Android listview asynchronously loads Images

 package CN. riddles. activity; import android. app. activity; import android. OS. bundle; import android. widget. listview; public class mainactivity extends activity {private listview lv; @ override public void oncreate (bundle savedinstancestate) {super. oncreate (savedinstancestate); setcontentview (R. layout. main); Lv = (listview) This. findviewbyid (R. id. test_lv); LV. setadapter (New songlistadapter (this) ;}

Package CN. riddles. activity; import android. content. context; import android. util. log; import android. view. layoutinflater; import android. view. view; import android. view. viewgroup; import android. widget. baseadapter; import android. widget. imageview; import android. widget. textview;/*** @ author riddlezhang song entry adapter */public class songlistadapter extends baseadapter {Private Static final string tag = "songlistadapter"; private context mcontext; private string [] strings = {"Wang Lihong", "Wu Zun", "He rundong", "Jin chengwu", "Wu yanzu"}; private string [] paths = {"http://list.image.baidu.com/t/image_category/galleryimg/menstar/hk/wang_li_hong.jpg ", "http://list.image.baidu.com/t/image_category/galleryimg/menstar/hk/wu_zun.jpg", "http://list.image.baidu.com/t/image_category/galleryimg/menstar/hk/he_run_dong.jpg", "http://list.image.baidu.com/t/image_category/galleryimg/menstar/hk/jin_cheng_wu.jpg", "http://list.image.baidu.com/t/image_category/galleryimg/menstar/hk/wu_yan_zu.jpg"}; Public songlistadapter (context mcontext) {This. mcontext = mcontext;} public void setmcontext (context mcontext) {This. mcontext = mcontext;} public int getcount () {return paths. length;} public object getitem (INT position) {return position;} public long getitemid (INT position) {return position;} public view getview (INT position, view convertview, viewgroup parent) {convertview = layoutinflater. from (mcontext ). inflate (R. layout. lv_adapter, null); imageview image = (imageview) convertview. findviewbyid (R. id. image); textview songer = (textview) convertview. findviewbyid (R. id. songer); image. settag (paths [position]); songer. settext (strings [position]); New canvasimagetask(.exe cute (image); // asynchronously load the Image Log. I (TAG, "execute:" + strings [position]); Return convertview ;}}

Package CN. riddles. activity; import Java. io. inputstream; import Java. lang. ref. softreference; import java.net. httpurlconnection; import java.net. URL; import Java. util. hashmap; import android. content. context; import android. graphics. drawable. drawable; import android. OS. asynctask; import android. util. log; import android. view. view; import android. webKit. urlutil;/*** @ author riddlezhang asynchronously loads images */public class Asyn Cviewtask extends asynctask <view, void, drawable> {private view mview; private hashmap <string, softreference <drawable> imagecache; Public asyncviewtask (context mcontext, string mobileinfo) {imagecache = new hashmap <string, softreference <drawable> ();} protected drawable doinbackground (view... views) {drawable = NULL; view = views [0]; If (view. gettag ()! = NULL) {If (imagecache. containskey (view. gettag () {softreference <drawable> cache = imagecache. get (view. gettag (). tostring (); drawable = cache. get (); If (drawable! = NULL) {return drawable;} Try {If (urlutil. ishttpurl (view. gettag (). tostring () {// if it is a network address. Then the connection URL downloads the image url = new URL (view. gettag (). tostring (); httpurlconnection conn = (httpurlconnection) URL. openconnection (); Conn. setdoinput (true); Conn. connect (); inputstream stream = Conn. getinputstream (); drawable = drawable. createfromstream (stream, "src"); stream. close ();} else {// if it is local data, parse drawable = drawable directly. createfrompath (view. gettag (). tostring () ;}} catch (exception e) {log. V ("IMG", E. getmessage (); Return NULL ;}} this. mview = view; return drawable;} protected void onpostexecute (drawable) {If (drawable! = NULL) {This. mview. setbackgrounddrawable (drawable); this. mview = NULL ;}}}