizontal"><!-- Container for the entire start half of the status bar. It will always use the same
width, independent of the number of visible children and sub-children. --><FrameLayoutandroid:id="@+id/status_bar_start_side_container"android:layout_height="match_parent"android:layout_width="0dp"android:clipChildren="false"android:layout_weight="1"><!-- Container that is wrapped around the views on the start half of the status bar.
Its width will change with the number of visible children and sub-children.
It is useful when we want to know the visible bounds of the content. --><FrameLayoutandroid:id="@+id/status_bar_start_side_content"android:layout_width="wrap_content"android:layout_height="wrap_content"android:clipChildren="false"><includelayout="@layout/heads_up_status_bar_layout"/><!-- The alpha of the start side is controlled by PhoneStatusBarTransitions, and the
individual views are controlled by StatusBarManager disable flags DISABLE_CLOCK
and DISABLE_NOTIFICATION_ICONS, respectively --><LinearLayoutandroid:id="@+id/status_bar_start_side_except_heads_up"android:layout_height="wrap_content"android:layout_width="match_parent"android:clipChildren="false"><ViewStubandroid:id="@+id/operator_name"android:layout_width="wrap_content"android:layout_height="match_parent"android:layout="@layout/operator_name"/><com.android.systemui.statusbar.policy.Clockandroid:id="@+id/clock"android:layout_width="wrap_content"android:layout_height="match_parent"android:textAppearance="@style/TextAppearance.StatusBar.Clock"android:singleLine="true"android:paddingStart="@dimen/status_bar_left_clock_starting_padding"android:paddingEnd="@dimen/status_bar_left_clock_end_padding"android:gravity="center_vertical|start"/><includelayout="@layout/ongoing_call_chip"/><com.android.systemui.statusbar.AlphaOptimizedFrameLayoutandroid:id="@+id/notification_icon_area"android:layout_width="wrap_content"android:layout_height="match_parent"android:orientation="horizontal"android:clipChildren="false"/></LinearLayout></FrameLayout></FrameLayout><!-- Space should cover the notch (if it exists) and let other views lay out around it --><android.widget.Spaceandroid:id="@+id/cutout_space_view"android:layout_width="0dp"android:layout_height="match_parent"android:gravity="center_horizontal|center_vertical"/><!-- Container for the entire end half of the status bar. It will always use the same
width, independent of the number of visible children and sub-children. --><FrameLayoutandroid:id="@+id/status_bar_end_side_container"android:layout_width="0dp"android:layout_height="match_parent"android:layout_weight="1"android:clipChildren="false"><!-- Container that is wrapped around the views on the end half of the
status bar. Its width will change with the number of visible children and
sub-children.
It is useful when we want know the visible bounds of the content.--><com.android.keyguard.AlphaOptimizedLinearLayoutandroid:id="@+id/status_bar_end_side_content"android:layout_width="wrap_content"android:layout_height="match_parent"android:layout_gravity="end"android:orientation="horizontal"android:gravity="center_vertical|end"android:clipChildren="false"><includeandroid:id="@+id/user_switcher_container"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginEnd="@dimen/status_bar_user_chip_end_margin"layout="@layout/status_bar_user_chip_container"/><includelayout="@layout/system_icons"/></com.android.keyguard.AlphaOptimizedLinearLayout></FrameLayout></LinearLayout></com.android.systemui.statusbar.phone.PhoneStatusBarView>
5、QSB编辑页面
status_bar_expanded.xml
qs_panel.xml
<com.android.systemui.qs.QSContainerImplxmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:id="@+id/quick_settings_container"android:layout_width="match_parent"android:layout_height="match_parent"android:clipToPadding="false"android:clipChildren="false"><com.android.systemui.qs.NonInterceptingScrollViewandroid:id="@+id/expanded_qs_scroll_view"android:layout_width="match_parent"android:layout_height="wrap_content"android:elevation="@dimen/qs_panel_elevation"android:importantForAccessibility="no"android:scrollbars="none"android:clipChildren="false"android:clipToPadding="false"android:layout_weight="1"><com.android.systemui.qs.QSPanelandroid:id="@+id/quick_settings_panel"android:layout_width="match_parent"android:layout_height="wrap_content"android:background="@android:color/transparent"android:focusable="true"android:accessibilityTraversalBefore="@android:id/edit"android:clipToPadding="false"android:clipChildren="false"><includelayout="@layout/qs_footer_impl"/></com.android.systemui.qs.QSPanel></com.android.systemui.qs.NonInterceptingScrollView><includelayout="@layout/quick_status_bar_expanded_header"/><includelayout="@layout/footer_actions"android:id="@+id/qs_footer_actions"android:layout_height="@dimen/footer_actions_height"android:layout_width="match_parent"android:layout_gravity="bottom"/><includeandroid:id="@+id/qs_customize"layout="@layout/qs_customize_panel"android:visibility="gone"/></com.android.systemui.qs.QSContainerImpl>
qs_customize_panel.xml
<!-- Height is 0 because it will be managed by the QS manually --><com.android.systemui.qs.customize.QSCustomizerxmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="0dp"android:elevation="4dp"android:orientation="vertical"android:gravity="center_horizontal"></com.android.systemui.qs.customize.QSCustomizer>
QSCustomizer.java
publicQSCustomizer(Context context,AttributeSet attrs){super(context, attrs);LayoutInflater.from(getContext()).inflate(R.layout.qs_customize_panel_content,this);
mClipper =newQSDetailClipper(findViewById(R.id.customize_container));Toolbar toolbar =findViewById(com.android.internal.R.id.action_bar);TypedValue value =newTypedValue();
mContext.getTheme().resolveAttribute(android.R.attr.homeAsUpIndicator, value,true);
toolbar.setNavigationIcon(getResources().getDrawable(value.resourceId, mContext.getTheme()));
toolbar.getMenu().add(Menu.NONE,MENU_RESET,0,com.android.internal.R.string.reset).setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
toolbar.setTitle(R.string.qs_edit);
mRecyclerView =findViewById(android.R.id.list);
mTransparentView =findViewById(R.id.customizer_transparent_view);DefaultItemAnimator animator =newDefaultItemAnimator();
animator.setMoveDuration(TileAdapter.MOVE_DURATION);
mRecyclerView.setItemAnimator(animator);updateTransparentViewHeight();}
qs_customize_panel_content.xml
<mergexmlns:android="http://schemas.android.com/apk/res/android">->
