Android: Is there any way to turn on-off the physical keyboard programmatically?

Question

I have an android 3.1 with usb host capabilities. I connected to it via usb an RFID reader that works as a keyboard emulator. For keyboard emulator I mean that once I scan a tag

Answer 1

Have you got any editText or similar to get the focus this way?

someEditText.requestFocus();
InputMethodManager mgr = (InputMethodManager)getActivity(). 
getSystemService(Context.INPUT_METHOD_SERVICE);                 
mgr.showSoftInput(someEditText, InputMethodManager.SHOW_IMPLICIT);

I mean, if you do this after plugging your RFID reader, the keyboard should appear. Did you try this?