android - RadioGroup 没有在 ListView 中保持正确的状态

Question

我知道 ListView 回收问题并尝试将我的状态保留在模型中，但它似乎不起作用。我读过很多有同样问题的主题，但他们的解决方案对我不起作用，或者我做错了什么。 当我在初始状态下上下滚动 ListView 时，没有任何反应，没错。但是一旦我设置选中任何行中的任何单选按钮，然后上下滚动它，单选按钮就会随机选中。

radio 适配器.java:

public class RadioAdapter extends ArrayAdapter<Question> {

List<Question> mSource;

static class ViewHolder {
    TextView category = null;
    TextView question = null;
    RadioGroup rbGroup = null;

    ViewHolder(View row) {
        this.category = (TextView) row.findViewById(R.id.tvQuestionCategory);
        this.question = (TextView) row.findViewById(R.id.tvQuestion);
        this.rbGroup = (RadioGroup) row.findViewById(R.id.rgIteration);
    }
}

private LayoutInflater mInflater;

public RadioAdapter(Context context, List<Question> mSource) {
    super(context, R.layout.item_question, mSource);
    mInflater = LayoutInflater.from(context);
    this.mSource = mSource;
}

public View getView(final int position, View convertView, ViewGroup parent) {
    ViewHolder holder = null;
    View row = convertView;

    if (row == null) {
        row = mInflater.inflate(R.layout.item_question, null);

        holder = new ViewHolder(row);

        holder.rbGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {

            public void onCheckedChanged(RadioGroup group, int checkedId) {
                //Get position of current group
                Integer pos = (Integer) group.getTag();
                switch (checkedId) {
                    case R.id.rbIterationYes:
                        //Check 'YES' and uncheck 'NO'
                        mSource.get(pos).setYesChecked(true);
                        mSource.get(pos).setNoChecked(false);
                        break;

                    case R.id.rbIterationNo:
                        //Vice versa
                        mSource.get(pos).setNoChecked(true);
                        mSource.get(pos).setYesChecked(false);
                        break;
                }
            }
        });

        row.setTag(holder);
    } else {
        holder = (ViewHolder) row.getTag();
    }
    holder.rbGroup.setTag(new Integer(position));
    holder.category.setText(mSource.get(position).getCategory());
    holder.question.setText(mSource.get(position).getDescription());
    //If no one of buttons isn't checked
    if (!mSource.get(position).isYesChecked() && !mSource.get(position).isNoChecked()) {
        holder.rbGroup.clearCheck();
    }else {
        //We are supposing 'YES' is checked
        int c = 0;
        //Or 'NO' is checked
        if (mSource.get(position).isNoChecked()){
            c = 1;
        }
        //Set checked button
        ((RadioButton)holder.rbGroup.getChildAt(c)).setChecked(true);
    }
    return row;
}

问题.java:

public class Question {

     private Integer id;
     private String category;
     private String description;
     private boolean yesChecked;
     private boolean noChecked;

/* Getters and setters */
}

item_question.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">

<TextView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:textSize="18dp"
    android:id="@+id/tvQuestionCategory"/>
<TextView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:textSize="18dp"
    android:id="@+id/tvQuestion"/>

<RadioGroup
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/rgIteration">
        <RadioButton
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:checked="false"
            android:id="@+id/rbIterationYes"
            android:text="@string/rbIterationYes"
            android:textSize="16dp"/>
        <RadioButton
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:checked="false"
            android:id="@+id/rbIterationNo"
            android:text="@string/rbIterationNo"
            android:textSize="16dp" />
</RadioGroup>

</LinearLayout>

我希望你能帮我找出错误，因为我已经厌倦了寻求解决方案。谢谢

Answer 1

在为您的 RadioGroup 设置选中或未选中之前，您应该禁用监听器，如下所示。希望这可以帮助。 将您的适配器更改为此

public class RadioAdapter extends ArrayAdapter<Question> {

    List<Question> mSource;
    RadioGroup.OnCheckedChangeListener listener;
    static class ViewHolder {
        TextView category = null;
        TextView question = null;
        RadioGroup rbGroup = null;

        ViewHolder(View row) {
            this.category = (TextView) row.findViewById(R.id.tvQuestionCategory);
            this.question = (TextView) row.findViewById(R.id.tvQuestion);
            this.rbGroup = (RadioGroup) row.findViewById(R.id.rgIteration);
        }
    }

    private LayoutInflater mInflater;

    public RadioAdapter(Context context, List<Question> mSource) {
        super(context, R.layout.item_question, mSource);
        mInflater = LayoutInflater.from(context);
        this.mSource = mSource;
    }

    public View getView(final int position, View convertView, ViewGroup parent) {
        ViewHolder holder = null;
        View row = convertView;

        if (row == null) {
            row = mInflater.inflate(R.layout.item_question, null);

            holder = new ViewHolder(row);
            listener = new RadioGroup.OnCheckedChangeListener() {

                public void onCheckedChanged(RadioGroup group, int checkedId) {

                    //Get position of current group
                    Integer pos = (Integer) group.getTag();
                    switch (checkedId) {
                        case R.id.rbIterationYes:
                            //Check 'YES' and uncheck 'NO'
                            mSource.get(pos).setYesChecked(true);
                            mSource.get(pos).setNoChecked(false);
                            break;

                        case R.id.rbIterationNo:
                            //Vice versa
                            mSource.get(pos).setNoChecked(true);
                            mSource.get(pos).setYesChecked(false);
                            break;
                    }
                }
            };
            holder.rbGroup.setOnCheckedChangeListener(listener);

            row.setTag(holder);
        } else {
            holder = (ViewHolder) row.getTag();
        }
        holder.rbGroup.setTag(new Integer(position));
        holder.category.setText(mSource.get(position).getCategory());
        holder.question.setText(mSource.get(position).getDescription());
        //If no one of buttons isn't checked
        holder.rbGroup.setOnCheckedChangeListener(null);
        if (!mSource.get(position).isYesChecked() && !mSource.get(position).isNoChecked()) {
            holder.rbGroup.clearCheck();
        }else {
            //We are supposing 'YES' is checked
            int c = 0;
            //Or 'NO' is checked
            if (mSource.get(position).isNoChecked()){
                c = 1;
            }
            //Set checked button

            ((RadioButton)holder.rbGroup.getChildAt(c)).setChecked(true);

        }
        holder.rbGroup.setOnCheckedChangeListener(listener);
        return row;
    }

}