Question

我发现这段代码效果非常好，我必须使用RadioButton创建一些非常相似的东西。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的接受答案包括您重写自定义数组适配器以使用radiobuttons所需的所有代码。

修改

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编写自定义列表，查看持有者和对象。

Romain Guy详细解释了listview

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

和相关的pdf

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

一旦你handel customadapter viewholder等你只需要让你的列表实现可检查。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，您将使用单选按钮替换textview，并根据上面给出的链接实现可检查，它将起作用。

希望有所帮助

Android：带RadioButton的ArrayAdapter

1 个答案: