Open Notification Channel settings in system from app's setting screen in Oreo.

[mstssk]

Overview (Required)

• Users can specify settings for each Notification Channels from Android 8.0 Oreo.
• So we need to implement links to Notification Channel settings, like this:

Intent intent = new Intent(Settings.ACTION_CHANNEL_NOTIFICATION_SETTINGS);
intent.putExtra(Settings.EXTRA_CHANNEL_ID, channelId);
intent.putExtra(Settings.EXTRA_APP_PACKAGE, getPackageName());
startActivity(intent);

Links

• https://qiita.com/mstssk/items/14e1b94be6c52af3a0a6#%E3%82%A2%E3%83%97%E3%83%AA%E5%81%B4%E3%81%8B%E3%82%89os%E5%81%B4
• https://developer.android.com/guide/topics/ui/notifiers/notifications.html?hl=en#UpdateChannel