如何在Android的回收视图上对字符串进行排序?

I have a recyclerView full of CardViews that have 2 paramteres (Both of them are Strings), one of those is a title,I would like to have a button to sort them alphabetically based on the tittle.

我有一个回收视图，里面有2个参数(都是字符串)，其中一个是标题，我想要有一个按钮，按字母顺序对它们进行排序。

since it doesn't have too many elements I decided to use the insertion sort which is o(n^2) and this is my implementation:

因为它没有太多的元素,我决定使用插入排序是o(n ^ 2),这是我的实现:

public void ISortDes(String[]strings){
     int j;                  
     String key;                
     int i; 

     for (j = 1; j < strings.length; j++)    
    {
           key = strings[ j ];


             for(i = j - 1; (i >= 0) ; i--)   

          {
                if (key.compareTo(strings[i]) > 0){
                  break;
                }
                 strings[ i+1 ] = strings[ i ];
          }
         strings[ i+1 ] = key;    
     }

        for (int k = 0; k < strings.length; k++){

            System.out.println(strings[k]);


        }

            }

It takes an array of Strings and orders them.

它接受一个字符串数组并对它们进行排序。

And this is the method of my RecyclerView that takes the parameters:

这是我的回收视图的方法它取参数

private void initializeData() {
        categories = new ArrayList<>();

          categories.add(new Categories("CARS", "CARS"));
            categories.add(new Categories("SPORTS", "SPORTS"));
            categories.add(new Categories("GAMING", "GAMING"));
            categories.add(new Categories("GAMBLING", "GAMBLING"));
            categories.add(new Categories("TECH", "TECH"));
            categories.add(new Categories("NATURE", "NATURE"));
            categories.add(new Categories("RANDOM", "RANDOM"));
            categories.add(new Categories("COUSINE", "COUSINE"));
            categories.add(new Categories("HISTORY", "HISTORY"));
            categories.add(new Categories("MUSIC", "MUSIC"));
            categories.add(new Categories("STUDIES", "STUDIES"));

    }

I think that i need to pass somehow that first paramater to a String Array and then sort it.

我认为我需要以某种方式将第一个参数传递给一个字符串数组，然后对它进行排序。

The idea is to have the sorting method in a button in the same Activity where the RecyclerView is displayed and when pressed it would have to sort them without going to another Activity.

我们的想法是在一个按钮中有一个排序方法，在同一个活动中显示回收视图，当它被按下时，它必须对它们进行排序，而不需要进入另一个活动。

I'm kinda lost here.

我有点失落。

In resume what i'm trying to do is to have a buttom that orders the elements (which in this case are CardViews) of a RecyclerView alphabetically based on the "title" paramater.

在简历中，我要做的是有一个按钮，按字母顺序，按字母顺序排列元素(在本例中是CardViews)。

Is my idea right, do you have another way to do this, or what should i do in order to accomplish this?

我的想法是对的，你有别的办法吗?或者我该怎么做才能实现?

Thanks a million.

由于一百万年。

1 个解决方案

#1

The easiest way to sort a list is to use java.util.Collections

排序列表的最简单方法是使用java.util.Collections

Collections.sort(categories, new Comparator<Categories>() {
            @Override
            public int compare(Categories lhs, Categories rhs) {
                return lhs.title.compareTo(rhs.title);
            }
        });

This will compare the title character by character. and will sort your list from a to z.

这将按字符对标题字符进行比较。将你的列表从a到z排序。

Don't forget after the modification to notify the list that the data have changed with notifyDataSetChanged() (from your RecyclerView.Adapter).

在修改之后，不要忘记通知列表，该数据已经通过notifyDataSetChanged()(来自于您的recycle . adapter)进行了更改。

#1