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As you and I already know, All apps on the android can't read other app's data basically without root. (since sandbox system.)
But recently released google Home app read saved wifi password on the phone and connect device with its password . How can it be? I couldn't understand this behavior is possible.
I confirmed that works even though I logged out google account. (It means wifi password is coming from local device's saved configuration).
Google announced that auto fetch feature works after lollipop only.
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Here's what you need to do: Step 1: Go to the “Google Home” app on your Android device. Step 2: Click on the “Wi-Fi” option and tap on the “Show password” option. Step 3: Click on Copy, Email, or Message to share the Wi-Fi password.
If an Android device (phone or tablet) has ever logged on to a particular Wi-Fi network, then Google probably knows the Wi-Fi password. Considering how many Android devices there are, it is likely that Google can access most Wi-Fi passwords worldwide.
I'm asking myself this question too. From my experience maybe also Amazon Alexa companion app has this feature.
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