与许多复选框的ListView适配器 [英] ListView adapter with many checkboxes

问题描述

我有我的ListView一些小问题。每个项目都有一些信息和一个复选框。这种精细显示出来，我可以选择和取消选中复选框等等等等。

不过，我发现了一些奇怪的行为。可以说，我点击第一个复选框的第一行。如果ListView的小，所以你并不需要向下滚动，这工作正常。但是，如果ListView的大，所以我需要向下滚动才能看到所有的项目，在底部一些随机的项目也成为点击。
同样的行为的其他方式，如果我在列表视图的底部点击复选框，然后滚动起来，一些随机的复选框也点击顶部。如果我点击复选框几个地方，其他地方也有点击复选框相同。我想这发生在GetView（...）被调用，当它更新的意义。然后，它使一些新的复选框，点击，但我不知道为什么。

鸭preciate一些帮助这里！ ：）

我的适配器SSSCE：

 公共类ListViewAdapterSSCCE：BaseAdapter
{
    私人活动myActivity;
    私人的String [] someData;
    私人诠释numberOfElements;
    私人复选框[]盒;    公共ListViewAdapterSSCCE（活动活动）
    {
        this.myActivity =活动;        的for（int i = 0; I＆LT; numberOfElements;我++）
            this.boxes [I] =新的复选框（myActivity）;
    }    公共无效的SetData（字符串[] someData）
    {
        this.someData = someData;
        this.numberOfElements = someData.Length;
    }    公共无效CheckAllBoxes（布尔器isChecked）
    {
        的for（int i = 0; I＆LT; numberOfElements;我++）
            this.boxes [I] .Checked =器isChecked;
    }    公众覆盖的java.lang.Object的GetItem（INT位置）
    {
        返回null;
    }    公众覆盖长GetItemId（INT位置）
    {
        返回10;
    }    公众覆盖诠释计数
    {
        {返回numberOfElements; }
    }    公众覆盖查看GetView（INT位置，查看convertView，父母的ViewGroup）
    {
        如果（convertView == NULL）
        {
            LayoutInflater吹气=（LayoutInflater）myActivity.GetSystemService（Context.LayoutInflaterService）;
            convertView = inflater.Inflate（Resource.Layout.ChildrenList_item，NULL）;
        }        VAR itemBox = convertView.FindViewById＆LT;＆复选框GT;（Resource.Id.checkbox）;
        this.boxes [位置] = itemBox;        VAR的TextView = convertView.FindViewById＆LT;＆TextView的GT;（Resource.Id.item_data）;
        textView.Text = this.someData [位置]        返回convertView;
    }
}
 

解决方案

您可以看到样本code在这里有复选框状态替代修复：

<一个href=\"http://stackoverflow.com/questions/10214271/custom-checkbox-difficulty-in-android/10278905#10278905\">custom复选框困难的android

如果这篇文章可以帮助你，请注明这篇文章作为一个答案。

感谢。

I'm having some minor problems with my listview. Every item has some information and a checkbox. This shows up fine, I can select and deselect checkboxes etc etc.

However I discovered some strange behaviour. Lets say I click the first checkbox at the first row. If the ListView is small so you don't need to scroll down this works fine. But if the ListView is large so I need to scroll down to see all the items, some random item at the bottom also becomes clicked. Same behaviour the other way around, if I click a checkbox at the bottom of the listview and scroll up, some random checkbox is also clicked at top. If i click several checkboxes somewhere, some other place there are the same amount of clicked checkboxes. I figured this happens when GetView(...) is called, meaning when it updates. It then makes some new checkboxes clicked but I don't know why.

Appreciate some help here! :)

SSSCE of my adapter:

public class ListViewAdapterSSCCE : BaseAdapter
{
    private Activity myActivity;
    private string[] someData;
    private int numberOfElements;
    private CheckBox[] boxes;

    public ListViewAdapterSSCCE(Activity activity)
    {
        this.myActivity = activity;

        for (int i = 0; i < numberOfElements; i++)
            this.boxes[i] = new CheckBox(myActivity);
    }

    public void SetData(string[] someData)
    {
        this.someData = someData;
        this.numberOfElements = someData.Length;
    }

    public void CheckAllBoxes(bool isChecked)
    {
        for (int i = 0; i < numberOfElements; i++)
            this.boxes[i].Checked = isChecked;
    }

    public override Java.Lang.Object GetItem(int position)
    {
        return null;
    }

    public override long GetItemId(int position)
    {
        return 10;
    }

    public override int Count
    {
        get { return numberOfElements; }
    }

    public override View GetView(int position, View convertView, ViewGroup parent)
    {
        if (convertView == null)
        {
            LayoutInflater inflater = (LayoutInflater)myActivity.GetSystemService(Context.LayoutInflaterService);
            convertView = inflater.Inflate(Resource.Layout.ChildrenList_item, null);
        }

        var itemBox = convertView.FindViewById<CheckBox>(Resource.Id.checkbox);
        this.boxes[position] = itemBox;

        var textView = convertView.FindViewById<TextView>(Resource.Id.item_data);
        textView.Text = this.someData[position];

        return convertView;
    }
}

解决方案

You can see sample code in here to have an alternative fix for the checkbox state:

custom checkbox difficulty in android

If this post helps you, please mark this post as an answer.

Thanks.

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