cannot cast Integer to Float

Question

I want to store a float variable as SharedPreferences in my fragment. So I try to set it up and edit it later, but I get an error in the line verbrauch = prefsver.getFloat("key", 0); that the Integer cannot be cast to a Float variable, although I thought I‘m not even using an int there. Am I storing it a wrong way?

My code, it’s just a snipped so I hope I didn’t cut anything relevant:

public class ItemThreeFragment extends Fragment {

    TextView textView11;
    float verbrauch;

    public static ItemThreeFragment newInstance() {
        ItemThreeFragment fragment = new ItemThreeFragment();
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {

        final View view = inflater.inflate(R.layout.fragment_item_three, container, false);

        SharedPreferences prefsver = getActivity().getBaseContext().getSharedPreferences("myPrefsKeyv",
                Context.MODE_PRIVATE);
        verbrauch = prefsver.getFloat("key",0);

        Button button = (Button) view.findViewById(R.id.button);

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

        final EditText et = (EditText) getActivity().findViewById(R.id.editText);
                String str = et.getText().toString();

        verbrauch = Float.valueOf(str);

                SharedPreferences prefsver = getActivity().getSharedPreferences("myPrefsKeyv",
                        Context.MODE_PRIVATE);
                prefsver.edit().putFloat("key", verbrauch)
                        .apply();
            }
        });
}

Try to remove even more stuff, thus isolate the code which produces the exception. And please do not use German, not even as names of variables... Try to create the minimum code which produces the same error. You may then find yourself where your problem is. — Honza Zidek
– Honza Zidek, Commented Jun 11, 2018 at 14:48

Luke · Accepted Answer · 2018-06-11 19:51:13Z

2

0 is an int literal - not a float. Use 0f (with a suffix), or cast explicitly as (float)0.

Edit:

Also check whether you're actually storing a float, e.g. there could be some leftover value. The method will try to cast what is stored in prefs as float, and in case the cast doesn't succeed, it throws ClassCastException.

edited Jun 11, 2018 at 19:51

answered Jun 11, 2018 at 14:34

Luke

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4 Comments

user9582784 Over a year ago

Without the f it is recognized as a double, but even like 0.0fI still get the error

Luke Over a year ago

Right, my bad. Though ClassCastException is a bit unusual if you're not using preference screen. Are you sure what's stored inside is actually a float (e.g. check the value using the debugger)?

user9582784 Over a year ago

I think I got it, you gave me the right hint! The last saved value wasn’t a float indeed. Thank you!

Luke Over a year ago

Glad it helped - let me edit my answer to put that advice in.

Headcracker · Accepted Answer · 2018-06-11 14:33:25Z

1

verbrauch = prefsver.getFloat("key",0F); would be correct. Note the F after the 0 that makes it a float.

answered Jun 11, 2018 at 14:33

Headcracker

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1 Comment

user9582784 Over a year ago

I tried it, I thought of that too but my compiler still returns a ClassCastException

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