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GRADLE：

dependencies {
       compile 'com.squareup.picasso:picasso:2.5.1'}

在AndroidManifest.xml中添加INTERNET权限：

给ImageView添加网络图片：

ImageView img = (ImageView)findViewById(R.id.picture);Picasso.with(this).load("https://www.baidu.com/img/bd_logo1.png?where=super").into(img);

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MainActivity传this，赋值mContext

MyListAdapter myListAdapter = new MyListAdapter(this,list);

ListAdapter.java

List
   
     mList;    private Context mContext;    private LayoutInflater myLayoutInflater;    public MyListAdapter(Context context,List
    
      list){
           mList = list;        myLayoutInflater = LayoutInflater.from(context);        mContext = context;    }
    
   

优化

public View getView(int i, View view, ViewGroup viewGroup) {
           ViewHolder holder;        ItemBean item = mList.get(i);        if(view==null){
               view=myLayoutInflater.inflate(R.layout.activity_items,null);            holder= new ViewHolder();            holder.imageView = (ImageView)view.findViewById(R.id.picture);            holder.title = (TextView)view.findViewById(R.id.tv1);            holder.content = (TextView)view.findViewById(R.id.tv2);            view.setTag(holder);        }        else {
               holder = (ViewHolder) view.getTag();        }        holder.title.setText(item.getItemTitle());        holder.content.setText(item.getItemContent());        //holder.imageView.setImageResource(item.getItemImageResourceId());        //改成利用Picasso框架加载图片        Picasso.with(mContext).load(item.getItemImageResourceId()).into(holder.imageView);        view.setBackgroundResource(item.getBackgroundColor());        return view;    }

ItemBean.java

public class ItemBean{
       private int ItemImageResourceId;    private String ItemTitle;    private String ItemContent;    private int BackgroundColor;    public ItemBean(int itemImageResourceId, String itemTitle,String itemContent,int backgroundColor){
           this.ItemImageResourceId = itemImageResourceId;        this.ItemTitle = itemTitle;        this.ItemContent = itemContent;        this.BackgroundColor = backgroundColor;    }    public String getItemTitle(){
           return ItemTitle;    }    public String getItemContent(){
           return ItemContent;    }    public int getItemImageResourceId(){
           return ItemImageResourceId;    }    public int getBackgroundColor(){
           return BackgroundColor;    }}

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