android源码浅析--notification
16lz
2022-03-10
在上一篇文章中，用到了Notification，准备好好的看下notification的源码。
类概述：
一个表示如何使用NotificationManager把一个持久的通知呈现给用户的类。
TheNotification.Builderhas been added to make it easier to construct Notifications.
添加Notification.Builder使构建Notification更容易。
静态变量：
/** * Use all default values (where applicable). */ public static final int DEFAULT_ALL = ~0; /** * Use the default notification sound. This will ignore any given * {@link #sound}. * * @see #defaults */ public static final int DEFAULT_SOUND = 1; /** * Use the default notification vibrate. This will ignore any given * {@link #vibrate}. Using phone vibration requires the * {@link android.Manifest.permission#VIBRATE VIBRATE} permission. * * @see #defaults */ public static final int DEFAULT_VIBRATE = 2; /** * Use the default notification lights. This will ignore the * {@link #FLAG_SHOW_LIGHTS} bit, and {@link #ledARGB}, {@link #ledOffMS}, or * {@link #ledOnMS}. * * @see #defaults */ public static final int DEFAULT_LIGHTS = 4; 定义了默认的灯、震动、声音和全部属性。震动的话需要添加 android.permission.VIBRATE权限。
/** * Use this constant as the value for audioStreamType to request that * the default stream type for notifications be used. Currently the * default stream type is STREAM_RING. */ public static final int STREAM_DEFAULT = -1;
notification默认的音频类型。
/** * Bit to be bitwise-ored into the {@link #flags} field that should be * set if you want the LED on for this notification. * <ul> * <li>To turn the LED off, pass 0 in the alpha channel for colorARGB * or 0 for both ledOnMS and ledOffMS.</li> * <li>To turn the LED on, pass 1 for ledOnMS and 0 for ledOffMS.</li> * <li>To flash the LED, pass the number of milliseconds that it should * be on and off to ledOnMS and ledOffMS.</li> * </ul> * <p> * Since hardware varies, you are not guaranteed that any of the values * you pass are honored exactly. Use the system defaults (TODO) if possible * because they will be set to values that work on any given hardware. * <p> * The alpha channel must be set for forward compatibility. * */ public static final int FLAG_SHOW_LIGHTS = 0x00000001; /** * Bit to be bitwise-ored into the {@link #flags} field that should be * set if this notification is in reference to something that is ongoing, * like a phone call. It should not be set if this notification is in * reference to something that happened at a particular point in time, * like a missed phone call. */ public static final int FLAG_ONGOING_EVENT = 0x00000002; /** * Bit to be bitwise-ored into the {@link #flags} field that if set, * the audio will be repeated until the notification is * cancelled or the notification window is opened. */ public static final int FLAG_INSISTENT = 0x00000004; /** * Bit to be bitwise-ored into the {@link #flags} field that should be * set if you want the sound and/or vibration play each time the * notification is sent, even if it has not been canceled before that. */ public static final int FLAG_ONLY_ALERT_ONCE = 0x00000008; /** * Bit to be bitwise-ored into the {@link #flags} field that should be * set if the notification should be canceled when it is clicked by the * user. On tablets, the */ public static final int FLAG_AUTO_CANCEL = 0x00000010; /** * Bit to be bitwise-ored into the {@link #flags} field that should be * set if the notification should not be canceled when the user clicks * the Clear all button. */ public static final int FLAG_NO_CLEAR = 0x00000020; /** * Bit to be bitwise-ored into the {@link #flags} field that should be * set if this notification represents a currently running service. This * will normally be set for you by {@link Service#startForeground}. */ public static final int FLAG_FOREGROUND_SERVICE = 0x00000040; /** * Bit to be bitwise-ored into the {@link #flags} field that should be set if this notification * represents a high-priority event that may be shown to the user even if notifications are * otherwise unavailable (that is, when the status bar is hidden). This flag is ideally used * in conjunction with {@link #fullScreenIntent}. */ public static final int FLAG_HIGH_PRIORITY = 0x00000080; - FLAG_SHOW_LIGHTS:
- FLAG_ONGOING_EVENT：
