"setAdapter" with Spinners in fragment is not working

Question

I am trying to implement spinners, and at the Line

spinner1.setAdapter(adapter1);

I get the following error:

java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Spinner.setAdapter(android.widget.SpinnerAdapter)' on a null object reference

This is my Code:

public class Temp extends Fragment implements AdapterView.OnItemSelectedListener{
    private static final String[] paths1 = {"sam1", "sam2", "sam3", "sam4"},
            paths2 = {"1", "2", "3", "4"};
    private String name,seq;
    private Spinner spinner1,spinner2;
    private TextView tv1;
    private ArrayAdapter<String> adapter1,adapter2;

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container,
                             @Nullable Bundle savedInstanceState) {
        View attendFragView = inflater.inflate(R.layout.fragment_attendance, container, false);

        //Spinner 1 code
        spinner1=(Spinner)attendFragView.findViewById(R.id.regPageFacSpinner1);
        adapter1=new ArrayAdapter<String>(attendFragView.getContext(),R.layout.spinner_lay_notched,
                paths2);
        adapter1.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        spinner1.setAdapter(adapter1);
        spinner1.setOnItemSelectedListener(this);

        //Spinner 2 Code

        spinner2=(Spinner)attendFragView.findViewById(R.id.regPageFacSpinner2);
        adapter2=new ArrayAdapter<String>(attendFragView.getContext(),R.layout.spinner_lay_notched,
                paths1);
        adapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        spinner2.setAdapter(adapter2);
        spinner2.setOnItemSelectedListener(this);


        final EditText et1 = (EditText) attendFragView.findViewById(R.id.secOtpFac);
        tv1=(TextView)attendFragView.findViewById(R.id.attendPageFac5);

        Button genOtp = (Button) attendFragView.findViewById(R.id.otpGenButFac);
        genOtp.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                String dept= et1.getText().toString();
                String name=spinner1.getSelectedItem().toString();
                String seq=spinner2.getSelectedItem().toString();
                JSONObject attendJSONSend = new JSONObject();
                try {
                    attendJSONSend.put("name", name);
                    attendJSONSend.put("seq", seq);
                    attendJSONSend.put("dept", dept);
                } catch (JSONException e) {
                    e.printStackTrace();
                }
            }
        });
        return attendFragView;
    }

    @Override
    public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {

    }

    @Override
    public void onNothingSelected(AdapterView<?> adapterView) {

    }
}

Try change `new ArrayAdapter(attendFragView.getContext(),R.layout.spinner_lay_notched, paths2);` to `new ArrayAdapter(getActivity(),R.layout.spinner_lay_notched, paths2);` — Augusto, Dec 19 '18 at 13:05
Are you sure that the Spinner with the `regPageFacSpinner1` id is inside the `fragment_attendance` layout? — Mauker, Dec 19 '18 at 13:23

score 2 · Accepted Answer · edited Dec 19 '18 at 13:38

2

As the Exception says , spinner1 is null because the compiler try to use setAdapter on a null Object.

Recommendation in order to fix this problem. (as I faced it a lot).

Check your layout and make sure that your view ids are correct in your code and inside the XML layout file.
Android Studio Will save your created view ids although you might removed them before. Try to Clean/Rebuild.
And more specifically the problem is on this id: R.id.regPageFacSpinner1.

Good luck.

edited Dec 19 '18 at 13:38

Mauker

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answered Dec 19 '18 at 13:32

A Farmanbar

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1

I dig that last line. Luck is indeed needed for Android development sometimes. – Mauker Dec 19 '18 at 13:35
@Mauker thanks for edit. – A Farmanbar Dec 19 '18 at 16:15
You're welcome! – Mauker Dec 19 '18 at 17:29

"setAdapter" with Spinners in fragment is not working

1 Answers1