代码流程

1、先看UI显示,StatuBar加载 CollapsedStatusBarFragment 替换 status_bar_container(状态栏通知显示区域)

SystemUI\src\com\android\systemui\statusbar\phone\StatusBar.java

FragmentHostManager.get(mStatusBarWindow)
.addTagListener(CollapsedStatusBarFragment.TAG, (tag, fragment) -> {
CollapsedStatusBarFragment statusBarFragment =
(CollapsedStatusBarFragment) fragment;
statusBarFragment.initNotificationIconArea(mNotificationIconAreaController);
mStatusBarView = (PhoneStatusBarView) fragment.getView();
mStatusBarView.setBar(this);
mStatusBarView.setPanel(mNotificationPanel);
mStatusBarView.setScrimController(mScrimController);
mStatusBarView.setBouncerShowing(mBouncerShowing);
setAreThereNotifications();
checkBarModes();
/// M: add for plmn display feature @{
attachPlmnPlugin();
///@}
}).getFragmentManager()
.beginTransaction()
.replace(R.id.status_bar_container, new CollapsedStatusBarFragment(),
CollapsedStatusBarFragment.TAG)
.commit();

statusBarFragment.initNotificationIconArea(mNotificationIconAreaController) 初始化通知栏区域,这是我们关心的

mStatusBarView.setBar(this) 传递statusBar处理下拉事件

mStatusBarView.setPanel(mNotificationPanel) 传递 NotificationPanelView 显示下拉UI控制

2、跟进 CollapsedStatusBarFragment 中,先看布局文件 status_bar.xml

1、notification_lights_out---ImageView默认gone

2、status_bar_contents--LinearLayout

	notification_icon_area--FrameLayout

	system_icon_area--LinearLayout

			system_icons.xml(蓝牙、wifi、VPN、网卡、SIM卡信号、飞行模式等) 电池

			clock--Clock.java 

3、emergency_cryptkeeper_text--ViewStub(延迟加载 紧急电话文字)

这就是我们看到的statusBar的布局,本篇只关心 notification_icon_area,其它的以后再进行分析。继续看到之前的 initNotificationIconArea()

SystemUI\src\com\android\systemui\statusbar\phone\CollapsedStatusBarFragment.java

public void initNotificationIconArea(NotificationIconAreaController
notificationIconAreaController) {
ViewGroup notificationIconArea = mStatusBar.findViewById(R.id.notification_icon_area);
mNotificationIconAreaInner =
notificationIconAreaController.getNotificationInnerAreaView();
if (mNotificationIconAreaInner.getParent() != null) {
((ViewGroup) mNotificationIconAreaInner.getParent())
.removeView(mNotificationIconAreaInner);
}
notificationIconArea.addView(mNotificationIconAreaInner);
// Default to showing until we know otherwise.
showNotificationIconArea(false);
}

获取到 notification_icon_area,FrameLayout转为ViewGroup,调用 notificationIconAreaController 获取通知要显示的view(LinearLayout),

如果已经有显示的view,通过 view 父布局将其自身remove,然后再重新addView。最后将 mNotificationIconAreaInner 显示出来(设置透明度为1,visibility为VISIBLE)

可以看到 CollapsedStatusBarFragment 中定义了几个如下的方法。

 public void hideSystemIconArea(boolean animate) {
animateHide(mSystemIconArea, animate);
} public void showSystemIconArea(boolean animate) {
animateShow(mSystemIconArea, animate);
} public void hideNotificationIconArea(boolean animate) {
animateHide(mNotificationIconAreaInner, animate);
} public void showNotificationIconArea(boolean animate) {
animateShow(mNotificationIconAreaInner, animate);
}

当状态栏下拉时,状态栏中的图标icon会慢慢的变成透明和不可见,就是通过hideSystemIconArea(true), hideNotificationIconArea(true)

3、接下来,我们需要跟进 getNotificationInnerAreaView()方法中看看通知栏icon对应的容器

SystemUI\src\com\android\systemui\statusbar\phone\NotificationIconAreaController.java

public View getNotificationInnerAreaView() {
return mNotificationIconArea;
} protected void initializeNotificationAreaViews(Context context) {
reloadDimens(context); LayoutInflater layoutInflater = LayoutInflater.from(context);
mNotificationIconArea = inflateIconArea(layoutInflater);
mNotificationIcons = (NotificationIconContainer) mNotificationIconArea.findViewById(
R.id.notificationIcons); mNotificationScrollLayout = mStatusBar.getNotificationScrollLayout();
} protected View inflateIconArea(LayoutInflater inflater) {
return inflater.inflate(R.layout.notification_icon_area, null);
} //notification_icon_area.xml
<com.android.keyguard.AlphaOptimizedLinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/notification_icon_area_inner"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<com.android.systemui.statusbar.phone.NotificationIconContainer
android:id="@+id/notificationIcons"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentStart="true"
android:gravity="center_vertical"
android:orientation="horizontal"/>
</com.android.keyguard.AlphaOptimizedLinearLayout>

