App多语言切换实现

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先看下效果：

1、在res目录下新建values-en目录，在此目录下新建string.xml文件，内容如下：

<resources>
    <string name="complete_info">complete information</string>
    <string name="account_query">account query</string>
    <string name="about_us">about us</string>
    <string name="system_setting">system setting</string>
    <string name="log_out">log out</string>
    <string name="change_language">change language</string>
</resources>

在默认的values文件下string.xml文件有对应的中文：

<resources>
    <string name="complete_info">完善信息</string>
    <string name="account_query">账户查询</string>
    <string name="about_us">关于我们</string>
    <string name="system_setting">系统设置</string>
    <string name="log_out">退出登录</string>
    <string name="change_language">切换语言</string>
</resources>

2、切换语言工具类：

public class ChangeLanguageHelper {

    /**
     * 说明：
     * 1、context.getResources().getConfiguration()获取的是本应用内部的语言和地区设置的Configuration
     * 2、Resources.getSystem().getConfiguration()获取的是系统的语言和地区设置的Configuration
     */
    public static void changeAppLanguage(Context context, int language) {
        Resources resources = context.getResources();
        DisplayMetrics dm = resources.getDisplayMetrics();
        Configuration config = resources.getConfiguration();
        if (Build.VERSION.SDK_INT > Build.VERSION_CODES.JELLY_BEAN) {
            config.setLocale(getLocale(language));
        } else {
            config.locale = getLocale(language);
        }
        resources.updateConfiguration(config, dm);
        SPUtil.getInstance().setAppLanguage(language);
    }

    private static Locale getLocale(int language){
        //默认是系统的语言设置
        Locale locale = Resources.getSystem().getConfiguration().locale;
        if (language == Constant.SIMPLE_CHINESE) {//简体中文
            locale = Locale.SIMPLIFIED_CHINESE;
        }
        if (language == Constant.ENGLISH) {//英文
            locale = Locale.ENGLISH;
        }
        return locale;
    }

}

3、切换语言代码：

public class SelectLanguageActivity extends BaseActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_select_language);

        setClick();
    }

    private void setClick() {
        findViewById(R.id.auto_tv).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                ChangeLanguageHelper.changeAppLanguage(mContext, Constant.LANGUAGE_DEFAULT);
                RestartApp();
            }
        });

        findViewById(R.id.chinese_tv).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                ChangeLanguageHelper.changeAppLanguage(mContext, Constant.SIMPLE_CHINESE);
                RestartApp();
            }
        });

        findViewById(R.id.english_tv).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                ChangeLanguageHelper.changeAppLanguage(mContext, Constant.ENGLISH);
                RestartApp();
            }
        });
    }

    private void RestartApp() {
        Intent intent = new Intent(this, MainActivity.class);
        //开始新的activity同时移除之前所有的activity
        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
        startActivity(intent);
        finish();
    }
}

4、Activity的基类：

public abstract class BaseActivity extends AppCompatActivity{

    protected Context mContext;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mContext = this;
        //保证app进程杀死后再次启动时，之前的语言设置有效
        ChangeLanguageHelper.changeAppLanguage(mContext, SPUtil.getInstance().getAppLanguage());
    }
}

常量类：

public class Constant {

    public static final int LANGUAGE_DEFAULT = 0; //自动
    public static final int SIMPLE_CHINESE = 1; //中文
    public static final int ENGLISH = 2; //英文

}