- FLAG_INSISTENT：
- FLAG_ONLY_ALERT_ONCE：
- FLAG_AUTO_CANCEL：
- FLAG_NO_CLEAR：
- FLAG_FOREGROUND_SERVICE：
- FLAG_HIGH_PRIORITY：
常量
/** * The timestamp for the notification. The icons and expanded views * are sorted by this key. */ public long when; /** * The resource id of a drawable to use as the icon in the status bar. * This is required; notifications with an invalid icon resource will not be shown. */ public int icon; /** * If the icon in the status bar is to have more than one level, you can set this. Otherwise, * leave it at its default value of 0. * * @see android.widget.ImageView#setImageLevel * @see android.graphics.drawable#setLevel */ public int iconLevel; /** * The number of events that this notification represents. For example, in a new mail * notification, this could be the number of unread messages. This number is superimposed over * the icon in the status bar. If the number is 0 or negative, it is not shown in the status * bar. */ public int number; /** * The intent to execute when the expanded status entry is clicked. If * this is an activity, it must include the * {@link android.content.Intent#FLAG_ACTIVITY_NEW_TASK} flag, which requires * that you take care of task management as described in the * <a href="{@docRoot}guide/topics/fundamentals/tasks-and-back-stack.html">Tasks and Back * Stack</a> document. In particular, make sure to read the notification section * <a href="{@docRoot}guide/topics/ui/notifiers/notifications.html#HandlingNotifications">Handling * Notifications</a> for the correct ways to launch an application from a * notification. */ public PendingIntent contentIntent; /** * The intent to execute when the status entry is deleted by the user * with the "Clear All Notifications" button. This probably shouldn't * be launching an activity since several of those will be sent at the * same time. */ public PendingIntent deleteIntent; /** * An intent to launch instead of posting the notification to the status bar. * * @see Notification.Builder#setFullScreenIntent */ public PendingIntent fullScreenIntent; /** * Text to scroll across the screen when this item is added to * the status bar on large and smaller devices. * * <p>This field is provided separately from the other ticker fields * both for compatibility and to allow an application to choose different * text for when the text scrolls in and when it is displayed all at once * in conjunction with one or more icons. * * @see #tickerView */ public CharSequence tickerText; /** * The view to show as the ticker in the status bar when the notification * is posted. */ public RemoteViews tickerView; /** * The view that will represent this notification in the expanded status bar. */ public RemoteViews contentView; /** * The bitmap that may escape the bounds of the panel and bar. */ public Bitmap largeIcon; /** * The sound to play. * * <p> * To play the default notification sound, see {@link #defaults}. * </p> */ public Uri sound; - when：
- icon：
- iconLevel：
- number：
- contentIntent：
- deleteIntent：
- fullScreenIntent：
- tickerText：
- contentView：
- largeIcon：
- sound：
- audioStreamType：
- vibrate：
- ledARGB：
- ledOnMS：
- ledOffMS：
- defaults：
构造函数
默认构造函数： /** * Constructs a Notification object with everything set to 0. * You might want to consider using {@link Builder} instead. */ public Notification() { this.when = System.currentTimeMillis(); } 可以用Notification.Builder来替代构造一个Notification（关于Builder建造者模式http://blog.csdn.net/aomandeshangxiao/article/details/8214646）。
/** * @hide */ public Notification(Context context, int icon, CharSequence tickerText, long when, CharSequence contentTitle, CharSequence contentText, Intent contentIntent) { this.when = when; this.icon = icon; this.tickerText = tickerText; setLatestEventInfo(context, contentTitle, contentText, PendingIntent.getActivity(context, 0, contentIntent, 0)); } 这个构造函数被hide，setLatestEventInfo方法也被deprecate，不建议使用，使用Notification.Builder即可。
