Android之应用内部实现国际化

这篇文章也提供了应用内部转换语言的方法： http://blog.csdn.net/sodino/article/details/6596709 。
1和2的方法是一样的，然而还是会调整了手机的语言设置
3对于大型应用来说显得有点儿笨重

针对于这两种程况，我也提供一种方法，即能在不改变手机设置的前提下，又能在大型项目上显得不会太笨重。直接上代码：

工具类：

import android.content.Context;
import android.content.SharedPreferences;
import android.content.res.Configuration;
import android.content.res.Resources;
import android.preference.PreferenceManager;
import android.util.DisplayMetrics;
import java.util.Locale;

public class LanguageSettingUtil {
    //单例模式-
    private static LanguageSettingUtil instance;
    private Context context;
    //存储当前系统的language设置-
    private String defaultLanguage;
    //存储当前系统Locale-
    private Locale defaultLocale;
    public final static String ENGLISH = "en";
    public final static String CHINESE = "zh";

    private LanguageSettingUtil(Context paramContext) {
        //得到系统语言-
        Locale localLocale = Locale.getDefault();
        this.defaultLocale = localLocale;

        //保存系统语言到defaultLanguage
        String str = this.defaultLocale.getLanguage();
        this.defaultLanguage = str;

        this.context = paramContext;
    }

    //检验自身是否被创建-
    public static LanguageSettingUtil get() {
        if (instance == null)
            throw new IllegalStateException(
                    "language setting not initialized yet");
        return instance;
    }

    //初始化-
    public static void init(Context paramContext) {
        if (instance == null) {
            instance = new LanguageSettingUtil(paramContext);
        }
    }

    // 创建Configuration-
    private Configuration getUpdatedLocaleConfig(String paramString) {

        Configuration localConfiguration = context.getResources()
                .getConfiguration();
        Locale localLocale = getLocale(paramString);
        localConfiguration.locale = localLocale;
        return localConfiguration;
    }

    //得到APP配置文件目前的语言设置-
    public String getLanguage() {
        SharedPreferences localSharedPreferences = PreferenceManager
                .getDefaultSharedPreferences(this.context);
        //如果当前程序没有设置language属性就返回系统语言，如果有，就返回以前的-
        return localSharedPreferences.getString("language",
                this.defaultLanguage);
    }

    //如果配置文件中没有语言设置-
    public Locale getLocale() {
        String str = getLanguage();
        return getLocale(str);
    }

    //创建新Locale并覆盖原Locale-
    public Locale getLocale(String paramString) {
        Locale localLocale = new Locale(paramString);
        Locale.setDefault(localLocale);
        return localLocale;
    }

    //刷新显示配置-
    public void refreshLanguage() {
        String str = getLanguage();
        Resources localResources = this.context.getResources();
        if (!localResources.getConfiguration().locale.getLanguage().equals(str)) {
            Configuration localConfiguration = getUpdatedLocaleConfig(str);
            // A structure describing general information about a display, such
            // as its size, density, and font scaling.
            DisplayMetrics localDisplayMetrics = localResources
                    .getDisplayMetrics();
            localResources.updateConfiguration(localConfiguration,
                    localDisplayMetrics);
        }
    }

    //设置系统语言-
    public void saveLanguage(String paramString) {
        PreferenceManager.getDefaultSharedPreferences(this.context).edit()
                .putString("language", paramString).commit();
    }

    //保存系统的语言设置到SharedPreferences-
    public void saveSystemLanguage() {
        PreferenceManager.getDefaultSharedPreferences(this.context).edit()
                .putString("PreSysLanguage", this.defaultLanguage).commit();
    }

    public void checkSysChanged(String cuerSysLanguage) {
        //如果系统语言设置发生变化-
        if (!cuerSysLanguage.equals(PreferenceManager
                .getDefaultSharedPreferences(this.context).getString(
                        "PreSysLanguage", "zh"))) {
            //如果系统保存了this对象，就在这里修改defaultLanguage的值为当前系统语言cuerSysLanguage
            this.defaultLanguage = cuerSysLanguage;
            saveLanguage(cuerSysLanguage);
            saveSystemLanguage();
        }
    }
}

调用类：

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import com.example.internationaltest.util.LanguageSettingUtil;

public class MainActivity extends Activity {

    private LanguageSettingUtil languageSetting;
    private TextView h,w;
    private Button b;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        h = (TextView) findViewById(R.id.h);
        w = (TextView) findViewById(R.id.w);
        b = (Button) findViewById(R.id.b);
        
        LanguageSettingUtil.init(this);　　// 初始化
        languageSetting = LanguageSettingUtil.get();　　// 检查是否已经初始化
    }


    public void change(View view){
        languageSetting.saveLanguage("en");　　// 设置为"en"语言
        LanguageSettingUtil.get().refreshLanguage();　　// 刷新
        h.setText(R.string.hello);
        w.setText(R.string.world);
        b.setText(R.string.change);
    }
}