To make the notification appear, call NotificationManagerCompat. For example:. A notification can offer up to three action buttons that allow the user to respond quickly, such as snooze a reminder or even reply to a text message.
But these action buttons should not duplicate the action performed when the user taps the notification. Figure 2.
A notification with one action button. To add an action button, pass a PendingIntent to the addAction method. This is just like setting up the notification's default tap action, except instead of launching an activity, you can do a variety of other things such as start a BroadcastReceiver that performs a job in the background so the action does not interrupt the app that's already open. For more information about building a BroadcastReceiver to run background work, see the Broadcasts guide.
If you're instead trying to build a notification with media playback buttons such as to pause and skip tracks , see how to create a notification with media controls. The direct reply action, introduced in Android 7. For example, you can use a direct reply action to let users reply to text messages or update task lists from within the notification. Figure 3. Tapping the "Reply" button opens the text input. The direct reply action appears as an additional button in the notification that opens a text input.
When the user finishes typing, the system attaches the text response to the intent you had specified for the notification action and sends the intent to your app. Caution: If you re-use a PendingIntent , a user may reply to a different conversation than the one they thought they did. You must either provide a request code that is different for each conversation or provide an intent that doesn't return true when you call equals on the reply intent of any other conversation.
The conversation ID is frequently passed as part of the intent's extras bundle, but is ignored when you call equals. The system prompts the user to input a response when they trigger the notification action, as shown in figure 3. To receive user input from the notification's reply UI, call RemoteInput.
This is necessary to hide direct reply UI and confirm to the user that their reply was received and processed correctly. When working with this new notification, use the context that's passed to the receiver's onReceive method.
You should also append the reply to the bottom of the notification by calling setRemoteInputHistory. For more advice for notifications from a messaging apps, see best practices for messaging apps. Notifications can include an animated progress indicator that shows users the status of an ongoing operation. Figure 4. The progress bar during and after the operation. If you can estimate how much of the operation is complete at any time, use the "determinate" form of the indicator as shown in figure 4 by calling setProgress max, progress, false.
The first parameter is what the "complete" value is such as ; the second is how much is currently complete, and the last indicates this is a determinate progress bar. As your operation proceeds, continuously call setProgress max, progress, false with an updated value for progress and re-issue the notification. At the end of the operation, progress should equal max.
You can either leave the progress bar showing when the operation is done, or remove it. In either case, remember to update the notification text to show that the operation is complete. To remove the progress bar, call setProgress 0, 0, false. To display an indeterminate progress bar a bar that does not indicate percentage complete , call setProgress 0, 0, true. The result is an indicator that has the same style as the progress bar above, except the progress bar is a continuous animation that does not indicate completion.
The progress animation runs until you call setProgress 0, 0, false and then update the notification to remove the activity indicator. Android uses some pre-defined system-wide categories to determine whether to disturb the user with a given notification when the user has enabled Do Not Disturb mode.
This information about your notification category is used by the system to make decisions about displaying your notification when the device is in Do Not Disturb mode.
However, you are not required to set a system-wide category and should only do so if your notifications match one of the categories defined by in NotificationCompat.
Your app might need to display an urgent, time-sensitive message, such as an incoming phone call or a ringing alarm. In these situations, you can associate a full-screen intent with your notification.
When the notification is invoked, users see one of the following, depending on the device's lock status:. The following code snippet demonstrates how to associate your notification with a full-screen intent:. To control the level of detail visible in the notification from the lock screen, call setVisibility and specify one of the following values:. For example, an SMS app might display a notification that shows You have 3 new text messages , but hides the message contents and senders.
To provide this alternative notification, first create the alternative notification with NotificationCompat. Builder as usual. Then attach the alternative notification to the normal notification with setPublicVersion. However, the user always has final control over whether their notifications are visible on the lock screen and can even control that based on your app's notification channels.
To update this notification after you've issued it, call NotificationManagerCompat. If the previous notification has been dismissed, a new notification is created instead. You can optionally call setOnlyAlertOnce so your notification interupts the user with sound, vibration, or visual clues only the first time the notification appears and not for later updates.
Use the best practices listed here as a quick reference of what to keep in mind when creating notifications for your messaging and chat apps. Starting in Android 7. Using the NotificationCompat. MessagingStyle class, you can change several of the labels displayed on the notification, including the conversation title, additional messages, and the content view for the notification. The following code snippet demonstrates how to customize a notification's style using the MessagingStyle class.
Starting in Android 8. MessagingStyle class display more content in their collapsed form. You can also use the addHistoricMessage method to provide context to a conversation by adding historic messages to messaging-related notifications.
When using NotificationCompat. MessagingStyle :. Content and code samples on this page are subject to the licenses described in the Content License. App Basics. Build your first app. App resources. Sign up using Email and Password.
Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast Who is building clouds for the independent developer? Exploding turkeys and how not to thaw your frozen bird: Top turkey questions Featured on Meta. Now live: A fully responsive profile. Reducing the weight of our footer. Related Hot Network Questions. Android Oreo recognizes text when you tap or select, then recommends a next logical step via a suggested app.
Working to keep your device and data safe from misbehaving apps by scanning over 50 billion apps per day, even the ones you haven't installed yet! Whether you're talking, playing, working or streaming, you can feel confident about keeping your battery strong and full of life.
Share the feels with a fully redesigned emoji set, including over 60 new emoji. Allows you to quickly access from the navigation bar accessibility features, like magnification, and functionality within accessibility services, like Select to Speak. Developers can now provide a full-bleed square shaped icon and OEMs will mask the icon to ensure intra-device consistency. Highlights the incoming notification with larger font, highlighted app name and immediate access to actions.
Enables applications to render richer visual content with more vibrant colors and subtler gradients. Supports full color management which allows applications to render images in the format and quality they were intended.
Hostile downloader apps can't operate without permission; users now permit the installation of APKs per-source. More granular and consistent control over which notifications can appear and how intrusive they are. The biggest change to the foundations of Android to date: a modular architecture that makes it easier and faster for hardware makers to deliver Android updates. Developers can now let the size of their text expand or contract automatically based on the size and characteristics of the TextView, making it much easier to optimize the text size on different screens or with dynamic content.
Learn more. Explore these carousel items. Networking Software. Trending from CNET. Editors' Review shelbybrown Sep 1, Pros Improved app notifications: Through notification channels, apps will have more control over the types of notifications they send, and users will be able to better manage notification settings. Full Specifications. What's new in version. Release August 14, Date Added August 14, Operating Systems.
Operating Systems Android. Additional Requirements None. Total Downloads , Downloads Last Week Report Software. Related Apps. Android 6. Update your mobile device to the latest version of the Android operating system.
0コメント