<Viewandroid:id="@+id/customizer_transparent_view"android:layout_width="match_parent"android:layout_height="@dimen/qs_header_system_icons_area_height"android:background="@android:color/transparent"/><com.android.keyguard.AlphaOptimizedLinearLayoutandroid:id="@+id/customize_container"android:layout_width="match_parent"android:layout_height="0dp"android:layout_weight="1"android:orientation="vertical"android:paddingStart="@dimen/qs_customize_internal_side_paddings"android:paddingEnd="@dimen/qs_customize_internal_side_paddings"android:background="@drawable/qs_customizer_background"><Toolbarandroid:id="@*android:id/action_bar"android:layout_width="match_parent"android:layout_height="wrap_content"android:background="@drawable/qs_customizer_toolbar"android:navigationContentDescription="@*android:string/action_bar_up_description"style="@style/QSCustomizeToolbar"/><androidx.recyclerview.widget.RecyclerViewandroid:id="@android:id/list"android:layout_width="match_parent"android:layout_height="0dp"android:layout_weight="1"android:paddingStart="@dimen/qs_customize_internal_side_paddings"android:paddingEnd="@dimen/qs_customize_internal_side_paddings"android:paddingBottom="28dp"android:clipChildren="false"android:clipToPadding="false"android:scrollIndicators="top"android:scrollbars="vertical"android:scrollbarStyle="outsideOverlay"android:importantForAccessibility="auto"/></com.android.keyguard.AlphaOptimizedLinearLayout><Viewandroid:id="@+id/nav_bar_background"android:layout_width="match_parent"android:layout_height="@dimen/navigation_bar_size"android:layout_gravity="bottom"android:background="#ff000000"/></merge>
B ---------->SystemUI启动流程分析
BootLoader：启动加载器是设备启动过程的第一阶段，它初始化硬件并加载操作系统内核。
Linux Kernel：内核是操作系统的核心，负责管理系统资源，如内存、处理器和设备驱动程序。
init：init 是系统启动后运行的第一个用户空间进程（进程ID为1）。它负责启动系统上的其他进程和服务。
Zygote：Zygote是Android中的一个特殊进程，它启动后会加载Java核心库，并为其他应用进程提供服务。它通过fork操作来创建新的应用进程，Zygote 进程在启动后，会创建另一个重要的进程SystemServer进程。
SystemServer：系统服务器是Android中一个关键的守护进程，它启动了Android系统的核心服务，如窗口管理器、活动管理器、包管理器等。
ActivityManagerService：活动管理器服务负责管理应用程序的活动（Activity）生命周期，并处理应用程序的启动和切换
简而言之：
设备开机，BootLoader启动。
加载Linux内核。
内核初始化后，启动init进程。
init进程启动Zygote进程。
Zygote进程启动后，会加载核心库并准备创建应用进程。
系统服务器（SystemServer）启动，它将启动一系列系统服务。
SystemUI启动
SystemServer.run()-> startOtherServices()-> startSystemUi()
SystemServer由ZygoteInit进程创建并启动
于是走到SystemUIService的onCreate()方法
这样相关类就注入结束了，接着回到 SystemUIApplication 的 startServicesIfNeeded() 方法
到此 CoreStartable （SystemUI） 启动流程分析完毕。
C ---------->SystemUI屏幕亮度调节代码分析
上面布局分析没分析这个亮度调节栏，就放这分析吧。
quick_settings_brightness_dialog.xml
<com.android.systemui.settings.brightness.BrightnessSliderViewxmlns:android="http://schemas.android.com/apk/res/android"android:id="@+id/brightness_slider"android:layout_width="match_parent"android:layout_height="@dimen/brightness_mirror_height"android:layout_gravity="center"android:contentDescription="@string/accessibility_brightness"android:importantForAccessibility="no"><com.android.systemui.settings.brightness.ToggleSeekBarandroid:id="@+id/slider"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_gravity="center_vertical"android:minHeight="48dp"android:thumb="@null"android:background="@null"android:paddingStart="0dp"android:paddingEnd="0dp"android:progressDrawable="@drawable/brightness_progress_drawable"android:splitTrack="false"/></com.android.systemui.settings.brightness.BrightnessSliderView>
BrightnessSliderView.java
// Inflated from quick_settings_brightness_dialog@OverrideprotectedvoidonFinishInflate(){super.onFinishInflate();setLayerType(LAYER_TYPE_HARDWARE,null);
mSlider =requireViewById(R.id.slider);
mSlider.setAccessibilityLabel(getContentDescription().toString());// Finds the progress drawable. Assumes brightness_progress_drawable.xmltry{LayerDrawable progress =(LayerDrawable) mSlider.getProgressDrawable();DrawableWrapper progressSlider =(DrawableWrapper) progress
.findDrawableByLayerId(android.R.id.progress);LayerDrawable actualProgressSlider =(LayerDrawable) progressSlider.getDrawable();
mProgressDrawable = actualProgressSlider.findDrawableByLayerId(R.id.slider_foreground);}catch(Exception e){// Nothing to do, mProgressDrawable will be null.}}
BrightnessController.java
privatevolatileboolean mAutomatic;// Brightness adjusted automatically using ambient light.privatevolatileboolean mIsVrModeEnabled;privateboolean mListening;privateboolean mExternalChange;privateboolean mControlValueInitialized;privatefloat mBrightnessMin =PowerManager.BRIGHTNESS_MIN;privatefloat mBrightnessMax =PowerManager.BRIGHTNESS_MAX;
mAutomatic：屏幕亮度是否根据环境光传感器自动调整。
mListening：是否正在监听外部事件
mIsVrModeEnabled：是否启用了虚拟现实（VR）模式（不同亮度的设置）。
mExternalChange：追踪亮度变化是否由外部因素引起，而非用户直接通过滑块进行调整。
mControlValueInitialized：记控制值是否已经被初始化。这确保在应用亮度设置之前，相关的值已经被正确设置。
mBrightnessMin：存储亮度的最小值，默认值为PowerManager.BRIGHTNESS_MIN，这是系统定义的亮度最小值常量。
mBrightnessMax：存储亮度的最大值，默认值为PowerManager.BRIGHTNESS_MAX，这是系统定义的亮度最大值常量。
这些变量是控制亮度逻辑的重要组成部分，它们使得BrightnessSliderView类能够根据不同的条件和用户交互来调整屏幕上的亮度。
BrightnessController.java
privatevoidupdateSlider(float brightnessValue,boolean inVrMode){finalfloat min = mBrightnessMin;finalfloat max = mBrightnessMax;// Ensure the slider is in a fixed position first, then check if we should animate.if(mSliderAnimator !=null&& mSliderAnimator.isStarted()){
mSliderAnimator.cancel();}// convertGammaToLinearFloat returns 0-1if(BrightnessSynchronizer.floatEquals(brightnessValue,convertGammaToLinearExt(mControl.getValue(), min, max))){//[CH108Q][62218]change by chenchuanliang for brightness change smooth merge from CH108Q2022060// If the value in the slider is equal to the value on the current brightness// then the slider does not need to animate, since the brightness will not change.return;}// Returns GAMMA_SPACE_MIN - GAMMA_SPACE_MAX//[CH108Q][62218]change by chenchuanliang for brightness change smooth merge from CH108Q20220602finalint sliderVal =convertLinearToGammaExt(brightnessValue, min, max);animateSliderTo(sliderVal);}
亮度最小值由PowerManager.BRIGHTNESS_MIN控制
D ---------->SystemUI之QS面板分析
1、QS面板构成元素分析
QS面板实际上有多种状态，包括:
1、Quick Quick Settings (QQS) : 即初级展开面板,是一次下拉面板看到的简版QS面板,包含少量的开关，如下左侧的图。
2、Quick Settings (QS) : 完整QS面板,是二次下拉面板看到的完成QS面板,其包含更多的开关，如下右侧的图。
3、另外还有开关编辑面板，开关详情页面。
注：SystemUI中称通知栏下拉面板开关区域中的单个开关为Tile，下面进行分析QS面板中主要的几大类簇。
1、QSTile类簇
packages/SystemUI/plugin/src/com/android/systemui/plugins/qs/QSTile.java
packages/SystemUI/src/com/android/systemui/qs/tileimpl/QSTileImpl.java
packages/SystemUI/src/com/android/systemui/qs/tiles/BluetoothTile.java
packages/SystemUI/src/com/android/systemui/qs/tiles/XxxTile.java
该类簇构成了的Tile的"后端",负责处理单个Tile的逻辑处理,其中:
QSTile：接口，主要定义了所有Tile的通用行为，如注册监听、点击事件的处理，Tile视图中Icon元素(QSIconView)的构建，刷新Tile状态等。
QSTileImpl：实现了QSTile 定义的通用行为，同时提供了一系列的抽象接口(详见类图)允许不同类型的子类去做差异化实现。
后续所有的开关都需要继承自QSTileImpl。如BluetoothTile通过继承QSTileImpl来享用其提供的通用方法,不需要每个开关都去做实现,
同时利用差异化接口便可实现开关自身的特有逻辑,如BluetoothTile的handleClick则可以打开蓝牙开关。
2、QSTileView类簇
packages/SystemUI/plugin/src/com/android/systemui/plugins/qs/QSTileView.java
packages/SystemUI/plugin/src/com/android/systemui/plugins/qs/QSIconView.java
packages/SystemUI/src/com/android/systemui/qs/tileimpl/QSTileViewImpl.kt
packages/SystemUI/src/com/android/systemui/qs/tileimpl/QSIconViewImpl.java
该类簇构成了的Tile的视图层，负责处理单个Tile的界面展示，其中：
QSTileView：抽象类，定义了Tile视图相关的操作，如返回只包含图标的QSIconView、视图刷新onStateChanged(State state)等。
在其构建的视图的基础上，扩展了label相关的东西，label即为开关中的文字描述视图。
QSTileViewImpl：实现了QSTileView中定义的抽象接口，同时在其构造方法中完成了Tile视图的构建，包括背景的处理、点击效果的处理(如ripple)、点击事件的处理等。
3、QSHost类簇
packages/SystemUI/src/com/android/systemui/qs/QSHost.java
packages/SystemUI/src/com/android/systemui/qs/QSTileHost.java
packages/SystemUI/plugin/src/com/android/systemui/plugins/qs/QSFactory.java
packages/SystemUI/src/com/android/systemui/qs/tileimpl/QSFactoryImpl.java
该类簇主要完成单个Tile的构建，其中：
QSHost：接口,主要向外界提供获取QSTile集合的接口(getTiles())以及作为Tile对外沟通的桥梁,例如点击某个开关后需要触发收起面板的操作,开关便会通过QSHost来触发收起面板的操作。
QSTileHost ：实现了QSHost中定义的接口，同时扩展了创建Tile后端对象QSTile和创建Tile视图对象QSTileView的接口。创建时使用了工厂模式，由QSFactoryImpl类实现
其中QSTileHost作为外界创建Tile的入口，会在对象构造的过程中先去创建Tile后端对象QSTile集合，这个集合在后续创建完整Tile对象时会用到。 具体创建哪些Tile则是通过获取配置在 config.xml 中的字段来决定了。具体过程可查看 QSTileHost.onTuningChanged(String key, String newValue) 方法。
config.xml
<!-- The default tiles to display in QuickSettings --><stringname="quick_settings_tiles_default"translatable="false">
internet,bt,flashlight,dnd,alarm,airplane,controls,wallet,rotation,battery,cast,screenrecord,screenshot,mictoggle,cameratoggle,custom(com.android.permissioncontroller/.permission.service.SafetyCenterQsTileService)
</string><!-- luzongrui add screenshot tile 20240328-->
4、QSPanel类簇
packages/SystemUI/src/com/android/systemui/qs/QSPanel.java
packages/SystemUI/src/com/android/systemui/qs/QuickQSPanel.java
packages/SystemUI/src/com/android/systemui/qs/QSTileLayout
packages/SystemUI/src/com/android/systemui/qs/TileLayout.java
packages/SystemUI/src/com/android/systemui/qs/PagedTileLayout.java
该类簇主要完成QS面板元素的动态添加,其中:
QSPanel：对应我们前面说的QS面板,即二次展开面板,是该页面的顶层容器,其嵌套在一个ScrollView中. 负责动态添加相应的元素,添加的元素包括 [亮度条 / 根据屏幕方向动态添加开关容器 QSTileLayout / Footer ] 等。
同时为这些元素提供了一系列的操作接口，如：
1、为开关容器创建具体开关对象(通过QSHost) 并为其添加刷新监听器,在后续开关后端收到开关状态刷新需求时,将刷新需求分发到对应的开关视图层.
2、开关详情页(Details)的创建与刷新
3、QS面板展开状态变化时做相应的处理(setExpanded(boolean expanded))
QuickQSPanel：对应我们前面说的初级展开面板QQS面板，继承自QSPanel并对展示的Tile数做了限制(通过setMaxTiles(int))，
同时复写了父类提供的添加子元素的方法，按需添加QQS面板的元素，因为QQS面板是QS面板的精简版，所以很多子元素未做添加。
QSTileLayout：开关容器接口，主要定义了开关容器绘制相关的接口。
TileLayout：QQS面板开关容器类，负责精简QS面板的绘制，继承自 Viewgroup
PagedTileLayout：QS面板开关容器类，负责QS面板的绘制，继承自 ViewPager
5、QS类簇
packages/SystemUI/plugin/src/com/android/systemui/plugins/qs/QS.java
packages/SystemUI/src/com/android/systemui/qs/QSFragment.java
packages/SystemUI/src/com/android/systemui/qs/QSContainerImpl.java
该类簇主要作为整个QS面板的顶层容器，主要处理QS面板的展开/收起逻辑，其中：
QS：接口，主要定义了 QS 面板展开/收起相关的接口。
QSFragment：继承自 Fragment，实现了 QS 接口，主要负责接收 QS 面板展开/收起状态的改变,并将最新状态同步给该 Fragment 中的 View 元素,如 QSContainerImpl。
QSContainerImpl：添加到QSFragment中的自定义 View,继承自FrameLayout对应布局 qs_panel.xml ,主要通过接收来自 QSFragment 的面板展开/收起状态的变化并做刷新。
2、QS面板内部实现梳理
a：QS面板开关集合构建流程
QsPanel 中除了创建各个开关View，还创建了亮度条,Footer等元素。另外QsFragment / QSHost 等元素是在 SystemUI 启动流程中通过注入或反射构建的，其前期构建流程跳过分析，先看看整体的流程图。
简单说就是QSTileHost对象在构建初期就借助QSFactoryImpl工具对象提前创建好了各个开关的后端对象QSTile，而后QSPanel在初始化的过程中，再次利用QSTileHost去构建各个开关的视图对象QSTileView，至此一个完整的开关就构建完成，最后add到开关容器PagedTileLayout中去。
b：Tile后端是如何与Tile视图层联系的
前面QSTile的类簇中我们可以看到其有多个内部类，与此相关的内部类包括 Callback 和 State。
Tile 视图与后端的联系就是借助这两个内部类以及QSPanel这个中介产生联系的。
前面 在梳理QS面板开关集合构建流程时可以看到步骤10通过addTile函数来构建Tile开关对象，其代码细节如下：
QSPanel.java
finalvoidaddTile(QSPanelControllerBase.TileRecord tileRecord){finalQSTile.Callback callback =newQSTile.Callback(){@OverridepublicvoidonStateChanged(QSTile.State state){drawTile(tileRecord, state);}};
tileRecord.tile.addCallback(callback);
tileRecord.callback = callback;
tileRecord.tileView.init(tileRecord.tile);
tileRecord.tile.refreshState();if(mTileLayout !=null){
mTileLayout.addTile(tileRecord);}}
可以看到QSPanel向 tileRecord.tile 即后端注册了一个回调器，并在回调发生时将开关状态State传递给 tileRecord.tileView， 即开关视图层去做视图刷新。
c： Tile的一次点击事件背后的流程是怎么样的
上面介绍addTile函数时可以看到一句tileRecord.tileView.init(tileRecord.tile);这里完成了将视图层的点击事件转交给后端的操作。
QSTileViewImpl.kt
overridefuninit(tile: QSTile){init({ v: View?-> tile.click(this)},{ view: View?->
tile.longClick(this)true})}privatefuninit(
click: OnClickListener?,
longClick: OnLongClickListener?){setOnClickListener(click)
onLongClickListener = longClick
}
即将QSTileView收到的点击事件或长按事件分别交给QSTile对应的点击、长按函数处理。
QSTile.java是一个接口，具体的实现逻辑是在QSTileImpl.java中。
QSTileImpl.java
publicvoidclick(@NullableView view){
mMetricsLogger.write(populate(newLogMaker(ACTION_QS_CLICK).setType(TYPE_ACTION).addTaggedData(FIELD_STATUS_BAR_STATE,
mStatusBarStateController.getState())));
mUiEventLogger.logWithInstanceId(QSEvent.QS_ACTION_CLICK,0,getMetricsSpec(),getInstanceId());finalint eventId = mClickEventId++;
mQSLogger.logTileClick(mTileSpec, mStatusBarStateController.getState(), mState.state,
eventId);if(!mFalsingManager.isFalseTap(FalsingManager.LOW_PENALTY)){
mHandler.obtainMessage(H.CLICK, eventId,0, view).sendToTarget();}}publicvoidsecondaryClick(@NullableView view){
mMetricsLogger.write(populate(newLogMaker(ACTION_QS_SECONDARY_CLICK).setType(TYPE_ACTION).addTaggedData(FIELD_STATUS_BAR_STATE,
mStatusBarStateController.getState())));
mUiEventLogger.logWithInstanceId(QSEvent.QS_ACTION_SECONDARY_CLICK,0,getMetricsSpec(),getInstanceId());finalint eventId = mClickEventId++;
mQSLogger.logTileSecondaryClick(mTileSpec, mStatusBarStateController.getState(),
mState.state, eventId);
mHandler.obtainMessage(H.SECONDARY_CLICK, eventId,0, view).sendToTarget();}@OverridepublicvoidlongClick(@NullableView view){
mMetricsLogger.write(populate(newLogMaker(ACTION_QS_LONG_PRESS).setType(TYPE_ACTION).addTaggedData(FIELD_STATUS_BAR_STATE,
mStatusBarStateController.getState())));
mUiEventLogger.logWithInstanceId(QSEvent.QS_ACTION_LONG_PRESS,0,getMetricsSpec(),getInstanceId());finalint eventId = mClickEventId++;
mQSLogger.logTileLongClick(mTileSpec, mStatusBarStateController.getState(), mState.state,
eventId);
mHandler.obtainMessage(H.LONG_CLICK, eventId,0, view).sendToTarget();}
