如何检查设备是否支持SMS？

Question

I want to disable SMS features programmatically on tablets without SIM card slot.

I have tried this:

if (context.getSystemService(Context.TELEPHONY_SERVICE) != null)
{
    // SMS features: enable
}
else
{
    // SMS features: disable
}

but on my NVidia Shield Tablet K1 (without sim card slot) context.getSystemService(Context.TELEPHONY_SERVICE) returns something and it looks like I have telephony service.

What is wrong with my code?

Answer 1

I would not assume that getSystemService() to retrieve the TelephonyManager would necessarily return null in this case.

The official way to check for telephony is to call hasSystemFeature(PackageManager.FEATURE_TELEPHONY) on a PackageManager , which you can get by calling getPackageManager() .

I have dusted off my NVIDIA Shield K1, and I get false from hasSystemFeature(PackageManager.FEATURE_TELEPHONY) on that device.