Question

我有一个recyclerview来展示不同的产品。我使用自定义适配器和ArrayList将数据绑定到适配器。我想按每个产品对象中的值对列表进行排序。我提到了很多问题，但我找不到合适的问题。任何人都可以使用下面给出的代码建议解决方案

我的模特课

public class Spaceship {

private int rating;
private String name,image_url,pk_id;
private int image;

public float getRating() {
    return rating;
}

public void setRating(int rating) {
    this.rating = rating;
}

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public String getImage() {
    return image_url;
}

public void setImage(String image_url) {
    this.image_url = image_url;
}

public String getPkid() {
    return pk_id;
}

public void setPkid(String pk_id) {
    this.pk_id = pk_id;
}

}

MainActivity代码

Spaceship model;
    planList = new ArrayList<>();
    try {

        jsonArray = resultData.getJSONArray("packages");
        for(int i=0; i<jsonArray.length();i++){

            jsonObject2 = jsonArray.getJSONObject(i);
            JSONObject img_object = jsonObject2.getJSONObject("images");

            Iterator<String> keys= img_object.keys();
            while (keys.hasNext())
            {
                String keyValue = (String)keys.next();
                String valueString = img_object.getString(keyValue);

            }

                model = new Spaceship();
                model.setName(jsonObject2.getString("vehicle_name"));
                model.setRating(1);
                model.setImage(img_object.getString("url1"));
                model.setPkid(jsonObject2.getString("id"));
                planList.add(model);    

        }
        setAdapter();
    } catch (JSONException e) {
        e.printStackTrace();
    }

}

private void setAdapter() {
    adapter = new RecyclerAdapter(MainActivity.this, planList,MainActivity.this);
    rv.setAdapter(adapter);
}

如何按“评级”值对回收者视图进行排序。

Answer 1

1-实施Comparable

public class Spaceship implements Comparable {

private int rating;
private String name,image_url,pk_id;
private int image;

public int getRating() {
    return rating;
}

public void setRating(int rating) {
    this.rating = rating;
}

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public String getImage() {
    return image_url;
}

public void setImage(String image_url) {
    this.image_url = image_url;
}

public String getPkid() {
    return pk_id;
}

public void setPkid(String pk_id) {
    this.pk_id = pk_id;
}
 @Override
    public int compareTo(Spaceship ship) {
        int compareTo=((Spaceship )ship).getRating();
        /* For Ascending order*/
        return this.rating-compareTo;

        /* For Descending order do like this */
        //return compareage-this.rating;
    }


}

在将列表传递给recyclerViewAdapter

之前，

2-

Collections.sort(planList);

Answer 2

尝试自己修改此代码。此方法命令您的适配器中使用的Arraylist。在适配器类中使用它。 // Object Comparator ArrayList mItems

public static void order(ArrayList<ToDoItem> Items) {

    Collections.sort(Items, new Comparator() {

        public int compare(Object o1, Object o2) {

            Boolean x1 = ((ToDoItem) o1).getStatus();
            Boolean x2 = ((ToDoItem) o2).getStatus();
            int sComp = x1.compareTo(x2);

            if (sComp != 0)
            {
                return sComp;
            }
            else
            {
                Date x3 = ((ToDoItem) o1).getDeadLineDate();
                Date x4 = ((ToDoItem) o2).getDeadLineDate();
                return x3.compareTo(x4);
            }
        }
    });
}

Answer 3

重点是您应该已经将已排序的列表设置到适配器中并使用ArrayList进行所有排序，然后通知适配器数据集已更改。

要通过参数比较对象，请使用Comparator

检查此stack thread和文档here

的答案

Recycler视图项按对象项值排序

3 个答案: