Xiaomi Open source File Manager micodefileexplorer-Source Research (3)-2 single-instance tool classes

Starting with this article, we'll explain the classes in the Net.micode.fileexplorer.util Toolkit.
The class under this package, functions are also relatively single and independent. Many of the ideas and implementations of code can be used in many environments such as Javaweb and Android.


One, single instance activity manager Activitiesmanager
A single-instance activity manager, "Sodom", from the point of view of the method being called.
Registeractivity registered activity method is used, and getactivity is not used, feel obviously there is a problem ah ~
My current guess:
When you look at a file, you'll create a new activity and register it for preservation.
Then, when needed, use getactivity to get it, then do the follow-up process.
However, the Getactivity method is not used at all.


I guess: "Community open source" is castrated, the code is cut?

Package Net.micode.fileexplorer.util;import Java.util.hashmap;import android.app.activity;/** Single Instance activity manager */public    Class Activitiesmanager {public static final String Activity_file_view = "FileView";    @Deprecated is not used by any other class public static final String activity_file_category = "Filecategory";    @Deprecated is not used by any other class public static final String Activity_tab = "Fileexplorertab";    private static Activitiesmanager instance;    Private hashmap<string, activity> activities = new hashmap<string, activity> (); Private Activitiesmanager () {}//return True indicates successful, False indicates the name exists//There is no return value at all    Say "Community open source" is castrated? is used by fileviewactivity, presumably when viewing a file, a new active public void registeractivity (String name, activity a) {ACTIVITIES.P    UT (name, a);    }//@Deprecated is not being used by any other class public Activity getactivity (String name) {return activities.get (name); } public static Activitiesmanager getinstance () {if (instance = = NULL) instance = new Activitiesmanager ();    return instance; }}

Second, single-instance Setup tool class settings
For 1 functions, Save and view "show hidden files and parent directories".
Are there too few settings or "preferences" for this program?

Package net.micode.fileexplorer.util;/** Single Instance Setup Tool class, save 1 options, whether to show hidden files and parent directories "." */public class Settings {    //whether show system and cache images, default not    private Boolean mshowdotandhiddenfi Les;    private static Settings minstance;    Private Settings () {    } public    static Settings instance () {        if (minstance = = null) {            minstance = new Setting S ();        }        return minstance;    }    public Boolean getshowdotandhiddenfiles () {        return mshowdotandhiddenfiles;    }    public void Setshowdotandhiddenfiles (Boolean s) {        mshowdotandhiddenfiles = s;    }}

Iii. about Single Instance
A class that establishes only one instance.
Currently, none of these 2 classes are thread-safe.

Copyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced.

Xiaomi Open source File Manager micodefileexplorer-Source Research (3)-2 single-instance tool classes