java - fragment 数组中 "this"上的错误第一个参数类型错误

Question

当我意识到必须使用 fragment 而不是 Activity 才能在所有 Activity 中使用相同的导航菜单时，我几乎完成了我的应用程序，并在最后做导航菜单。所以现在，我目前正在复制、粘贴并使 Activity Java 在 fragment Java 中工作。在我的设置页面上，我有一个微调器，允许您选择一种语言。但是，部分代码中有一个我似乎无法弄清楚的错误。非常感谢所有帮助!谢谢!

package com.ezeapplications.quikflipfinal;


import android.content.Intent;
import android.content.res.Configuration;
import android.content.res.Resources;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.util.DisplayMetrics;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.Spinner;
import android.widget.Toast;

import java.util.Locale;
import java.util.Set;


/**
 * A simple {@link Fragment} subclass.
 */
public class SettingsFragment extends Fragment implements View.OnClickListener, AdapterView.OnItemSelectedListener {

    public SettingsFragment() {
        // Required empty public constructor
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_settings, container, false);
        Button settupdatebtn = (Button) view.findViewById(R.id.setting_update_btn);
        settupdatebtn.setOnClickListener(this);

        Spinner langspinner = (Spinner) view.findViewById(R.id.settings_language_spinner);
        // Create an ArrayAdapter using the string array and a default spinner layout
        ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(getActivity(),
                R.array.lang_array, android.R.layout.simple_spinner_item);
        // Specify the layout to use when the list of choices appears
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        // Apply the adapter to the spinner
        langspinner.setAdapter(adapter);
        return view;
    }

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

        Spinner langspinner = (Spinner) view.findViewById(R.id.settings_language_spinner);
        langspinner.setOnItemSelectedListener(this);

        if (pos == 1) {

            Toast.makeText(parent.getContext(),
                    "You Have Selected English!", Toast.LENGTH_SHORT)
                    .show();
            setLocale("en");
            SettingsFragment fragmenten = new SettingsFragment();
            android.support.v4.app.FragmentTransaction fragmentTransactionen =
                    getActivity().getSupportFragmentManager().beginTransaction();
            fragmentTransactionen.replace(R.id.fragment_container, fragmenten);
            fragmentTransactionen.commit();
            langspinner.setSelection(1);

        } else if (pos == 2) {

            Toast.makeText(parent.getContext(),
                    "Has Seleccionado Español!", Toast.LENGTH_SHORT)
                    .show();
            setLocale("es");
            SettingsFragment fragmentes = new SettingsFragment();
            android.support.v4.app.FragmentTransaction fragmentTransactiones =
                    getActivity().getSupportFragmentManager().beginTransaction();
            fragmentTransactiones.replace(R.id.fragment_container, fragmentes);
            fragmentTransactiones.commit();
            langspinner.setSelection(2);

        } else if (pos == 3) {

            Toast.makeText(parent.getContext(),
                    "Vous Avez Sélectionné Le Français!", Toast.LENGTH_SHORT)
                    .show();
            setLocale("fr");
            SettingsFragment fragmentfr = new SettingsFragment();
            android.support.v4.app.FragmentTransaction fragmentTransactionfr =
                    getActivity().getSupportFragmentManager().beginTransaction();
            fragmentTransactionfr.replace(R.id.fragment_container, fragmentfr);
            fragmentTransactionfr.commit();
            langspinner.setSelection(3);
        }
    }

    public void onNothingSelected(AdapterView<?> arg0) {
        // TODO Auto-generated method stub
    }


        @Override
                public void onClick (View v) {
            SettingsFragment fragment = new SettingsFragment();
            android.support.v4.app.FragmentTransaction fragmentTransaction =
                    getFragmentManager().beginTransaction();
            fragmentTransaction.replace(R.id.fragment_container,fragment);
            fragmentTransaction.commit();
            Toast.makeText(getActivity(), "Settings Updated!", Toast.LENGTH_SHORT).show();
        };

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);
        }

    }

Answer 1

您需要一个 Context 来从资源中创建 ArrayAdapter。 Fragment 类没有自己的上下文，而是取决于托管它的 Activity。因此，您需要传入 Fragment 所在的 Activity 的上下文。

这应该让你排序，

ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(getActivity(),
                R.array.lang_array, android.R.layout.simple_spinner_item);

希望这对您有所帮助，祝您编码愉快!