QSTileImpl.java
protectedfinalclassHextendsHandler{privatestaticfinalintADD_CALLBACK=1;privatestaticfinalintCLICK=2;privatestaticfinalintSECONDARY_CLICK=3;privatestaticfinalintLONG_CLICK=4;privatestaticfinalintREFRESH_STATE=5;privatestaticfinalintUSER_SWITCH=6;privatestaticfinalintDESTROY=7;privatestaticfinalintREMOVE_CALLBACKS=8;privatestaticfinalintREMOVE_CALLBACK=9;privatestaticfinalintSET_LISTENING=10;@VisibleForTestingprotectedstaticfinalintSTALE=11;privatestaticfinalintINITIALIZE=12;@VisibleForTestingprotectedH(Looper looper){super(looper);}@OverridepublicvoidhandleMessage(Message msg){String name =null;try{if(msg.what ==ADD_CALLBACK){
name ="handleAddCallback";handleAddCallback((QSTile.Callback) msg.obj);}elseif(msg.what ==REMOVE_CALLBACKS){
name ="handleRemoveCallbacks";handleRemoveCallbacks();}elseif(msg.what ==REMOVE_CALLBACK){
name ="handleRemoveCallback";handleRemoveCallback((QSTile.Callback) msg.obj);}elseif(msg.what ==CLICK){
name ="handleClick";if(mState.disabledByPolicy){Intent intent =RestrictedLockUtils.getShowAdminSupportDetailsIntent(
mContext, mEnforcedAdmin);
mActivityStarter.postStartActivityDismissingKeyguard(intent,0);}else{
mQSLogger.logHandleClick(mTileSpec, msg.arg1);handleClick((View) msg.obj);}}elseif(msg.what ==SECONDARY_CLICK){
name ="handleSecondaryClick";
mQSLogger.logHandleSecondaryClick(mTileSpec, msg.arg1);handleSecondaryClick((View) msg.obj);}elseif(msg.what ==LONG_CLICK){
name ="handleLongClick";
mQSLogger.logHandleLongClick(mTileSpec, msg.arg1);handleLongClick((View) msg.obj);}elseif(msg.what ==REFRESH_STATE){
name ="handleRefreshState";handleRefreshState(msg.obj);}elseif(msg.what ==USER_SWITCH){
name ="handleUserSwitch";handleUserSwitch(msg.arg1);}elseif(msg.what ==DESTROY){
name ="handleDestroy";handleDestroy();}elseif(msg.what ==SET_LISTENING){
name ="handleSetListeningInternal";handleSetListeningInternal(msg.obj, msg.arg1 !=0);}elseif(msg.what ==STALE){
name ="handleStale";handleStale();}elseif(msg.what ==INITIALIZE){
name ="initialize";handleInitialize();}else{thrownewIllegalArgumentException("Unknown msg: "+ msg.what);}}catch(Throwable t){finalString error ="Error in "+ name;Log.w(TAG, error, t);}}}
protectedfinalvoidhandleRefreshState(@NullableObject arg){handleUpdateState(mTmpState, arg);boolean changed = mTmpState.copyTo(mState);if(mReadyState ==READY_STATE_READYING){
mReadyState =READY_STATE_READY;
changed =true;}if(changed){
mQSLogger.logTileUpdated(mTileSpec, mState);handleStateChanged();}
mHandler.removeMessages(H.STALE);
mHandler.sendEmptyMessageDelayed(H.STALE,getStaleTimeout());setListening(mStaleListener,false);}privatevoidhandleStateChanged(){if(mCallbacks.size()!=0){for(int i =0; i < mCallbacks.size(); i++){
mCallbacks.get(i).onStateChanged(mState);}}}
可以看到QSTileImpl用一个State类型的临时变量去handleUpdateState函数中收集当前开关的最新状态，而这个函数是个抽象方法，实现依旧是在各个开关子类中，我们看下Bluetooth开关
BluetoothTile.java
@OverrideprotectedvoidhandleUpdateState(BooleanState state,Object arg){checkIfRestrictionEnforcedByAdminOnly(state,UserManager.DISALLOW_BLUETOOTH);finalboolean transientEnabling = arg ==ARG_SHOW_TRANSIENT_ENABLING;finalboolean enabled = transientEnabling || mController.isBluetoothEnabled();finalboolean connected = mController.isBluetoothConnected();finalboolean connecting = mController.isBluetoothConnecting();
state.isTransient = transientEnabling || connecting ||
mController.getBluetoothState()==BluetoothAdapter.STATE_TURNING_ON;if(!enabled ||!connected || state.isTransient){stopListeningToStaleDeviceMetadata();}
state.dualTarget =true;
state.value = enabled;if(state.slash ==null){
state.slash =newSlashState();}
state.slash.isSlashed =!enabled;
state.label = mContext.getString(R.string.quick_settings_bluetooth_label);
state.secondaryLabel =TextUtils.emptyIfNull(getSecondaryLabel(enabled, connecting, connected, state.isTransient));
state.contentDescription = mContext.getString(R.string.accessibility_quick_settings_bluetooth);
state.stateDescription ="";if(enabled){if(connected){
state.icon =ResourceIcon.get(R.drawable.qs_bluetooth_icon_on);if(!TextUtils.isEmpty(mController.getConnectedDeviceName())){
state.label = mController.getConnectedDeviceName();}
state.stateDescription =
mContext.getString(R.string.accessibility_bluetooth_name, state.label)+", "+ state.secondaryLabel;}elseif(state.isTransient){
state.icon =ResourceIcon.get(R.drawable.qs_bluetooth_icon_search);
state.stateDescription = state.secondaryLabel;}else{
state.icon =ResourceIcon.get(R.drawable.qs_bluetooth_icon_off);
state.stateDescription = mContext.getString(R.string.accessibility_not_connected);}
state.state =Tile.STATE_ACTIVE;}else{
state.icon =ResourceIcon.get(R.drawable.qs_bluetooth_icon_off);
state.state =Tile.STATE_INACTIVE;}
state.expandedAccessibilityClassName =Switch.class.getName();}
handleUpdateState函数收集完开关状态后，如果开关状态发生了改变则会导致handleStateChanged() 被调用
QSTileImpl.java
privatevoidhandleStateChanged(){if(mCallbacks.size()!=0){for(int i =0; i < mCallbacks.size(); i++){
mCallbacks.get(i).onStateChanged(mState);}}}
QSPanel.java
finalvoidaddTile(QSPanelControllerBase.TileRecord tileRecord){finalQSTile.Callback callback =newQSTile.Callback(){@OverridepublicvoidonStateChanged(QSTile.State state){drawTile(tileRecord, state);}};
tileRecord.tile.addCallback(callback);
tileRecord.callback = callback;
tileRecord.tileView.init(tileRecord.tile);
tileRecord.tile.refreshState();if(mTileLayout !=null){
mTileLayout.addTile(tileRecord);}}
这里就和前面（Tile后端是如何与Tile视图层联系的）关联起来了，即 state会被传递到视图层。
QSTileView.java
publicabstractvoidonStateChanged(State state);
QSTileViewImpl.kt
overridefunonStateChanged(state: QSTile.State){// We cannot use the handler here because sometimes, the views are not attached (if they// are in a page that the ViewPager hasn't attached). Instead, we use a runnable where// all its instances are `equal` to each other, so they can be used to remove them from the// queue.// This means that at any given time there's at most one enqueued runnable to change state.// However, as we only ever care about the last state posted, this is fine.val runnable =StateChangeRunnable(state.copy())removeCallbacks(runnable)post(runnable)}
当Tile的状态发生变化时，创建一个任务来处理这个变化。通过 post 方法，状态更新的操作将在适当的时机异步执行。
innerclassStateChangeRunnable(privateval state: QSTile.State): Runnable {overridefunrun(){handleStateChanged(state)}// We want all instances of this runnable to be equal to each other, so they can be used to// remove previous instances from the Handler/RunQueue of this viewoverridefunequals(other: Any?): Boolean {return other is StateChangeRunnable
