Android uses volley asynchronous loading data Complete concrete Demo sample (ii)

Mainactivity such as the following:

Package Cc.y;import Android.app.activity;import Android.content.context;import android.graphics.bitmap;import Android.graphics.bitmap.config;import Android.os.bundle;import Android.util.lrucache;import Android.widget.imageview;import Com.android.volley.requestqueue;import Com.android.volley.response;import Com.android.volley.volleyerror;import Com.android.volley.toolbox.imageloader;import Com.android.volley.toolbox.imageloader.imagecache;import Com.android.volley.toolbox.ImageLoader.ImageListener; Import Com.android.volley.toolbox.imagerequest;import Com.android.volley.toolbox.networkimageview;import com.android.volley.toolbox.volley;/** * Demo Description: * Last year a project of simple use of volley, see: * http://blog.csdn.net/lfdfhl/article/ details/12223345 * Recently Guolin wrote a few articles specifically introduced volley, so this is more systematic to learn a bit. * In this demo sample, mainly includes: * 1 use imagerequest for imageview load network picture * 2 use Imageloader for ImageView load network picture * 3 Use Networkimageview to load network images 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 code analysis, please see: * http://blog.csdn.net/guolin_blog/article/details/17656437 * 4 Your own definition of xmlrequest and gsonrequest, please see: * http://blog.csdn.net/guolin_blog/article/details/17612763 * * Learning materials: */HTTP blog.csdn.net/guolin_blog/article/details/17482165 * Thank you very much * */public class Mainactivity extends Activity {p Rivate Context mcontext;private requestqueue mrequestqueue;private String murl= "http://avatar.csdn.net/6/6/D/1_ Lfdfhl.jpg ";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 (R.id.imageview);    mnetworkimageview= (Networkimageview) Findviewbyid (R.id.networkimageview); }//Use Imagerequest to load the network picture 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 the network picture 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://http://blog.csdn.net/lfdfhl/article/details/18350601private 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 the network image 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 such as the following:

<?xml version= "1.0" encoding= "Utf-8"?
><relativelayout xmlns:android= "http://schemas.android.com/apk/res/android" android:layout_width= "Fill_ Parent "android:layout_height=" fill_parent "android:orientation=" vertical "> <textview android:layou T_width= "Wrap_content" android:layout_height= "wrap_content" android:text= "learning Volley (ii)" Android:layou T_centerhorizontal= "true"/> <imageview android:id= "@+id/imageview" android:layout_width= " Wrap_content "android:layout_height=" Wrap_content "android:layout_centerhorizontal=" true "Android:lay out_margintop= "50dip"/> <com.android.volley.toolbox.networkimageview android:id= "@+id/networkI Mageview "android:layout_width=" 120dip "android:layout_height=" 120dip "Android:layout_centerhorizonta L= "true" android:layout_margintop= "150dip"/></relativelayout>

Android uses volley to asynchronously load data complete concrete Demo sample (ii)