A change made to the OS in Android 9 Pie, while not widely known, makes raising the ringtone volume a noisy affair. Previously, the default setting for the volume controls on an Android phone was the ringtone unless you were playing media on the device. With Android 9, the rocker on the side of a handset changes the media volume by default. And even though pressing the volume rocker and tapping on the bell icon will rotate between vibrate, silent and ringer (see arrow on the image at the top of the article), you cannot actually change the ringtone volume without going into your phone's settings. ...


원문출처 : https://www.phonearena.com/news/Future-update-will-allow-Android-9-users-to-quietly-raise-a-phones-ringtone-volume_id109240