（Android图片内存优化）Picasso加载图片 教程。。详细版

Picasso 是 Android 上一个强大的图片下载和缓存库。

示例代码：

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

@Override public void getView( int position, View convertView, ViewGroup parent) {
  SquaredImageView view = (SquaredImageView) convertView;
  if (view ==  null ) {
    view =  new SquaredImageView(context);
  }
  String url = getItem(position);

  Picasso.with(context).load(url).into(view);
}

//图像处理
Picasso.with(context)
  .load(url)
  .resize( 50 ,  50 )
  .centerCrop()
  .into(imageView)