Android实现多语言切换

前言，最近要实现多语言切换需求，在网上查了很多资料，基本实现了想要的效果。
主要代码：

    Configuration configuration = activity.getResources().getConfiguration();
    LocaleList localeList = new LocaleList(locale);
    LocaleList.setDefault(localeList);
    configuration.setLocales(localeList);
    activity.getBaseContext().getResources().updateConfiguration(configuration,
            activity.getBaseContext().getResources().getDisplayMetrics());

多语言切换前提是多语言资源，首先add需要的values文件夹，比如，本案例实现的是简体中文、繁体中文和英语环境，我就在res文件夹下另外add两个文件夹，values-en（英语资源文件夹）和values-zh-rTW（繁体中文资源文件夹），分别添加string文件，分别如图：



主要实现思路是通过sharePreference存储的标识，判断之前是否设置过语言环境，然后选择语言显示。
首先新建了一个工具类LocalUtils.class ，

/**
* Created by GerryRun on 2018/6/13.
* com.android.gerryrun.myanimdemo.utils
* email [e-mail]
*/

public class LocalUtils {

public static final String LOCAL_DEFAULT_LANGUAGE = "LOCAL_DEFAULT_LANGUAGE";
public static final String LOCAL_SIMPLE_CHINESE_LANGUAGE = "CN";
public static final String LOCAL_TRADITIONAL_CHINESE_LANGUAGE = "TW";
public static final String LOCAL_ENGLISH_LANGUAGE = "EN";
private static final String TAG = LocalUtils.class.getSimpleName();
private static boolean isCommit = false;


/***
 * 设置语言环境
 * @param activity
 * @param locale 比如，Locale.ENGLISH
 */
public static void setLanguage(Activity activity, Locale locale) {
    if (activity == null) {
        throw new NullPointerException("activity cannot be null");
    }
    Configuration configuration = activity.getResources().getConfiguration();
    if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.N) {
        LocaleList localeList = new LocaleList(locale);
        LocaleList.setDefault(localeList);
        configuration.setLocales(localeList);
    } else {
        configuration.locale = locale;
    }
    activity.getBaseContext().getResources().updateConfiguration(configuration,
            activity.getBaseContext().getResources().getDisplayMetrics());
}

/****
 * 获取 SharedPreferences 保存的语言环境标识
 * @return 保存的语言环境标识
 */
public static String getLanguage() {
    SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(GRApplication.getInstance());
    return preferences.getString(LOCAL_DEFAULT_LANGUAGE, "TW");
}

/***
 * 保存语言标识
 * @param language
 * @return
 */
public static boolean saveLanguage(String language) {

    /***
     * 通过sharepreference保存标识，
     * 中文-LOCAL_SIMPLE_CHINESE_LANGUAGE，
     * 英文-LOCAL_ENGLISH_LANGUAGE
     * 繁体-LOCAL_TRADITIONAL_CHINESE_LANGUAGE
     */
    if (language.equals(LOCAL_SIMPLE_CHINESE_LANGUAGE)) {

        SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(GRApplication.getInstance());
        SharedPreferences.Editor editor = sp.edit();
        editor.remove(LocalUtils.LOCAL_DEFAULT_LANGUAGE);
        editor.putString(LocalUtils.LOCAL_DEFAULT_LANGUAGE, LOCAL_SIMPLE_CHINESE_LANGUAGE);
        isCommit = editor.commit();
    } else if (language.equals(LocalUtils.LOCAL_ENGLISH_LANGUAGE)) {

        SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(GRApplication.getInstance());
        SharedPreferences.Editor editor = sp.edit();
        editor.remove(LocalUtils.LOCAL_DEFAULT_LANGUAGE);
        editor.putString(LocalUtils.LOCAL_DEFAULT_LANGUAGE, LOCAL_ENGLISH_LANGUAGE);
        isCommit = editor.commit();
    } else if (language.equals(LOCAL_TRADITIONAL_CHINESE_LANGUAGE)) {

        SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(GRApplication.getInstance());
        SharedPreferences.Editor editor = sp.edit();
        editor.remove(LocalUtils.LOCAL_DEFAULT_LANGUAGE);
        editor.putString(LocalUtils.LOCAL_DEFAULT_LANGUAGE, LOCAL_TRADITIONAL_CHINESE_LANGUAGE);
        isCommit = editor.commit();
    }

    Log.e(TAG, language);
    return isCommit;
}

布局内容：

<?xml version="1.0" encoding="utf-8"?>
<layout>

    <android.support.constraint.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="com.android.gerryrun.myanimdemo.changeLanguage.ChangeLanguageActivity">

        <Button  android:id="@+id/bt_change_language" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@string/app_language_test" />

    </android.support.constraint.ConstraintLayout>
</layout>

布局中的button的点击事件：

@RequiresApi(api = Build.VERSION_CODES.N)
@Override
public void onClick(View v) {
    switch (v.getId()) {
        case R.id.bt_change_language:
            if (LocalUtils.getLanguage().equals(LocalUtils.LOCAL_ENGLISH_LANGUAGE)) {
                LocalUtils.setLanguage(mActivity, Locale.SIMPLIFIED_CHINESE);
                isCommit = LocalUtils.saveLanguage(LocalUtils.LOCAL_SIMPLE_CHINESE_LANGUAGE);
            } else if (LocalUtils.getLanguage().equals(LocalUtils.LOCAL_SIMPLE_CHINESE_LANGUAGE)) {
                LocalUtils.setLanguage(mActivity, Locale.TRADITIONAL_CHINESE);
                isCommit = LocalUtils.saveLanguage(LocalUtils.LOCAL_TRADITIONAL_CHINESE_LANGUAGE);
            } else if (LocalUtils.getLanguage().equals(LocalUtils.LOCAL_TRADITIONAL_CHINESE_LANGUAGE)) {
                LocalUtils.setLanguage(mActivity, Locale.ENGLISH);
                isCommit = LocalUtils.saveLanguage(LocalUtils.LOCAL_ENGLISH_LANGUAGE);
            }


            //如果Editor.commit()成功
            if (isCommit) {

                Intent intent = new Intent(this, FlashActivity.class);
                intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
                startActivity(intent);
                // 杀掉进程，重启app
                android.os.Process.killProcess(android.os.Process.myPid());
                System.exit(0);
            }
            break;
    }
}

效果是点击button重启APP,完成多语言显示替换,效果图如下: