Question

我编辑了我使用的最后一个代码和Krunal的答案。当我选择一个具有监听器的微调器项时，我仍然会崩溃。

我希望片段中的微调器能够让用户能够更改语言。

然而，当用户更改语言时，应用程序崩溃......所以问题应该来自我的微调器的监听器。我的微调器有效地显示了不同的项目

以下是代码：

public class GreetingsFragment extends Fragment {

public GreetingsFragment(){}
private Spinner spinner1 ;
Context thiscontext;

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

    thiscontext = container.getContext();
    View rootView = inflater.inflate(R.layout.fragment_greetings, container, false);

    setSpinnerContent( rootView );

spinner1.setOnItemSelectedListener(new OnItemSelectedListener() {

        @Override
        public void onItemSelected(AdapterView<?> id, View rootView,
                int pos, long arg3) {

                    if (pos == 1) {

                        Toast.makeText(getActivity().getApplicationContext(),
                                "You have selected Spanish", Toast.LENGTH_SHORT)
                                .show();
                        setLocale("sp");
                    } else if (pos == 2) {

                        Toast.makeText(getActivity().getApplicationContext(),
                                "You have selected Japanese", Toast.LENGTH_SHORT)
                                .show();
                        setLocale("jp");
                    } else if (pos == 3) {

                        Toast.makeText(getActivity().getApplicationContext(),
                                "You have selected German", Toast.LENGTH_SHORT)
                                .show();
                        setLocale("de");
                    }

                }

         @Override
         public void onNothingSelected(AdapterView<?> arg0) {
             // TODO Auto-generated method stub
             Toast.makeText(getActivity().getApplicationContext(), "Nothing to select", Toast.LENGTH_LONG).show();
         }

            });


    return rootView;

}

 private void setSpinnerContent( View rootView )
    {
      spinner1 = (Spinner) rootView.findViewById( R.id.languages_spinner );
      ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(getActivity(), R.array.LANG, android.R.layout.simple_spinner_item);
      adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
      spinner1.setAdapter( adapter );
    }


public void setLocale(String lang) {

    Locale myLocale = new Locale(lang);
    Resources res = getResources();
    DisplayMetrics dm = res.getDisplayMetrics();
    Configuration conf = res.getConfiguration();
    conf.locale = myLocale;
    res.updateConfiguration(conf, dm);
    Intent refresh = new Intent(getActivity(), GreetingsFragment.class);
    refresh.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
    startActivity(refresh);
}

}

Answer 1

据我所知，旋转器位置从0开始，而不是1，

你试试这个。

spinner.setOnItemSelectedListener(new OnItemSelectedListener() {

        @Override
        public void onItemSelected(AdapterView<?> arg0, View arg1,
                int arg2, long arg3) {
            // TODO Auto-generated method stub
 if (pos == 0) {

                    Toast.makeText(getActivity().getApplicationContext(),
                            "You have selected Spanish", Toast.LENGTH_SHORT)
                            .show();
                    setLocale("sp");
                } else if (pos == 1) {

                    Toast.makeText(getActivity().getApplicationContext(),
                            "You have selected Japanese", Toast.LENGTH_SHORT)
                            .show();
                    setLocale("jp");
                } else if (pos == 2) {

                    Toast.makeText(getActivity().getApplicationContext(),
                            "You have selected German", Toast.LENGTH_SHORT)
                            .show();
                    setLocale("de");
                }
        }

        @Override
        public void onNothingSelected(AdapterView<?> arg0) {
            // TODO Auto-generated method stub
            Toast.makeText(getApplicationContext(), "Nothing to select", Toast.LENGTH_LONG).show();
        }
    });

第二件事是你试图将片段转换为活动，所以你得到了这个bug，请尝试此代码，它将解决您的错误。

微分器在片段内的定位

1 个答案: