Android支持国际化多语言那点事（支持8.0+）

public class MyApplication extends Application {
@Override
public void onCreate() {
  super.onCreate();
  languageWork();
}

@Override
public void onConfigurationChanged(Configuration newConfig) {
  super.onConfigurationChanged(newConfig);
  languageWork();
}

private void languageWork() {
  //自己写的工具包（如下）
  Locale locale = LanguageUtil.getLocale(this);
  LanguageUtil.updateLocale(this, locale);
}
}

public class LanguageUtil {
/**
 * 中文
 */
public static final Locale LOCALE_CHINESE = Locale.CHINESE;
/**
 * 英文
 */
public static final Locale LOCALE_ENGLISH = Locale.ENGLISH;
/**
 * 俄文
 */
public static final Locale LOCALE_RUSSIAN = new Locale("ru");

private static final String LOCALE_SP = "LOCALE_SP";
private static final String LOCALE_SP_KEY = "LOCALE_SP_KEY";

 public static Locale getLocale(Context context) {
  SharedPreferences spLocale = context.getSharedPreferences(LOCALE_SP, Context.MODE_PRIVATE);
  String localeJson = spLocale.getString(LOCALE_SP_KEY, "");
  Gson gson = new Gson();
  return gson.fromJson(localeJson, Locale.class);
}

pivate static void setLocale(Context pContext, Locale pUserLocale) {
  SharedPreferences spLocal = pContext.getSharedPreferences(LOCALE_SP, Context.MODE_PRIVATE);
  SharedPreferences.Editor edit = spLocal.edit();
  String json = new Gson().toJson(pUserLocale);
  edit.putString(LOCALE_SP_KEY, json);
  edit.apply();
}

public static boolean updateLocale(Context context, Locale locale) {
  if (needUpdateLocale(context, locale)) {
    Configuration cOnfiguration= context.getResources().getConfiguration();
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
      configuration.setLocale(locale);
    } else {
      configuration.locale = locale;
    }
    DisplayMetrics displayMetrics = context.getResources().getDisplayMetrics();
    context.getResources().updateConfiguration(configuration, displayMetrics);
    setLocale(context, locale);
    return true;
  }
  return false;
}

public static boolean needUpdateLocale(Context pContext, Locale newUserLocale) {
  return newUserLocale != null && !getCurrentLocale(pContext).equals(newUserLocale);
}
public static Locale getCurrentLocale(Context context) {
  Locale locale;
  if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) { //7.0有多语言设置获取顶部的语言
    locale = context.getResources().getConfiguration().getLocales().get(0);
  } else {
    locale = context.getResources().getConfiguration().locale;
  }
  return locale;
}
}

 public void onClick(View view) {
  boolean need = false;
  switch (view.getId()) {
    case R.id.chinese:
      need = LanguageUtil.updateLocale(this, LanguageUtil.LOCALE_CHINESE);
      if (need) {
        //自己写的常用activity管理工具
        ActivityManager.getInstance().recreateAllOtherActivity(this);
        Toast.makeText(this, "change to chinese", Toast.LENGTH_SHORT).show();
      } else {
        Toast.makeText(this, "no need", Toast.LENGTH_SHORT).show();
      }
      break;
    case R.id.english:
      need = LanguageUtil.updateLocale(this, LanguageUtil.LOCALE_ENGLISH);
      if (need) {
        ActivityManager.getInstance().recreateAllOtherActivity(this);
        Toast.makeText(this, "change to english", Toast.LENGTH_SHORT).show();
      } else {
        Toast.makeText(this, "no need", Toast.LENGTH_SHORT).show();
      }
      break;
    case R.id.russian:
      need = LanguageUtil.updateLocale(this, LanguageUtil.LOCALE_RUSSIAN);
      if (need) {
        ActivityManager.getInstance().recreateAllOtherActivity(this);
        Toast.makeText(this, "change to russian", Toast.LENGTH_SHORT).show();
      } else {
        Toast.makeText(this, "no need", Toast.LENGTH_SHORT).show();
      }
      break;
  }
}

 public class ActivityManager {
private static final Stack sActivityStack = new Stack<>();
private static ActivityManager sActivityManager;

private ActivityManager() {
}

public Stack getActivityStack() {
  return sActivityStack;
}

/**
 * 单一实例
 */
public static ActivityManager getInstance() {
  if (sActivityManager == null) {
    synchronized (ActivityManager.class) {
      sActivityManager = new ActivityManager();
    }
  }
  return sActivityManager;
}

/**
 * 添加Activity到堆栈
 */
public void addActivity(Activity activity) {
  sActivityStack.add(activity);
}

/**
 * 删除堆栈中的Activity
 */
public void removeActivity(Activity activity) {
  if (sActivityStack.isEmpty()) {
    return;
  }
  sActivityStack.remove(activity);
}

/**
 * 获取当前Activity（堆栈中最后一个压入的）
 */
public Activity currentActivity() {

  Activity activity = sActivityStack.lastElement();
  return activity;
}

/**
 * 结束当前Activity（堆栈中最后一个压入的）
 */
public void finishActivity() {
  Activity activity = sActivityStack.lastElement();
  finishActivity(activity);
}

/**
 * 结束指定的Activity
 */
public void finishActivity(Activity activity) {
  if (activity != null) {
    sActivityStack.remove(activity);
    activity.finish();
  }
}

/**
 * 结束指定类名的Activity
 */
public void finishActivity(Class<&＃63;> cls) {
  for (Activity activity : sActivityStack) {
    if (activity.getClass().equals(cls)) {
      finishActivity(activity);
      return;
    }
  }

}

//获取指定类名的Activity
public Activity getActivity(Class<&＃63;> cls) {
  for (Activity activity : sActivityStack) {
    if (activity.getClass().equals(cls)) {
      return activity;
    }
  }
  return null;
}

/**
 * 结束所有Activity
 */
public void finishAllActivity() {
  for (int i = 0, size = sActivityStack.size(); i 

@Override
protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  ActivityManager.getInstance().addActivity(this);
}

@Override
protected void onDestroy() {
  super.onDestroy();
  ActivityManager.getInstance().removeActivity(this);
}

 @Override
protected void attachBaseContext(Context newBase) {
  Context cOntext= languageWork(newBase);
  super.attachBaseContext(context);

 }

private Context languageWork(Context context) {
  // 8.0及以上使用createConfigurationContext设置configuration
  if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
    return updateResources(context);
  } else {
    return context;
  }
  }

@RequiresApi(api = Build.VERSION_CODES.O)
private Context updateResources(Context context) {
  Resources resources = context.getResources();
  Locale locale = LanguageUtil.getLocale(context);
  if (locale==null) {
    return context;
  }
  Configuration cOnfiguration= resources.getConfiguration();
  configuration.setLocale(locale);
  configuration.setLocales(new LocaleList(locale));
  return context.createConfigurationContext(configuration);
  }