Android7.0 SystemUI StatusBar和Notification代碼淺析

* 程序入口 * 
系統會啓動SystemUIService 
SystemUIService->onCreate

SystemUIApplication->startServicesIfNeeded() 
建立全部SystemUI爲base的類的對象 
調用start() 
若是bootCompleted調用onBootCompleted 
好比 PhoneStatusBar的start和onBootCompleted

PhoneStatusBar -> BaseStatusBar -> SystemUI

繼承於SystemUI的類以下： 
extends SystemUI 
PhoneStatusBar 
KeyBoardUI 
KeyguardViewMediator 
RingtonePlayer 
PowerUI 
Recents 
ShortcutKeyDispatcher 
Divider 
BaseStatusBar 
SystemBars 
TunerService 
PipUI 
StorageNotification 
VolumeUI

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* view的建立過程 *

PhoneStatusBar 
->createAndAddWindows建立statusbar的視圖 
->addStatusBarWindow 建立StatusbarWindow並追加到WindowManager做爲系統的statusbar

StatusBarWindowView 
PhoneStatusbar的成員mStatusBarWindow 
其實就是super_status_bar.xml

PhoneStatusBarView extends PanelBar 
mStatusBarView PhoneStatusBar的成員 
對應status_bar.xml

NotificationPanelView 
PhoneStatusBar的成員mNotificationPanel 
StatusBarWindowView的成員mNotificationPanel 
其實就是status_bar_expanded.xml

status_bar_expanded.xml 
NotificationsQuickSettingsContainer 
NotificationPanelView的成員mNotificationContainerParent 
id = notification_container_parent，在status_bar_expanded.xml中

AutoReinflateContainer 
NotificationPanelView的成員mQsAutoReinflateContainer 
id = qs_auto_reinflate_container 
構造函數中 
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.AutoReinflateContainer); 
if (!a.hasValue(R.styleable.AutoReinflateContainer_android_layout)) { 
throw new IllegalArgumentException(「AutoReinflateContainer must contain a layout」); 
} 
mLayout = a.getResourceId(R.styleable.AutoReinflateContainer_android_layout, 0);

實際是經過attrs中 

去查找id爲qs_auto_reinflate_container的layout文件中的android:layout屬性對應的layout屬性的值 
android:layout=」@layout/qs_panel」

AutoReinflateContainer 
inflateLayout(); 
會回調全部的Listener 
一共有3個Listener 
PhoneStatusbar中一個 
NotificationPanelView中一個 
NotificationQuickSettingsContainer中一個

mQsAutoReinflateContainer.addInflateListener(new InflateListener() { 
@Override 
public void onInflated(View v) { 
mQsContainer = (QSContainer) v.findViewById(R.id.quick_settings_container); 
mQsContainer.setPanelView(NotificationPanelView.this); 
mQsContainer.getHeader().findViewById(R.id.expand_indicator) 
.setOnClickListener(NotificationPanelView.this);

            // recompute internal state when qspanel height changes
            mQsContainer.addOnLayoutChangeListener(new OnLayoutChangeListener() {
                @Override
                public void onLayoutChange(View v, int left, int top, int right, int bottom,
                        int oldLeft, int oldTop, int oldRight, int oldBottom) {
                    final int height = bottom - top;
                    final int oldHeight = oldBottom - oldTop;
                    if (height != oldHeight) {
                        onQsHeightChanged();
                    }
                }
            });
            mNotificationStackScroller.setQsContainer(mQsContainer);
        }
    });

所以AutoReinflateContainer其實內部就是android:layout=」@layout/qs_panel」 
也就是QSContainer，對應qs_panel.xml 
qs_panel.xml包含4部分 
quick_settings_panel ——>QSPanel quick setting打開狀態 
quick_status_bar_expanded_header ——>QuickStatusBarHeader quick setting收起的狀態，包含編輯btn，setting btn，時間等， 
最重要的是QuickQSPanel，表明quick setting收起狀態 
qs_detail ——>QSDetail quick setting中某一個setting相打開後的狀態， 
好比battery或者情景模式設定打開後的詳情狀態 
包含兩個btn，一個是more setting，一個是done 
點擊done返回QSPanel狀態 
點擊more setting進入對應的設定頁面

qs_customize ——>QSCustomizer quick setting detail編輯中的狀態

quick_status_bar_expanded_header 
QuickStatusBarHeader.java 
實際上是quick_status_bar_expanded_header.xml 
這裏面就包含了多個btn，切換用戶，進入setting，下拉打開quick setting詳細，編輯 
裏面包含 
mHeaderQsPanel = (QuickQSPanel) findViewById(R.id.quick_qs_panel); 
quick_qs_panel ——>QuickQSPanel

signal_cluster 
status_bar.xml->system_icons.xml->signal_cluster_view.xml->signal_cluster 
status_bar.xml是狀態欄

