By default device theme set as automatically based on your wallpaper on your Android 9 Pie. If you want to set the Android Pie dark mode or dark theme, set black wallpaper, and set a light theme to set a white background. You can manually enable dark mode in the Android 9 Pie device using display settings. Automatically turn on dark mode on Android 10 if updated with the latest Android version.
The first-time theme option introduced in Android Pie Dev preview 4 or Android P Beta 3 added new features that include the back button in the navigation bar, set light or dark theme, rotation lock button, and more settings.
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How to Change Theme in Android Pie 9.0
To change the Android 9 theme, follow below the given complete guide.
Step 1: Swipe down notification shade two times and tap the Settings gear icon.
Step 2: Tap Display.
Step 3: Tap Advanced.
Step 4: Tap Device theme.
By default set Android Pie 9.0 theme as automatic (based on wallpaper).
Step 5: Choose Light or dark you want to set the theme on Android Pie.
If you want to save battery life in Android Pie 9.0, set dark them in your device.
How to Change Wallpaper in Android 9 Pie Home and Lock Screen
This change wallpaper will change your Android device to look as dark or light. Set black wallpaper for dark theme and white wallpaper for the light theme in Android Pie 9.0 devices.
Step 1: Go to settings in your Android Pie.
Step 2: Tap Display.
Step 3: Tap Wallpaper.
Step 4: Choose the wallpaper you want to set as a theme.
Step 5: Tap Set wallpaper at the upper right side corner.
Step 6: Choose the home screen/lock screen/Both.
You can also change the Android Pie wallpaper using below given settings.
Tap & hold the blank space in Android Pie home screen > Wallpapers > Select wallpaper > Set wallpaper > Home screen/Lock screen/Both
And that’s all. I hope this tutorial helpful to change the theme in Android 9 Pie. If you have any questions, tell us in below comment box.