New answers tagged accessibility
You can use this app to set the color of status bar through Accessibility Service :Color Status Bar (Note: This app runs in background to enable the color. And, this app will work only on devices running Android 5 or above..) But to change the color of navigation bar, you need root access. If your device is rooted, do the following to change navbar color: ...
Try going into Settings / My Device / Accessibility and turning on Magnification Gestures. A triple tap on your scree will enlarge what is there including text and then another triple tap will take you back. While it is enlarged, you can scroll with one finger. That's the best I've found so far.
The Application which applies the overlay can be found using application permission manager. Simply go through the native application manager (or download from play store) and check whether any app has permission for "Draw over screen" or "Apply Overlay" or "draw over other apps".
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