不同语言的字符串资源在 BottomNavigationBar 中不起作用

Question

我对我的应用程序使用一个活动多片段方法，并且我有一个底部导航栏，它嵌入在一个活动的 XML 布局文件中。 此外，我还有一个用于语言选择的片段（FR_LanguageSelection）。 基本上语言选择适用于我的所有片段，不幸的是，BottomNavigationBar 的字符串资源的语言（android:title = "@string/Language" 和 android:title = "@string/Back"）不会改变我在 FR_LanguageSelection 中选择了另一种语言，尽管 string-XML-File 中的资源存在。

现在我想问你是否知道在我在 FR_LanguageSelection 中选择另一种语言时，我在每个片段中调整了哪种语言，而 BottomNavigationBar 的语言保持不变？ 我会很感激每一条评论，并将非常感谢您的帮助。

在这里您可以看到 BottomNavigationBar 的 XML 文件

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">


    <item
        android:icon = "@drawable/ic_baseline_arrow_left_24"
        android:title = "@string/Back" />

    <item
        android:id="@+id/FR_LanguageSelection"
        android:icon = "@drawable/ic_add_circle_full"
        android:title = "@string/Language" />

    <item
        android:id="@+id/Fragment1"
        android:icon = "@drawable/ic_add_circle_full"
        android:title = "Fragment1" />

</menu>

这里可以看到选择语言FR_LanguageSelection的Fragment的Java文件：

package com.example.td.bapp;

import android.content.ContextWrapper;
import android.content.res.Configuration;
import android.os.Build;
import android.os.Bundle;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.annotation.RequiresApi;
import androidx.fragment.app.Fragment;
import androidx.navigation.Navigation;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.example.td.bapp.databinding.FragmentLanguageSelectionBinding;

import java.util.Locale;

/**

  Fragment for selecting the language of the app via ImageButtons
 *
 */

public class FR_LanguageSelection extends Fragment implements View.OnClickListener {



    /*
    String specifying the language of the App
     */
    public static String currentLanguageOfTheApp;
    public static final String LANGUAGE_GERMAN = "German";
    public static final String LANGUAGE_ENGLISH = "English";


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


    public static FR_LanguageSelection newInstance(String param1, String param2) {
        FR_LanguageSelection fragment = new FR_LanguageSelection();

        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

    }


    private FragmentLanguageSelectionBinding binding;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        binding = FragmentLanguageSelectionBinding.inflate(inflater, container, false);
        return binding.getRoot();
    }

    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        binding.imageButtonGermany.setOnClickListener(this);
        binding.imageButtonUK.setOnClickListener(this);
    }


    public void onDestroyView() {
        super.onDestroyView();
        binding = null;
    }

    @RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR1)
    @Override
    public void onClick(View view) {

        if(view.getId() == R.id.imageButtonGermany) {

             /*
            Set the language to "German" for other fragments and database queries
             */

            this.currentLanguageOfTheApp = LANGUAGE_GERMAN;



            /*
            Set the language to "German" for the XML-layout files
             */

            Locale locale;
            locale = new Locale("de", "DE");

            Configuration config = new Configuration(getActivity().getBaseContext().getResources().getConfiguration());
            Locale.setDefault(locale);
            config.setLocale(locale);

            getActivity().getBaseContext().getResources().updateConfiguration(config,
                    getActivity().getBaseContext().getResources().getDisplayMetrics());



            Navigation.findNavController(view).navigate
                    (FR_LanguageSelectionDirections.actionFRLanguageSelectionToFRMenu());


        }

        if(view.getId() == R.id.imageButtonUK) {

            /*
            Set the language to "English" for other fragments and database queries
             */

            this.currentLanguageOfTheApp = LANGUAGE_ENGLISH;


            /*
            Set the language to "English" for the XML-layout files
             */


            Locale locale;
            locale = new Locale("en", "EN");

            Configuration config = new Configuration(getActivity().getBaseContext().getResources().getConfiguration());
            Locale.setDefault(locale);
            config.setLocale(locale);

            getActivity().getBaseContext().getResources().updateConfiguration(config,
                    getActivity().getBaseContext().getResources().getDisplayMetrics());


            Navigation.findNavController(view).navigate(FR_LanguageSelectionDirections.actionFRLanguageSelectionToFRMenu());
        }

        }




}

提醒：知道如何解决这个问题吗？

Answer 1

尝试添加recreate()

public void onClick(View view) {
    ...
  recreate()
}

我想，您正在更新配置，但没有强制活动使用这些新配置。 调用recreate()应该触发 onConfiguration 更改事件并强制活动使用新配置。

Answer 2

每次切换语言时，清除并重新BottomNavigationView的menu ：

myBottomNavigation.getMenu().clear();
myBottomNavigation.inflateMenu(R.menu.my_bottom_nav_menu);