Warning: ROOT access is required.
Some devices (e.g. Samsung) encrypt WiFi passwords, so that no app can show them clearly. To show them, please, following the instruction in the Welcome Alert Dialog in the app or here: android.stackexchange.com/questions/95923/decrypting-wpa-supplicant-conf-on-samsung-galaxy-mobiles. Thanks for collaboration.
N. B.: it's impossible to make an application to show WiFi passwords without requiring root, as it has to read a file that is in an inaccessible location without administrator privileges (/data/misc/wifi/wpa_supplicant.conf).
What's New:
Added compatibility with Android 11
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