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In the previous android version (Lollipop, Marshmallow, Nougat and may be Oreo) there was a metronome sound when the phone was waiting for disc encryption password: "To start Android, enter your password".

It was very useful, as it indicated that user action is required.

But now, Pie (and may be Oreo, I don't remember) it's gone. I don't know the behavior of android 10.

Is it possible to bring the metronome sound back?

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The older Android versions were using Full Disk Encryption (FDE) mode, therefore the password enter dialog was a small mini-OS booted before the actual Android-OS. This mini-OS was playing what you are a calling the "metronome sound" when it was waiting for the user password.

I assume this sound was introduced to ensure the user recognizes that the boot process requires user interaction. Because while the mini-OS is waiting for input the whole system is offline and no app is running - including no mobile voice/data or Wifi.

Nowadays Android use File Based Encryption (FBE) which means that every app can specify if a data is encrypted using the system key or the key that requires the user to unlock the device first. Therefore in theory if all apps are correctly implemented a large part of the system should already work before you enter your user password the first time after a reboot.

May be you are able to simulate the old behavior by installing an app that runs only after the Android device has booted up (BOOT_COMPLETED) and then plays a sound similar to your old system. Unfortunately I don't know a suitable app, but I assume programmable scripting apps like "Tasker" may allow you to create a script that plays a sound after the device has booted up.

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  • Sorry for bad explanation, but the question was only about FDE, so it isn't an answer. The Android 9 that I have uses FDE, but has no metronome sound.
    – sergio
    Dec 30, 2019 at 5:21
  • @sergio Then most likely your device was upgraded from a lower Android version. Therefore when asking here on Android stackexchange one should always mention the device model.
    – Robert
    Dec 30, 2019 at 11:53

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