package com.loaderman.language;

import android.content.res.Configuration;

import android.content.res.Resources;

import android.os.Bundle;

import android.support.annotation.Nullable;

import android.support.v7.app.AppCompatActivity;

import android.util.DisplayMetrics;

import org.greenrobot.eventbus.EventBus;

import org.greenrobot.eventbus.Subscribe;

import org.greenrobot.eventbus.ThreadMode;

import java.util.Locale;

public class BaseActivity extends AppCompatActivity {

    @Override

    protected void onCreate(@Nullable Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        EventBus.getDefault().register(this);

        changeAppLanguage();

    }

    @Subscribe(threadMode = ThreadMode.MAIN)

    public void onEvent(String str) {

        switch (str) {

            case "EVENT_REFRESH_LANGUAGE":

                changeAppLanguage();

                recreate();//刷新界面

                break;

        }

    }

    public void changeAppLanguage() {

        String sta = Store.getLanguageLocal(this);

        if(sta != null && !"".equals(sta)){

            // 本地语言设置

            Locale myLocale = new Locale(sta);

            Resources res = getResources();

            DisplayMetrics dm = res.getDisplayMetrics();

            Configuration conf = res.getConfiguration();

            conf.locale = myLocale;

            res.updateConfiguration(conf, dm);

        }

    }

    @Override

    protected void onDestroy() {

        super.onDestroy();

        EventBus.getDefault().unregister(this);

    }

}

package com.loaderman.language;

import android.content.Context;

import android.content.SharedPreferences;

import android.preference.PreferenceManager;

public class Store {

    public static void setLanguageLocal(Context context, String language){

        SharedPreferences preferences;

        SharedPreferences.Editor editor;

        preferences = PreferenceManager.getDefaultSharedPreferences(context);

        editor = preferences.edit();

        editor.putString("language", language);

        editor.commit();

    }

    public static String getLanguageLocal(Context context){

        SharedPreferences preferences;

        preferences = PreferenceManager.getDefaultSharedPreferences(context);

        String language = preferences.getString("language", "");

        return language;

    }

}

import android.content.Intent;

import android.os.Bundle;

import android.view.View;

public class MainActivity extends BaseActivity {

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        setTitle("第一个Activity");

        findViewById(R.id.btn_setting).setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                startActivity(new Intent(MainActivity.this, SettingActivity.class));

            }

        });

    }

}

package com.loaderman.language;

import android.content.DialogInterface;

import android.os.Bundle;

import android.support.annotation.Nullable;

import android.support.v7.app.AlertDialog;

import android.view.View;

import android.widget.Button;

import org.greenrobot.eventbus.EventBus;

public class SettingActivity extends BaseActivity {

    @Override

    protected void onCreate(@Nullable Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        setTitle("设置Activity");

        final String[] cities = {getString(R.string.lan_chinese), getString(R.string.lan_en), getString(R.string.lan_ja), getString(R.string.lan_de)};

        final String[] locals = {"zh_CN", "en", "ja", "de"};

        Button button = (Button)findViewById(R.id.btn_setting);

        button.setText("Language");

        button.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                AlertDialog.Builder builder = new AlertDialog.Builder(SettingActivity.this);

                builder.setIcon(R.mipmap.ic_launcher);

                builder.setTitle(R.string.select_language);

                builder.setItems(cities, new DialogInterface.OnClickListener()

                {

                    @Override

                    public void onClick(DialogInterface dialog, int which)

                    {

                        Store.setLanguageLocal(SettingActivity.this, locals[which]);

                        EventBus.getDefault().post("EVENT_REFRESH_LANGUAGE");

                    }

                });

                builder.show();

            }

        });

    }

}