Android：带有 RadioButton 的 ArrayAdapter

Question

我发现这段代码效果很好，我必须创建一些非常相似但使用 RadioButton 的东西。我需要改变什么？

    public class InteractiveArrayAdapter extends ArrayAdapter<Model> {

    private final List<Model> list;
    private final Activity context;

    public InteractiveArrayAdapter(Activity context, List<Model> list) {
        super(context, R.layout.rowbuttonlayout, list);
        this.context = context;
        this.list = list;
    }

    static class ViewHolder {
        protected TextView text;
        protected CheckBox checkbox;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View view = null;
        if (convertView == null) {
            LayoutInflater inflator = context.getLayoutInflater();
            view = inflator.inflate(R.layout.rowbuttonlayout, null);
            final ViewHolder viewHolder = new ViewHolder();
            viewHolder.text = (TextView) view.findViewById(R.id.label);
            viewHolder.checkbox = (CheckBox) view.findViewById(R.id.check);
            viewHolder.checkbox
                    .setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {

                        @Override
                        public void onCheckedChanged(CompoundButton buttonView,
                                boolean isChecked) {
                            Model element = (Model) viewHolder.checkbox
                                    .getTag();
                            element.setSelected(buttonView.isChecked());

                        }
                    });
            view.setTag(viewHolder);
            viewHolder.checkbox.setTag(list.get(position));
        } else {
            view = convertView;
            ((ViewHolder) view.getTag()).checkbox.setTag(list.get(position));
        }
        ViewHolder holder = (ViewHolder) view.getTag();
        holder.text.setText(list.get(position).getName());
        holder.checkbox.setChecked(list.get(position).isSelected());
        return view;
    }
}



    public class Model {

    private String name;
    private boolean selected;

    public Model(String name) {
        this.name = name;
        selected = false;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public boolean isSelected() {
        return selected;
    }

    public void setSelected(boolean selected) {
        this.selected = selected;
    }

}

“rowbuttonlayout.xml”。

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

    <TextView
        android:id="@+id/label"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@+id/label"
        android:textSize="30px" >
    </TextView>

    <CheckBox
        android:id="@+id/check"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_marginLeft="4px"
        android:layout_marginRight="10px" >
    </CheckBox>

</RelativeLayout>

我在website 上找到了所有这些代码。

Answer 1

我想你会在这个已经回答的问题中找到所有必需的信息：

listview with radio group error

@Dante 接受的答案包括您重写自定义数组适配器以使用单选按钮所需的所有代码。

编辑

根据您的评论，我不确定您是否真的知道如何使用自定义适配器、视图持有者和对象编写自定义列表。

Romain Guy 在这里详细解释列表视图

http://www.google.com/events/io/2010/sessions/world-of-listview-android.html

以及相关的pdf

http://dl.google.com/googleio/2010/android-world-of-listview-android.pdf

一旦您处理 customadapter viewholder 等，您只需让您的列表实现可检查。例如这里

How to use RadioGroup in ListView custom adapter?

如果您不知道如何设置自定义列表视图，这里是一个示例，但它与您的问题没有直接关系：

// The Adapter
class myObjectAdapter extends ArrayAdapter<myObject> {
    myObjectAdapter() {
        super(MyActivity.this, R.layout.my_row_layout,
                listItems);
    }

    public View getView(int position, View convertView, ViewGroup parent) {
        myObjectHolder holder = null;
        if (convertView == null) {
            LayoutInflater inflater = getLayoutInflater();
            convertView = inflater.inflate(R.layout.my_row_layout,
                    parent, false);
            holder = new myObjectHolder(convertView);
            convertView.setTag(holder);
        } else {
            holder = (myObjectHolder) convertView.getTag();
        }
        holder.populateFrom(listItems.get(position));
        return (convertView);
    }
}

// The Holder
static class myObjectHolder {
    private TextView myText = null;        

    myObjectHolder(View row) {
        myText = (TextView) row.findViewById(R.id.MyTextView);            
    }

    void populateFrom(myObject r) {
        myText.setText(r.getText());            
    }
}

// The Object
class myObject {        
    public final String myText;        

    public myObject(String myText) {            
        this.myText = myText;            
    }

    public String getText() {
        return myText;
    }                
}

假设您有一个名为 my_row_layout 的 xml 文件，其中包含一个名为 MyTextView 的文本视图。在您的情况下，您将用单选按钮替换文本视图，并根据上面给出的链接实现可检查，它会起作用。

希望对你有帮助