Question

我试过滑行...但无法对它进行处理......“https://www.androidhive.info/2014/07/android-custom-listview-with-image-and-text-using-volley/”在本教程中他们使用了图像类。它是必要的还是Glide或picaso可以解决的？我是新来的android请帮忙。我的主要活动

String name = persons.getString("name");
                    String skills = persons.getString("skills");
                    String image = persons.getString("image");
                // tmp hash map for single person
                HashMap<String, String> person = new HashMap<>();

                // adding each child node to HashMap key => value
                person.put("name", name);
                person.put("skills", skills);

            /*    Glide.with(getApplicationContext ())
                        .load(image)
                        .into();*/
                // adding person toperson list
                personList.add(person);
                ListAdapter adapter = new SimpleAdapter (
                        MainActivity.this, personList,
                        R.layout.persons_list, new String[]{"name", "skills"}, new int[]{R.id.name,
                        R.id.skills});

Answer 1

首先，是的Glide或Picasso是在listviews和recyclerviews中处理图像的简单方法。您需要有一个自定义适配器，因为每个人都有一个要加载的图像。

创建如下的模型类;

public class Person {

private String name;
private String skills;
private String image;

// getters and setters
}

然后你需要一个自定义适配器类，如下所示;

public class PersonAdapter extends ArrayAdapter<Person> {

private Context mContext;
private List<Person> mData;

public PersonAdapter(@NonNull Context context, @NonNull List<Person> data) {
    super(context, 0, data);

    mContext = context;
    mData = data;
}

@NonNull
@Override
public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
    ViewHolder holder;

    if(convertView != null) {
        holder = (ViewHolder) convertView.getTag();
    } else {
        LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = inflater.inflate(R.layout.person_list_item, null);

        holder = new ViewHolder();
        holder.image = convertView.findViewById(R.id.imgPerson);
        holder.name = convertView.findViewById(R.id.tvName);
        holder.skills = convertView.findViewById(R.id.tvSkills);

        convertView.setTag(holder);
    }

    Person person = getItem(position);

    holder.name.setText(person.getName());
    holder.skills.setText(person.getSkills());
    // set image with picasso
    Picasso.with(mContext).load(person.getImage()).into(holder.image);

    return convertView;

}

static class ViewHolder {
    ImageView image;
    TextView name;
    TextView skills;
}
}

使用ViewHolder来保存数据总是好的，因为这样可以轻松处理内存

然后在活动中创建适配器实例并将其附加到列表视图

PersonAdapter adapter = new PersonAdapter(MainActivity.this, persons);
mListView.setAdapter(adapter);

我使用过Picasso，你也可以使用Glide：）

Answer 2

为人创建一个pojo类，然后就可以了使用Gson进行数据解析如下：

 Gson gson = new Gson();
 Persons persons = gson.fromJson(productList, Persons.class);

然后你可以使用这样的滑行：

requestOptions = new RequestOptions();
    requestOptions
            .placeholder(placeholder)
            .error(error)
            .dontTransform()
            .dontAnimate();
    Glide.with(mContext).load(url).apply(requestOptions).into(imageView);

如何使用Glide将解析后的数据转换为包含文本和图像的URL到文本视图和图像视图？

2 个答案: