Question

我无法解决这个问题：我有一个包含10个问题的列表视图。对于每个问题，有三个答案（RadioButtons）在RadioGroup内组织。问题是每次我滚动列表时，RadioButtons会随机选中/取消选中。我知道我必须以某种方式保存答案并且重新加载＆＃34;每次滚动列表时都会出现这些问题，但我无法让它工作。我已经在互联网上查看并研究了这些主题：

这是我的适配器代码：

public class adapterEdit extends ArrayAdapter<AnswerModel> {

private final ArrayList<AnswerModel> mQuestions;
private final Activity mContext;




public adapterEdit(Activity context, ArrayList<AnswerModel> questions){
    super(context,0,questions);
    this.mQuestions = questions;
    this.mContext = context;



}
static class ViewHolder {
    protected TextView text;
    protected RadioButton one;
    protected RadioButton two;
    protected RadioButton three;
}


@Override
public View getView(final int position, View convertView, ViewGroup parent) {


    ViewHolder holder = null;

    if( convertView == null) {
        LayoutInflater inflater = mContext.getLayoutInflater();
        convertView = inflater.inflate(R.layout.list_item, parent, false);

        holder = new ViewHolder();
        holder.text = (TextView) convertView.findViewById(R.id.textOfQuestion);

        holder.one = (RadioButton) convertView.findViewById(R.id.answerOne);
        holder.one.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                int getPosition = (Integer)buttonView.getTag();
                mQuestions.get(getPosition).setSelected(buttonView.isChecked());
            }
        });

        holder.two = (RadioButton) convertView.findViewById(R.id.answerTwo);
        holder.two.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                int getPosition = (Integer)buttonView.getTag();
                mQuestions.get(getPosition).setSelected(buttonView.isChecked());
            }
        });

        holder.three = (RadioButton) convertView.findViewById(R.id.answerThree);
        holder.three.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                int getPosition = (Integer)buttonView.getTag();
                mQuestions.get(getPosition).setSelected(buttonView.isChecked());
            }
        });



        convertView.setTag(holder);
        convertView.setTag(R.id.answerOne, holder.one);
        convertView.setTag(R.id.answerTwo, holder.two);
        convertView.setTag(R.id.answerThree, holder.three);
    } else {
        holder = (ViewHolder) convertView.getTag();
    }

    holder.one.setTag(position);
    holder.two.setTag(position);
    holder.three.setTag(position);


    holder.text.setText(mQuestions.get(position).getQuestion());

    holder.one.setText(mQuestions.get(position).getAnswerOne());
    holder.one.setChecked(mQuestions.get(position).isSelected());

    holder.two.setText(mQuestions.get(position).getAnswerTwo());
    holder.two.setChecked(mQuestions.get(position).isSelected());

    holder.three.setText(mQuestions.get(position).getAnswerThree());
    holder.three.setChecked(mQuestions.get(position).isSelected());




    return convertView;}}

以下是我在listview中使用的对象类：

public class AnswerModel {

private String mQuestion;
private String mAnswerOne;
private String mAnswerTwo;
private String mAnswerThree;
private boolean selected = false;


public AnswerModel (String question, String answerOne, String answerTwo, String answerThree) {
    this.mQuestion = question;
    this.mAnswerOne = answerOne;
    this.mAnswerTwo = answerTwo;
    this.mAnswerThree = answerThree;
}

public String getQuestion(){return mQuestion;}
public String getAnswerOne(){return mAnswerOne;}
public String getAnswerTwo(){return mAnswerTwo;}
public String getAnswerThree(){return mAnswerThree;}
public boolean isSelected() {return selected;}
public void setSelected(boolean selected) {
    this.selected = selected;
}}

列表项的XML：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/mainView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.example.android.harrypotterfanquiz.MainActivity">


<LinearLayout
    android:id="@+id/header"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">

    <TextView
        android:id="@+id/textOfQuestion"
        android:layout_width="match_parent"
        android:layout_height="42dp"
        android:layout_marginTop="10dp"
        android:background="@color/questionColor"
        android:paddingLeft="10dp"
        android:paddingRight="10dp"
        android:text="@string/questionOne"
        android:textAppearance="@style/appearanceBody" />
    <RadioGroup
        android:id="@+id/radioGroup"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="10dp">

        <RadioButton
            android:id="@+id/answerOne"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:paddingLeft="10dp"
            android:text="@string/questionOneA" />

        <RadioButton
            android:id="@+id/answerTwo"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:paddingLeft="10dp"
            android:text="@string/questionOneB" />

        <RadioButton
            android:id="@+id/answerThree"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:paddingLeft="10dp"
            android:text="@string/questionOneC" />
    </RadioGroup>
</LinearLayout>

我知道问题是适配器中的问题。我已经试图解决这个问题一个多星期了。如果您有任何建议或解决方案，我将非常感激。谢谢。

Answer 1

我的应用程序遇到了同样的问题。我解决了在ViewHolder中保存唯一模型字段。然后我在设置Checkbox之前每次都检查一下，如果模型与ViewHolder具有相同的唯一字段。只有这样，Checkbox设置为正确的条件，如下所示：

if(holder.uniqueField == mQuestions.get(position).uniqueField) {
    holder.one.setChecked(mQuestions.get(position).isSelected());
}

不是最干净，但它是有效的。

RadioGroup中的RadioButtons在ListView中随机选中/取消选中

1 个答案: