user-interface-samples | Multiple samples showing the best practices | Android library

I'm learning the Android Launcher Shortcuts.

The code A is from the office sample project.

I know that the Launcher Shortcuts API requires Android 7.1 (API 25) or higher.

The Code A can be compiled and run after I replace minSdkVersion 25 with minSdkVersion 21, why?

Code A

I am trying to integrate Firebase Cloud Messages into my app. The code I used in the showNotification function is from the Android User Interface Samples. I tried it in the Activity and it worked but am not sure why it's not working in the service. The println is showing the function is getting called and values are coming as expected. Is there anything am missing from the function?

I am trying to implement the Android Bubbles notifications API but it's not working for me, it's displaying as an ordinary notification. I am testing on emulator API 30(Android 11). I got the people-example working on the device, and I am following the Conversation Notifications guidelines.

• The notification uses MessagingStyle.
• (Only if the app targets Android 11 or higher) The notification is associated with a valid long-lived dynamic or cached sharing shortcut. The notification can set this association by calling setShortcutId() or setShortcutInfo(). If the app targets Android 10 or lower, the notification doesn't have to be associated with a shortcut, as discussed in the fallback options section.
• The user hasn't demoted the conversation from the conversation section via notification channel settings, at the time of posting.

Please tell me what did I missed?

Also, I got a few optional questions about the design of Bubbles.

• At what point of the app should I create the shortcuts and when to update it?
• How the Person object needs to be cached?

This is what I got so far

I'm learning Notifications, I use Android Studio 4.0 with latest androidx.core.app.NotificationManagerCompat.

There is a sample code about Notifications in the project user-interface-samples.

I find there are many differents about Notifications between this androidx and previous API.

Must the Notifications style be the one of BigTextStyleNotification, BigPictureStyleNotification, InboxStyleNotification and MessagingStyleNotification ?

The following code is a sample code about Notifications in the project user-interface-samples.

Image A will be displayed when I launch BIG_PICTURE_STYLE notification, Image B will be displayed when I click the earth image and the notification icon on top toolbar will dismiss.

1: If I click "No" button on Image A，the notification icon on top toolbar will dismiss and this notification view will dismiss too.
I'm very strange the function private void handleActionComment(CharSequence comment) in BigPictureSocialIntentService.java has recreates the notification, why will the notification icon dismiss?

2: I modified BigPictureSocialIntentService.java, you can see BigPictureSocialIntentService_Modified.java, then I click "No" button on Image A, I find the notification icon dismiss, but the notification view keep display,you can see Image C, why?

BTW, I test it in API 30.

MainActivity.java

The Code A is a sample code about Notifications in the project user-interface-samples.

I trun off the notifications of the app, then run the app, an information "You need to enable notifications for this app" is displayed.

When I click the Snackbar on API 28 emulator, the following error is displayed:

I'm learning Notifications.

There is a sample project user-interface-samples, I find many files in the project exists Code A.

But the artical tell me "NotificationCompat is obsolete", please see Image A

1: Code A use latest androidx namesapce, why is it obsolete?

2: Is there a sample project about Notifications based AndroidX which is part of Jetpack.

Code A

Are there any examples of using the Jetpack / androidx preference library alongside the navigation component / Single activity? All the examples I'm seeing ( e.g. Google's example ) are using supportFragmentManager and replacing the content of a FrameLayout.

Navigating to the PreferenceFragmentCompat() with the navigation component almost works, in that it shows the Preferences page, but it is missing all of the toolbar/navigation icons. It's just implanted over the previous fragment, so to exit it, you need to hit the hardware back button.

Looks like this already has an issue filed with Google's issue tracker here