Android开发从放弃到捡起之Picasso

首先先上官网地址：

http://square.github.io/picasso/

Images add much-needed context and visual flair to Android applications. Picasso allows for hassle-free image loading in your application—often in one line of code!

我们经常需要再安卓程序中加载图片，Picasso为我们提供了只要一行代码就能加载图片的的方式

Picasso.with(context).load("http://i.imgur.com/DvpvklR.png").into(imageView);

Transform images to better fit into layouts and to reduce memory size.

修改图片以便适应布局和减少内存大小

Picasso.with(context).load(url).resize(50,50).centerCrop().into(imageView)

Picasso supports both download and error placeholders as optional features.

Picasso同时支持下载和加载错误占位图的可选功能

Picasso.with(context)

.load(url)

.placeholder(R.drawable.user_placeholder)

.error(R.drawable.user_placeholder_error)

.into(imageView);

Resources, assets, files, content providers are all supported as image sources.

支持其他形式的图片资源加载，如drawable资源，assets资源或者手机本地图片资源

Picasso.with(context).load(R.drawable.landing_screen).into(imageView1);   Picasso.with(context).load("file:///android_asset/DvpvklR.png").into(imageView2); Picasso.with(context).load(newFile(...)).into(imageView3);                                            

有几种引用这个库的方式，一种是下载jar包

http://repo1.maven.org/maven2/com/squareup/picasso/picasso/2.5.2/picasso-2.5.2.jar

还有是MAVEN

另外一种是Gradle

compile'com.squareup.picasso:picasso:2.5.2'

OK,自己动手丰衣足食

在Module下的build.gradle下加入
compile'com.squareup.picasso:picasso:2.5.2'

然后在layout中添加几个ImageView

然后在代码中

Picasso.with(this).load(API.IMAGE_URI).into(ivPicasso);//不支持加载gif

Picasso.with(this).load(API.IMAGE_URI).resize(200,200).into(ivPicassoResize);

看看效果吧，啦啦啦