Fragment cannot be converted to Context

From the Android docs on Fragments from here:

Caution: If you need a Context object within your Fragment, you can call getActivity(). However, be careful to call getActivity() only when the fragment is attached to an activity. When the fragment is not yet attached, or was detached during the end of its lifecycle, getActivity() will return null.

So, in addition to changing this to getActivity(), I also suggest that you work with getActivity() in onActivityCreated() (since you also need the view to be inflated first)

@Overridepublic void onActivityCreated(Bundle savedInstanceState) {    super.onActivityCreated(savedInstanceState);    if (getArguments() != null) {        mParam1 = getArguments().getString(ARG_PARAM1);        mParam2 = getArguments().getString(ARG_PARAM2);    }    Spinner hotkey_selector_spinner = (Spinner) getView().findViewById(R.id.hotkey_selector_spinner);    ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(getActivity(),            R.array.hotkey_options, android.R.layout.simple_spinner_item);    adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);    hotkey_selector_spinner.setAdapter(adapter);}

Change

ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this,        R.array.hotkey_options, android.R.layout.simple_spinner_item);

to

ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(getActivity(),        R.array.hotkey_options, android.R.layout.simple_spinner_item);

Access context in fragment by using getActivity()

Fragment can not be converted into Context, an Activity can.

So you should change

ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this,        R.array.hotkey_options, android.R.layout.simple_spinner_item);

to

ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(getActivity(),        R.array.hotkey_options, android.R.layout.simple_spinner_item);