Android leverages volley asynchronous load data Full Detail example (ii)

Source: Internet
Author: User

Mainactivity as follows:
Package Cc.y;import;import Android.content.context;import;import;import Android.os.bundle;import Android.util.lrucache;import Android.widget.imageview;import;import;import;import;import;import; Import;import;import;/** * Demo Description: * Last year a project was simply used volley, see: * details/12223345 * Recently Guolin wrote a few articles detailed introduction volley, so in this comparative systematic study. * In this example, the main include: * 1 use imagerequest for imageview load network picture * 2 use Imageloader for ImageView load network picture * 3 Use Networkimageview to load network pictures for ImageView * * NOTE: * 1 introduction of the JAR package Volley.jar * 2 network permissions <uses-permission android:name= "Android.perm Ission. InterneT "/> * 3 volley source analysis, see: * * 4 custom XMLRequest and Gsonrequest , see: * * * Learning materials: * article/details/17482165 * Thank you very much * */public class Mainactivity extends Activity {private Context MCONTEXT;PR Ivate requestqueue mrequestqueue;private String murl= "";p rivate ImageView Mimageview;private imagerequest mimagerequest;private imageloader mimageloader;private ImageListener mImageListener;    Private Networkimageview Mnetworkimageview;        @Override public void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);        Setcontentview (R.layout.main);        Init ();        Volley_imagerequest ();        Volley_imageloader ();    Volley_networkimageview ();    } private void Init () {mcontext=this;    mimageview= (ImageView) Findviewbyid (;mnetworkimageview= (Networkimageview) Findviewbyid (; }//Use Imagerequest to load network pictures for imageview private void Volley_imagerequest () {mrequestqueue = Volley.newrequestqueue (mconte XT); mimagerequest = new Imagerequest (Murl, New response.listener<bitmap> () {@Override public void Onresponse (BITM AP Response) {Mimageview.setimagebitmap (response);}}, 0, 0, config.argb_8888, new Response.errorlistener () {@O verridepublic void Onerrorresponse (volleyerror error) {System.out.println ("Get picture failed, so load a default picture"); Mimageview.setimagedrawable (Mcontext.getresources (). getdrawable (R.drawable.ic_launcher));}); Mrequestqueue.add (mimagerequest);} Use Imageloader to load network pictures for imageview private void Volley_imageloader () {mrequestqueue = Volley.newrequestqueue (Mcontext); Mimageloader=new Imageloader (Mrequestqueue, New Imagecacheimpl ()); Mimagelistener=imageloader.getimagelistener ( Mimageview, R.drawable.ic_launcher, R.drawable.ic_launcher); Mimageloader.get (Murl, mimagelistener);//mImageLoadEr.get (Murl, mimagelistener,250,250);} Using LRUCache to implement a picture caching mechanism//See also:// class Imagecacheimpl  Implements Imagecache {private lrucache<string, bitmap> mlrucache;public Imagecacheimpl () {int maxSize = 15 * 1024 * 1024;mlrucache = new lrucache<string, bitmap> (maxSize) {@Overrideprotected int sizeOf (String key, Bitmap Bitmap) {R Eturn bitmap.getrowbytes () * Bitmap.getheight ();};} @Overridepublic Bitmap getbitmap (String URL) {return mlrucache.get (URL);} @Overridepublic void Putbitmap (String url, Bitmap Bitmap) {mlrucache.put (URL, Bitmap);}} Use Networkimageview to load network pictures for imageview private void Volley_networkimageview () {mrequestqueue = Volley.newrequestqueue ( Mcontext); mimageloader=new Imageloader (Mrequestqueue, New Imagecacheimpl ()); Mnetworkimageview.setdefaultimageresid (R.drawable.ic_launcher); Mnetworkimageview.seterrorimageresid ( R.drawable.ic_launcher); Mnetworkimageview.setimageurl (Murl, Mimageloader);}}

Main.xml as follows:

<?xml version= "1.0" encoding= "Utf-8"? ><relativelayout xmlns:android= " Android "Android:layout_width=" Fill_parent "android:layout_height=" fill_parent "android:orientation=" vertical "&G    T <textview android:layout_width= "wrap_content" android:layout_height= "wrap_content" android:text= "study Xi Volley (ii) "android:layout_centerhorizontal=" true "/> <imageview android:id=" @+id/imagevi EW "android:layout_width=" wrap_content "android:layout_height=" Wrap_content "Android:layout_centerhor         Izontal= "true" android:layout_margintop= "50dip"/> <        Android:id= "@+id/networkimageview" android:layout_width= "120dip" android:layout_height= "120dip" Android:layout_centerhorizontal= "true" android:layout_margintop= "150dip"/></relativelayout>

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