我知道现在回答有点晚了，但我在这里找到了这篇文章 ． 它很好地解释了整个过程，并为您提供了结构良好的代码。

Locale Helper类:

import android.annotation.TargetApi;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.res.Configuration;
import android.content.res.Resources;
import android.os.Build;
import android.preference.PreferenceManager;

import java.util.Locale;

/**
 * This class is used to change your application locale and persist this change for the next time
 * that your app is going to be used.
 * <p/>
 * You can also change the locale of your application on the fly by using the setLocale method.
 * <p/>
 * Created by gunhansancar on 07/10/15.
 */
public class LocaleHelper {

    private static final String SELECTED_LANGUAGE = "Locale.Helper.Selected.Language";

    public static Context onAttach(Context context) {
        String lang = getPersistedData(context, Locale.getDefault().getLanguage());
        return setLocale(context, lang);
    }

    public static Context onAttach(Context context, String defaultLanguage) {
        String lang = getPersistedData(context, defaultLanguage);
        return setLocale(context, lang);
    }

    public static String getLanguage(Context context) {
        return getPersistedData(context, Locale.getDefault().getLanguage());
    }

    public static Context setLocale(Context context, String language) {
        persist(context, language);

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
            return updateResources(context, language);
        }

        return updateResourcesLegacy(context, language);
    }

    private static String getPersistedData(Context context, String defaultLanguage) {
        SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
        return preferences.getString(SELECTED_LANGUAGE, defaultLanguage);
    }

    private static void persist(Context context, String language) {
        SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
        SharedPreferences.Editor editor = preferences.edit();

        editor.putString(SELECTED_LANGUAGE, language);
        editor.apply();
    }

    @TargetApi(Build.VERSION_CODES.N)
    private static Context updateResources(Context context, String language) {
        Locale locale = new Locale(language);
        Locale.setDefault(locale);

        Configuration configuration = context.getResources().getConfiguration();
        configuration.setLocale(locale);
        configuration.setLayoutDirection(locale);

        return context.createConfigurationContext(configuration);
    }

    @SuppressWarnings("deprecation")
    private static Context updateResourcesLegacy(Context context, String language) {
        Locale locale = new Locale(language);
        Locale.setDefault(locale);

        Resources resources = context.getResources();

        Configuration configuration = resources.getConfiguration();
        configuration.locale = locale;
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
            configuration.setLayoutDirection(locale);
        }

        resources.updateConfiguration(configuration, resources.getDisplayMetrics());

        return context;
    }
}

您需要重写attachBaseContext并调用LocaleHelper.onAttach()来初始化应用程序中的语言环境设置。

import android.app.Application;
import android.content.Context;

import com.gunhansancar.changelanguageexample.helper.LocaleHelper;

public class MainApplication extends Application {
    @Override
    protected void attachBaseContext(Context base) {
        super.attachBaseContext(LocaleHelper.onAttach(base, "en"));
    }
}

你所要做的就是相加

LocaleHelper.onCreate(this, "en");

只要你想改变locale。

这是有可能的。您可以设置区域。然而，我不建议这样做。我们在早期阶段尝试过，基本上是在对抗这个系统。

我们对改变语言有同样的要求，但决定接受UI应该与手机UI相同的事实。它是通过设置locale工作，但太bug了。根据我的经验，每次输入活动(每个活动)时都必须设置它。这里是一个代码，如果你仍然需要这个(再次强调，我不推荐)

Resources res = context.getResources();
// Change locale settings in the app.
DisplayMetrics dm = res.getDisplayMetrics();
android.content.res.Configuration conf = res.getConfiguration();
conf.setLocale(new Locale(language_code.toLowerCase())); // API 17+ only.
// Use conf.locale = new Locale(...) if targeting lower versions
res.updateConfiguration(conf, dm);

如果您有特定于语言的内容-您可以根据设置更改它。

2020年3月26日更新

    public static void setLocale(Activity activity, String languageCode) {
        Locale locale = new Locale(languageCode);
        Locale.setDefault(locale);
        Resources resources = activity.getResources();
        Configuration config = resources.getConfiguration();
        config.setLocale(locale);
        resources.updateConfiguration(config, resources.getDisplayMetrics());
    }