}// This makes sure that all instances have the same hashcode (because they are `equal`)overridefunhashCode(): Int {return StateChangeRunnable::class.hashCode()}}
handleStateChanged函数是真正做开关视图显示刷新的地方
// HANDLE STATE CHANGES RELATED METHODSprotectedopenfunhandleStateChanged(state: QSTile.State){val allowAnimations =animationsEnabled()
showRippleEffect = state.showRippleEffect
isClickable = state.state != Tile.STATE_UNAVAILABLE
isLongClickable = state.handlesLongClick
icon.setIcon(state, allowAnimations)
contentDescription = state.contentDescription
// State handling and descriptionval stateDescription =StringBuilder()val arrayResId = SubtitleArrayMapping.getSubtitleId(state.spec)val stateText = state.getStateText(arrayResId, resources)
state.secondaryLabel = state.getSecondaryLabel(stateText)if(!TextUtils.isEmpty(stateText)){
stateDescription.append(stateText)}if(state.disabledByPolicy && state.state != Tile.STATE_UNAVAILABLE){
stateDescription.append(", ")
stateDescription.append(getUnavailableText(state.spec))}if(!TextUtils.isEmpty(state.stateDescription)){
stateDescription.append(", ")
stateDescription.append(state.stateDescription)if(lastState != INVALID && state.state == lastState &&
state.stateDescription != lastStateDescription){
stateDescriptionDeltas = state.stateDescription
}}setStateDescription(stateDescription.toString())
lastStateDescription = state.stateDescription
accessibilityClass =if(state.state == Tile.STATE_UNAVAILABLE){null}else{
state.expandedAccessibilityClassName
}if(state is BooleanState){val newState = state.value
if(tileState != newState){
tileState = newState
}}//// Labelsif(!Objects.equals(label.text, state.label)){
label.text = state.label
}if(!Objects.equals(secondaryLabel.text, state.secondaryLabel)){
secondaryLabel.text = state.secondaryLabel
secondaryLabel.visibility =if(TextUtils.isEmpty(state.secondaryLabel)){
GONE
}else{
VISIBLE
}}// Colorsif(state.state != lastState || state.disabledByPolicy != lastDisabledByPolicy){
singleAnimator.cancel()
mQsLogger?.logTileBackgroundColorUpdateIfInternetTile(
state.spec,
state.state,
state.disabledByPolicy,getBackgroundColorForState(state.state, state.disabledByPolicy))if(allowAnimations){
singleAnimator.setValues(colorValuesHolder(
BACKGROUND_NAME,
paintColor,getBackgroundColorForState(state.state, state.disabledByPolicy)),colorValuesHolder(
LABEL_NAME,
label.currentTextColor,getLabelColorForState(state.state, state.disabledByPolicy)),colorValuesHolder(
SECONDARY_LABEL_NAME,
secondaryLabel.currentTextColor,getSecondaryLabelColorForState(state.state, state.disabledByPolicy)),colorValuesHolder(
CHEVRON_NAME,
chevronView.imageTintList?.defaultColor ?:0,getChevronColorForState(state.state, state.disabledByPolicy)))
singleAnimator.start()}else{setAllColors(getBackgroundColorForState(state.state, state.disabledByPolicy),getLabelColorForState(state.state, state.disabledByPolicy),getSecondaryLabelColorForState(state.state, state.disabledByPolicy),getChevronColorForState(state.state, state.disabledByPolicy))}}// Right side iconloadSideViewDrawableIfNecessary(state)
label.isEnabled =!state.disabledByPolicy
lastState = state.state
lastDisabledByPolicy = state.disabledByPolicy
}
至此，就将开关点击背后的流程梳理清楚了
E ---------->SystemUI系统导航栏浅析
NavigationBar在CentralSurfacesImpl中调用start()时进行初始化
CentralSurfacesImpl.java
@OverridepublicvoidcreateAndAddWindows(@NullableRegisterStatusBarResult result){makeStatusBarView(result);
mNotificationShadeWindowController.attach();
mStatusBarWindowController.attach();}
protectedvoidcreateNavigationBar(@NullableRegisterStatusBarResult result){
mNavigationBarController.createNavigationBars(true/* includeDefaultDisplay */, result);}
NavigationBarController.java
/**
* Adds a navigation bar on default display or an external display if the display supports
* system decorations.
*
* @param display the display to add navigation bar on.
*/@VisibleForTestingvoidcreateNavigationBar(Display display,Bundle savedState,RegisterStatusBarResult result){if(display ==null){return;}finalint displayId = display.getDisplayId();finalboolean isOnDefaultDisplay = displayId == mDisplayTracker.getDefaultDisplayId();if(!shouldCreateNavBarAndTaskBar(displayId)){return;}// We may show TaskBar on the default display for large screen device. Don't need to create// navigation bar for this case.if(isOnDefaultDisplay &&initializeTaskbarIfNecessary()){return;}finalContext context = isOnDefaultDisplay
? mContext
: mContext.createDisplayContext(display);NavigationBarComponent component = mNavigationBarComponentFactory.create(
context, savedState);NavigationBar navBar = component.getNavigationBar();
navBar.init();
mNavigationBars.put(displayId, navBar);
navBar.addOnAttachStateChangeListener(newView.OnAttachStateChangeListener(){@OverridepublicvoidonViewAttachedToWindow(View v){if(result !=null){
navBar.setImeWindowStatus(display.getDisplayId(), result.mImeToken,
result.mImeWindowVis, result.mImeBackDisposition,
result.mShowImeSwitcher);}}@OverridepublicvoidonViewDetachedFromWindow(View v){
v.removeOnAttachStateChangeListener(this);}});}
这个方法确保了在适当的条件下为每个显示设备创建导航栏。
privatebooleanshouldCreateNavBarAndTaskBar(int displayId){finalIWindowManager wms =WindowManagerGlobal.getWindowManagerService();try{return wms.hasNavigationBar(displayId);}catch(RemoteException e){// Cannot get wms, just return false with warning message.Log.w(TAG,"Cannot get WindowManager.");returnfalse;}}
调用IWindowManager的hasNavigationBar方法来判断系统是否存在导航栏
NavigationBarComponent.java
packagecom.android.systemui.navigationbar;importstaticjava.lang.annotation.RetentionPolicy.RUNTIME;importandroid.content.Context;importandroid.os.Bundle;importandroidx.annotation.Nullable;importcom.android.systemui.dagger.qualifiers.DisplayId;importjava.lang.annotation.Documented;importjava.lang.annotation.Retention;importjavax.inject.Scope;importdagger.BindsInstance;importdagger.Subcomponent;/**
* Subcomponent for a NavigationBar.
*
* Generally creatd on a per-display basis.
*/@Subcomponent(modules ={NavigationBarModule.class})@NavigationBarComponent.NavigationBarScopepublicinterfaceNavigationBarComponent{/** Factory for {@link NavigationBarComponent}. */@Subcomponent.FactoryinterfaceFactory{NavigationBarComponentcreate(@BindsInstance@DisplayIdContext context,@BindsInstance@NullableBundle savedState);}/** */NavigationBargetNavigationBar();/**
* Scope annotation for singleton items within the NavigationBarComponent.
