Android如何按列对列表视图中的对象列表进行排序

发布于 2024-12-05 14:22:13 字数 134 浏览 0 评论 0原文

我在android列表视图中使用适配器绑定类对象列表，列表视图有3个列标题（3个标题按钮），每个标题都有单击事件，现在我想按列对列表视图进行排序意味着当我单击第一个标题列时，数据相对于第一列排序，我单击第二个标题相对于第二列排序数据。我该如何做到这一点。

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空气里的味道 2024-12-12 14:22:13

前面有大量伪代码，我们已警告您。

假设您有一个 Foo 类，

class Foo{

private int param1;
private float param2;
private String param3;
}

现在创建 3 个比较器，一个用于您要排序的每个成员。最好使其成为同一类的静态成员。

class Foo
{
  public static Comparator PARAM1_COMPARATOR = <defination>;
  public static Comparator PARAM2_COMPARATOR = <defination>;
  public static Comparator PARAM3_COMPARATOR = <defination>;
}

在您的活动中，具有此函数 refreshList() （或类似的函数），当要更改排序顺序时会调用该函数。

void refreshList()
{
  List<Foo> list = //say this is your list

  //Pro tip: User a switch case instead.

  if(Sort_by_param1)
   Collections.sort(list, Foo.PARAM1_COMPARATOR);
  if(Sort_by_param2)
   Collections.sort(list, Foo.PARAM2_COMPARATOR);
  if(Sort_by_param3)
   Collections.sort(list, Foo.PARAM3_COMPARATOR);

  adapter.notifyDatasetChanged() or call setAdapter again with the new list.
}

Loads of pseudo code ahead, you've been warned.

Say you have a class Foo

class Foo{

private int param1;
private float param2;
private String param3;
}

Now make 3 Comparators, one for each member you want to sort with. Preferably make it a static member of the same class.

class Foo
{
  public static Comparator PARAM1_COMPARATOR = <defination>;
  public static Comparator PARAM2_COMPARATOR = <defination>;
  public static Comparator PARAM3_COMPARATOR = <defination>;
}

In your activity, have this function refreshList() (or something of that sort ) which is called when the sorting order is to be changed.

void refreshList()
{
  List<Foo> list = //say this is your list

  //Pro tip: User a switch case instead.

  if(Sort_by_param1)
   Collections.sort(list, Foo.PARAM1_COMPARATOR);
  if(Sort_by_param2)
   Collections.sort(list, Foo.PARAM2_COMPARATOR);
  if(Sort_by_param3)
   Collections.sort(list, Foo.PARAM3_COMPARATOR);

  adapter.notifyDatasetChanged() or call setAdapter again with the new list.
}

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别在捏我脸啦 2024-12-12 14:22:13

按照此代码对任何 ArrayList 进行排序

  Collections.sort(empList, new Comparator<Employee>(){
  public int compare(Employee emp1, Employee emp2) {
    return emp1.getFirstName().compareToIgnoreCase(emp2.getFirstName());
  }
});

Follow this code to sort any ArrayList

  Collections.sort(empList, new Comparator<Employee>(){
  public int compare(Employee emp1, Employee emp2) {
    return emp1.getFirstName().compareToIgnoreCase(emp2.getFirstName());
  }
});

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~没有更多了~