How to add a notification settings activity to the system settings

Question

On Android 5.0 there is an option through Settings -> Sound & notification -> App notification -> Calendar (for example) to go directly to the notification settings of the app.
I also know it's a flag in the manifest as described in this DEV.BYTES talk.
How can it be achieved, what is the flag used?

Here is a screenshot for more clarification:

Answer 1

You need to add the Intent category Notification.INTENT_CATEGORY_NOTIFICATION_PREFERENCES to the Activity you'd like to launch through your AndroidManifest. A simple example would be something like:

    <activity android:name="com.example.packagename.YourSettingsActivity" >

        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.NOTIFICATION_PREFERENCES" />
        </intent-filter>
    </activity>

For more information, refer to the Settings app and specifically the NotificationAppList and AppNotificationSettings fragments.

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