*/@Documented@Retention(RUNTIME)@Scope@interfaceNavigationBarScope{}}
NavigationBarModule.java
packagecom.android.systemui.navigationbar;importandroid.content.Context;importandroid.view.LayoutInflater;importandroid.view.View;importandroid.view.WindowManager;importcom.android.systemui.R;importcom.android.systemui.dagger.qualifiers.DisplayId;importcom.android.systemui.navigationbar.NavigationBarComponent.NavigationBarScope;importcom.android.systemui.navigationbar.gestural.EdgeBackGestureHandler;importdagger.Module;importdagger.Provides;/** Module for {@link com.android.systemui.navigationbar.NavigationBarComponent}. */@ModulepublicinterfaceNavigationBarModule{/** A Layout inflater specific to the display's context. */@Provides@NavigationBarScope@DisplayIdstaticLayoutInflaterprovideLayoutInflater(@DisplayIdContext context){returnLayoutInflater.from(context);}/** */@Provides@NavigationBarScopestaticNavigationBarFrameprovideNavigationBarFrame(@DisplayIdLayoutInflater layoutInflater){return(NavigationBarFrame) layoutInflater.inflate(R.layout.navigation_bar_window,null);}/** */@Provides@NavigationBarScopestaticNavigationBarViewprovideNavigationBarview(@DisplayIdLayoutInflater layoutInflater,NavigationBarFrame frame){View barView = layoutInflater.inflate(R.layout.navigation_bar, frame);return barView.findViewById(R.id.navigation_bar_view);}/** */@Provides@NavigationBarScopestaticEdgeBackGestureHandlerprovideEdgeBackGestureHandler(EdgeBackGestureHandler.Factory factory,@DisplayIdContext context){return factory.create(context);}/** A WindowManager specific to the display's context. */@Provides@NavigationBarScope@DisplayIdstaticWindowManagerprovideWindowManager(@DisplayIdContext context){return context.getSystemService(WindowManager.class);}}
navigation_bar.xml
<com.android.systemui.navigationbar.NavigationBarViewxmlns:android="http://schemas.android.com/apk/res/android"android:id="@+id/navigation_bar_view"android:layout_height="match_parent"android:layout_width="match_parent"android:clipChildren="false"android:clipToPadding="false"android:background="@drawable/system_bar_background"><com.android.systemui.navigationbar.NavigationBarInflaterViewandroid:id="@+id/navigation_inflater"android:layout_width="match_parent"android:layout_height="match_parent"android:clipChildren="false"android:clipToPadding="false"/></com.android.systemui.navigationbar.NavigationBarView>
NavigationBarInflaterView.java
privatevoidinflateChildren(){removeAllViews();
mHorizontal =(FrameLayout) mLayoutInflater.inflate(R.layout.navigation_layout,this/* root */,false/* attachToRoot */);addView(mHorizontal);
mVertical =(FrameLayout) mLayoutInflater.inflate(R.layout.navigation_layout_vertical,this/* root */,false/* attachToRoot */);addView(mVertical);updateAlternativeOrder();}
下面以navigation_layout.xml文件为例
navigation_layout.xml
<FrameLayoutxmlns:android="http://schemas.android.com/apk/res/android"xmlns:systemui="http://schemas.android.com/apk/res-auto"android:layout_width="match_parent"android:layout_height="match_parent"android:layout_marginStart="@dimen/rounded_corner_content_padding"android:layout_marginEnd="@dimen/rounded_corner_content_padding"android:paddingStart="@dimen/nav_content_padding"android:paddingEnd="@dimen/nav_content_padding"android:clipChildren="false"android:clipToPadding="false"android:id="@+id/horizontal"><com.android.systemui.navigationbar.buttons.NearestTouchFrameandroid:id="@+id/nav_buttons"android:layout_width="match_parent"android:layout_height="match_parent"android:clipChildren="false"android:clipToPadding="false"systemui:isVertical="false"><LinearLayoutandroid:id="@+id/ends_group"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="horizontal"android:clipToPadding="false"android:clipChildren="false"/><LinearLayoutandroid:id="@+id/center_group"android:layout_width="wrap_content"android:layout_height="match_parent"android:layout_gravity="center"android:gravity="center"android:orientation="horizontal"android:clipToPadding="false"android:clipChildren="false"/></com.android.systemui.navigationbar.buttons.NearestTouchFrame></FrameLayout>
NavigationBarInflaterView.java
@OverrideprotectedvoidonFinishInflate(){super.onFinishInflate();inflateChildren();clearViews();inflateLayout(getDefaultLayout());}privatevoidinflateChildren(){removeAllViews();
mHorizontal =(FrameLayout) mLayoutInflater.inflate(R.layout.navigation_layout,this/* root */,false/* attachToRoot */);addView(mHorizontal);
mVertical =(FrameLayout) mLayoutInflater.inflate(R.layout.navigation_layout_vertical,this/* root */,false/* attachToRoot */);addView(mVertical);updateAlternativeOrder();}
addView在class ReverseLinearLayout extends LinearLayout中实现了方法的重写
addView(mHorizontal)将 mHorizontal 视图添加到当前 ViewGroup 中
protectedvoidinflateLayout(String newLayout){
mCurrentLayout = newLayout;if(newLayout ==null){
newLayout =getDefaultLayout();}String[] sets = newLayout.split(GRAVITY_SEPARATOR,3);if(sets.length !=3){Log.d(TAG,"Invalid layout.");
newLayout =getDefaultLayout();
sets = newLayout.split(GRAVITY_SEPARATOR,3);}String[] start = sets[0].split(BUTTON_SEPARATOR);String[] center = sets[1].split(BUTTON_SEPARATOR);String[] end = sets[2].split(BUTTON_SEPARATOR);// Inflate these in start to end order or accessibility traversal will be messed up.inflateButtons(start, mHorizontal.findViewById(R.id.ends_group),false/* landscape */,true/* start */);inflateButtons(start, mVertical.findViewById(R.id.ends_group),true/* landscape */,true/* start */);inflateButtons(center, mHorizontal.findViewById(R.id.center_group),false/* landscape */,false/* start */);inflateButtons(center, mVertical.findViewById(R.id.center_group),true/* landscape */,false/* start */);addGravitySpacer(mHorizontal.findViewById(R.id.ends_group));addGravitySpacer(mVertical.findViewById(R.id.ends_group));inflateButtons(end, mHorizontal.findViewById(R.id.ends_group),false/* landscape */,false/* start */);inflateButtons(end, mVertical.findViewById(R.id.ends_group),true/* landscape */,false/* start */);updateButtonDispatchersCurrentView();}
privatevoidinflateButtons(String[] buttons,ViewGroup parent,boolean landscape,boolean start){for(int i =0; i < buttons.length; i++){inflateButton(buttons[i], parent, landscape, start);}}privateViewGroup.LayoutParamscopy(ViewGroup.LayoutParams layoutParams){if(layoutParams instanceofLinearLayout.LayoutParams){returnnewLinearLayout.LayoutParams(layoutParams.width, layoutParams.height,((LinearLayout.LayoutParams) layoutParams).weight);}returnnewLayoutParams(layoutParams.width, layoutParams.height);}@NullableprotectedViewinflateButton(String buttonSpec,ViewGroup parent,boolean landscape,boolean start){LayoutInflater inflater = landscape ? mLandscapeInflater : mLayoutInflater;View v =createView(buttonSpec, parent, inflater);if(v ==null)returnnull;
v =applySize(v, buttonSpec, landscape, start);
parent.addView(v);addToDispatchers(v);View lastView = landscape ? mLastLandscape : mLastPortrait;View accessibilityView = v;if(v instanceofReverseRelativeLayout){
accessibilityView =((ReverseRelativeLayout) v).getChildAt(0);}if(lastView !=null){