注意:语言代码不能有“-”，必须是2个小写字母

androidx。Appcompat: Appcompat用户，以上解决方案将在1.3.0版本后工作。 就像这里提到的。

这个功能是由谷歌为Android 13正式推出的(也有向后支持)。Android现在允许你为每个应用程序选择语言。

官方文件在这里- https://developer.android.com/guide/topics/resources/app-languages

要设置用户的首选语言，你会要求用户在语言选择器中选择一个地区，然后在系统中设置该值:

// 1. Inside an activity, in-app language picker gets an input locale "xx-YY"
// 2. App calls the API to set its locale
mContext.getSystemService(LocaleManager.class
    ).setApplicationLocales(newLocaleList(Locale.forLanguageTag("xx-YY")));
// 3. The system updates the locale and restarts the app, including any configuration updates
// 4. The app is now displayed in "xx-YY" language

要在语言选择器中显示用户当前的首选语言，你的应用程序可以从系统中获取返回的值:

// 1. App calls the API to get the preferred locale
LocaleList currentAppLocales =
    mContext.getSystemService(LocaleManager.class).getApplicationLocales();
// 2. App uses the returned LocaleList to display languages to the user

根据这篇文章。您需要下载那篇文章中引用的LocaleHelper.java。

Create MyApplication class that will extends Application Override attachBaseContext() to update language. Register this class in manifest. public class MyApplication extends Application { @Override protected void attachBaseContext(Context base) { super.attachBaseContext(LocaleHelper.onAttach(base, "en")); } } <application android:name="com.package.MyApplication" .../> Create BaseActivity and override onAttach() to update language. Needed for Android 6+ public class BaseActivity extends Activity { @Override protected void attachBaseContext(Context base) { super.attachBaseContext(LocaleHelper.onAttach(base)); } } Make all activities on your app extends from BaseActivity. public class LocaleHelper { private static final String SELECTED_LANGUAGE = "Locale.Helper.Selected.Language"; public static Context onAttach(Context context) { String lang = getPersistedData(context, Locale.getDefault().getLanguage()); return setLocale(context, lang); } public static Context onAttach(Context context, String defaultLanguage) { String lang = getPersistedData(context, defaultLanguage); return setLocale(context, lang); } public static String getLanguage(Context context) { return getPersistedData(context, Locale.getDefault().getLanguage()); } public static Context setLocale(Context context, String language) { persist(context, language); if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) { return updateResources(context, language); } return updateResourcesLegacy(context, language); } private static String getPersistedData(Context context, String defaultLanguage) { SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context); return preferences.getString(SELECTED_LANGUAGE, defaultLanguage); } private static void persist(Context context, String language) { SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context); SharedPreferences.Editor editor = preferences.edit(); editor.putString(SELECTED_LANGUAGE, language); editor.apply(); } @TargetApi(Build.VERSION_CODES.N) private static Context updateResources(Context context, String language) { Locale locale = new Locale(language); Locale.setDefault(locale); Configuration configuration = context.getResources().getConfiguration(); configuration.setLocale(locale); configuration.setLayoutDirection(locale); return context.createConfigurationContext(configuration); } @SuppressWarnings("deprecation") private static Context updateResourcesLegacy(Context context, String language) { Locale locale = new Locale(language); Locale.setDefault(locale); Resources resources = context.getResources(); Configuration configuration = resources.getConfiguration(); configuration.locale = locale; if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) { configuration.setLayoutDirection(locale); } resources.updateConfiguration(configuration, resources.getDisplayMetrics()); return context; } }

这是工作时，我按下按钮改变我的TextView的文本语言。(strings.xml在值-de文件夹)

String languageToLoad = "de"; // your language
Configuration config = getBaseContext().getResources().getConfiguration();
Locale locale = new Locale(languageToLoad);
Locale.setDefault(locale);
config.locale = locale;
getBaseContext().getResources().updateConfiguration(config, getBaseContext().getResources().getDisplayMetrics());
recreate();