Android Custom Listview Image loading without libraries -
i want load images sd card custom listview. listview contains image view , text view. know there many libraries can me achieve this, i want without using such libraries.
problem :-
i loading images async task. calling async task inside getview(). images in last row. is, if there 3 images in folder, image shown in 3rd item of listview.
below code :-
public class myphotoadapter extends baseadapter { private activity callingactivity; private arraylist<string> filepaths = new arraylist<string>();//contains file path of images arraylist<bitmap> myimages = new arraylist<bitmap>(); private int imagewidth; int position; imageview iv_photo; textview tv_address; public myphotoadapter(activity activity,arraylist<string> paths,int width) { this.callingactivity = activity; this.filepaths = paths; this.imagewidth = width; } @override public int getcount() { return filepaths.size(); } @override public object getitem(int i) { return this.filepaths.get(i); } @override public long getitemid(int i) { return 0; } @override public view getview(int i, view view, viewgroup viewgroup) { position = i; layoutinflater inflater = (layoutinflater) callingactivity.getsystemservice(context.layout_inflater_service); view row = inflater.inflate(r.layout.single_photo,viewgroup, false); iv_photo = (imageview) row.findviewbyid(r.id.photoview); tv_address = (textview) row.findviewbyid(r.id.tv_address); asyncimageloader loader = new asyncimageloader(); loader.execute(filepaths); return row; } class asyncimageloader extends asynctask<arraylist<string>,bitmap,void>{ progressdialog dialog; @override protected void onpreexecute() { super.onpreexecute(); dialog = progressdialog.show(callingactivity,"loading images","please wait ...."); } @override protected void doinbackground(arraylist<string>... arrays) { log.d("test","total images :- "+arrays[0].size()); for(int = 0; i< arrays[0].size(); i++) { bitmap map = decodefile(arrays[0].get(i).tostring(), 150, 150); myimages.add(map); publishprogress(map); } return null; } @override protected void onprogressupdate(bitmap... bitmap) { iv_photo.setimagebitmap(bitmap[0]); } @override protected void onpostexecute(void avoid) { //super.onpostexecute(avoid); dialog.dismiss(); /*for(int = 0; < myimages.size(); ++) { iv_photo.setimagebitmap(myimages.get(i)); }*/ } public bitmap decodefile(string filepath, int width, int hight) { try { file f = new file(filepath); bitmapfactory.options o = new bitmapfactory.options(); o.injustdecodebounds = true; bitmapfactory.decodestream(new fileinputstream(f), null, o); final int required_width = width; final int required_hight = hight; int scale = 1; while (o.outwidth / scale / 2 >= required_width && o.outheight / scale / 2 >= required_hight) scale *= 2; bitmapfactory.options o2 = new bitmapfactory.options(); o2.insamplesize = scale; return bitmapfactory.decodestream(new fileinputstream(f), null, o2); } catch (filenotfoundexception e) { e.printstacktrace(); } return null; } } } image shown in last list-item. other image views dont show images.
you can follow this know more handling concurrency.
i have modified code ..... please see if helps
public class myphotoadapter extends baseadapter { private activity callingactivity; private arraylist<string> filepaths = new arraylist<string>(); arraylist<bitmap> myimages = new arraylist<bitmap>(); private int imagewidth; int position; imageview iv_photo; textview tv_address; public myphotoadapter(activity activity,arraylist<string> paths,int width) { this.callingactivity = activity; this.filepaths = paths; this.imagewidth = width; } @override public int getcount() { return filepaths.size(); } @override public object getitem(int i) { return this.filepaths.get(i); } @override public long getitemid(int i) { return 0; } @override public view getview(int i, view view, viewgroup viewgroup) { position = i; layoutinflater inflater = (layoutinflater) callingactivity.getsystemservice(context.layout_inflater_service); view row = inflater.inflate(r.layout.single_photo,viewgroup, false); iv_photo = (imageview) row.findviewbyid(r.id.photoview); tv_address = (textview) row.findviewbyid(r.id.tv_address); asyncimageloader loader = new asyncimageloader(iv_photo); loader.execute(filepaths); return row; } class asyncimageloader extends asynctask<arraylist<string>,bitmap,void>{ progressdialog dialog; private final weakreference<imageview> imageviewreference; public asyncimageloader(imageview imageview) { imageviewreference = new weakreference<imageview>(imageview); } @override protected void onpreexecute() { super.onpreexecute(); dialog = progressdialog.show(callingactivity,"loading images","please wait ...."); } @override protected void doinbackground(arraylist<string>... arrays) { log.d("test","total images :- "+arrays[0].size()); for(int = 0; i< arrays[0].size(); i++) { bitmap map = decodefile(arrays[0].get(i).tostring(), 150, 150); myimages.add(map); publishprogress(map); } return null; } @override protected void onprogressupdate(bitmap... bitmap) { //iv_photo.setimagebitmap(bitmap[0]); if (imageviewreference != null) { imageview imageview = imageviewreference.get(); if (imageview != null) { imageview.setimagebitmap(bitmap[0]); } } } @override protected void onpostexecute(void avoid) { //super.onpostexecute(avoid); dialog.dismiss(); /*for(int = 0; < myimages.size(); ++) { iv_photo.setimagebitmap(myimages.get(i)); }*/ } public bitmap decodefile(string filepath, int width, int hight) { try { file f = new file(filepath); bitmapfactory.options o = new bitmapfactory.options(); o.injustdecodebounds = true; bitmapfactory.decodestream(new fileinputstream(f), null, o); final int required_width = width; final int required_hight = hight; int scale = 1; while (o.outwidth / scale / 2 >= required_width && o.outheight / scale / 2 >= required_hight) scale *= 2; bitmapfactory.options o2 = new bitmapfactory.options(); o2.insamplesize = scale; return bitmapfactory.decodestream(new fileinputstream(f), null, o2); } catch (filenotfoundexception e) { e.printstacktrace(); } return null; } } }
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