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* QSPanel隱藏過程 *

NotificationPanelView status_bar_expanded.xml id=notification_panel 
extends PanelView

PanelView ->mBar->PanelBar->panelExpansionChanged 
NotificationPanelView PhoneStatusBarView

PhoneStatusBarView->animateCollapsePanels-> 
mStatusBarView.collapsePanel(true /* animate */, delayed, speedUpFactor);

PanelBar的 
panelExpansionChanged 
經過PanelView的notifyBarPanelExpansionChanged調用的 
這裏使得最初顯示了QuickQSPanel，隱藏了QSPanel

啓動時經過BaseStatusBar->start()->createAndAddWindows()建立statusbar的view 
以後經過disable 
disable(switches[0], switches[6], false /* animate */); 
調用PhoneStatusBar的 
disable

12-07 15:38:45.695 1389-1389/com.android.systemui D/PhoneStatusBar: disable: < EXPAND* icons alerts system_info BACK* HOME* RECENT* clock SEARCH* quick_settings > 
if ((diff1 & StatusBarManager.DISABLE_EXPAND) != 0) { 
if ((state1 & StatusBarManager.DISABLE_EXPAND) != 0) { 
animateCollapsePanels(); 
} 
}

以後就會調用animateCollapsePanels(); 
animateCollapsePanels(flags, false /* force /, false / delayed */, 
1.0f /* speedUpFactor */); 
mStatusBarView.collapsePanel(true /* animate */, delayed, speedUpFactor); 
mStatusBarView是PhoneStatusBarView， 
PhoneStatusBarView extends PanelBar

collapsePanel在PanelBar中->PhoneStatusBarView 
public void collapsePanel(boolean animate, boolean delayed, float speedUpFactor) { 
true，false，1.0

panelView->NotificationPanelView 
fling(0, false /* expand /, speedUpFactor, false / expandBecauseOfFalsing */); 
fling(0, false, 1.0, false);

flingToHeight(vel, expand, target, collapseSpeedUpFactor, expandBecauseOfFalsing); 
flingToHeight(0, false, 0.0f, 1.0, false);

@Override 
public void onAnimationEnd(Animator animation) { 
if (clearAllExpandHack && !mCancelled) { 
setExpandedHeightInternal(getMaxPanelHeight()); 
} 
mHeightAnimator = null; 
if (!mCancelled) { 
notifyExpandingFinished(); 
} 
notifyBarPanelExpansionChanged(); 
}

panelView->notifyBarPanelExpansionChanged(); 
mBar.panelExpansionChanged(mExpandedFraction, mExpandedFraction > 0f || mPeekPending 
|| mPeekAnimator != null || mInstantExpanding || isPanelVisibleBecauseOfHeadsUp() 
|| mTracking || mHeightAnimator != null);

panelBar->panelExpansionChanged(float frac, boolean expanded) { 
12-07 15:38:45.695 1389-1389/com.android.systemui V/PanelBar: panelExpansionChanged: start state=0, frac=0.0, expanded=false 
12-07 15:38:45.695 1389-1389/com.android.systemui V/PanelBar: panelExpansionChanged: end state=0 [ fullyClosed ] 
PanelView pv = mPanel; 
pv.setVisibility(expanded ? View.VISIBLE : View.INVISIBLE);

public class NotificationPanelView extends PanelView 
NotificationPanelView -> status_bar_expanded.xml裏面包含QSPanel 
這裏就將QSPanel隱藏掉了

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清空全部Notification在 
status_bar_notification_dismiss_all.xml中

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tiles每一個tils對應一個quick setting icon 
config.xml 

wifi,cell,battery,dnd,flashlight,rotation,bt,airplane,location,hotspot,inversion,saver,work,cast,night 
QSTile.java 
經過QSTileHost.createTile建立一個tile 
TileQueryHelper.java構造函數->addSystemTiles建立全部Tile

構造函數是在QuickStatusBarHeader的onFinishInflate函數中調用的

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quick_settings_panel ——>QSPanel 
裏面包含qs_paged_tile_layout ——>QSTileLayout 
裏面的每一個item是QSTileView，包含icon和label，點擊能夠顯示詳情