好了,观察上面的代码,现在基本上已经理清 notification_icon_area 的布局结构了

notification_icon_area(FrameLayout) 中添加 notification_icon_area_inner(LinearLayout),

每一个通知对应的bean为 NotificationData,创建 Notification 添加到 NotificationIconContainer(FrameLayout)中

4、紧接着我们就来看下 Notification 的监听加载流程,回到 statusBar 的start()中注册 NotificationListenerWithPlugins 作为系统service监听通知消息

try {
mNotificationListener.registerAsSystemService(mContext,
new ComponentName(mContext.getPackageName(), getClass().getCanonicalName()),
UserHandle.USER_ALL);
} catch (RemoteException e) {
Log.e(TAG, "Unable to register notification listener", e); } private final NotificationListenerWithPlugins mNotificationListener =
new NotificationListenerWithPlugins() {
@Override
public void onListenerConnected() {
...... services成功启动,获取当前处于活动状态的通知(没被移除的通知),添加到通知栏,此处应该是重启后重新加载
} @Override
public void onNotificationPosted(final StatusBarNotification sbn,
final RankingMap rankingMap) {
...... 收到通知消息,添加或者修改
if (isUpdate) {
updateNotification(sbn, rankingMap);
} else {
addNotification(sbn, rankingMap);
}
} @Override
public void onNotificationRemoved(StatusBarNotification sbn,
final RankingMap rankingMap) {
...... 移除通知消息
if (sbn != null && !onPluginNotificationRemoved(sbn, rankingMap)) {
final String key = sbn.getKey();
mHandler.post(() -> removeNotification(key, rankingMap));
}
} @Override
public void onNotificationRankingUpdate(final RankingMap rankingMap) {
..... 通知的排序优先级改变,修改通知位置
if (rankingMap != null) {
RankingMap r = onPluginRankingUpdate(rankingMap);
mHandler.post(() -> updateNotificationRanking(r));
}
} };

继续来看下 addNotification()方法

public void addNotification(StatusBarNotification notification, RankingMap ranking)
throws InflationException {
String key = notification.getKey();
if (true/**DEBUG*/) Log.d(TAG, "addNotification key=" + key);
mNotificationData.updateRanking(ranking);
Entry shadeEntry = createNotificationViews(notification);
......
}

可以看到是通过 createNotificationViews()来创建通知 View对象,内部继续调用 inflateViews()

protected NotificationData.Entry createNotificationViews(StatusBarNotification sbn)
throws InflationException {
if (DEBUG) {
Log.d(TAG, "createNotificationViews(notification=" + sbn);
}
NotificationData.Entry entry = new NotificationData.Entry(sbn);
Dependency.get(LeakDetector.class).trackInstance(entry);
entry.createIcons(mContext, sbn);
// Construct the expanded view.
inflateViews(entry, mStackScroller);
return entry;
} protected void inflateViews(Entry entry, ViewGroup parent) {
PackageManager pmUser = getPackageManagerForUser(mContext,
entry.notification.getUser().getIdentifier()); final StatusBarNotification sbn = entry.notification;
if (entry.row != null) {
entry.reset();
updateNotification(entry, pmUser, sbn, entry.row);
} else {
new RowInflaterTask().inflate(mContext, parent, entry,
row -> {
bindRow(entry, pmUser, sbn, row);
updateNotification(entry, pmUser, sbn, row);
});
} }

看到上面的方法中,entry在 createNotificationViews 中创建,只赋值了icons, entry.row 为null,进入 RowInflaterTask 中

SystemUI\src\com\android\systemui\statusbar\notification\RowInflaterTask.java

public void inflate(Context context, ViewGroup parent, NotificationData.Entry entry,
RowInflationFinishedListener listener) {
mListener = listener;
AsyncLayoutInflater inflater = new AsyncLayoutInflater(context);
mEntry = entry;
entry.setInflationTask(this);
inflater.inflate(R.layout.status_bar_notification_row, parent, this);
}

这里我们得到了 Notification 对应的layout为 status_bar_notification_row.xml

回调方法中将 row 和 entry 绑定,继续再调用 updateNotification(),注意这个方法是四个参数的,该类中还有重载方法是两个参数的。

private void updateNotification(Entry entry, PackageManager pmUser,
StatusBarNotification sbn, ExpandableNotificationRow row) {
..... entry.row = row;
entry.row.setOnActivatedListener(this); boolean useIncreasedCollapsedHeight = mMessagingUtil.isImportantMessaging(sbn,
mNotificationData.getImportance(sbn.getKey()));
boolean useIncreasedHeadsUp = useIncreasedCollapsedHeight && mPanelExpanded;
row.setUseIncreasedCollapsedHeight(useIncreasedCollapsedHeight);
row.setUseIncreasedHeadsUpHeight(useIncreasedHeadsUp);
row.updateNotification(entry);
}