/** * Constructs a Notification object with the information needed to * have a status bar icon without the standard expanded view. * * @param icon The resource id of the icon to put in the status bar. * @param tickerText The text that flows by in the status bar when the notification first * activates. * @param when The time to show in the time field. In the System.currentTimeMillis * timebase. * * @deprecated Use {@link Builder} instead. */ @Deprecated public Notification(int icon, CharSequence tickerText, long when) { this.icon = icon; this.tickerText = tickerText; this.when = when; } 这个构造函数是deprecated（弃用）的。
/** * Unflatten the notification from a parcel. */ public Notification(Parcel parcel) { int version = parcel.readInt(); when = parcel.readLong(); icon = parcel.readInt(); number = parcel.readInt(); if (parcel.readInt() != 0) { contentIntent = PendingIntent.CREATOR.createFromParcel(parcel); } if (parcel.readInt() != 0) { deleteIntent = PendingIntent.CREATOR.createFromParcel(parcel); } if (parcel.readInt() != 0) { tickerText = TextUtils.CHAR_SEQUENCE_CREATOR.createFromParcel(parcel); } if (parcel.readInt() != 0) { tickerView = RemoteViews.CREATOR.createFromParcel(parcel); } if (parcel.readInt() != 0) { contentView = RemoteViews.CREATOR.createFromParcel(parcel); } if (parcel.readInt() != 0) { largeIcon = Bitmap.CREATOR.createFromParcel(parcel); } defaults = parcel.readInt(); flags = parcel.readInt(); if (parcel.readInt() != 0) { sound = Uri.CREATOR.createFromParcel(parcel); } audioStreamType = parcel.readInt(); vibrate = parcel.createLongArray(); ledARGB = parcel.readInt(); ledOnMS = parcel.readInt(); ledOffMS = parcel.readInt(); iconLevel = parcel.readInt(); if (parcel.readInt() != 0) { fullScreenIntent = PendingIntent.CREATOR.createFromParcel(parcel); } } 通过一个Parcel参数来构造一个Notification。
其他方法
@Override public Notification clone() { Notification that = new Notification(); that.when = this.when; that.icon = this.icon; that.number = this.number; // PendingIntents are global, so there's no reason (or way) to clone them. that.contentIntent = this.contentIntent; that.deleteIntent = this.deleteIntent; that.fullScreenIntent = this.fullScreenIntent; if (this.tickerText != null) { that.tickerText = this.tickerText.toString(); } if (this.tickerView != null) { that.tickerView = this.tickerView.clone(); } if (this.contentView != null) { that.contentView = this.contentView.clone(); } if (this.largeIcon != null) { that.largeIcon = Bitmap.createBitmap(this.largeIcon); } that.iconLevel = this.iconLevel; that.sound = this.sound; // android.net.Uri is immutable that.audioStreamType = this.audioStreamType; final long[] vibrate = this.vibrate; if (vibrate != null) { final int N = vibrate.length; final long[] vib = that.vibrate = new long[N]; System.arraycopy(vibrate, 0, vib, 0, N); } that.ledARGB = this.ledARGB; that.ledOnMS = this.ledOnMS; that.ledOffMS = this.ledOffMS; that.defaults = this.defaults; that.flags = this.flags; return that; } 官网解释：
Creates and returns a copy of this Object. The default implementation returns a so-called "shallow" copy: It creates a new instance of the same class and then copies the field values (including object references) from this instance to the new instance. A "deep" copy, in contrast, would also recursively clone nested objects. A subclass that needs to implement this kind of cloning should call super.clone() to create the new instance and then create deep copies of the nested, mutable objects.
创建并返回这个对象的一个拷贝。默认的实现返回一个所谓的“浅“复制:它创建一个新的实例相同的类,然后从这个实例复制字段值(包括对象引用)生成新实例。相对应的“深度”拷贝,也会递归地复制嵌套对象。一个子类,实现这种克隆需要调用super.clone()方法来创建一个深层嵌套的、可变的实例。
public int describeContents() { return 0; } 描述了在Parcelable中包含的各种特殊对象的编组表示。在代码中直接返回0。
/** * Flatten this notification from a parcel. */ public void writeToParcel(Parcel parcel, int flags) { parcel.writeInt(1); parcel.writeLong(when); parcel.writeInt(icon); parcel.writeInt(number); if (contentIntent != null) { parcel.writeInt(1); contentIntent.writeToParcel(parcel, 0); } else { parcel.writeInt(0); } if (deleteIntent != null) { parcel.writeInt(1); deleteIntent.writeToParcel(parcel, 0); } else { parcel.writeInt(0); } if (tickerText != null) { parcel.writeInt(1); TextUtils.writeToParcel(tickerText, parcel, flags); } else { parcel.writeInt(0); } if (tickerView != null) { parcel.writeInt(1); tickerView.writeToParcel(parcel, 0); } else { parcel.writeInt(0); } if (contentView != null) { parcel.writeInt(1); contentView.writeToParcel(parcel, 0); } else { parcel.writeInt(0); } if (largeIcon != null) { parcel.writeInt(1); largeIcon.writeToParcel(parcel, 0); } else { parcel.writeInt(0); } parcel.writeInt(defaults); parcel.writeInt(this.flags); if (sound != null) { parcel.writeInt(1); sound.writeToParcel(parcel, 0); } else { parcel.writeInt(0); } parcel.writeInt(audioStreamType); parcel.writeLongArray(vibrate); parcel.writeInt(ledARGB); parcel.writeInt(ledOnMS); parcel.writeInt(ledOffMS); parcel.writeInt(iconLevel); if (fullScreenIntent != null) { parcel.writeInt(1); fullScreenIntent.writeToParcel(parcel, 0); } else { parcel.writeInt(0); } } 用Notification填充Parcel。 /** * Parcelable.Creator that instantiates Notification objects */ public static final Parcelable.Creator<Notification> CREATOR = new Parcelable.Creator<Notification>() { public Notification createFromParcel(Parcel parcel) { return new Notification(parcel); } public Notification[] newArray(int size) { return new Notification[size]; } }; 通过Parcelable.Creator来实例化Notification。
/** * Sets the {@link #contentView} field to be a view with the standard "Latest Event" * layout. * * <p>Uses the {@link #icon} and {@link #when} fields to set the icon and time fields * in the view.</p> * @param context The context for your application / activity. * @param contentTitle The title that goes in the expanded entry. * @param contentText The text that goes in the expanded entry. * @param contentIntent The intent to launch when the user clicks the expanded notification. * If this is an activity, it must include the * {@link android.content.Intent#FLAG_ACTIVITY_NEW_TASK} flag, which requires * that you take care of task management as described in the * <a href="{@docRoot}guide/topics/fundamentals/tasks-and-back-stack.html">Tasks and Back * Stack</a> document. * * @deprecated Use {@link Builder} instead. */ @Deprecated public void setLatestEventInfo(Context context, CharSequence contentTitle, CharSequence contentText, PendingIntent contentIntent) { RemoteViews contentView = new RemoteViews(context.getPackageName(), R.layout.status_bar_latest_event_content); if (this.icon != 0) { contentView.setImageViewResource(R.id.icon, this.icon); } if (contentTitle != null) { contentView.setTextViewText(R.id.title, contentTitle); } if (contentText != null) { contentView.setTextViewText(R.id.text, contentText); } if (this.when != 0) { contentView.setLong(R.id.time, "setTime", when); } this.contentView = contentView; this.contentIntent = contentIntent; } 上面提到的setLatestEventInfo方法，被弃用，使用Notification.Builder替代。 设置最新点击的内容视图，通过设置图标，时间等参数。
@Override public String toString() { StringBuilder sb = new StringBuilder(); sb.append("Notification(contentView="); if (contentView != null) { sb.append(contentView.getPackage()); sb.append("/0x"); sb.append(Integer.toHexString(contentView.getLayoutId())); } else { sb.append("null"); } sb.append(" vibrate="); if (this.vibrate != null) { int N = this.vibrate.length-1; sb.append("["); for (int i=0; i<N; i++) { sb.append(this.vibrate[i]); sb.append(','); } if (N != -1) { sb.append(this.vibrate[N]); } sb.append("]"); } else if ((this.defaults & DEFAULT_VIBRATE) != 0) { sb.append("default"); } else { sb.append("null"); } sb.append(",sound="); if (this.sound != null) { sb.append(this.sound.toString()); } else if ((this.defaults & DEFAULT_SOUND) != 0) { sb.append("default"); } else { sb.append("null"); } sb.append(",defaults=0x"); sb.append(Integer.toHexString(this.defaults)); sb.append(",flags=0x"); sb.append(Integer.toHexString(this.flags)); if ((this.flags & FLAG_HIGH_PRIORITY) != 0) { sb.append("!!!1!one!"); } sb.append(")"); return sb.toString(); } toString()方法。
建造者（Builder）
首先，Builder类是一个静态内部类：public static class Builder { 里面使用到的全局变量：
private Context mContext; private long mWhen; private int mSmallIcon; private int mSmallIconLevel; private int mNumber; private CharSequence mContentTitle; private CharSequence mContentText; private CharSequence mContentInfo; private PendingIntent mContentIntent; private RemoteViews mContentView; private PendingIntent mDeleteIntent; private PendingIntent mFullScreenIntent; private CharSequence mTickerText; private RemoteViews mTickerView; private Bitmap mLargeIcon; private Uri mSound; private int mAudioStreamType; private long[] mVibrate; private int mLedArgb; private int mLedOnMs; private int mLedOffMs; private int mDefaults; private int mFlags; private int mProgressMax; private int mProgress; private boolean mProgressIndeterminate;
参考上面Notification的全局变量。 构造函数：
/** * Constructor. * * Automatically sets the when field to {@link System#currentTimeMillis() * System.currentTimeMllis()} and the audio stream to the {@link #STREAM_DEFAULT}. * * @param context A {@link Context} that will be used to construct the * RemoteViews. The Context will not be held past the lifetime of this * Builder object. */ public Builder(Context context) { mContext = context; // Set defaults to match the defaults of a Notification mWhen = System.currentTimeMillis(); mAudioStreamType = STREAM_DEFAULT; } 需要传入一个Context，然后获取下当前时间，设置下视频流类型。 设置当前事件时间：系统会根据这个时间在状态栏上为Notification排序。
/** * Set the time that the event occurred. Notifications in the panel are * sorted by this time. */ public Builder setWhen(long when) { mWhen = when; return this; } 设置图标：
/** * Set the small icon to use in the notification layouts. Different classes of devices * may return different sizes. See the UX guidelines for more information on how to * design these icons. * * @param icon A resource ID in the application's package of the drawble to use. */ public Builder setSmallIcon(int icon) { mSmallIcon = icon; return this; } /** * A variant of {@link #setSmallIcon(int) setSmallIcon(int)} that takes an additional * level parameter for when the icon is a {@link android.graphics.drawable.LevelListDrawable * LevelListDrawable}. * * @param icon A resource ID in the application's package of the drawble to use. * @param level The level to use for the icon. * * @see android.graphics.drawable.LevelListDrawable */ public Builder setSmallIcon(int icon, int level) { mSmallIcon = icon; mSmallIconLevel = level; return this; } 设置Notification布局的小图标，不同的硬件设备会显示不同的尺寸。可以查看UX文档获取更多如何设计图标的信息。 设置内容标题：
/** * Set the title (first row) of the notification, in a standard notification. */ public Builder setContentTitle(CharSequence title) { mContentTitle = title; return this; } 设置Notification的第一行标题。
设置内容：
/** * Set the text (second row) of the notification, in a standard notification. */ public Builder setContentText(CharSequence text) { mContentText = text; return this; } 设置Notification的第二行内容。
设置Notification右侧数字：
/** * Set the large number at the right-hand side of the notification. This is * equivalent to setContentInfo, although it might show the number in a different * font size for readability. */ public Builder setNumber(int number) { mNumber = number; return this; } 设置在状态栏右侧显示的数字，等同于setContentInfo，也可以显示数字。 设置Notification右侧显示的文本：
/** * Set the large text at the right-hand side of the notification. */ public Builder setContentInfo(CharSequence info) { mContentInfo = info; return this; } 设置进度：
/** * Set the progress this notification represents, which may be * represented as a {@link ProgressBar}. */ public Builder setProgress(int max, int progress, boolean indeterminate) { mProgressMax = max; mProgress = progress; mProgressIndeterminate = indeterminate; return this; } Notification就相当于一个ProgrssBar。
设置内容视图：
** * Supply a custom RemoteViews to use instead of the standard one. */ public Builder setContent(RemoteViews views) { mContentView = views; return this; } 使用自定义视图替代标准视图。
设置PendingIntent：
/** * Supply a {@link PendingIntent} to send when the notification is clicked. * If you do not supply an intent, you can now add PendingIntents to individual * views to be launched when clicked by calling {@link RemoteViews#setOnClickPendingIntent * RemoteViews.setOnClickPendingIntent(int,PendingIntent)}. Be sure to * read {@link Notification#contentIntent Notification.contentIntent} for * how to correctly use this. */ public Builder setContentIntent(PendingIntent intent) { mContentIntent = intent; return this; } 当Notification被点击时提供一个PendingIntent，如果没有提供这个intent，可以在点击时调用RemoteViews.setOnclickPendingIntent(int,PendingIntent)去设置一个PendingIntent. 设置DeleteIntent：
