使用数组适配器对列表视图进行排序 [英] Sort listview with array adapter

问题描述

我有一个连接到自定义阵列适配器的列表视图.此列表显示更改数据集的 TCP 连接接收的信息...

I have a listview connected to a custom array adapter. This list shows information received by a TCP connection which changes the dataSet...

我可以使用 sort (Comparator<? super T> Comparator) 对 listview 进行排序，但是当 dataSet 更改时，listview 不再排序...

I am able to sort the listview with sort (Comparator<? super T> comparator), but when the dataSet is changed, the listview is no more sorted...

我可以在每次更改dataSet时使用sort()，但我认为这不是最好的选择...

I can use sort () every time the dataSet is changed, but I think this is not the best option...

我该怎么做?有什么建议吗?

How can I do that? Any suggestions?

编辑

我在实施所提供的解决方案时遇到问题...

I am having problems in implementing the solutions presented...

MyComparatorB.java

public class MyComparatorB implements Comparator<DeviceB> {

private byte orderType;

public MyComparatorB(byte type) {

    this.orderType = type;

}

public int compare(DeviceB lhs, DeviceB rhs) {

    int res = 0;
    if (orderType == SortType.ALPHA) {
            res = (lhs.getName()).compareTo(rhs.getName());
        }
        else if (orderType == SortType.LAST_ACT) {
            res = (rhs.getTime().getTime()).compareTo(lhs.getTime().getTime());
        }
        return res;
    }

}

我的 customArrayAdapter.java 的片段

    @Override
public void notifyDataSetChanged() {
    super.notifyDataSetChanged();
}


//-----------Order the content of the arrayAdapter------------//
public void sort(byte sortType) {

    super.sort(new MyComparatorB(sortType));
    notifyDataSetChanged();
}

在我的 MyActivity.java

myDevAdapter.sort(SortType.ALPHA);

调试时，调用方法super.sort(new MyComparatorB(sortType));，同时调用MyComparatorB的构造函数.但是方法 compare(DeviceB lhs, DeviceB rhs) 从来没有被调用过，我的 arrayList 没有排序......我做错了什么?

When I am debugging, the method super.sort(new MyComparatorB(sortType)); is called and the constructor of MyComparatorB is called too. But the method compare(DeviceB lhs, DeviceB rhs) is never called and my arrayList is not sorted... What I am doing wrong?

推荐答案

我猜你需要在你的适配器中重写 notifyDataSetChanged 方法并在调用它的 super 之前执行排序.见下文:

I guess you need to override notifyDataSetChanged method in your adapter and perform sorting right before calling its super. See below:

@Override
public void notifyDataSetChanged() {
    //do your sorting here

    super.notifyDataSetChanged();
}

这样做会在您调用 notifyDataSetChanged 方法刷新列表项时对列表进行排序.否则，将已排序的列表/数组提供给您的适配器.

Doing so will sort the list whenever you call notifyDataSetChanged method to refresh list items. Otherwise, feed a sorted List/array to your adapter.

或者更优选地，使用 sort 方法在您的适配器中可用以完成工作.

Or more preferably, use the sort method available in your adapter to get the job done.

adapter.sort(new Comparator<String>() {
    @Override
    public int compare(String lhs, String rhs) {
        return lhs.compareTo(rhs);   //or whatever your sorting algorithm
    }
});

这篇关于使用数组适配器对列表视图进行排序的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！