I am trying to get supported shutter speed parameters but I am now sure how to get those ranges.
For ISO-values
String supportedIsoValues = camParams.get(\"i
Even "iso-values" is not part of the standard Android camera API - it's a (common) vendor extension, and can't be relied on to be present.
There's no official support for either ISO or exposure time control in the old, deprecated camera API. You need to move to camera2 for that, and check that the device supports capability MANUAL_SENSOR.
Then you can disable AE, and manually control exposure time, frame duration, and ISO sensitivity.