Android應用內設定多語言，可隨系統語言改變而改變，也可設定app為固定語言不受系統語言影響
阿新 • • 發佈：2018-12-23
轉載請標明出處： https://blog.csdn.net/m0_38074457/article/details/84993366，本文出自：【陳少華的部落格】
一、效果圖
https://github.com/hnsycsxhzcsh/MultiLanguage/blob/master/myres/multilanguage.gif
二、實現原理
1、Application的onCreate中初始化，根據本地sp儲存的多語言資訊來確定app中顯示哪種語言
2、在設定介面選擇對應語言，然後把語言資訊儲存到sp中，重啟應用
三、實現程式碼
1、首先要有一個多語言方法類MultiLanguageUtil
import android.annotation.TargetApi; import android.content.Context; import android.content.res.Configuration; import android.content.res.Resources; import android.os.Build; import android.os.LocaleList; import android.text.TextUtils; import android.util.DisplayMetrics; import com.multilanguage.ConstantGlobal; import java.util.Locale; /** * Created by HARRY on 2018/6/5 0005. */ public class MultiLanguageUtil { public static Context attachBaseContext(Context context) { if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) { return createConfigurationResources(context); } else { setConfiguration(context); return context; } } /** * 設定語言 * * @param context */ public static void setConfiguration(Context context) { Locale appLocale = getAppLocale(context); //如果本地有語言資訊，以本地為主，如果本地沒有使用預設Locale Locale locale = null; String spLanguage = SpUtil.getString(context, ConstantGlobal.LOCALE_LANGUAGE); String spCountry = SpUtil.getString(context, ConstantGlobal.LOCALE_COUNTRY); if (!TextUtils.isEmpty(spLanguage) && !TextUtils.isEmpty(spCountry)) { if (isSameLocal(appLocale, spLanguage, spCountry)) { locale = appLocale; } else { locale = new Locale(spLanguage, spCountry); } } else { locale = appLocale; } Configuration configuration = context.getResources().getConfiguration(); if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) { configuration.setLocale(locale); } else { configuration.locale = locale; } Resources resources = context.getResources(); DisplayMetrics dm = resources.getDisplayMetrics(); resources.updateConfiguration(configuration, dm);//語言更換生效的程式碼! } @TargetApi(Build.VERSION_CODES.N) private static Context createConfigurationResources(Context context) { Resources resources = context.getResources(); Configuration configuration = resources.getConfiguration(); Locale appLocale = getAppLocale(context); //如果本地有語言資訊，以本地為主，如果本地沒有使用預設Locale Locale locale = null; String spLanguage = SpUtil.getString(context, ConstantGlobal.LOCALE_LANGUAGE); String spCountry = SpUtil.getString(context, ConstantGlobal.LOCALE_COUNTRY); if (!TextUtils.isEmpty(spLanguage) && !TextUtils.isEmpty(spCountry)) { if (isSameLocal(appLocale, spLanguage, spCountry)) { locale = appLocale; } else { locale = new Locale(spLanguage, spCountry); } } else { locale = appLocale; } configuration.setLocale(locale); configuration.setLocales(new LocaleList(locale)); return context.createConfigurationContext(configuration); } /** * 更改應用語言 * * @param * @param locale 語言地區 * @param persistence 是否持久化 */ public static void changeAppLanguage(Context context, Locale locale, boolean persistence) { Resources resources = context.getResources(); DisplayMetrics metrics = resources.getDisplayMetrics(); Configuration configuration = resources.getConfiguration(); if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) { configuration.setLocale(locale); configuration.setLocales(new LocaleList(locale)); context.createConfigurationContext(configuration); } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) { configuration.setLocale(locale); } else { configuration.locale = locale; } resources.updateConfiguration(configuration, metrics); if (persistence) { saveLanguageSetting(context, locale); } } //儲存多語言資訊到sp中 public static void saveLanguageSetting(Context context, Locale locale) { SpUtil.saveString(context, ConstantGlobal.LOCALE_LANGUAGE, locale.getLanguage()); SpUtil.saveString(context, ConstantGlobal.LOCALE_COUNTRY, locale.getCountry()); } //獲取本地應用的實際的多語言資訊 public static Locale getAppLocale(Context context) { //獲取應用語言 Resources resources = context.getResources(); Configuration configuration = resources.getConfiguration(); Locale locale = null; if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) { locale = configuration.getLocales().get(0); } else { locale = configuration.locale; } return locale; } //判斷sp中和app中的多語言資訊是否相同 public static boolean isSameWithSetting(Context context) { Locale locale = getAppLocale(context); String language = locale.getLanguage(); String country = locale.getCountry(); String sp_language = SpUtil.getString(ConstantGlobal.LOCALE_LANGUAGE); String sp_country = SpUtil.getString(ConstantGlobal.LOCALE_COUNTRY); if (language.equals(sp_language) && country.equals(sp_country)) { return true; } else { return false; } } public static boolean isSameLocal(Locale appLocale, String sp_language, String sp_country) { String appLanguage = appLocale.getLanguage(); String appCountry = appLocale.getCountry(); if (appLanguage.equals(sp_language) && appCountry.equals(sp_country)) { return true; } else { return false; } } }
2、在應用的application中根據sp儲存的多語言資訊做初始化
最重要的是
1、attachBaseContext方法中的初始化，應用剛啟動的時候此方法在onCreate前執行，當用戶修改手機系統的預設語言時，也會呼叫attachBaseContext方法
2.onCreate中一定要加上registerActivityLifecycleCallbacks(callbacks);用來監聽Activity頁面如果不是sp中設定的語言的話，可以修改成對應sp中的語言
import android.app.Activity; import android.app.Application; import android.content.Context; import android.os.Bundle; import android.text.TextUtils; import com.multilanguage.utils.MultiLanguageUtil; import com.multilanguage.utils.SpUtil; import java.util.Locale; /** * Created by HARRY on 2018/12/13 0013. */ public class MultiLanguageApp extends Application { private static Context mAppContext; public static Context getContext() { return mAppContext; } @Override public void onCreate() { super.onCreate(); this.mAppContext = getApplicationContext(); //初始化本地語言，這句話可以不要，因為在attachBaseContext中已經處理了 // changeLanguage(); //註冊Activity生命週期監聽回撥，此部分一定加上，因為有些版本不加的話多語言切換不回來 registerActivityLifecycleCallbacks(callbacks); } private void changeLanguage() { Locale newLocale = MultiLanguageUtil.getAppLocale(this); String appLanguage = newLocale.getLanguage(); String appCountry = newLocale.getCountry(); String spLanguage = SpUtil.getString(getApplicationContext(), ConstantGlobal.LOCALE_LANGUAGE); String spCountry = SpUtil.getString(getApplicationContext(), ConstantGlobal.LOCALE_COUNTRY); if (!TextUtils.isEmpty(spLanguage) && !TextUtils.isEmpty(spCountry)) { // 如果有一個不同 if (!MultiLanguageUtil.isSameWithSetting(this)) { Locale locale = new Locale(spLanguage, spCountry); MultiLanguageUtil.changeAppLanguage(getApplicationContext(), locale, false); } } } ActivityLifecycleCallbacks callbacks = new ActivityLifecycleCallbacks() { @Override public void onActivityCreated(Activity activity, Bundle savedInstanceState) { String language = SpUtil.getString(getApplicationContext(), ConstantGlobal.LOCALE_LANGUAGE); String country = SpUtil.getString(getApplicationContext(), ConstantGlobal.LOCALE_COUNTRY); if (!TextUtils.isEmpty(language) && !TextUtils.isEmpty(country)) { //強制修改應用語言 if (!MultiLanguageUtil.isSameWithSetting(activity)) { Locale locale = new Locale(language, country); MultiLanguageUtil.changeAppLanguage(activity, locale, false); // activity.recreate(); } } } @Override public void onActivityStarted(Activity activity) { } @Override public void onActivityResumed(Activity activity) { } @Override public void onActivityPaused(Activity activity) { } @Override public void onActivityStopped(Activity activity) { } @Override public void onActivitySaveInstanceState(Activity activity, Bundle outState) { } @Override public void onActivityDestroyed(Activity activity) { } //Activity 其它生命週期的回撥 }; @Override protected void attachBaseContext(Context base) { //系統語言等設定發生改變時會呼叫此方法，需要要重置app語言 super.attachBaseContext(MultiLanguageUtil.attachBaseContext(base)); } }
3、做語言切換時候調以下用方法
注意：我這裡在設定好語言後做了應用重啟，因為發現如果不重啟，會出現有些頁面多語言沒有切換的情況
例如：設定簡體中文時候呼叫changeLanguage("zh","CN")，其他語言引數可以其他地方查詢
//修改應用內語言設定
private void changeLanguage(String language, String area) {
if (TextUtils.isEmpty(language) && TextUtils.isEmpty(area)) {
//如果語言和地區都是空，那麼跟隨系統
SpUtil.saveString(ConstantGlobal.LOCALE_LANGUAGE, "");
SpUtil.saveString(ConstantGlobal.LOCALE_COUNTRY, "");
} else {
//不為空，那麼修改app語言，並true是把語言資訊儲存到sp中，false是不儲存到sp中
Locale newLocale = new Locale(language, area);
MultiLanguageUtil.changeAppLanguage(MainActivity.this, newLocale, true);
MultiLanguageUtil.changeAppLanguage(MultiLanguageApp.getContext(), newLocale, true);
}
//重啟app,這一步一定要加上，如果不重啟app，可能開啟新的頁面顯示的語言會不正確
Intent intent = new Intent(MultiLanguageApp.getContext(), MainActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
MultiLanguageApp.getContext().startActivity(intent);
android.os.Process.killProcess(android.os.Process.myPid());
}
備註：具體程式碼我放在了github上https://github.com/hnsycsxhzcsh/MultiLanguage， 進入github後點擊右上角star謝謝支援！