我终于弄清楚如何设置它工作在两个=N安卓版本。

用你自己的抽象类扩展AppCompatActivity，比如:

abstract class MLAppCompatActivity : AppCompatActivity() {
  override fun attachBaseContext(newBase: Context?) {
    super.attachBaseContext(LocaleHelper.wrap(newBase))
  }

  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.N) {
        LocaleHelper.wrap(this)
    }
  }
}

attachBaseContext在Android >=N版本上被调用，这样activity将使用正确的上下文。在Android <N上，我们必须以另一种方式调用这个函数，在设置内容视图之前。因此，我们重写onCreate函数来设置正确的上下文。 意思是，每当你创建一个新的Activity时，你必须扩展你的抽象类。比如这个:

class TermsActivity : MLAppCompatActivity() {
  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_terms)
  }
}

最后LocaleHelper是这样的:

import android.annotation.TargetApi;
import android.content.Context;
import android.content.ContextWrapper;
import android.content.SharedPreferences;
import android.content.res.Configuration;
import android.content.res.Resources;
import android.os.Build;
import android.util.DisplayMetrics;

import com.at_zone.constants.SharedPreferencesKeys;

import java.util.Locale;

public class LocaleHelper extends ContextWrapper {

    public LocaleHelper(Context base) {
        super(base);
    }

    public static Context wrap(Context context) {
        SharedPreferences sharedPreferences = context.getSharedPreferences(
                SharedPreferencesKeys.SHARED_PREFERENCES, Context.MODE_PRIVATE
        );
        String language = sharedPreferences.getString(SharedPreferencesKeys.CURRENT_LANGUAGE, "default");
        if (!language.equals("default")) {
            Configuration config = context.getResources().getConfiguration();
            if (!language.equals("")) {
                Locale locale = new Locale(language);
                Locale.setDefault(locale);
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
                    setSystemLocale(config, locale);
                } else {
                    setSystemLocaleLegacy(context, config, locale);
                }
                config.setLayoutDirection(locale);
                context = context.createConfigurationContext(config);
            }
            return new LocaleHelper(context);
        }
        return context;
    }

    public static String getSystemLanguage(Context context) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
            return getSystemLocale(context).getLanguage().toLowerCase();
        } else {
            return getSystemLocaleLegacy(context).getLanguage().toLowerCase();
        }
    }

    public static Locale getSystemLocaleLegacy(Context context) {
        Configuration config = context.getResources().getConfiguration();
        return config.locale;
    }

    @TargetApi(Build.VERSION_CODES.N)
    public static Locale getSystemLocale(Context context) {
        return context.getResources().getConfiguration().getLocales().get(0);
    }

    public static void setSystemLocaleLegacy(Context context, Configuration config, Locale locale) {
        config.locale = locale;
        Resources res = context.getResources();
        DisplayMetrics dm = res.getDisplayMetrics();
        res.updateConfiguration(config, dm);
    }

    @TargetApi(Build.VERSION_CODES.N)
    public static void setSystemLocale(Configuration config, Locale locale) {
        config.setLocale(locale);
    }

}

创建一个类Extends Application并创建一个静态方法。 然后你可以在setContentView()之前的所有活动中调用这个方法。

public class MyApp extends Application {

@Override
public void onCreate() {
    super.onCreate();
}

public static void setLocaleFa (Context context){
    Locale locale = new Locale("fa"); 
    Locale.setDefault(locale);
    Configuration config = new Configuration();
    config.locale = locale;
    context.getApplicationContext().getResources().updateConfiguration(config, null);
}

public static void setLocaleEn (Context context){
    Locale locale = new Locale("en_US"); 
    Locale.setDefault(locale);
    Configuration config = new Configuration();
    config.locale = locale;
    context.getApplicationContext().getResources().updateConfiguration(config, null);
}

}

在活动中的使用:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    MyApp.setLocaleFa(MainActivity.this);
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    setContentView(R.layout.activity_main);
}

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。

唯一完全适合我的解决方案是结合Alex Volovoy的代码和应用程序重启机制:

void restartApplication() {
    Intent i = new Intent(MainTabActivity.context, MagicAppRestart.class);
    i.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
    i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    MainTabActivity.context.startActivity(i);
}


/** This activity shows nothing; instead, it restarts the android process */
public class MagicAppRestart extends Activity {
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        finish();
    }

    protected void onResume() {
        super.onResume();
        startActivityForResult(new Intent(this, MainTabActivity.class), 0);         
    }
}

在运行每个Activity时，必须对attachBaseContext函数进行这些更改。

public Context createConfiguration(Context context, String lan) {
    Locale locale = new Locale(lan);
    Configuration configuration = new Configuration(context.getResources().getConfiguration());
    configuration.setLocale(locale);
    return context.createConfigurationContext(configuration);
}

@Override
protected void attachBaseContext(Context newBase) {
    super.attachBaseContext(createConfiguration(newBase, "en"/*LANGUAGE_SELECTED*/)));
}

同样，对于您所在的活动，在更改语言后，调用函数recrere ();

Locale locale = new Locale("en");
Locale.setDefault(locale);

Configuration config = context.getResources().getConfiguration();
config.setLocale(locale);
context.createConfigurationContext(config);

重要更新:

context.getResources().updateConfiguration(config, context.getResources().getDisplayMetrics());

注意，在SDK >= 21上，你需要调用' resources . updateconfiguration()'，否则资源将不会被更新。