根据字符"登录到WLAN网络" 查找到对应的字符串
<string name="wifi_available_sign_in" msgid="9157196203958866662">"登录到WLAN网络"</string>
进而查找该字符在代码中的使用：
frameworks/base/services/core/java/com/android/server/connectivity/NetworkNotificationManager.java
其对应的函数是：
public void showNotification(int id, NotificationType notifyType, NetworkAgentInfo nai,
NetworkAgentInfo switchToNai, PendingIntent intent, boolean highPriority) {
final String tag = tagFor(id);
final int eventId = notifyType.eventId;
final int transportType;
final String name;
if (nai != null) {
transportType = getFirstTransportType(nai);
final String extraInfo = nai.networkInfo.getExtraInfo();
name = TextUtils.isEmpty(extraInfo) ? nai.networkCapabilities.getSSID() : extraInfo;
// Only notify for Internet-capable networks.
if (!nai.networkCapabilities.hasCapability(NET_CAPABILITY_INTERNET)) return;
} else {
// Legacy notifications.
transportType = TRANSPORT_CELLULAR;
name = null;
}
// Clear any previous notification with lower priority, otherwise return. http://b/63676954.
// A new SIGN_IN notification with a new intent should override any existing one.
final int previousEventId = mNotificationTypeMap.get(id);
final NotificationType previousNotifyType = NotificationType.getFromId(previousEventId);
if (priority(previousNotifyType) > priority(notifyType)) {
Slog.d(TAG, String.format(
"ignoring notification %s for network %s with existing notification %s",
notifyType, id, previousNotifyType));
return;
}
clearNotification(id);
if (DBG) {
Slog.d(TAG, String.format(
"showNotification tag=%s event=%s transport=%s name=%s highPriority=%s",
tag, nameOf(eventId), getTransportName(transportType), name, highPriority));
}
Resources r = Resources.getSystem();
CharSequence title;
CharSequence details;
int icon = getIcon(transportType);
if (notifyType == NotificationType.NO_INTERNET && transportType == TRANSPORT_WIFI) {
title = r.getString(R.string.wifi_no_internet, 0);
details = r.getString(R.string.wifi_no_internet_detailed);
} else if (notifyType == NotificationType.LOST_INTERNET &&
transportType == TRANSPORT_WIFI) {
title = r.getString(R.string.wifi_no_internet, 0);
details = r.getString(R.string.wifi_no_internet_detailed);
} else if (notifyType == NotificationType.SIGN_IN) {
switch (transportType) {
case TRANSPORT_WIFI:
title = r.getString(R.string.wifi_available_sign_in, 0);
details = r.getString(R.string.network_available_sign_in_detailed,
WifiInfo.removeDoubleQuotes(nai.networkCapabilities.getSSID()));
break;
case TRANSPORT_CELLULAR:
title = r.getString(R.string.network_available_sign_in, 0);
// TODO: Change this to pull from NetworkInfo once a printable
// name has been added to it
details = mTelephonyManager.getNetworkOperatorName(
SubscriptionManager.getDefaultDataSubscriptionId());
break;
default:
title = r.getString(R.string.network_available_sign_in, 0);
details = r.getString(R.string.network_available_sign_in_detailed, name);
break;
}
} else if (notifyType == NotificationType.NETWORK_SWITCH) {
String fromTransport = getTransportName(transportType);
String toTransport = getTransportName(getFirstTransportType(switchToNai));
title = r.getString(R.string.network_switch_metered, toTransport);
details = r.getString(R.string.network_switch_metered_detail, toTransport,
fromTransport);
} else {
Slog.wtf(TAG, "Unknown notification type " + notifyType + " on network transport "
+ getTransportName(transportType));
return;
}
final String channelId = highPriority ? SystemNotificationChannels.NETWORK_ALERTS :
SystemNotificationChannels.NETWORK_STATUS;
Notification.Builder builder = new Notification.Builder(mContext, channelId)
.setWhen(System.currentTimeMillis())
.setShowWhen(notifyType == NotificationType.NETWORK_SWITCH)
.setSmallIcon(icon)
.setAutoCancel(true)
.setTicker(title)
.setColor(mContext.getColor(
com.android.internal.R.color.system_notification_accent_color))
.setContentTitle(title)
.setContentIntent(intent)
.setLocalOnly(true)
.setOnlyAlertOnce(true);
if (notifyType == NotificationType.NETWORK_SWITCH) {
builder.setStyle(new Notification.BigTextStyle().bigText(details));
} else {
builder.setContentText(details);
}
if (notifyType == NotificationType.SIGN_IN) {
builder.extend(new Notification.TvExtender().setChannelId(channelId));
}
Notification notification = builder.build();
mNotificationTypeMap.put(id, eventId);
try {
mNotificationManager.notifyAsUser(tag, eventId, notification, UserHandle.ALL);
} catch (NullPointerException npe) {
Slog.d(TAG, "setNotificationVisible: visible notificationManager error", npe);
}
}
以上文件中主要需要查看的就是Notification的调用过程，仔细查看其参数列表；
重点需要查看的代码是：
final String channelId = highPriority ? SystemNotificationChannels.NETWORK_ALERTS :
SystemNotificationChannels.NETWORK_STATUS;
Notification.Builder builder = new Notification.Builder(mContext, channelId)
.setWhen(System.currentTimeMillis())
.setShowWhen(notifyType == NotificationType.NETWORK_SWITCH)
.setSmallIcon(icon)
.setAutoCancel(true)
.setTicker(title)
.setColor(mContext.getColor(
com.android.internal.R.color.system_notification_accent_color))
.setContentTitle(title)
.setContentIntent(intent)
.setLocalOnly(true)
.setOnlyAlertOnce(true);
网络的优先级是：highPriority ? SystemNotificationChannels.NETWORK_ALERTS : SystemNotificationChannels.NETWORK_STATUS;
响铃的次数是：setOnlyAlertOnce(true);
具体的响铃主要是以下实现：
try {
mNotificationManager.notifyAsUser(tag, eventId, notification, UserHandle.ALL);
} catch (NullPointerException npe) {
Slog.d(TAG, "setNotificationVisible: visible notificationManager error", npe);
}
frameworks/base/core/java/android/app/NotificationManager.java
/**
* @hide
*/
public void notifyAsUser(String tag, int id, Notification notification, UserHandle user)
{
INotificationManager service = getService();
String pkg = mContext.getPackageName();
// Fix the notification as best we can.
Notification.addFieldsFromContext(mContext, notification);
if (notification.sound != null) {
notification.sound = notification.sound.getCanonicalUri();
if (StrictMode.vmFileUriExposureEnabled()) {
notification.sound.checkFileUriExposed("Notification.sound");
}
}
fixLegacySmallIcon(notification, pkg);
if (mContext.getApplicationInfo().targetSdkVersion > Build.VERSION_CODES.LOLLIPOP_MR1) {
if (notification.getSmallIcon() == null) {
throw new IllegalArgumentException("Invalid notification (no valid small icon): "
+ notification);
}
}
if (localLOGV) Log.v(TAG, pkg + ": notify(" + id + ", " + notification + ")");
notification.reduceImageSizes(mContext);
ActivityManager am = (ActivityManager) mContext.getSystemService(Context.ACTIVITY_SERVICE);
boolean isLowRam = am.isLowRamDevice();
final Notification copy = Builder.maybeCloneStrippedForDelivery(notification, isLowRam,
mContext);
try {
service.enqueueNotificationWithTag(pkg, mContext.getOpPackageName(), tag, id,
copy, user.getIdentifier());
} catch (RemoteException e) {
throw e.rethrowFromSystemServer();
}
}
从INotificationManager service = getService()；查看具体Service对象；
/** @hide */
static public INotificationManager getService()
{
if (sService != null) {
return sService;
}
IBinder b = ServiceManager.getService("notification");
sService = INotificationManager.Stub.asInterface(b);
return sService;
}
此处是直接获取到notification的Service服务的；对应的文件是：
frameworks/base/services/core/java/com/android/server/notification/NotificationManagerService.java
@Override
public void enqueueNotificationWithTag(String pkg, String opPkg, String tag, int id,
Notification notification, int userId) throws RemoteException {
enqueueNotificationInternal(pkg, opPkg, Binder.getCallingUid(),
Binder.getCallingPid(), tag, id, notification, userId);
}
然后找到enqueueNotificationInternal函数的实现处：
void enqueueNotificationInternal(final String pkg, final String opPkg, final int callingUid,
final int callingPid, final String tag, final int id, final Notification notification,
int incomingUserId) {
if (DBG) {
Slog.v(TAG, "enqueueNotificationInternal: pkg=" + pkg + " id=" + id
+ " notification=" + notification);
}
checkCallerIsSystemOrSameApp(pkg);
final int userId = ActivityManager.handleIncomingUser(callingPid,
callingUid, incomingUserId, true, false, "enqueueNotification", pkg);
final UserHandle user = new UserHandle(userId);
if (pkg == null || notification == null) {
throw new IllegalArgumentException("null not allowed: pkg=" + pkg
+ " id=" + id + " notification=" + notification);
}
// The system can post notifications for any package, let us resolve that.
final int notificationUid = resolveNotificationUid(opPkg, callingUid, userId);
// Fix the notification as best we can.
try {
final ApplicationInfo ai = mPackageManagerClient.getApplicationInfoAsUser(
pkg, PackageManager.MATCH_DEBUG_TRIAGED_MISSING,
(userId == UserHandle.USER_ALL) ? USER_SYSTEM : userId);
Notification.addFieldsFromContext(ai, notification);
int canColorize = mPackageManagerClient.checkPermission(
android.Manifest.permission.USE_COLORIZED_NOTIFICATIONS, pkg);
if (canColorize == PERMISSION_GRANTED) {
notification.flags |= Notification.FLAG_CAN_COLORIZE;
} else {
notification.flags &= ~Notification.FLAG_CAN_COLORIZE;
}
} catch (NameNotFoundException e) {
Slog.e(TAG, "Cannot create a context for sending app", e);
return;
}
mUsageStats.registerEnqueuedByApp(pkg);
// setup local book-keeping
String channelId = notification.getChannelId();
if (mIsTelevision && (new Notification.TvExtender(notification)).getChannelId() != null) {
channelId = (new Notification.TvExtender(notification)).getChannelId();
}
final NotificationChannel channel = mRankingHelper.getNotificationChannel(pkg,
notificationUid, channelId, false /* includeDeleted */);
if (channel == null) {
final String noChannelStr = "No Channel found for "
+ "pkg=" + pkg
+ ", channelId=" + channelId
+ ", id=" + id
+ ", tag=" + tag
+ ", opPkg=" + opPkg
+ ", callingUid=" + callingUid
+ ", userId=" + userId
+ ", incomingUserId=" + incomingUserId
+ ", notificationUid=" + notificationUid
+ ", notification=" + notification;
Log.e(TAG, noChannelStr);
boolean appNotificationsOff = mRankingHelper.getImportance(pkg, notificationUid)
== NotificationManager.IMPORTANCE_NONE;
if (!appNotificationsOff) {
doChannelWarningToast("Developer warning for package \"" + pkg + "\"\n" +
"Failed to post notification on channel \"" + channelId + "\"\n" +
"See log for more details");
}
return;
}
final StatusBarNotification n = new StatusBarNotification(
pkg, opPkg, id, tag, notificationUid, callingPid, notification,
user, null, System.currentTimeMillis());
final NotificationRecord r = new NotificationRecord(getContext(), n, channel);
r.setIsAppImportanceLocked(mRankingHelper.getIsAppImportanceLocked(pkg, callingUid));
if ((notification.flags & Notification.FLAG_FOREGROUND_SERVICE) != 0) {
final boolean fgServiceShown = channel.isFgServiceShown();
if (((channel.getUserLockedFields() & NotificationChannel.USER_LOCKED_IMPORTANCE) == 0
|| !fgServiceShown)
&& (r.getImportance() == IMPORTANCE_MIN
|| r.getImportance() == IMPORTANCE_NONE)) {
// Increase the importance of foreground service notifications unless the user had
// an opinion otherwise (and the channel hasn't yet shown a fg service).
if (TextUtils.isEmpty(channelId)
|| NotificationChannel.DEFAULT_CHANNEL_ID.equals(channelId)) {
r.setImportance(IMPORTANCE_LOW, "Bumped for foreground service");
} else {
channel.setImportance(IMPORTANCE_LOW);
if (!fgServiceShown) {
channel.unlockFields(NotificationChannel.USER_LOCKED_IMPORTANCE);
channel.setFgServiceShown(true);
}
mRankingHelper.updateNotificationChannel(pkg, notificationUid, channel, false);
r.updateNotificationChannel(channel);
}
} else if (!fgServiceShown && !TextUtils.isEmpty(channelId)
&& !NotificationChannel.DEFAULT_CHANNEL_ID.equals(channelId)) {
channel.setFgServiceShown(true);
r.updateNotificationChannel(channel);
}
}
if (!checkDisqualifyingFeatures(userId, notificationUid, id, tag, r,
r.sbn.getOverrideGroupKey() != null)) {
return;
}
// Whitelist pending intents.
if (notification.allPendingIntents != null) {
final int intentCount = notification.allPendingIntents.size();
if (intentCount > 0) {
final ActivityManagerInternal am = LocalServices
.getService(ActivityManagerInternal.class);
final long duration = LocalServices.getService(
DeviceIdleController.LocalService.class).getNotificationWhitelistDuration();
for (int i = 0; i < intentCount; i++) {
PendingIntent pendingIntent = notification.allPendingIntents.valueAt(i);
if (pendingIntent != null) {
am.setPendingIntentWhitelistDuration(pendingIntent.getTarget(),
WHITELIST_TOKEN, duration);
}
}
}
}
mHandler.post(new EnqueueNotificationRunnable(userId, r));
}
后续的代码继续往下查看即可…