Android - How to check the current platform of Android OS?

If you have adb set up, it's a one-liner at the shell prompt:

$ adb shell "getprop ro.product.cpu.abi"

In this example, the device asked answered that it has a 64bit ARM V8a CPU (second line).

Note: You can also run the quoted command in a terminal emulator running on the device / emulator. In there, it's just getprop ro.product.cpu.abi.

CPU -Z is a versatile app that gives you SoC information apart from some other apps

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From app description on play store