1.创建一个SharedPreferencesHelper类来保存当前应用程序使用的区域设置/语言。

public class SharedPreferencesHelper { private static final String SELECTED_LANGUAGE = "Locale.Helper.Selected.Language";

public static void setSelectedLanguage(Context context, String language) {
    SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
    preferences.edit().putString(SELECTED_LANGUAGE, language).apply();
}

public static String getSelectedLanguage(Context context) {
    SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
    return preferences.getString(SELECTED_LANGUAGE, "");
}

}

2.在应用程序的BaseActivity类中处理配置更改，包括更改语言和重启应用程序。

public abstract class BaseActivity extends AppCompatActivity { @Override protected void attachBaseContext(Context newBase) { super.attachBaseContext(LocaleHelper.onAttach(newBase)); }

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(getLayoutResourceId());
    //...
}

@Override
protected void onResume() {
    super.onResume();
    String language = SharedPreferencesHelper.getSelectedLanguage(this);
    if (!language.equals("")) {
        LocaleHelper.setLocale(this, language);
        recreate();
    }
}

}

3.创建一个LocaleHelper类来处理语言更改和保存当前语言设置。

public class LocaleHelper { private static final String SELECTED_LANGUAGE = "Locale.Helper.Selected.Language";

public static Context onAttach(Context context) {
    String language = SharedPreferencesHelper.getSelectedLanguage(context);
    return setLocale(context, language);
}

public static Context setLocale(Context context, String language) {
    SharedPreferencesHelper.setSelectedLanguage(context, language);
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
        return updateResources(context, language);
    }
    return updateResourcesLegacy(context, language);
}

@TargetApi(Build.VERSION_CODES.N)
private static Context updateResources(Context context, String language) {
    Locale locale = new Locale(language);
    Configuration configuration = context.getResources().getConfiguration();
    configuration.setLocale(locale);
    return context.createConfigurationContext(configuration);
}

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