QuickQSPanel 
裏面的每一個item是QSTileBaseView，只有icon，點擊不能顯示詳情

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Notification畫面結構

NotificationContentView 
ExpandableNotificationRow ——————————–一行能夠擴展的Notification，包含NotificationChildrenContainer， 
NotificationGuts，NotificationSettingsIconRow 
在BaseStatusBar的inflateViews建立並賦值給Entry的row變量記錄下來 
NotificationChildrenContainer ——————————–包含NotificationHeaderView和Divider 
NotificationHeaderView ——————————–包含Notification合併後的header，app icon，name，下拉btn 
HybridNotificationView ——————————–ExpandableNotificationRow的兩個成員變量mPrivateLayout和mPublicLayout對應的類 
當多條收縮在一塊兒的Notification中的一行收縮顯示時使用這個View 
NotificationGuts ——–notification_guts——-一條Notification的設定條目 包含icon title summary 
設定相關radio btn，以及設定打開後的more setting和done btn 
NotificationSettingsIconRow ——–notification_guts——-彷佛是左右拖動Notification後顯示出的Setting btn

HeadsUpEntry ——————————–從Android 5.0開始，若是notification priority設置爲HIGH, MAX, 或者fullscreenIntent不爲空，在非鎖屏界面收到notification時屏幕上方會顯示一個小懸浮窗口提醒用戶，方便用戶在不退出當前瀏覽界面的前提下快速響應該notification，即Heads-Up Notification(簡稱HUN)。

NotificationViewWrapper implements TransformableView 
用於處理view動畫，好比fadeIn fadeOut

BaseStatusBar的inflateViews 
row = (ExpandableNotificationRow) inflater.inflate(R.layout.status_bar_notification_row, 
parent, false);

ExpandableNotificationRow extends ActivatableNotificationView 
ActivatableNotificationView extends ExpandableOutlineView 
ExpandableOutlineView extends ExpandableView 
ExpandableView extends FrameLayout 
因此ExpandableNotificationRow根本上是個FrameLayout

Notification.Builder生成的Notification沒有使用其餘content layout，沒有使用其餘style的話 
那麼直接從Notification.Builder建立View

            cachedContentView = builder.createContentView();
            cachedBigContentView = builder.createBigContentView();
            cachedHeadsUpContentView = builder.createHeadsUpContentView();
            cachedPublicContentView = builder.makePublicContentView();

實際處理在Notification.java中 
frameworks/base/core/java/android/app/Notification.java

主要用到的Layout文件 
frameworks/base/core/res/res/layout/notification_template_material_base.xml 
frameworks/base/core/res/res/layout/notification_template_right_icon.xml 
frameworks/base/core/res/res/layout/notification_template_text.xml 
frameworks/base/core/res/res/layout/notification_template_part_line1.xml 
frameworks/base/core/res/res/layout/notification_template_header.xml 
frameworks/base/core/res/res/layout/notification_template_material_big_base.xml

裏面用到一些文字的style 
在 
frameworks/base/core/res/res/values/styles_material.xml 

@color/white 
@dimen/notification_text_size 
<style name="TextAppearance.Material.Notification.Reply" />

<style name="TextAppearance.Material.Notification.Title">
    <item name="textColor">@color/white</item>
    <item name="textSize">@dimen/notification_title_text_size</item>
</style>

<style name="TextAppearance.Material.Notification.Line2">
    <item name="textSize">@dimen/notification_subtext_size</item>
</style>

<style name="TextAppearance.Material.Notification.Info">
    <item name="textColor">@color/white</item>
    <item name="textSize">@dimen/notification_subtext_size</item>
</style>

<style name="TextAppearance.Material.Notification.Time" parent="TextAppearance.Material.Notification.Info" />

<style name="TextAppearance.Material.Notification.Emphasis">
    <item name="textColor">#66000000</item>
</style>

<style name="Widget.Material.Notification.ProgressBar" parent="Widget.Material.Light.ProgressBar.Horizontal" />

<style name="Widget.Material.Notification.MessagingText" parent="Widget.Material.Light.TextView">
    <item name="layout_width">match_parent</item>
    <item name="layout_height">wrap_content</item>
    <item name="ellipsize">end</item>
    <item name="visibility">gone</item>
    <item name="textAppearance">@style/TextAppearance.Material.Notification</item>
</style>
 
Notification來源

BaseStatusBar.java 
start時經過 
mNotificationListener.registerAsSystemService(mContext, 
new ComponentName(mContext.getPackageName(), getClass().getCanonicalName()), 
UserHandle.USER_ALL); 
註冊listener

private final NotificationListenerService mNotificationListener = 
new NotificationListenerService() { 
@Override 
public void onNotificationPosted(final StatusBarNotification sbn, 
final RankingMap rankingMap) { 
來接收新的Notification

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setSystemUiVisibility 
View.STATUS_BAR_TRANSIENT————0x04000000 
View.STATUS_BAR_TRANSLUCENT———-0x40000000 
View.STATUS_BAR_TRANSPARENT———-0x0000008

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