Android's Picasso

Brief introduction:

Picasso is an open source Android graphics Cache library for square company. You can implement image download and caching functions.

Characteristics:

1. Load the network or local image and automatically cache the processing;

2. Chaining calls;

3. Graphics conversion operations, such as transformation size, rotation, etc., provide an interface to allow users to customize the conversion operation;

4. Recycle and cancel the current download function in adapter;

Compare to Universal-imageloader Library:

1. Have efficient network image download and cache performance;
2.universal-imageloader function, flexible use configuration;
3.Picasso use complex image compression conversion to reduce memory consumption as much as possible;
4. In the adapter need to cancel already not in the field of view of the ImageView picture resource loading, otherwise it will cause the picture dislocation, Picasso has solved the problem;

Usage:

1. Picture conversion: Convert pictures to fit layout size and reduce memory footprint
Picasso.with (context). Load (URL). Resize (). Centercrop (). into (ImageView);
Download in 2.Adapter: Adapter reuse will be automatically detected, Picasso will cancel the last load;
3. Blank or error placeholder picture setting method and local resource file loading method;

4.Picasso use chain call to load and process the image mode;

5. In addition to loading the network image, Picasso also supports loading resources, assets, files, content providers local resource files;

The following implements a ListView display network Picture:

Here are four web recipe images, add a new dish in the code:

Denotes a vegetable (vegetable, egg, meat, etc.) public class Dish {private string Imgurl;//Picture address private string name;//dish name private string price;// Menu public Dish (String imgurl, string name, string price) {This.imgurl = Imgurl;this.name = Name;this.price = Price;} Public String Getimgurl () {return imgurl;} public void Setimgurl (String imgurl) {this.imgurl = Imgurl;} Public String GetName () {return name;} public void SetName (String name) {this.name = name;} Public String GetPrice () {return price;} public void Setprice (String price) {this.price = Price;}}

in the main interface class, call the Load method to load the network picture and call the Into method to set the picture to a component such as ImageView:

Import Java.util.arraylist;import android.app.activity;import Android.os.bundle;import android.view.LayoutInflater ; Import Android.view.view;import Android.view.viewgroup;import Android.widget.baseadapter;import Android.widget.imageview;import Android.widget.listview;import Android.widget.textview;import Com.squareup.picasso.picasso;public class Mainactivity extends Activity {private static final String Base_url = "http://i mg1.3lian.com/img2011/w1/106/85/"; @Overrideprotected void OnCreate (Bundle savedinstancestate) {super.oncreate ( Savedinstancestate); Setcontentview (R.layout.activity_main); arraylist<dish> dishlist = new arraylist<dish> ();d Ishlist.add (New Dish (Base_url + "42.jpg", "Poached Fillet", "38.00" );d Ishlist.add (New Dish (Base_url + "34.jpg", "Fried meat", "18.00"));d Ishlist.add (New Dish (Base_url + "37.jpg", "stir fry vegetables", "15.00 ");d Ishlist.add (New Dish (Base_url +" 11.jpg "," Golden Roast Duck "," 36.00 "));d Ishlist.add (New Dish (Base_url +" 12.jpg "," Vermicelli Stew "," 20.00 ")); ListView Mlistview = (ListView) This.finDviewbyid (R.id.listview); Mainlistviewadapter adapter = new Mainlistviewadapter (dishlist); Mlistview.setadapter (adapter);} ListView Adapter Private Class Mainlistviewadapter extends Baseadapter {private arraylist<dish> Dishlist;public Mainlistviewadapter (arraylist<dish> list) {this.dishlist = list;} @Overridepublic int GetCount () {return dishlist.size ();} @Overridepublic Object getItem (int position) {return dishlist.get (position);} @Overridepublic long Getitemid (int position) {return position;} @Overridepublic view GetView (int position, view Convertview, ViewGroup parent) {Listviewitemholder item = null;if (convert View = = null) {Convertview = Layoutinflater.from (mainactivity.this). Inflate (R.layout.main_listview_item, null); item = New Listviewitemholder (); Item.img_iv = (ImageView) Convertview.findviewbyid (r.id.imageview1); Item.name_textview = ( TextView) Convertview.findviewbyid (r.id.textview1); Item.price_textview = (TextView) Convertview.findviewbyid ( R.ID.TEXTVIEW2); Convertview.settag(item);} else {item = (Listviewitemholder) Convertview.gettag ();} Dish Dish = dishlist.get (position);//This is where the network image is loaded asynchronously Picasso.with (mainactivity.this). Load (Dish.getimgurl ()). into ( ITEM.IMG_IV); Item.name_textview.setText (Dish.getname ()); Item.price_textview.setText (Dish.getprice () + "Yuan"); return Convertview;}} The item component class of the ListView is private class Listviewitemholder {ImageView Img_iv; TextView Name_textview; TextView Price_textview;}}

here is a download link for the entire project, interested in downloading and importing into your own eclipse to run:

Android Picasso

Android's Picasso