我可以在Android上检测物理磁场传感器还是虚拟磁场传感器？

Question

The 'Moto E' devices do not have magnetic field sensors. Yet they seem to emulate it using GPS. But of course that only really works if you are moving. I would prefer to know that it is doing that, so I could disable some functions, or warn the user.

I can't seem to find a way of doing it like you can with many other devices, because the sensor 'exists' even if emulated.

For that matter, this model also has no gyroscope. Yet FusedSensors seem to work pretty well (although maybe not as well as on other devices).

Thanks for any input! Dave

Answer 1

The idea of using: <uses-feature android:name="android.hardware.sensor.compass" android:required="true" />

in the manifest did not seem to have any effect at all.

However the following code did in fact work!

PackageManager manager = getPackageManager();
boolean hasCompass = manager.hasSystemFeature(PackageManager.FEATURE_SENSOR_COMPASS);
if (!hasCompass)
{
    Toast toast = Toast.makeText(this, "WARNING: DEVICE HAS NO COMPASS", Toast.LENGTH_LONG);
    toast.show();
}

I want to give credit for this to pointtofuture in the post [question]: How to make sure an android device application supports hardware feature

I should note that I tried this on the 'Moto E 2nd Gen' (No compass), and a Samsung Galaxy S7 Edge (has compass) and it was consistent. The AndroidStudio emulators all showed as having a compass, but the emulator setup does not allow selection or de-selection of that hardware feature (It does for GPS and some others). It would be nice if the emulators had compass emulation.

Dave