Well, if the Andriod devices are not safe to install the bitcoin wallet, the laptops / Desktop aren't safe too. Any device which is connected to the Internet increase the chances of getting vulnerable to malwares / hacks etc.
We have to make exceptions too in that context. I don't want to equate all devices that will have dangerous wallets installed.
Even though computer and mobile devices where the wallet application is installed have a feature that functions to on/off the internet connection, in the same case both types of devices are also vulnerable to malware as long as they are used incorrectly.
Ideally, a computer or laptop device has advantages in terms of installing a wallet compared to mobile devices which have limitations.
CMIIW