accessibilityView.setAccessibilityTraversalAfter(lastView.getId());}if(landscape){
mLastLandscape = accessibilityView;}else{
mLastPortrait = accessibilityView;}return v;}
ViewcreateView(String buttonSpec,ViewGroup parent,LayoutInflater inflater){View v =null;String button =extractButton(buttonSpec);if(LEFT.equals(button)){
button =extractButton(NAVSPACE);}elseif(RIGHT.equals(button)){
button =extractButton(MENU_IME_ROTATE);}if(HOME.equals(button)){
v = inflater.inflate(R.layout.home, parent,false);}elseif(BACK.equals(button)){
v = inflater.inflate(R.layout.back, parent,false);}elseif(RECENT.equals(button)){
v = inflater.inflate(R.layout.recent_apps, parent,false);}elseif(MENU_IME_ROTATE.equals(button)){
v = inflater.inflate(R.layout.menu_ime, parent,false);}elseif(NAVSPACE.equals(button)){
v = inflater.inflate(R.layout.nav_key_space, parent,false);}elseif(CLIPBOARD.equals(button)){
v = inflater.inflate(R.layout.clipboard, parent,false);}elseif(CONTEXTUAL.equals(button)){
v = inflater.inflate(R.layout.contextual, parent,false);}elseif(HOME_HANDLE.equals(button)){
v = inflater.inflate(R.layout.home_handle, parent,false);}elseif(IME_SWITCHER.equals(button)){
v = inflater.inflate(R.layout.ime_switcher, parent,false);}elseif(button.startsWith(KEY)){String uri =extractImage(button);int code =extractKeycode(button);
v = inflater.inflate(R.layout.custom_key, parent,false);((KeyButtonView) v).setCode(code);if(uri !=null){if(uri.contains(":")){((KeyButtonView) v).loadAsync(Icon.createWithContentUri(uri));}elseif(uri.contains("/")){int index = uri.indexOf('/');String pkg = uri.substring(0, index);int id =Integer.parseInt(uri.substring(index +1));((KeyButtonView) v).loadAsync(Icon.createWithResource(pkg, id));}}}return v;}
KeyButtonView类是一个自定义视图，用于创建导航栏中的按键，如 Home、Back、Recent Apps等。这个类扩展了 ImageView 以提供额外的功能，如处理触摸事件、播放声音效果、发送按键事件等。
launcher.xml
<com.android.launcher3.LauncherRootViewxmlns:android="http://schemas.android.com/apk/res/android"xmlns:launcher="http://schemas.android.com/apk/res-auto"android:id="@+id/launcher"android:layout_width="match_parent"android:layout_height="match_parent"android:fitsSystemWindows="true"><com.android.launcher3.dragndrop.DragLayerandroid:id="@+id/drag_layer"android:layout_width="match_parent"android:layout_height="match_parent"android:clipChildren="false"android:clipToPadding="false"android:importantForAccessibility="no"><com.android.launcher3.views.AccessibilityActionsViewandroid:layout_width="match_parent"android:layout_height="match_parent"android:contentDescription="@string/home_screen"/><!-- The workspace contains 5 screens of cells --><!-- DO NOT CHANGE THE ID --><com.android.launcher3.Workspaceandroid:id="@+id/workspace"android:layout_width="match_parent"android:layout_height="match_parent"android:layout_gravity="center"android:theme="@style/HomeScreenElementTheme"launcher:pageIndicator="@+id/page_indicator"/><!-- DO NOT CHANGE THE ID --><includeandroid:id="@+id/hotseat"layout="@layout/hotseat"/><!-- Keep these behind the workspace so that they are not visible when
we go into AllApps --><com.android.launcher3.pageindicators.WorkspacePageIndicatorandroid:id="@+id/page_indicator"android:layout_width="match_parent"android:layout_height="@dimen/workspace_page_indicator_height"android:layout_gravity="bottom|center_horizontal"android:theme="@style/HomeScreenElementTheme"/><includeandroid:id="@+id/drop_target_bar"layout="@layout/drop_target_bar"/><com.android.launcher3.views.ScrimViewandroid:layout_width="match_parent"android:layout_height="match_parent"android:id="@+id/scrim_view"android:background="@android:color/transparent"/><includeandroid:id="@+id/overview_panel"layout="@layout/overview_panel"/><includeandroid:id="@+id/apps_view"layout="@layout/all_apps"android:layout_width="match_parent"android:layout_height="match_parent"/></com.android.launcher3.dragndrop.DragLayer></com.android.launcher3.LauncherRootView>
overview_panel.xml
<mergexmlns:android="http://schemas.android.com/apk/res/android"><com.android.quickstep.views.LauncherRecentsViewandroid:id="@+id/overview_panel"android:layout_width="match_parent"android:layout_height="match_parent"android:accessibilityPaneTitle="@string/accessibility_recent_apps"android:clipChildren="false"android:clipToPadding="false"android:visibility="invisible"/><includeandroid:id="@+id/overview_actions_view"layout="@layout/overview_actions_container"/></merge>
overview_actions_container.xml
<com.android.quickstep.views.OverviewActionsViewxmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_marginBottom="20dp"android:layout_gravity="center_horizontal|bottom"><LinearLayoutandroid:id="@+id/action_buttons"android:layout_width="match_parent"android:layout_height="@dimen/overview_actions_height"android:layout_gravity="bottom|center_horizontal"android:orientation="horizontal"><Spaceandroid:layout_width="0dp"android:layout_height="1dp"android:layout_weight="1"/><Buttonandroid:id="@+id/action_screenshot"style="@style/OverviewActionButton"android:layout_width="wrap_content"android:layout_height="wrap_content"android:drawableStart="@drawable/ic_screenshot"android:text="@string/action_screenshot"android:theme="@style/ThemeControlHighlightWorkspaceColor"/><Spaceandroid:id="@+id/action_split_space"android:layout_width="@dimen/overview_actions_button_spacing"android:layout_height="1dp"android:visibility="gone"/><Buttonandroid:id="@+id/action_split"style="@style/OverviewActionButton"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="@string/action_split"android:theme="@style/ThemeControlHighlightWorkspaceColor"android:visibility="gone"/><Spaceandroid:layout_width="0dp"android:layout_height="1dp"android:layout_weight="1"/><Spaceandroid:id="@+id/oav_three_button_space"android:layout_width="0dp"android:layout_height="1dp"android:layout_weight="1"android:visibility="gone"/></LinearLayout></com.android.quickstep.views.OverviewActionsView>
RecentView.java
publicRecentsView(Context context,@NullableAttributeSet attrs,int defStyleAttr,BaseActivityInterface sizeStrategy){super(context, attrs, defStyleAttr);setEnableFreeScroll(true);
mSizeStrategy = sizeStrategy;
mActivity =BaseActivity.fromContext(context);
mOrientationState =newRecentsOrientedState(
context, mSizeStrategy,this::animateRecentsRotationInPlace);finalint rotation = mActivity.getDisplay().getRotation();
mOrientationState.setRecentsRotation(rotation);
mScrollHapticMinGapMillis =getResources().getInteger(R.integer.recentsScrollHapticMinGapMillis);
mFastFlingVelocity =getResources().getDimensionPixelSize(R.dimen.recents_fast_fling_velocity);
mModel =RecentsModel.INSTANCE.get(context);
mIdp =InvariantDeviceProfile.INSTANCE.get(context);
mClearAllButton =(ClearAllButton)LayoutInflater.from(context).inflate(R.layout.overview_clear_all_button,this,false);
mClearAllButton.setOnClickListener(this::dismissAllTasks);
mTaskViewPool =newViewPool<>(context,this,R.layout.task,20/* max size */,10/* initial size */);
mGroupedTaskViewPool =newViewPool<>(context,this,R.layout.task_grouped,20/* max size */,10/* initial size */);
mDesktopTaskViewPool =newViewPool<>(context,this,R.layout.task_desktop,5/* max size */,1/* initial size */);
