How to change the notification sound on your Android phone | NextPit
Get Android Oreo's Notification Shade on Any Phone — No Root Needed « Android :: Gadget Hacks
How to Change the Notification Sound on Your Android Phone - Make Tech Easier
Get Android Oreo's Notification Shade on Any Phone — No Root Needed « Android :: Gadget Hacks
Android O: How to Use Notification Channels
Android O: How to Use Notification Channels
Android Oreo Notification Channels
4 Ways to Add Notification Sounds on Android - wikiHow
Android 8.1 limits notification sounds to one per second for every app - Android Authority
Custom Sound not playing in Android version 8 (Oreo). Plays default sound for local notification · Issue #1605 · katzer/cordova-plugin-local- notifications · GitHub