Question

我们正在开发一个项目，其中有一个自定义列表视图，每个列表项中都有一个无线电组。其中的单选按钮是动态生成的。问题是滚动时所选单选按钮的状态将被取消选择。以下是我们尝试过的代码：

适配器getView（）方法：

<?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:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:id="@+id/single_question_name"
      />
    <RadioGroup
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/single_radiogroup"
        android:orientation="vertical"
       >

    </RadioGroup>


</LinearLayout>

编辑：这是single_choice_layout.xml文件：

{{1}}

Answer 1

如果我正确理解您的代码。您还需要实现此方法。

check（int id）将选择设置为标识符在参数中传递的单选按钮。

Answer 2

试试这段代码

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

    //give the corrct class name
    QuestionObj rowObject = question_list_array.get(position);

    option_list = question_list_array.get(position).option_list;
    number_of_options = option_list.size();

    v_single = convertView;
    SingleHolder sh;
    if (v_single == null) {
        v_single = inflater.inflate(R.layout.single_choice_layout, null);
        sh = new SingleHolder();
        sh.single_question_name = (TextView) v_single.findViewById(R.id.single_question_name);
        sh.single_radiogroup = (RadioGroup) v_single.findViewById(R.id.single_radiogroup);
        v_single.setTag(sh);
    } else {
        sh = (SingleHolder) v_single.getTag();
    }

    sh.single_question_name.setText(rowObject.getQuestion_name());
    sh.single_radiogroup.clearCheck();
    sh.single_radiogroup.removeAllViews();

    for (int j = 0; j < number_of_options; j++) {
        RadioButton rb = new RadioButton(context);
        rb.setId(Integer.parseInt(option_list.get(j).getOption_id()));
        rb.setText(option_list.get(j).getOption_name());
        sh.single_radiogroup.addView(rb);
    }

    if (rowObject.getSelectedId() != 0) {

        RadioButton radioButton = (RadioButton) sh.single_radiogroup.findViewById(rowObject.getSelectedId());
        if (radioButton != null)
            radioButton.setChecked(true);
    }
    sh.single_radiogroup.setTag(rowObject);
    sh.single_radiogroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(RadioGroup group, int checkedId) {

            QuestionObj rowObject = (QuestionObj) group.getTag();
            rowObject.setSelectedId(checkedId);
            RadioButton radioButton = (RadioButton) group.findViewById(checkedId);
            rowObject.setAnswer(radioButton.getText());


        }
    });
    v_final = v_single;

    return v_final;
}

private class SingleHolder {
    TextView single_question_name;
    RadioGroup single_radiogroup;
}

class QuestionObj {
    private int selectedId;

    public int getSelectedId() {
        return selectedId;
    }

    public void setSelectedId(int selectedId) {
        this.selectedId = selectedId;
    }
    //put this is in those
    //other fieldds like questionname, question id,
}

状态动态单选按钮在listview Android中滚动更改

2 个答案: