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

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