java - 如何制作改变应用程序语言的微调器(在 fragment 中)？

Question

当我意识到我需要使用 fragment 而不是 Activity 以便在所有屏幕上共享相同的导航菜单时，我的应用程序几乎完全完成，所以现在我正在制作我所有 Activity 的 Java 代码 fragment 化地工作。我似乎无法弄清楚的一个问题是更改语言的微调器。我制作并翻译了英语(默认)、西类牙语 (ES) 和法语 (FR) 字符串。当有人在微调器上选择西类牙语时，我希望它将应用程序的区域设置更改为西类牙语 (es) 并 toast 说语言已更改为西类牙语!等。为此，它必须重新启动 fragment ，对吗？那么从设置 fragment 开始设置 fragment 以便语言更新？现在，当我从微调器中选择一个选项时，我可以看到我在微调器上选择了它，但没有任何反应。没有 toast ，没有语言，没有 fragment 刷新等。非常感谢所有帮助!谢谢!!我将在下面发布代码!

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.support.v4.app.FragmentTransaction;
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();
        };

    Locale myLocale;
    public void setLocale(String lang) {
        myLocale = new Locale(lang);
        Locale.setDefault(myLocale);
        Resources res = getResources();
        DisplayMetrics dm = res.getDisplayMetrics();
        Configuration conf = res.getConfiguration();
        conf.locale = myLocale;
        res.updateConfiguration(conf, dm);
        refresh();


}

public void refresh() {
    Fragment currentFragment = getFragmentManager().findFragmentByTag("fragment_tag_String");
    FragmentTransaction fragTransaction = getFragmentManager().beginTransaction();
    fragTransaction.detach(currentFragment);
    fragTransaction.attach(currentFragment);
    fragTransaction.commit();

}

    }

Answer 1

试试这个:

public class SettingsFragment extends Fragment implements View.OnClickListener, AdapterView.OnItemSelectedListener {

    Spinner langspinner;

    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);

        langspinner = (Spinner) view.findViewById(R.id.settings_language_spinner);
        langspinner.setOnItemSelectedListener(this);
        // 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);
        langspinner.setSelection(0, false);
        return view;
    }

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

        if (pos == 1) {

            Toast.makeText(parent.getContext(),
                    "You Have Selected English!", Toast.LENGTH_SHORT)
                    .show();
            setLocale("en");
            langspinner.setSelection(1);

        } else if (pos == 2) {

            Toast.makeText(parent.getContext(),
                    "Has Seleccionado Español!", Toast.LENGTH_SHORT)
                    .show();
            setLocale("es");
            langspinner.setSelection(2);

        } else if (pos == 3) {

            Toast.makeText(parent.getContext(),
                    "Vous Avez Sélectionné Le Français!", Toast.LENGTH_SHORT)
                    .show();
            setLocale("fr");
            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();
    }


    Locale myLocale;

    public void setLocale(String lang) {
        myLocale = new Locale(lang);
        Locale.setDefault(myLocale);
        Resources res = getResources();
        DisplayMetrics dm = res.getDisplayMetrics();
        Configuration conf = res.getConfiguration();
        conf.locale = myLocale;
        res.updateConfiguration(conf, dm);
        refresh();


    }

    public void refresh() {
        Fragment currentFragment = getFragmentManager().findFragmentByTag("fragment_tag_String");
        FragmentTransaction fragTransaction = getFragmentManager().beginTransaction();
        fragTransaction.detach(currentFragment);
        fragTransaction.attach(currentFragment);
        fragTransaction.commit();

    }

}

确保当您从activity 加载SettingsFragment 时添加Fragment 标签

像这样；

 SettingsFragment fragmentA = new SettingsFragment();
getSupportFragmentManager().beginTransaction()
    .replace(R.id.MainFrameLayout,fragmentA,"fragment_tag_String")
    .addToBackStack(null).commit();