/** * Supply a {@link PendingIntent} to send when the notification is cleared by the user * directly from the notification panel. For example, this intent is sent when the user * clicks the "Clear all" button, or the individual "X" buttons on notifications. This * intent is not sent when the application calls {@link NotificationManager#cancel * NotificationManager.cancel(int)}. */ public Builder setDeleteIntent(PendingIntent intent) { mDeleteIntent = intent; return this; } 设置一个当用户清除状态栏中的Notification是触发的PendingIntent。
设置FullScreenIntent：
/** * An intent to launch instead of posting the notification to the status bar. * Only for use with extremely high-priority notifications demanding the user's * <strong>immediate</strong> attention, such as an incoming phone call or * alarm clock that the user has explicitly set to a particular time. * If this facility is used for something else, please give the user an option * to turn it off and use a normal notification, as this can be extremely * disruptive. * * @param intent The pending intent to launch. * @param highPriority Passing true will cause this notification to be sent * even if other notifications are suppressed. */ public Builder setFullScreenIntent(PendingIntent intent, boolean highPriority) { mFullScreenIntent = intent; setFlag(FLAG_HIGH_PRIORITY, highPriority); return this; } 一个全屏状态下替代状态栏上的Notification的intent，仅适用于使用非常高的优先级通知，会引起用户的即时关注，如用户已显式设置为一个特定的时间，一个来电或闹钟。
设置TickerText：
/** * Set the text that is displayed in the status bar when the notification first * arrives. */ public Builder setTicker(CharSequence tickerText) { mTickerText = tickerText; return this; } /** * Set the text that is displayed in the status bar when the notification first * arrives, and also a RemoteViews object that may be displayed instead on some * devices. */ public Builder setTicker(CharSequence tickerText, RemoteViews views) { mTickerText = tickerText; mTickerView = views; return this; } 设置 Notification第一次到达时在status Bar 上面显示的文本，第二个方法里面还可以设置一个自定义视图。 设置大图标：
/** * Set the large icon that is shown in the ticker and notification. */ public Builder setLargeIcon(Bitmap icon) { mLargeIcon = icon; return this; } 设置声音：
/** * Set the sound to play. It will play on the default stream. */ public Builder setSound(Uri sound) { mSound = sound; mAudioStreamType = STREAM_DEFAULT; return this; } /** * Set the sound to play. It will play on the stream you supply. * * @see #STREAM_DEFAULT * @see AudioManager for the <code>STREAM_</code> constants. */ public Builder setSound(Uri sound, int streamType) { mSound = sound; mAudioStreamType = streamType; return this; } 设置震动：
/** * Set the vibration pattern to use. * * @see android.os.Vibrator for a discussion of the <code>pattern</code> * parameter. */ public Builder setVibrate(long[] pattern) { mVibrate = pattern; return this; } 设置LED灯光：
/** * Set the argb value that you would like the LED on the device to blnk, as well as the * rate. The rate is specified in terms of the number of milliseconds to be on * and then the number of milliseconds to be off. */ public Builder setLights(int argb, int onMs, int offMs) { mLedArgb = argb; mLedOnMs = onMs; mLedOffMs = offMs; return this; } 设置Ongoing：
/** * Set whether this is an ongoing notification. * * <p>Ongoing notifications differ from regular notifications in the following ways: * <ul> * <li>Ongoing notifications are sorted above the regular notifications in the * notification panel.</li> * <li>Ongoing notifications do not have an 'X' close button, and are not affected * by the "Clear all" button. * </ul> */ public Builder setOngoing(boolean ongoing) { setFlag(FLAG_ONGOING_EVENT, ongoing); return this; } 设置Notification是否是正在进行。 设置是否只提示一次：
/** * Set this flag if you would only like the sound, vibrate * and ticker to be played if the notification is not already showing. */ public Builder setOnlyAlertOnce(boolean onlyAlertOnce) { setFlag(FLAG_ONLY_ALERT_ONCE, onlyAlertOnce); return this; } 设置是否自动取消：
