Android batch images loaded into the classic series--afinal framework to implement asynchronous cache loading of pictures

I. Descriptive narrative of the problem

In the previous series, we used the volley and xutil frameworks to implement the cache loading of images, and then we'll cover the use of the afinal framework.

Afinal is an Android HTTP framework, SQLite ORM, and IOC framework. make it more easy to use, Afinal's purpose is concise, high-speed. After the way of contract configuration, try one line of code complete all things, code intrusion is small, in the three is recommended. Here we mainly use the HTTP framework of the FINALHTTP and Finalbitmap components to implement network image loading

Case Introduction-- To achieve a picture news tour:

Ii. main components of the case

1. Finalhttp Usage :　　 finalhttp fh=new finalhttp ();

　　(1) Send post mode request

        Fh.post (URL, new ajaxcallback<string> () {            @Override public            void OnFailure (Throwable t, String strMsg) {// Request failed call                Super.onfailure (T, STRMSG);            }            @Override public            void onloading (Long count, long current) {//The request process does not have a second callback                super.onloading (count, current);            }            @Override public            void OnStart () {//starts an asynchronous request when                Super.onstart () is called;            }            @Override public            void onsuccess (String t) {//Request successful invocation and accept return result                            });

(2) Send Get method request

Fh.get (URL, callBack), using the same post method

(3) Download file

　　The method parameters represent the URL of the downloaded file, the file save target, the Ajaxcallback callback method, respectively.

Fh.download (URL, "/mnt/sdcard/21-sun.apk", new Ajaxcallback<file> () {            @Override public            void Onloading ( Long count, long current) {                //TODO auto-generated method stub                tvprocess.settext ("Download Progress" + (Current/count));            }            @Override public            void onsuccess (File f) {//requests a successful call and accepts the return result                Tvfilename.settext (f==null?
"": F.getabsolutefile (). toString ());            }        );

2. Pass the number of references to the service side

Ajaxparams params=new ajaxparams ();//Set Request reference Params.put ("category", "Today");

Call Fh.get (Url,params,ajaxcallback) or Fh.post (Url,params,ajaxcallback) method to pass data

　　JSP Service side

by Request.getparameter ("category"), obtaining text references

You can also upload files

Params.put ("Profile_picture", New File ("/mnt/sdcard/head.jpg")) or

Params.put ("Profile_picture", InputStream);

　　Service side

Uploads can be implemented using the Commfileupload component

3. Finalbitmap cache and asynchronously load network pictures

    Create Finalbitmap, and set the location of the file cache, the percentage of memory cache (e.g. 1/8 of system memory)    Finalbitmap    fb=finalbitmap.create (this, Diskcachepath, memorycachesizepercent);    To configure. Do not set    fb.configloadingimage (R.DRAWABLE.DEFAULT_BIG);//Set the picture to display when the picture is loading fb.configloadfailimage ( R.DRAWABLE.ERROR_BIG)//Set picture to display when picture loading fails

The configuration methods are also:

Configbitmapmaxheight (int bitmapheight)//Configure the maximum height of the default picture     configbitmapmaxwidth (int bitmapwidth)//Configure the maximum width of the default picture     Configdisplayer (Displayer displayer)//Set up the display, for example, to display the animation during the display, etc.   

Last Call display () to complete the loading of the picture:

<span style= "White-space:pre" ></span>//the first parameter represents the UI for displaying the picture. The second parameter is the picture network address
<span style= "White-space:pre" ></span>fb.display (View,url);//load the picture. First loaded from the cache, the memory is not loaded from the network    

Three, the case complete code

1. Sunnewsapplication Components

public class Sunnewsapplication extends application {    private finalbitmap fb;    @Override public    void OnCreate () {        fb=finalbitmap.create (this);        Fb.configloadingimage (R.DRAWABLE.DEFAULT_BIG)///  Set picture to display when the picture is loading    } public    Finalbitmap Getfinalbitmap () {        return fb;    }}

