android - 除了使用字符串之外，如何在列表中显示数据？

Question

我对要在 ListView 中显示的数据使用了线性布局(如下所示)。我怎样才能实现这一点？通过使用以下代码，我得到空白 ListView ，不知道为什么!下面是 ListView 项目

这是我正在使用的代码

public class ListAdapter extends BaseAdapter {

private LayoutInflater mInflater;
private Context context;
private ArrayList<Data> friendListData;

private class ViewHolder {
    public TextView name;
    public ImageView pro_image;

    public TextView comment;

}

public ListAdapter(Context context, ArrayList<Data> friendDataList) {
    // TODO Auto-generated constructor stub
    super();
    this.friendListData = friendDataList;
    this.context = context;

}

// @Override
public int getCount() {
    return friendListData.size();
}

// @Override
public Object getItem(int position) {
    return position;
}

// @Override
public long getItemId(int position) {
    return position;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {

    ViewHolder holder = null;

    mInflater = (LayoutInflater) context
            .getSystemService(Activity.LAYOUT_INFLATER_SERVICE);

    if (convertView == null) {

        convertView = mInflater.inflate(R.layout.conversation_item, null);

        holder = new ViewHolder();
        holder.name = (TextView) convertView.findViewById(R.id.name);
        holder.comment = (TextView) convertView.findViewById(R.id.comment);
        holder.pro_image = (ImageView) convertView.findViewById(R.id.avatarPic);
        convertView.setTag(holder);

    }
    else {
        holder = (ViewHolder) convertView.getTag();
    }
    Data data = (Data) getItem(position);

    holder.name.setText(data.getName());
    holder.comment.setText(data.getComment());
    holder.pro_image.setImageResource(data.getPro_image());

    return convertView;
}


public class Data {
String name;
String comment;
int pro_image;

     }
  }

在 MainActivity.java 中，我使用这样的适配器

    lv = (ListView) findViewById(R.id.ListView);
    friendsDataList = new ArrayList<Data>();
    adapter = new ListAdapter(MainActivity.this, friendsDataList);

    lv.setAdapter(adapter);

Answer 1

您需要检查您的数组列表大小，例如...

Log.i("====SIZE=======","======>"+friendsDataList.size());  
adapter = new ListAdapter(MainActivity.this, friendsDataList);

在不同的类中声明您的数据。

public class Data {
String name;
String comment;
int pro_image; 
     }

在您的 ArrayList 中添加值以进行测试，例如..

Data data=new Data();
data.name="nidhi";
data.comment="Android developer";

friendDataList.add(data);

Data data=new Data();
data.name="Hardy";
data.comment="Android developer. Ready to help you.";

friendDataList.add(data);

在这一行之前:

adapter = new ListAdapter(MainActivity.this, friendsDataList);