/** * Setting this flag will make it so the notification is automatically * canceled when the user clicks it in the panel. The PendingIntent * set with {@link #setDeleteIntent} will be broadcast when the notification * is canceled. */ public Builder setAutoCancel(boolean autoCancel) { setFlag(FLAG_AUTO_CANCEL, autoCancel); return this; } 里面都用的私有setFlag方法：
private void setFlag(int mask, boolean value) { if (value) { mFlags |= mask; } else { mFlags &= ~mask; } } 使用默认设置：
/** * Set the default notification options that will be used. * <p> * The value should be one or more of the following fields combined with * bitwise-or: * {@link #DEFAULT_SOUND}, {@link #DEFAULT_VIBRATE}, {@link #DEFAULT_LIGHTS}. * <p> * For all default values, use {@link #DEFAULT_ALL}. */ public Builder setDefaults(int defaults) { mDefaults = defaults; return this; } 通过ID获取notification视图：
private RemoteViews makeRemoteViews(int resId) { RemoteViews contentView = new RemoteViews(mContext.getPackageName(), resId); boolean hasLine3 = false; if (mSmallIcon != 0) { contentView.setImageViewResource(R.id.icon, mSmallIcon); contentView.setViewVisibility(R.id.icon, View.VISIBLE); } else { contentView.setViewVisibility(R.id.icon, View.GONE); } if (mContentTitle != null) { contentView.setTextViewText(R.id.title, mContentTitle); } if (mContentText != null) { contentView.setTextViewText(R.id.text, mContentText); hasLine3 = true; } if (mContentInfo != null) { contentView.setTextViewText(R.id.info, mContentInfo); contentView.setViewVisibility(R.id.info, View.VISIBLE); hasLine3 = true; } else if (mNumber > 0) { final int tooBig = mContext.getResources().getInteger( R.integer.status_bar_notification_info_maxnum); if (mNumber > tooBig) { contentView.setTextViewText(R.id.info, mContext.getResources().getString( R.string.status_bar_notification_info_overflow)); } else { NumberFormat f = NumberFormat.getIntegerInstance(); contentView.setTextViewText(R.id.info, f.format(mNumber)); } contentView.setViewVisibility(R.id.info, View.VISIBLE); hasLine3 = true; } else { contentView.setViewVisibility(R.id.info, View.GONE); } if (mProgressMax != 0 || mProgressIndeterminate) { contentView.setProgressBar( R.id.progress, mProgressMax, mProgress, mProgressIndeterminate); contentView.setViewVisibility(R.id.progress, View.VISIBLE); } else { contentView.setViewVisibility(R.id.progress, View.GONE); } if (mWhen != 0) { contentView.setLong(R.id.time, "setTime", mWhen); } contentView.setViewVisibility(R.id.line3, hasLine3 ? View.VISIBLE : View.GONE); return contentView; } 获取默认视图：
private RemoteViews makeContentView() { if (mContentView != null) { return mContentView; } else { return makeRemoteViews(mLargeIcon == null ? R.layout.status_bar_latest_event_content : R.layout.status_bar_latest_event_content_large_icon); } } 获取TickerView：
private RemoteViews makeTickerView() { if (mTickerView != null) { return mTickerView; } else { if (mContentView == null) { return makeRemoteViews(mLargeIcon == null ? R.layout.status_bar_latest_event_ticker : R.layout.status_bar_latest_event_ticker_large_icon); } else { return null; } } } 注意上面三个方法均是私有方法，在外部不能访问，在下面的方法中调用到了这些方法
通过Builder最后获取一个Notification：
/** * Combine all of the options that have been set and return a new {@link Notification} * object. */ public Notification getNotification() { Notification n = new Notification(); n.when = mWhen; n.icon = mSmallIcon; n.iconLevel = mSmallIconLevel; n.number = mNumber; n.contentView = makeContentView(); n.contentIntent = mContentIntent; n.deleteIntent = mDeleteIntent; n.fullScreenIntent = mFullScreenIntent; n.tickerText = mTickerText; n.tickerView = makeTickerView(); n.largeIcon = mLargeIcon; n.sound = mSound; n.audioStreamType = mAudioStreamType; n.vibrate = mVibrate; n.ledARGB = mLedArgb; n.ledOnMS = mLedOnMs; n.ledOffMS = mLedOffMs; n.defaults = mDefaults; n.flags = mFlags; if (mLedOnMs != 0 && mLedOffMs != 0) { n.flags |= FLAG_SHOW_LIGHTS; } if ((mDefaults & DEFAULT_LIGHTS) != 0) { n.flags |= FLAG_SHOW_LIGHTS; } return n; } Builder的最后，提供一个完整的产品出来。
PS： 写到这，正文部分大体完成，现在时间也已经是晚上11点钟，1000多行的代码，推迟了3天才把文章写完，进度确实有点慢，最近在读凯利麦格尼格尔女士的《自控力》这本书，看到“道德许可效应”，解决了自己关于很多事情的疑问。还没有读完，感觉是一本不错的书籍，推荐一下。 另外，周五有次重要的谈话，祝自己顺利。
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