2. Write the adapter

public class Morestylenewslistviewadapter extends Baseadapter {private Activity mactivity;    Private list<newsitem> newslist;    Private Finalbitmap Imageloader;        Public Morestylenewslistviewadapter (Activity mactivity,list<newsitem> newslist) {this.mactivity=mactivity;        This.newslist=newslist;    Imageloader= ((sunnewsapplication) mactivity.getapplication ()). Getfinalbitmap ();    } private final int type_count=2; /** * Return data item display type Data * 0 1 2 */@Override public int getitemviewtype (int position) {//TOD O auto-generated method stub return newslist!=null?
Newslist.get (position). GetStyle ():-1;        }/** * Returns the number of types */@Override public int getviewtypecount () {//TODO auto-generated method stub    return type_count; } @Override public int getcount () {//TODO auto-generated Method Stub log.d ("Jereh", "GetCount ()")        ;    return Newslist.size (); } @Override public Object getItem (int position) {//TODO auto-generated Method Stub log.d ("Jereh", "ge        TItem () ");    return Newslist.get (position); } @Override public long getitemid (int position) {//TODO auto-generated Method Stub log.d ("Jereh", "ge        Titemid () ");    return position; } @Override public View getView (int position, view Convertview, ViewGroup parent) {//TODO auto-generated Me        Thod stub viewholder holder=null;        NewsItem Item=newslist.get (position);            if (convertview==null) {holder=new viewholder ();            Convert Layout.xml to viewSwitch (Item.getstyle ()) {case 0:convertview=layoutinflater.from (mactivity). Inflate (r.layout.new                S_ITEM1, NULL);                holder.ivimg1= (ImageView) Convertview.findviewbyid (r.id.ivnewsimg);            Break                Case 1:convertview=layoutinflater.from (mactivity). Inflate (r.layout.news_item2, NULL);                holder.ivimg1= (ImageView) Convertview.findviewbyid (R.ID.IVIMG1);                Holder.ivimg2= (ImageView) Convertview.findviewbyid (R.ID.IVIMG2);                holder.ivimg3= (ImageView) Convertview.findviewbyid (R.ID.IVIMG3);            Break                } holder.tvtilte= (TextView) Convertview.findviewbyid (r.id.tvtitle);        Convertview.settag (holder);//Record a logo}else{holder= (viewholder) Convertview.gettag ();        }//Bind data to UI elements Holder.tvTilte.setText (Item.gettitle ()); Imageloader.display (HOLDER.IVIMG1, Item.getimgurl () [0]);//load the picture. First loaded from the cache, the memory is no longer loaded from the network switch (itEm.getstyle ()) {case 1:imageloader.display (Holder.ivimg2, Item.getimgurl () [1])//Load picture, first load from cache, inside                The Imageloader.display (HOLDER.IVIMG3, Item.getimgurl () [2]) is loaded from the network and loaded into the cache, and the memory is not loaded from the network        Break                } log.d ("Jereh", "GetView ()");    return convertview;        } private class viewholder{private TextView tvtilte;        Private ImageView IVIMG1;        Private ImageView IvImg2;                Private ImageView IVIMG3; }}

3 , writing maintactivity

public class Mainactivity extends Activity {private Radiogroup rgchannel;    Private list<newsitem> newslist=new arraylist<newsitem> ();    Private Morestylenewslistviewadapter adapter;    Private ListView Newslistview;        @Override protected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);            Setcontentview (R.layout.activity_home);        Initview ();        RequestData ();        } private void Initview () {rgchannel= (Radiogroup) Super.findviewbyid (R.id.rgchannel);        Rgchannel.check (R.id.rbtoday);        newslistview= (ListView) Super.findviewbyid (r.id.lvnews);        Adapter=new Morestylenewslistviewadapter (this,newslist);            Newslistview.setadapter (adapter); /** * Asynchronous request for network data */private void RequestData () {String url= "http://192.168.0.10        7:8080/21-sun/newslistservlet ";            Finalhttp fh=new finalhttp (); Ajaxparams params=new ajaxparams ();//Setup pleaseNumber of Params.put ("category", "Today"); Fh.post (URL, params,new ajaxcallback<string> () {@Override public void onfailure (Throwable t, S            Tring STRMSG) {//Request failed call//TODO auto-generated Method Stub log.d ("Jereh", STRMSG); } @Override public void onsuccess (String t) {//request successfully called.                and accept the return result//TODO auto-generated method stub Gson gson=new Gson ();                List List=gson.fromjson (T, new typetoken<arraylist<newsitem>> () {}.gettype ());                Newslist.addall (list);            Adapter.notifydatasetchanged ();    }                    }); }

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Jerry Education
Source:http://blog.csdn.net/jerehedu/
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Android batch images loaded into the classic series--afinal framework to implement asynchronous cache loading of pictures