Making phone turn on automatically and launch a specific app?

[Android Central Question]

I found a good tachometer app on android which includes a compass and some cool stuff. I have spare android phones around and I want to install one of them into my car, the issue here is I'm trying to find a way to make the phone turn on automatically when it gets power and then launches the app, and finally shuts down when it doesn't get charging power anymore. Does anyone know how to make this?

 

[Mooncatt]

That would require hardware specific changes to the phone, where getting power through the USB trips a trigger on the power switch. When a phone is shut off, it's shut off. Period. At best it may be monitoring the power button with a very minimal process, but otherwise the processor and other hardware are powered down. I have heard of a phone turning on in the past when plugged in, but only in the context of something being defective because that shouldn't be the car under normal circumstances.

 

[mustang7757]

Why is your tachometer not working?
I'll leave a Link to register so you can communicate here as a guest account you can only post questions but can't reply

https://forums.androidcentral.com/showthread.php?t=409154

 

[hallux]

Additionally - the boot time of most phones is not short so if it's actually powered off you're going to be waiting possibly some time before it's booted and ready to start your trip.

 

[J Dubbs]

That would require hardware specific changes to the phone, where getting power through the USB trips a trigger on the power switch. When a phone is shut off, it's shut off. Period. At best it may be monitoring the power button with a very minimal process, but otherwise the processor and other hardware are powered down. I have heard of a phone turning on in the past when plugged in, but only in the context of something being defective because that shouldn't be the car under normal circumstances.

Windows phones powered on automatically when you plugged them in to charge..... I hated that feature lol.

 

[B. Diddy]

Welcome to Android Central! Maybe Tasker would work? This Reddit thread seems to indicate that you can program it to wake when it detects the battery level rising: https://www.reddit.com/r/tasker/comments/7i7zia/power_on_then_charging/. So the phone can't completely power down or power up, but putting the screen to sleep and then waking it might be a reasonable alternative.