Android 项目必备（二十一）--＞APP 多语言切换（国际化）
最近公司开始做多语言版本，由于之前没有做过，所以在网上搜寻了一番这方面的资料，最后经过实践、总结，写下了这篇文章。
效果图
实现
1. 创建对应语言的 string.xml 简体中文，繁体和 English 三个语言。
2. MultiLanguage.java
public class MultiLanguage {
private static LanguageListener languageLocalListener;
public static void init(LanguageListener listener) {
languageLocalListener = listener;
}
public static Context setLocal(Context context) {
return updateResources(context, getSetLanguageLocale(context));
}
/**
* 设置语言类型
*/
public static void setApplicationLanguage(Context context) {
Resources resources = context.getApplicationContext().getResources();
DisplayMetrics dm = resources.getDisplayMetrics();
Configuration config = resources.getConfiguration();
Locale locale = getSetLanguageLocale(context);
config.locale = locale;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
LocaleList localeList = new LocaleList(locale);
LocaleList.setDefault(localeList);
config.setLocales(localeList);
context.getApplicationContext().createConfigurationContext(config);
Locale.setDefault(locale);
}
resources.updateConfiguration(config, dm);
}
/**
* @param context
*/
public static void onConfigurationChanged(Context context) {
setLocal(context);
setApplicationLanguage(context);
}
/**
* 获取选择的语言
*
* @param context
* @return
*/
private static Locale getSetLanguageLocale(Context context) {
if (languageLocalListener != null) {
return languageLocalListener.getSetLanguageLocale(context);
}
return Locale.ENGLISH;
}
/**
* 更新语言设置
*
* @param context
* @param locale
* @return
*/
private static Context updateResources(Context context, Locale locale) {
Locale.setDefault(locale);
Resources res = context.getResources();
Configuration config = new Configuration(res.getConfiguration());
if (Build.VERSION.SDK_INT >= 17) {
config.setLocale(locale);
context = context.createConfigurationContext(config);
} else {
config.locale = locale;
res.updateConfiguration(config, res.getDisplayMetrics());
}
return context;
}
/**
* 获取系统语言
* @param newConfig
* @return
*/
public static Locale getSystemLocal(Configuration newConfig) {
Locale locale;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
locale = newConfig.getLocales().get(0);
} else {
locale = newConfig.locale;
}
return locale;
}
/**
* 获取系统语言
* @param context
* @return
*/
public static Locale getSystemLocal(Context context) {
Locale locale;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
locale = LocaleList.getDefault().get(0);
} else {
locale = Locale.getDefault();
}
return locale;
}
}
3. SPUtil.java
public class SPUtil {
private final String SP_NAME = "language_setting";
private final String TAG_LANGUAGE = "language_select";
private final String TAG_SYSTEM_LANGUAGE = "system_language";
private static volatile SPUtil instance;
private final SharedPreferences mSharedPreferences;
private Locale systemCurrentLocal = Locale.ENGLISH;
public SPUtil(Context context) {
mSharedPreferences = context.getSharedPreferences(SP_NAME, Context.MODE_PRIVATE);
}
public void saveLanguage(int select) {
SharedPreferences.Editor edit = mSharedPreferences.edit();
edit.putInt(TAG_LANGUAGE, select);
edit.commit();
}
public int getSelectLanguage() {
return mSharedPreferences.getInt(TAG_LANGUAGE, 0);
}
public Locale getSystemCurrentLocal() {
return systemCurrentLocal;
}
public void setSystemCurrentLocal(Locale local) {
systemCurrentLocal = local;
}
public static SPUtil getInstance(Context context) {
if (instance == null) {
synchronized (SPUtil.class) {
if (instance == null) {
instance = new SPUtil(context);
}
}
}
return instance;
}
}
4. LanguageUtils.java
public class LanguageUtils {
private static final String TAG = "LocalManageUtil";
/**
* 获取系统的locale
*
* @return Locale对象
*/
public static Locale getSystemLocale(Context context) {
return SPUtil.getInstance(context).getSystemCurrentLocal();
}
public static String getSelectLanguage(Context context) {
switch (SPUtil.getInstance(context).getSelectLanguage()) {
case 0:
return context.getString(R.string.language_auto);
case 1:
return context.getString(R.string.language_cn);
case 2:
return context.getString(R.string.language_traditional);
case 3:
default:
return context.getString(R.string.language_en);
}
}
/**
* 获取选择的语言设置
*
* @param context
* @return
*/
public static Locale getSetLanguageLocale(Context context) {
switch (SPUtil.getInstance(context).getSelectLanguage()) {
case 0:
return getSystemLocale(context);
case 1:
return Locale.CHINA;
case 2:
return Locale.TAIWAN;
case 3:
default:
return Locale.ENGLISH;
}
}
public static void saveSystemCurrentLanguage(Context context) {
SPUtil.getInstance(context).setSystemCurrentLocal(MultiLanguage.getSystemLocal(context));
}
/**
* 保存系统语言
* @param context
* @param newConfig
*/
public static void saveSystemCurrentLanguage(Context context, Configuration newConfig) {
SPUtil.getInstance(context).setSystemCurrentLocal(MultiLanguage.getSystemLocal(newConfig));
}
public static void saveSelectLanguage(Context context, int select) {
SPUtil.getInstance(context).saveLanguage(select);
MultiLanguage.setApplicationLanguage(context);
}
}
5. LanguageListener.java
public interface LanguageListener {
/**
* 获取选择设置语言
*
* @param context
* @return
*/
Locale getSetLanguageLocale(Context context);
}
6. LauncherApp.java
public class LauncherApp extends Application {
@Override
protected void attachBaseContext(Context base) {
//第一次进入app时保存系统选择语言(为了选择随系统语言时使用，如果不保存，切换语言后就拿不到了）
LanguageUtils.saveSystemCurrentLanguage(base);
super.attachBaseContext(MultiLanguage.setLocal(base));
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
//用户在系统设置页面切换语言时保存系统选择语言(为了选择随系统语言时使用，如果不保存，切换语言后就拿不到了）
LanguageUtils.saveSystemCurrentLanguage(getApplicationContext(), newConfig);
MultiLanguage.onConfigurationChanged(getApplicationContext());
}
@Override
public void onCreate() {
super.onCreate();
MultiLanguage.init(new LanguageListener() {
@Override
public Locale getSetLanguageLocale(Context context) {
//返回自己本地保存选择的语言设置
return LanguageUtils.getSetLanguageLocale(context);
}
});
MultiLanguage.setApplicationLanguage(this);
}
}
7. 布局文件
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/text"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
androidx.constraintlayout.widget.ConstraintLayout>
在线工具
在线转换工具：中文转繁体