If you have a phone with a perforated display, you can use the camera cutout as a battery indicator on Android.
1. Energy Ring
Energy Ring offers a convenient way to add a ring around the camera lens that shows the current battery level. This is one of the first apps to offer this feature. There used to be different versions for different devices. Recently, however, the developer combined all the options, adding support for all devices into one app.
The app supports most phones from Samsung, such as the Samsung Galaxy Z Fold 2, Galaxy Z Flip (5G), Galaxy S10, S20, S20 FE, S21, Galaxy Note 10, Note 20-series, Galaxy A60, A51, A71, M40 and Galaxy M31s.
In addition, it also supports other popular phones such as OnePlus 8 Pro, OnePlus Nord, Pixel 4a (5G), Pixel 5, Poco M2 Pro, Redmi Note 9, Realme 6i, Realme X50 Pro, Motorola Edge, One Action, One Vision, Moto. G8 Power, Honor 20, Honor View 20, Huawei Nova 4, Nova 5T, Huawei P40 Lite and P40 Pro.
2. Battery Ring
Battery Ring is another similar application that allows you to use a battery percentage indicator around the camera. You can change the characteristics of the indicator ring, such as color, position, thickness, transparency, etc.
3. Arc Lighting.
Arc Lighting is a much more versatile application that allows you to use the camera cutout to visualize audio, illuminate notifications, critical or low battery warnings, and a charge indicator. The ring can also work with a permanent display function.