Picasso 与Listview 可见时加载 快速滑动时候加载

public class ListScroller implements AbsListView.OnScrollListener {
    Context context;

    public ListScroller(Context context) {
        this.context = context;
    }

    @Override
    public void onScrollStateChanged(AbsListView view, int scrollState ) {
        final Picasso picasso = Picasso.with(context);
        if (scrollState == SCROLL_STATE_IDLE || scrollState == SCROLL_STATE_TOUCH_SCROLL) {
            //如果在暂停或者触摸的情况下完成重置
            picasso.resumeTag(context);
        } else {
            //停止更新
            picasso.pauseTag(context);
        }
    }


    @Override
    public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {

    }


}

lv.setOnScrollListener(new ListScroller(MainActivity.this));//滚动事件监听

public class PicassoUtis {//为了性能封装成静态类
  public static void loadImageWithSize(Context context, String imgUrl, ImageView imageView,int y,int x){
      Picasso.with(context).load(imgUrl).resize(y,x).into(imageView);
  }
}