Here's the app:
It asks for a password
Pulling the APK file from the Android device and unpacking it with apktool:
A simple grep for "secretpassword" reveals the password, which I have redacted in the image below:
That password unlocks the app:
Here's the app:
It asks for a password
The password from the Android APK file unlocks the app:
They should be hashed with many rounds of a hashing function and salted.