起因
我們?cè)陂_(kāi)發(fā)app可能會(huì)拓展國(guó)外市場(chǎng)，那么對(duì)包含英語(yǔ)在內(nèi)的其它語(yǔ)言支持就很有必要了。
效果
思路
一：添加相關(guān)資源文件，并引用。
二：設(shè)置configuration，configuration里面指定語(yǔ)言類型。
三：在需要時(shí)候更換configuration即可。
實(shí)現(xiàn)
在res的values文件夾下新建相關(guān)語(yǔ)言類型的資源文件
右鍵新建資源文件，選擇Locale，點(diǎn)擊 >> 按鈕
選擇Language，以及地區(qū)（any region）即可
最后 文件名字和其他語(yǔ)言文件名字一樣，strings即可。
在MyApplication里面的onCreate和onConfigurationChanged方法里面添加語(yǔ)言相關(guān)處理（onConfigurationChanged是為了處理橫豎屏切換問(wèn)題），給應(yīng)用上下文對(duì)象添加configuration，configuration里面指定了當(dāng)前語(yǔ)言。
public class MyApplication extends Application {@Overridepublic void onCreate() { super.onCreate(); languageWork();}@Overridepublic void onConfigurationChanged(Configuration newConfig) { super.onConfigurationChanged(newConfig); languageWork();}private void languageWork() { //自己寫的工具包（如下） Locale locale = LanguageUtil.getLocale(this); LanguageUtil.updateLocale(this, locale);}}LanguageUtil如下（沒(méi)整理過(guò)的小伙伴直接用即可），為了保證語(yǔ)言從A切換到B，在之后啟動(dòng)應(yīng)用依舊使用B語(yǔ)言，我們需要將B語(yǔ)言存入本地。下次啟動(dòng)應(yīng)用，設(shè)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有多語(yǔ)言設(shè)置獲取頂部的語(yǔ)言 locale = context.getResources().getConfiguration().getLocales().get(0); } else { locale = context.getResources().getConfiguration().locale; } return locale;}}進(jìn)行切換，主要觸發(fā)動(dòng)作是activity的recreate()（切換使用新的configuration）。所有的activity在activityManager里面進(jìn)行管理。只需將其他（除了當(dāng)前語(yǔ)言選擇activity）的所有activity進(jìn)行recreate()，即可。languageUtil同時(shí)進(jìn)行了是否需要切換語(yǔ)言的判定。如果當(dāng)前語(yǔ)言和要選擇的一致，則無(wú)需再做處理）
public void onClick(View view) { boolean need = false; switch (view.getId()) { case R.id.chinese: need = LanguageUtil.updateLocale(this, LanguageUtil.LOCALE_CHINESE); if (need) { //自己寫的常用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;}/** * 單一實(shí)例 */public static ActivityManager getInstance() { if (sActivityManager == null) { synchronized (ActivityManager.class) { sActivityManager = new ActivityManager(); } } return sActivityManager;}/** * 添加Activity到堆棧 */public void addActivity(Activity activity) { sActivityStack.add(activity);}/** * 刪除堆棧中的Activity */public void removeActivity(Activity activity) { if (sActivityStack.isEmpty()) { return; } sActivityStack.remove(activity);}/** * 獲取當(dāng)前Activity（堆棧中最后一個(gè)壓入的） */public Activity currentActivity() { Activity activity = sActivityStack.lastElement(); return activity;}/** * 結(jié)束當(dāng)前Activity（堆棧中最后一個(gè)壓入的） */public void finishActivity() { Activity activity = sActivityStack.lastElement(); finishActivity(activity);}/** * 結(jié)束指定的Activity */public void finishActivity(Activity activity) { if (activity != null) { sActivityStack.remove(activity); activity.finish(); }}/** * 結(jié)束指定類名的Activity */public void finishActivity(Class<?> cls) { for (Activity activity : sActivityStack) { if (activity.getClass().equals(cls)) { finishActivity(activity); return; } }}//獲取指定類名的Activitypublic Activity getActivity(Class<?> cls) { for (Activity activity : sActivityStack) { if (activity.getClass().equals(cls)) { return activity; } } return null;}/** * 結(jié)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(); } }}/** * 退出應(yīng)用程序 */public void AppExit() { try { finishAllActivity(); System.exit(0); } catch (Exception e) { } } }將app的所有acitivity進(jìn)行添加和移除，可以在BaseActivity里面進(jìn)行。
@Overrideprotected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); ActivityManager.getInstance().addActivity(this);}@Overrideprotected void onDestroy() { super.onDestroy(); ActivityManager.getInstance().removeActivity(this);}以上步驟，我們的語(yǔ)言切換算是完成了。但是，在API 26+以上版本，我們需要額外添加如下代碼做兼容，沒(méi)啥說(shuō)的，SDK變動(dòng)而已，跟著SDK走咯~（在activity或者BaseActivity添加）
@Overrideprotected void attachBaseContext(Context newBase) { Context context = languageWork(newBase); super.attachBaseContext(context); }private Context languageWork(Context context) { // 8.0及以上使用createConfigurationContext設(shè)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
以上就是本文的全部?jī)?nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持VEVB武林網(wǎng)。
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