Android开发文档——Notifications

原文地址：http://developer.android.com/guide/topics/ui/notifiers/notifications.html

这里只介绍一下我认为重要的内容：

• Notification展示元素

普通视图

1. 内容标题（Content title）
2. 大icon（Large icon）
3. 内容文本（Content text）
4. 内容信息（Content info）
5. 小icon（Small icon）
6. 创建时间（Time that the notification was issued. ）可以使用setWhen（）方法来修改。

大视图

比普通视图多了7：详细内容。

• 创建一个Notification

直接上代码吧：

NotificationCompat.Builder mBuilder =        new NotificationCompat.Builder(this)        .setSmallIcon(R.drawable.notification_icon)        .setContentTitle("My notification")        .setContentText("Hello World!");// Creates an explicit intent for an Activity in your appIntent resultIntent = new Intent(this, ResultActivity.class);// The stack builder object will contain an artificial back stack for the// started Activity.// This ensures that navigating backward from the Activity leads out of// your application to the Home screen.TaskStackBuilder stackBuilder = TaskStackBuilder.create(this);// Adds the back stack for the Intent (but not the Intent itself)stackBuilder.addParentStack(ResultActivity.class);// Adds the Intent that starts the Activity to the top of the stackstackBuilder.addNextIntent(resultIntent);PendingIntent resultPendingIntent =        stackBuilder.getPendingIntent(            0,            PendingIntent.FLAG_UPDATE_CURRENT        );mBuilder.setContentIntent(resultPendingIntent);NotificationManager mNotificationManager =    (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);// mId allows you to update the notification later on.mNotificationManager.notify(mId, mBuilder.build());

大视图的话，只需添加如下代码：

NotificationCompat.InboxStyle inboxStyle =        new NotificationCompat.InboxStyle();String[] events = new String[6];// Sets a title for the Inbox style big viewinboxStyle.setBigContentTitle("Event tracker details:");...// Moves events into the big viewfor (int i=0; i < events.length; i++) {    inboxStyle.addLine(events[i]);}// Moves the big view style object into the notification object.mBuilder.setStyle(inBoxStyle);

• 管理Notification

更新Notification

mNotificationManager =        (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);// Sets an ID for the notification, so it can be updatedint notifyID = 1;mNotifyBuilder = new NotificationCompat.Builder(this)    .setContentTitle("New Message")    .setContentText("You've received new messages.")    .setSmallIcon(R.drawable.ic_notify_status)numMessages = 0;// Start of a loop that processes data and then notifies the user...    mNotifyBuilder.setContentText(currentText)        .setNumber(++numMessages);    // Because the ID remains unchanged, the existing notification is    // updated.    mNotificationManager.notify(            notifyID,            mNotifyBuilder.build());...

移除Notification

1.用户自己点击通知栏里的“清除所有”按钮（就是右上角的叉叉，当然该Notification能被移除才行）。

2.mBuilder.setAutoCancel()，当用户点击该Notification时，会自动移除。

3.通过调用cancel（）方法来移除之前设置的特定ID的Notification。

4.调用cancelAll（）方法来移除所有的Notification。

• 在Notification里展示进度条

分两种情况：

进度的时间是确定的：

mNotifyManager =        (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);mBuilder = new NotificationCompat.Builder(this);mBuilder.setContentTitle("Picture Download")    .setContentText("Download in progress")    .setSmallIcon(R.drawable.ic_notification);// Start a lengthy operation in a background threadnew Thread(    new Runnable() {        @Override        public void run() {            int incr;            // Do the "lengthy" operation 20 times            for (incr = 0; incr <= 100; incr+=5) {                    // Sets the progress indicator to a max value, the                    // current completion percentage, and "determinate"                    // state                    mBuilder.setProgress(100, incr, false);                    // Displays the progress bar for the first time.                    mNotifyManager.notify(0, mBuilder.build());                        // Sleeps the thread, simulating an operation                        // that takes time                        try {                            // Sleep for 5 seconds                            Thread.sleep(5*1000);                        } catch (InterruptedException e) {                            Log.d(TAG, "sleep failure");                        }            }            // When the loop is finished, updates the notification            mBuilder.setContentText("Download complete")            // Removes the progress bar                    .setProgress(0,0,false);            mNotifyManager.notify(ID, mBuilder.build());        }    }// Starts the thread by calling the run() method in its Runnable).start();

时间不确定：

// Sets the progress indicator to a max value, the current completion// percentage, and "determinate" statemBuilder.setProgress(100, incr, false);// Issues the notificationmNotifyManager.notify(0, mBuilder.build());

//在这里处理你要做的事

 // Sets an activity indicator for an operation of indeterminate lengthmBuilder.setProgress(0, 0, true);// Issues the notificationmNotifyManager.notify(0, mBuilder.build());

时间有限，提取比较粗糙，请多见谅。