片段中编辑文本上的空指针异常

Question

我正在构建一个注册页面，我想要一个日期选择器，但是每当我单击用户Fragment打开注册页面时，应用程序就会崩溃，并且错误nullPointerExceptionEditText。请帮我解决它。

这是UserFragment.java守则

public class UserFragment extends Fragment {
public EditText et_Date;
public static final int REQUEST_CODE = 11;
String selectedDate;
private OnFragmentInteractionListener mListener;
public DatePickerDialog.OnDateSetListener setListener;
View view;
public UserFragment() {
}
public static UserFragment newInstance() {
UserFragment fragment = new UserFragment();
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
view = inflater.inflate(R.layout.adduser_fragment, container, false);
et_Date  = (EditText) view.findViewById(R.id.etdate);
final FragmentManager fm = ((AppCompatActivity)getActivity()).getSupportFragmentManager();
et_Date.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
AppCompatDialogFragment newFragment = new DatePickerFragment();
newFragment.setTargetFragment(UserFragment.this,REQUEST_CODE);
newFragment.show(fm, "DatePicker");
}
});
return view;
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if(requestCode == REQUEST_CODE && resultCode == Activity.RESULT_OK){
selectedDate = data.getStringExtra("SelectedDate");
et_Date.setText(selectedDate);
}
}
@Override
public void onAttach(Context context) {
super.onAttach(context);
if(context instanceof OnFragmentInteractionListener){
mListener= (OnFragmentInteractionListener) context;
}else{
throw new RuntimeException(context.toString()+"must implement OnFragmentInterationListener");
}
}
@Override
public void onDetach() {
super.onDetach();
mListener = null;
}
public interface OnFragmentInteractionListener {
public void onFragmentInteraction(Uri uri);
}
}

Answer 1

你的 editText 与 id etdate 实际上是在布局adduser_fragment？此错误可能是因为视图在另一个布局中(您忘记了(。抱歉回答，我没有足够的声誉发表评论。