android– 如何在自定义ListView适配器中处理RadioGroup的onCheckedChangeListener

概述我正在开发一个具有自定义布局的列表视图的应用程序,如下所示：它在RadioGroup中有4个RadioButtons和一个TextView.实际上,它将显示为问题(TextView)和答案(RadioButtons)列表.上面的视图在我的自定义适配器中膨胀,该适配器扩展了ArrayAdapter<Question>.问题是,我应该如何在自定

我正在开发一个具有自定义布局的列表视图的应用程序,如下所示：
它在RadioGroup中有4个Radiobuttons和一个TextVIEw.实际上,它将显示为问题(TextVIEw)和答案(Radiobuttons)列表.上面的视图在我的自定义适配器中膨胀,该适配器扩展了ArrayAdapter< Question>.

问题是,我应该如何在自定义适配器中维护Radiobutton的状态？按下/选中Radiobutton并向下滚动列表时,适配器会自动回收视图,并且Radiobutton状态将丢失.

>那么,任何人都可以指导任何关于此的链接/信息吗？
>或者我应该如何实施问题答案清单？

第一条遵循：
http://www.vogella.de/articles/AndroidListView/article.html

上面的链接使用CheckBox,类似的方式我想使用RadioGroup(Radiobuttons)而不是CheckBoxes.

解决方法:

它很容易适应该教程,因此您可以使用RadioGroup而不是CheckBox.贝娄就是一个例子(我使用了一个带有4个Radiobutton的RadioGroup).首先,您必须修改Model类,以便它可以保存新数据：

public class Model {    String question; // hold the question    int current = NONE; // hold the answer picked by the user, initial is NONE(see below)    public static final int NONE = 1000; // No answer selected    public static final int ANSWER_ONE_SELECTED = 0; // first answer selected    public static final int ANSWER_TWO_SELECTED = 1; // second answer selected    public static final int ANSWER_THREE_SELECTED = 2; // third answer selected    public static final int ANSWER_FOUR_SELECTED = 3; // forth answer selected    public Model(String question) {        this.question = question;      }}

然后修改getVIEw()方法以根据模型设置视图：

@OverrIDe        public VIEw getVIEw(int position, VIEw convertVIEw, VIEwGroup parent) {            VIEw v = convertVIEw;            VIEwHolder holder = null;            if (v == null) {                v = inflater.inflate(R.layout.the_row, parent, false);                holder = new VIEwHolder(v);                v.setTag(holder);                holder.group                        .setonCheckedchangelistener(new RadioGroup.OnCheckedchangelistener() {                            public voID onCheckedChanged(RadioGroup group,                                    int checkedID) {                                Integer pos = (Integer) group.getTag(); // To IDentify the Model object i get from the RadioGroup with getTag()                                                                        //  an integer representing the actual position                                 Model element = List.get(pos);                                          switch (checkedID) { //set the Model to hold the answer the user picked                                case R.ID.answer0:                                    element.current = Model.ANSWER_ONE_SELECTED;                                    break;                                case R.ID.answer1:                                    element.current = Model.ANSWER_TWO_SELECTED;                                    break;                                case R.ID.answer2:                                    element.current = Model.ANSWER_THREE_SELECTED;                                    break;                                case R.ID.answer3:                                    element.current = Model.ANSWER_FOUR_SELECTED;                                    break;                                default:                                    element.current = Model.NONE; // Something was wrong set to the default                                }                            }                        });            } else {                holder = (VIEwHolder) v.getTag();            }            holder.group.setTag(new Integer(position)); // I passed the current position as a tag            holder.t.setText(List.get(position).question); // Set the question body            if (List.get(position).current != Model.NONE) {                Radiobutton r = (Radiobutton) holder.group.getChildAt(List                        .get(position).current);                r.setChecked(true);            } else {                holder.group.clearCheck(); // This is required because although the Model Could have the current                                            // position to NONE you Could be dealing with a prevIoUs row where                                           // the user already picked an answer.             }            return v;        }

然后是VIEwHolder类：

class VIEwHolder {    TextVIEw t = null;    RadioGroup group;    VIEwHolder(VIEw v) {        t = (TextVIEw) v.findVIEwByID(R.ID.textVIEw1);        group = (RadioGroup) v.findVIEwByID(R.ID.group_me);    }}

带有RadioGroup的xml布局：

<?xml version="1.0" enCoding="utf-8"?><linearLayout xmlns:androID="http://schemas.androID.com/apk/res/androID"    androID:layout_wIDth="match_parent"    androID:layout_height="match_parent"    androID:orIEntation="vertical" >    <TextVIEw        androID:ID="@+ID/textVIEw1"        androID:layout_wIDth="wrap_content"        androID:layout_height="wrap_content" />    <RadioGroup        androID:ID="@+ID/group_me"        androID:layout_wIDth="fill_parent"        androID:layout_height="wrap_content"        androID:orIEntation="horizontal" >        <Radiobutton            androID:ID="@+ID/answer0"            androID:layout_wIDth="wrap_content"            androID:layout_height="wrap_content"            androID:checked="false"            androID:text="Ans0" />        <Radiobutton            androID:ID="@+ID/answer1"            androID:layout_wIDth="wrap_content"            androID:layout_height="wrap_content"            androID:checked="false"            androID:text="Ans1" />        <Radiobutton            androID:ID="@+ID/answer2"            androID:layout_wIDth="wrap_content"            androID:layout_height="wrap_content"            androID:checked="false"            androID:text="Ans2" />        <Radiobutton            androID:ID="@+ID/answer3"            androID:layout_wIDth="wrap_content"            androID:layout_height="wrap_content"            androID:checked="false"            androID:text="Ans3" />    </RadioGroup></linearLayout>

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