Android架构篇-2 国际化多语言

摘要
实现功能：
1.默认采用系统语言
2.语言切换后实时生效
3.支持中英文
4.我的->设置->切换语言

思路：app首次初始设置为系统语言，用户在app内切换语言时发送语言切换事件，刷新所有页面
在AppBaseActivity、AppBaseFragment通过EventBus来增加语言变更监听，收到变更语言的时间时更新当前context的语言环境，再刷新当前界面即可

AppBaseActivity

package com.wrs.project.module.app.common.base;

import android.annotation.SuppressLint;
import android.content.pm.ActivityInfo;
import android.os.Bundle;
import android.view.KeyEvent;

import androidx.annotation.Nullable;

import com.wrs.project.module.app.common.R;
import com.wrs.project.module.app.common.eventbus.MessageEvent;
import com.wrs.project.module.app.common.language.LanguageService;
import com.wrs.project.module.common.base.BaseActivity;
import com.wrs.project.module.common.network.HttpMethod;
import com.wrs.project.module.common.utils.activitymgr.ActivityMgr;
import com.wrs.project.module.common.utils.utils.L;

import org.greenrobot.eventbus.EventBus;
import org.greenrobot.eventbus.Subscribe;
import org.greenrobot.eventbus.ThreadMode;

import java.util.Map;

public class AppBaseActivity extends BaseActivity {
    private String tag = "AppBaseActivity";
    @SuppressLint("SourceLockedOrientationActivity")
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT); // 禁用横屏
        ActivityMgr.getInstance().addActivity(this);//把当前activity添加到堆栈里面
        EventBus.getDefault().register(this);
        LanguageService.updateLanguageConfig(this);
        initData();
        initUI();
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        L.e(tag, "activity destroy:" + this.toString());
        ActivityMgr.getInstance().removeActivity(this);
        EventBus.getDefault().unregister(this);
    }

    @Subscribe(threadMode = ThreadMode.MAIN)
    public void onMessageEvent(MessageEvent event) {
        MessageEvent.EventType type = event.getEventType();
        switch (type) {
            case SwitchLanguage:
            {
                LanguageService.updateLanguageConfig(this);
                refreshLanguageUI();
            }
            break;
        }
    }

    protected void refreshLanguageUI() {

    }

    @Override
    public void onStop() {
        super.onStop();

    }

    protected void initData() {

    }

    protected void initUI() {

    }

    @Override
    public boolean onKeyUp(int keyCode, KeyEvent event) {
        boolean flag = super.onKeyUp(keyCode, event);
//        if (keyCode == KeyEvent.KEYCODE_BACK && event.getAction() == KeyEvent.ACTION_UP) {
//            ActivityMgr.getInstance().removeActivity(this);
//            //不执行父类点击事件
//            return false;
//        }
        return flag;
    }

}

AppBaseFragment

package com.wrs.project.module.app.common.base;


import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;

import com.wrs.project.module.app.common.eventbus.MessageEvent;
import com.wrs.project.module.app.common.language.LanguageService;
import com.wrs.project.module.common.base.BaseFragment;

import org.greenrobot.eventbus.EventBus;
import org.greenrobot.eventbus.Subscribe;
import org.greenrobot.eventbus.ThreadMode;

public class AppBaseFragment extends BaseFragment {
    @Override
    public void onDestroy() {
        super.onDestroy();
        EventBus.getDefault().unregister(this);
    }

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        initData();
        View view = initView(inflater, container, savedInstanceState);
        if (null == view) {
            view = super.onCreateView(inflater, container, savedInstanceState);
        }
        EventBus.getDefault().register(this);
        return view;
    }

    protected void initData() {

    }

    protected View initView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        return null;
    }

    @Subscribe(threadMode = ThreadMode.MAIN)
    public void onMessageEvent(MessageEvent event) {
        MessageEvent.EventType type = event.getEventType();
        switch (type) {
            case SwitchLanguage:
            {
                LanguageService.updateLanguageConfig(this.getContext());
                refreshLanguageUI();
            }
            break;
        }
    }

    protected void refreshLanguageUI() {

    }
}

在我的->设置->切换语言可以切换app应用内语言，切换的语言类型保存到SharedPreferences

    public void switchLanguageBtnClick(View view) {
        AlertUtils.getAlertDialogBuilder(this, getString(R.string.mine_setting_switch_language), "", "中文", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                LanguageService.switchLanguage(Locale.CHINESE);
            }
        }, "English", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                LanguageService.switchLanguage(Locale.ENGLISH);
            }
        }).create().show();
    }

本demo只做了中英文的切换，如果还需要支持其他语言，只需要在语言的枚举类型里添加语言类型，并增加对应的页面翻译即可

public enum LanguageType {
    EN(Locale.ENGLISH),  // 英文
    CHINESE(Locale.CHINESE); // 中文

    private Locale locale;

    LanguageType(Locale locale) {
        this.locale = locale;
    }


    public Locale getLocale() {
        return locale;
    }

    public void setLocale(Locale locale) {
        this.locale = locale;
    }

    public static LanguageType getLanguageType(Locale locale) {
        if (null != locale) {
            for (LanguageType languageType : LanguageType.values()) {
                if (languageType.getLocale().equals(locale)) {
                    return languageType;
                }
            }
        }
         return null;
    }
}

源码下载