文件管理器源码分析（四）

package net.micode.fileexplorer;
/**
 * 一个类，只建立一个实例,不是线程安全的。
 * 单实例设置工具类，保存1个选项，是否显示隐藏文件和上级目录“.”
 */
public class Settings {
    // whether show system and cache images, default not
 private boolean mShowDotAndHiddenFiles;
 private static Settings mInstance;
 private Settings() {
    }
    public static Settings instance() {
        if(mInstance == null) {
            mInstance = new Settings();
 }
        return mInstance;
 }
    public boolean getShowDotAndHiddenFiles() {
        return mShowDotAndHiddenFiles;
 }
    public void setShowDotAndHiddenFiles(boolean s) {
        mShowDotAndHiddenFiles = s;
 }
}