Android App Image caching solution

This article provides three caching strategies: (1) LRU algorithm, fixed cache picture number (max_num), when the number of pictures exceeds max_num, delete the least recently used picture in the cache. (2) FTU algorithm, fixed each picture of the cache time limit, with the last use, the time limit after the deletion. (3) FMU algorithm, in memory fixed a certain size of storage space, more than the fixed space after the maximum size of the cache to delete the picture. You only need to pass the URL of the picture to the body of the method when you use it.

How to use:

1. Import jar;

2. access to services;

3. Submit the URL, to the program to determine whether to download.

The code is as follows

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public class Imagecachetacticsdemoactivity extends activity { public void OnCreate (Bundle savedinstancestate) { Super.oncreate (savedinstancestate); Setcontentview (R.layout.item); /*fmu*/ Imagecachemanager = Imagecachemanager.getimagecacheservice (This, imagecachemanager.mode_fixed_memory_used, "MEMORY"); Imagecachemanager.setmax_memory (1024 * 1024); /*ftu*/ Imagecachemanager = Imagecachemanager.getimagecacheservice (This, imagecachemanager.mode_fixed_timed_used, "time"); Imagecachemanager.setdelay_millisecond (3 * 60 * 1000); /*lru*/ Imagecachemanager = Imagecachemanager.getimagecacheservice (This, imagecachemanager.mode_least_recently_used, "num"); Imagecachemanager.setmax_num (5); Imagecachemanager = Imagecachemanager.getimagecacheservice (This, imagecachemanager.mode_no_cache_used, "NoCache"); Mimageview = (ImageView) Findviewbyid (R.id.imageview); New Downloadtask () . Execute ("yun_qi_img/"); } Private class Downloadtask extends Asynctask<string, Void, bitmap> { @Override Protected Bitmap doinbackground (String ... params) { try { Return Imagecachemanager.downlaodimage (New URL (params[0)); catch (IOException e) { E.printstacktrace (); } return null; } @Override protected void OnPostExecute (Bitmap result) { Mimageview.setimagebitmap (result); Super.onpostexecute (result); } @Override protected void OnPreExecute () { Mimageview.setimageresource (R.drawable.ic_launcher); Super.onpreexecute (); } } Private ImageView Mimageview; Private Imagecachemanager Imagecachemanager; }