Question

我想使用Picasso从json url获取图像，但不知道如何在RecyclerView中使用。的 Picasso.with（上下文）.load（将String.valueOf（users.get（位置）））代入（holder.avatar）;

我在使用方法得到错误时如何定义上下文???

UserAdapter.java

TimePickerDialog

Answer 1

使用此

private Context context;
private ArrayList<User> users = new ArrayList<>();
private LayoutInflater layoutInflater;
//constructor

public UserAdapter(ArrayList<User> users, Context context) {
    this.users = users;
    this.context = context;
    this.layoutInflater=layoutInfalter.from(context);
}

   @Override
public UserViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

    View view = layoutInfalter.inflate(R.layout.items,parent,false);

    return new UserViewHolder(view);
}

@Override
public void onBindViewHolder(UserViewHolder holder, int position) {
    holder.login.setText(users.get(position).getUser_login());
    holder.type.setText(users.get(position).getType());
    Picasso.with(context).
    load(String.valueOf(users.get(position)))
    .into(holder.avatar);

}

@Override
public int getItemCount() {
    return users.size();
}



public class UserViewHolder extends RecyclerView.ViewHolder {

    TextView login;
    TextView type;
    ImageView avatar;

    public UserViewHolder(View itemView) {
        super(itemView);
        login = (TextView)itemView.findViewById(R.id.login);
        type = (TextView)itemView.findViewById(R.id.type);
        avatar = (ImageView)itemView.findViewById(R.id.avatar);
    }
}

Answer 2

尝试从activity或fragment

获取上下文

Context context; 
  public UserAdapter(ArrayList<User> users, Context context) {
        this.users = users;
        this.context = context;
   }

像这样叫你适配器，

UserAdapter adapter = new UserAdapter(usermodel, context);

此处的上下文将activity context或fragment context或getApllicationContext()

现在，您可以调用Picasso从服务器Picasso.with(context).load(String.valueOf(users.get(position))).into(holder.avatar);

获取图像

使用Picasso在Recyclerview中获取图像时出错

2 个答案: