Delete sharedpreferences on click button fragment - android-fragments

Question

I wanted delete or reset value 0 once user click on reset button ,
here is code which i am using , but seem not be work ..
What wrong I am doing , i am not able to figure out , ..I also tried all way , using google to figure it out , but still stuck.
sharedPreferences = getActivity().getPreferences(1);
sharedPreferences.edit().remove("ccs11").commit();
sharedPreferences.edit().remove("spinner_paneer").commit();
Below is my fragment , on which i am trying to implement .
public PlanFragment() {
// Required empty public constructor
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_gain, container, false);
sharedPreferences = getActivity().getPreferences(1);
String cp1s11=sharedPreferences.getString("cp111", "0");
String cf1s11=sharedPreferences.getString("cf111", "0");
String ccs11=sharedPreferences.getString("cc111", "0");
//Button
btnfinish=(Button)rootView.findViewById(R.id.finish_gain);
btnfinish.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
sharedPreferences = getActivity().getPreferences(1);
edt = sharedPreferences.edit();
edt.putString("ccs11", pro11.getText().toString());
edt.apply();
Intent intent = new Intent(getActivity(), MainActivity.class);
getActivity().startActivity(intent);
}
});
btnreset=(Button)rootView.findViewById(R.id.reset);
btnreset.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
sharedPreferences = getActivity().getPreferences(1);
sharedPreferences.edit().remove("ccs11").commit();
sharedPreferences.edit().remove("spinner_paneer").commit();
}
});
return rootView;
}
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
}
#Override
public void onDetach() {
super.onDetach();
}
}