紧接着调用了 ExpandableNotificationRow的 updateNotification(),内部继续调用 NotificationInflater.inflateNotificationViews()

SystemUI\src\com\android\systemui\statusbar\notification\NotificationInflater.java

@VisibleForTesting
void inflateNotificationViews(int reInflateFlags) {
if (mRow.isRemoved()) {
// We don't want to reinflate anything for removed notifications. Otherwise views might
// be readded to the stack, leading to leaks. This may happen with low-priority groups
// where the removal of already removed children can lead to a reinflation.
return;
}
StatusBarNotification sbn = mRow.getEntry().notification;
new AsyncInflationTask(sbn, reInflateFlags, mRow, mIsLowPriority,
mIsChildInGroup, mUsesIncreasedHeight, mUsesIncreasedHeadsUpHeight, mRedactAmbient,
mCallback, mRemoteViewClickHandler).execute();
}

new AsyncInflationTask().execute();

@Override
protected InflationProgress doInBackground(Void... params) {
try {
final Notification.Builder recoveredBuilder
= Notification.Builder.recoverBuilder(mContext,
mSbn.getNotification());
Context packageContext = mSbn.getPackageContext(mContext);
Notification notification = mSbn.getNotification();
if (mIsLowPriority) {
int backgroundColor = mContext.getColor(
R.color.notification_material_background_low_priority_color);
recoveredBuilder.setBackgroundColorHint(backgroundColor);
}
if (notification.isMediaNotification()) {
MediaNotificationProcessor processor = new MediaNotificationProcessor(mContext,
packageContext);
processor.setIsLowPriority(mIsLowPriority);
processor.processNotification(notification, recoveredBuilder);
}
return createRemoteViews(mReInflateFlags,
recoveredBuilder, mIsLowPriority, mIsChildInGroup,
mUsesIncreasedHeight, mUsesIncreasedHeadsUpHeight, mRedactAmbient,
packageContext);
} catch (Exception e) {
mError = e;
return null;
}
} @Override
protected void onPostExecute(InflationProgress result) {
if (mError == null) {
mCancellationSignal = apply(result, mReInflateFlags, mRow, mRedactAmbient,
mRemoteViewClickHandler, this);
} else {
handleError(mError);
}
}

从msbn中获取 notifaction,判断是否是媒体类型的通知,进行对应的主题背景色修改,通过传递的优先级设置通知背景色,继续看核心方法 createRemoteViews()

private static InflationProgress createRemoteViews(int reInflateFlags,
Notification.Builder builder, boolean isLowPriority, boolean isChildInGroup,
boolean usesIncreasedHeight, boolean usesIncreasedHeadsUpHeight, boolean redactAmbient,
Context packageContext) {
InflationProgress result = new InflationProgress();
isLowPriority = isLowPriority && !isChildInGroup;
if ((reInflateFlags & FLAG_REINFLATE_CONTENT_VIEW) != 0) {
result.newContentView = createContentView(builder, isLowPriority, usesIncreasedHeight);
} if ((reInflateFlags & FLAG_REINFLATE_EXPANDED_VIEW) != 0) {
result.newExpandedView = createExpandedView(builder, isLowPriority);
} if ((reInflateFlags & FLAG_REINFLATE_HEADS_UP_VIEW) != 0) {
result.newHeadsUpView = builder.createHeadsUpContentView(usesIncreasedHeadsUpHeight);
} if ((reInflateFlags & FLAG_REINFLATE_PUBLIC_VIEW) != 0) {
result.newPublicView = builder.makePublicContentView();
} if ((reInflateFlags & FLAG_REINFLATE_AMBIENT_VIEW) != 0) {
result.newAmbientView = redactAmbient ? builder.makePublicAmbientNotification()
: builder.makeAmbientNotification();
}
result.packageContext = packageContext;
return result;
}

这里就是创建各种布局 CONTENT_VIEW、EXPANDED_VIEW、HEADS_UP_VIEW、PUBLIC_VIEW、AMBIENT_VIEW,

然后回到 AsyncInflationTask 的 onPostExecute()中执行 apply(),代码太多就不贴了, SystemUI部分的通知流程分析技术,欢迎留言讨论。

statusBar左边区域(notification_icon_area)看完了,接下来看下右边的系统图标区域(system_icon_area)

Android8.1 SystemUI源码分析之 电池时钟刷新

从根源上屏蔽Notification

frameworks/base/services/core/java/com/android/server/notification/NotificationManagerService.java

注释如下代码

mHandler.post(new EnqueueNotificationRunnable(userId, r))

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