Android多语言那点事(支持8.0+)

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

Android多语言那点事(支持8.0+)_第1张图片
multilanguage.gif

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


Android多语言那点事(支持8.0+)_第2张图片
a.png

选择Language,以及地区(any region)即可


Android多语言那点事(支持8.0+)_第3张图片
b.png

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);
}


private 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 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 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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