mIsRtl = mOrientationHandler.getRecentsRtlSetting(getResources());setLayoutDirection(mIsRtl ?View.LAYOUT_DIRECTION_RTL:View.LAYOUT_DIRECTION_LTR);
mSplitPlaceholderSize =getResources().getDimensionPixelSize(R.dimen.split_placeholder_size);
mSplitPlaceholderInset =getResources().getDimensionPixelSize(R.dimen.split_placeholder_inset);
mSquaredTouchSlop =squaredTouchSlop(context);
mClampedScrollOffsetBound =getResources().getDimensionPixelSize(R.dimen.transient_taskbar_clamped_offset_bound);
mEmptyIcon = context.getDrawable(R.drawable.ic_empty_recents);
mEmptyIcon.setCallback(this);
mEmptyMessage = context.getText(R.string.recents_empty_message);
mEmptyMessagePaint =newTextPaint();
mEmptyMessagePaint.setColor(Themes.getAttrColor(context,android.R.attr.textColorPrimary));
mEmptyMessagePaint.setTextSize(getResources().getDimension(R.dimen.recents_empty_message_text_size));
mEmptyMessagePaint.setTypeface(Typeface.create(Themes.getDefaultBodyFont(context),Typeface.NORMAL));
mEmptyMessagePaint.setAntiAlias(true);
mEmptyMessagePadding =getResources().getDimensionPixelSize(R.dimen.recents_empty_message_text_padding);setWillNotDraw(false);updateEmptyMessage();
mOrientationHandler = mOrientationState.getOrientationHandler();
mTaskOverlayFactory =Overrides.getObject(TaskOverlayFactory.class,
context.getApplicationContext(),R.string.task_overlay_factory_class);// Initialize quickstep specific cache params here, as this is constructed only once
mActivity.getViewCache().setCacheSize(R.layout.digital_wellbeing_toast,5);
mTintingColor =getForegroundScrimDimColor(context);// if multi-instance feature is enabledif(FeatureFlags.ENABLE_MULTI_INSTANCE.get()){// invalidate the current list of tasks if filter changes with a fading in/out animation
mFilterState.setOnFilterUpdatedListener(()->{Animator animatorFade = mActivity.getStateManager().createStateElementAnimation(RecentsAtomicAnimationFactory.INDEX_RECENTS_FADE_ANIM,1f,0f);Animator animatorAppear = mActivity.getStateManager().createStateElementAnimation(RecentsAtomicAnimationFactory.INDEX_RECENTS_FADE_ANIM,0f,1f);
animatorFade.addListener(newAnimatorListenerAdapter(){@OverridepublicvoidonAnimationEnd(@NonNullAnimator animation){RecentsView.this.invalidateTaskList();updateClearAllFunction();reloadIfNeeded();if(mPendingAnimation !=null){
mPendingAnimation.addEndListener(success ->{
animatorAppear.start();});}else{
animatorAppear.start();}}});
animatorFade.start();});}// make sure filter is turned off by default
mFilterState.setFilterBy(null);}
当“清除所有”按钮被点击时，会调用 dismissAllTasks 方法来关闭所有任务。
通过创建任务视图池实例来加载布局。
task.xml
<!-- NOTE! don't add dimensions for margins / paddings / sizes that change per orientation to this
file, they need to be loaded at runtime. --><com.android.quickstep.views.TaskViewxmlns:android="http://schemas.android.com/apk/res/android"xmlns:androidprv="http://schemas.android.com/apk/prv/res/android"xmlns:launcher="http://schemas.android.com/apk/res-auto"android:layout_width="match_parent"android:layout_height="match_parent"android:clipChildren="false"android:defaultFocusHighlightEnabled="false"android:focusable="true"launcher:borderColor="?androidprv:attr/materialColorOutline"><com.android.quickstep.views.TaskThumbnailViewandroid:id="@+id/snapshot"android:layout_width="match_parent"android:layout_height="match_parent"/><!-- Filtering affects only alpha instead of the visibility since visibility can be altered
separately through RecentsView#resetFromSplitSelectionState() --><ImageViewandroid:id="@+id/show_windows"android:layout_height="@dimen/recents_filter_icon_size"android:layout_width="@dimen/recents_filter_icon_size"android:layout_gravity="end"android:alpha="0"android:tint="@color/recents_filter_icon"android:importantForAccessibility="no"android:src="@drawable/ic_select_windows"/><com.android.quickstep.views.IconViewandroid:id="@+id/icon"android:layout_width="@dimen/task_thumbnail_icon_size"android:layout_height="@dimen/task_thumbnail_icon_size"android:focusable="false"android:importantForAccessibility="no"/></com.android.quickstep.views.TaskView>
TaskView.java
protectedvoidsetIcon(IconView iconView,@NullableDrawable icon){if(icon !=null){
iconView.setDrawable(icon);
iconView.setOnClickListener(v ->{if(confirmSecondSplitSelectApp()){return;}showTaskMenu(iconView);});
iconView.setOnLongClickListener(v ->{requestDisallowInterceptTouchEvent(true);returnshowTaskMenu(iconView);});}else{
iconView.setDrawable(null);
iconView.setOnClickListener(null);
iconView.setOnLongClickListener(null);}}
F ---------->内容补充说明
在 Android 11 中，最近任务（
Recent Apps）的响应机制有所变化，它不再完全由 SystemUI 处理，而是部分集成到了
Launcher3 应用中。以下是 SystemUI 如何响应最近任务请求的概述：
初始化阶段：SystemUI 服务启动时，会初始化 Recents 组件。这通常涉及到 Recents.java 文件中的 Recents 类，它继承自 SystemUI。它实现了 CoreStartable 和 CommandQueue.Callbacks 接口。在 start() 方法中，会将 Recents 实例注册到 CommandQueue 中，并启动 RecentsImplementation 的实现类，如 OverviewProxyRecentsImpl。
处理用户交互：当用户通过手势或按键触发最近任务时，事件会传递到 PhoneWindowManager，然后调用 SystemUI 中的 Recents 组件的 toggleRecentApps() 方法。
OverviewProxyRecentsImpl：在 OverviewProxyRecentsImpl.java 中，toggleRecentApps() 方法会被调用。如果与 Launcher3 的服务连接成功，它会通过 OverviewProxyService 调用 Launcher3 中的 IOverviewProxy 接口的 onOverviewToggle() 方法。
Launcher3 中的 TouchInteractionService：在 Launcher3 应用中，TouchInteractionService.java 包含了 onOverviewToggle() 方法的实现。这个方法会触发最近任务界面的显示。
RecentsActivityCommand：最终，RecentsActivityCommand 会被执行，它负责启动 RecentsActivity，这是显示最近任务列表的界面。
显示最近任务：RecentsActivity 会显示最近任务列表，并且可能会涉及到 RecentsView 类，它负责显示任务的缩略图和提供用户交互。
在 Android 11 中，由于最近任务界面的实现部分被移动到了 Launcher3 应用中，因此如果替换了默认的 Launcher3，可能会导致最近任务功能失效。这是因为新的 Launcher 可能没有集成处理最近任务的逻辑。
OverviewProxyRecentsImpl.java 中的 toggleRecentApps 方法是处理最近任务（Recent Apps）切换的关键方法。当用户想要查看最近任务时，这个动作会被触发。
以下是 toggleRecentApps 方法的工作流程：
toggleRecentApps 方法首先会检查是否已经连接到了 Launcher3 的服务。如果是，它会将切换逻辑交给 Launcher3 处理。
如果连接到了 Launcher3 的服务，它会通过 OverviewProxyService 的 getProxy 方法获取到 IOverviewProxy 的实例。
然后，它会尝试调用 IOverviewProxy 实例的 onOverviewToggle 方法来切换最近任务的显示状态。
在 Launcher3 中，TouchInteractionService 会接收到这个切换请求，并调用 OverviewCommandHelper 的 onOverviewToggle 方法。
onOverviewToggle 方法会调用 ActivityManagerWrapper 的 closeSystemWindows 方法，传入 CLOSE_SYSTEM_WINDOWS_REASON_RECENTS 作为参数，这会导致所有前台的系统窗口关闭，为显示最近任务界面做准备。
最后，MAIN_EXECUTOR 会执行 RecentsActivityCommand，这是一个 Runnable 对象，负责启动 RecentsActivity，也就是最近任务的界面。
RecentsActivity 会设置视图并初始化 FallbackRecentsView，这是显示最近任务列表的主要视图。
当 RecentsView 附加到窗口时，它会注册任务堆栈变化的监听器，以便在任务发生变化时更新 UI。
TaskUtils.closeSystemWindowsAsync 是一个在 Android 系统中用于关闭系统窗口的异步方法。在 Android 11 版本中，最近任务（Recent Apps）的功能与 SystemUI 和 Launcher3 都有关联。当用户想要查看最近任务时，SystemUI 会通过 CommandQueue 的 showRecentApps 方法来触发这一动作。这个方法最终会调用到 IOverviewProxy 接口的 onOverviewShown 方法，而 Launcher3 中的 TouchInteractionService 服务的 TISBinder 对象实现了这个接口。
在 TISBinder 的 onOverviewShown 方法中，如果是因为用户按下最近任务键（通常是方块键）来触发的，那么会调用 TaskUtils.closeSystemWindowsAsync 方法来异步关闭系统窗口，并且传递一个原因参数 CLOSE_SYSTEM_WINDOWS_REASON_RECENTS。这样做是为了在显示最近任务视图之前，关闭其他所有前台活动窗口，确保用户界面的整洁和最近任务视图的突出显示。
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本文转载自: https://blog.csdn.net/qq_45696288/article/details/142456306
版权归原作者 爱睡觉的小馨 所有， 如有侵权，请联系我们删除。
版权归原作者 爱睡觉的小馨 所有， 如有侵权，请联系我们删除。