I'm trying to copy the answer in this question:
Use mock location without setting it in settings
But on my tests it only works for Lollipop and below.
Since 6.0 Marshmallow the mock location in the settings is now an app picker. And the code:
Settings.Secure.putInt(getContentResolver(),Settings.Secure.ALLOW_MOCK_LOCATION, 1);
Doesn't seem to do anything anymore in marshmallow.
It is possible because there are apps that can do this like com.incorporateapps.fakegps I don't know what trick they are doing to enable this in Android 6.0. Since there are no guides or any other info about this, only the link above.
