Android 多语言 Android支持国际化多语言那点事(支持8.0+)

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Android 多语言 Android支持国际化多语言那点事(支持8.0+)

Allen___   2021-03-31 我要评论

起因

我们在开发app可能会拓展国外市场,那么对包含英语在内的其它语言支持就很有必要了。

效果


思路

一:添加相关资源文件,并引用。
二:设置configuration,configuration里面指定语言类型。
三:在需要时候更换configuration即可。

实现

在res的values文件夹下新建相关语言类型的资源文件

右键新建资源文件,选择Locale,点击 >> 按钮

选择Language,以及地区(any region)即可


最后 文件名字和其他语言文件名字一样,strings即可。

在MyApplication里面的onCreate和onConfigurationChanged方法里面添加语言相关处理(onConfigurationChanged是为了处理横竖屏切换问题),给应用上下文对象添加configuration,configuration里面指定了当前语言。

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);
}
}

LanguageUtil如下(没整理过的小伙伴直接用即可),为了保证语言从A切换到B,在之后启动应用依旧使用B语言,我们需要将B语言存入本地。下次启动应用,设置即可。

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;
}
}

进行切换,主要触发动作是activity的recreate()(切换使用新的configuration)。所有的activity在activityManager里面进行管理。只需将其他(除了当前语言选择activity)的所有activity进行recreate(),即可。languageUtil同时进行了是否需要切换语言的判定。如果当前语言和要选择的一致,则无需再做处理)

 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;
  }
}

ActivityManager如下

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

private ActivityManager() {
}

public Stack<Activity> 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<?> 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<?> 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 < size; i++) {
    if (null != sActivityStack.get(i)) {
      sActivityStack.get(i).finish();
    }
  }
  sActivityStack.clear();
}

public void finishAllOtherActivity(Activity activity) {
  for (int i = 0, size = sActivityStack.size(); i < size; i++) {
    if (null != sActivityStack.get(i) && sActivityStack.get(i) != activity) {
      sActivityStack.get(i).finish();
    }
  }
  sActivityStack.clear();
}

public void recreateAllOtherActivity(Activity activity) {
  for (int i = 0, size = sActivityStack.size(); i < size; i++) {
    if (null != sActivityStack.get(i) && sActivityStack.get(i) != activity) {
      sActivityStack.get(i).recreate();
    }
  }
}

/**
 * 退出应用程序
 */
public void AppExit() {
  try {
    finishAllActivity();
    System.exit(0);
  } catch (Exception e) {
  }
  }
  }

将app的所有acitivity进行添加和移除,可以在BaseActivity里面进行。

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

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

以上步骤,我们的语言切换算是完成了。但是,在API 26+以上版本,我们需要额外添加如下代码做兼容,没啥说的,SDK变动而已,跟着SDK走咯~(在activity或者BaseActivity添加)

 @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);
  }

完工~

地址:https://github.com/HoldMyOwn/MultiLanguage

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