Question

我撰写了来自ArrayAdapter的习俗接触书。让我们假设,名单仅有三个要素。我在每打听电文的电话中都收发了字眼和信条。我注意到,观点反对没有正确归还。我在这里做了一些错误的事情?

private class ContactListAdapter extends ArrayAdapter<ContactItem> {
... ...
    @Override
    public View getView(int aPosition, View aConvertView, ViewGroup aParent) {
        Log.d(TAG, "Inside ContactListAdapter.getView()");
        if(aConvertView==null) {
             Log.d(TAG, "ConvertView is null");
             // Inflate view...
        }
        Log.d(TAG, "Pos: " + aPosition + " View: " + aConvertView.hashCode());
        return aConvertView;
    }

这里是初步意见生成的标志:

D/ContactsActivity(  759): Inside ContactListAdapter.getView()
D/ContactsActivity(  759): ConvertView is null
D/ContactsActivity(  759): Pos: 0 View: 1156974184
D/ContactsActivity(  759): Inside ContactListAdapter.getView()
D/ContactsActivity(  759): ConvertView is null
D/ContactsActivity(  759): Pos: 1 View: 1157007416
D/ContactsActivity(  759): Inside ContactListAdapter.getView()
D/ContactsActivity(  759): ConvertView is null
D/ContactsActivity(  759): Pos: 2 View: 1157027832

当我点击名单上的第三点时,就会出现记录(不知道如何交换第一和最后元素的散射编码)。我的Click方法仅仅使名单上的少数实体:

D/ContactsActivity(  759): Inside ContactListAdapter.getView()
D/ContactsActivity(  759): Pos: 0 View: 1157027832
D/ContactsActivity(  759): Inside ContactListAdapter.getView()
D/ContactsActivity(  759): Pos: 1 View: 1157007416
D/ContactsActivity(  759): Inside ContactListAdapter.getView()
D/ContactsActivity(  759): Pos: 2 View: 1156974184

当我点击第二个要素时,标识:

D/ContactsActivity(  759): Inside ContactListAdapter.getView()
D/ContactsActivity(  759): Pos: 0 View: 1156974184
D/ContactsActivity(  759): Inside ContactListAdapter.getView()
D/ContactsActivity(  759): Pos: 1 View: 1157007416
D/ContactsActivity(  759): Inside ContactListAdapter.getView()
D/ContactsActivity(  759): Pos: 2 View: 1157027832

这一点一再得到观察,每次只交换头和最后入境的散射编码。这可能是什么原因?

Answer 1

兑换观点被用来重复看待适应者的观点,因此,如果你展示一个名单,并假定你的屏幕能够显示一个时的5行,然后在5行中形成看法。观点仍然无效,但当你下台时,您的适应者为您的适应者的观点提出了新的看法,因此,清单中的第六项内容可以重新使用。 1. 导言

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