如何在 ListView 自定义适配器中使用 RadioGroup? [英] How to use RadioGroup in ListView custom adapter?

问题描述

我想在我的列表中显示一个选择选项.我在 listView 行中使用了 RadioButton.我知道 RadioGroup 用于单选.

I want to show a single select option in my list. I am using RadioButton in my listView row. I know that RadioGroup is used for single selection.

但问题是我在 ListRowView 中添加了 RadioButton.现在我想将所有列表项添加到一个 RadioButton 中.我正在使用 Custom Adapter 和 getView().我在 getView() 中得到了 RadioButton，但是当想在 RadioGroup 中添加它时，它说

But problem is that I have added the RadioButton in my ListRowView. Now I want to add all my list items in one RadioButton. I am using Custom Adapter and in getView(). I get the RadioButton in getView(), but when want to add it in RadioGroup it say

视图已经有父视图，之前在父视图中调用 removeView()"

"view already have parent , call removeView() in parent before"

而且我知道它是真的，但是如果我从视图中删除它.然后它是不可见的.

And I know its true, but if I remove it from the view. Then it is not visible.

我还尝试以编程方式创建和添加 RadioButton.然后将其添加到 RadioGrop 中.然后查看列表行.但是这次因为父对象是RadioGroup，所以又说

I also try to create and add RadioButton programmatically. And then add it in RadioGrop. And then to view of list row. But this time as the parent is RadioGroup, so again it say

视图已经有父视图，之前在父视图中调用 removeView()"

"view already have parent , call removeView() in parent before"

我想要做的是一次只选择列表中的一项.我的代码如下.

What I want to do is to select only one item in list at a time. My code is as follows.

 public class MyAdapter extends ArrayAdapter < MyMenuItem > {
    
    private LayoutInflater mInflater ;
    
    int                    mResource ;
    List < MyMenuItem >    mData ;
    Context context;
    
    public MyAdapter ( Context context , int resource , int textViewResourceId , List < MyMenuItem > data ) {
        super ( context , resource , textViewResourceId , data ) ;
        this.context = context;
        mData = data ;
        mResource = resource ;
        mInflater = ( LayoutInflater ) getSystemService ( Context.LAYOUT_INFLATER_SERVICE ) ;
    }
    
    @ Override
    public View getView ( int position , View convertView , ViewGroup parent ) {
        ViewHolder holder = null ;
        if ( convertView == null ) {
            convertView = mInflater.inflate ( mResource , null ) ;
            holder = new ViewHolder ( ) ;
            holder.icon = ( ImageView ) convertView.findViewById ( R.id.icon ) ;
            holder.text = ( TextView ) convertView.findViewById ( R.id.text ) ;
            holder.comment = ( TextView ) convertView.findViewById ( R.id.comment ) ;
            LinearLayout lin = ( LinearLayout ) convertView.findViewById ( R.id.linerList ) ;
            RadioButton rbtn = new RadioButton ( context );
            LayoutParams lparam = new LayoutParams ( LayoutParams.WRAP_CONTENT , LayoutParams.WRAP_CONTENT );
            rbtn.setSelected ( false );
            holder.check = rbtn;
            //radioGroup.addView ( rbtn );
            lin.addView ( rbtn , 0 );
            
            convertView.setTag ( holder ) ;
        } else {
            holder = ( ViewHolder ) convertView.getTag ( ) ;
        }
        
        holder.text.setText ( mData.get ( position ).getText ( ) ) ;
        holder.comment.setText ( mData.get ( position ).getComment ( ) ) ;
        
        holder.icon.setImageResource ( getApplicationContext ( ).getResources ( ).getIdentifier ( mData.get ( position ).getIcon ( ) ,
                "drawable" , getPackageName ( ) )

        ) ;
        
        return convertView ;
    }
    
}

我的行的 XML

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="?android:attr/listPreferredItemHeight"
android:padding="6dip">
<LinearLayout
    android:id = "@+id/linerList"
    android:orientation="horizontal"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">
    <ImageView
        android:id="@+id/icon"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginRight="6dip" />
</LinearLayout>
<LinearLayout
    android:orientation="vertical"
    android:layout_width="wrap_content"
    android:layout_weight="1"
    android:layout_height="fill_parent">
    <TextView
        android:id="@+id/text"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:gravity="center_vertical"
        android:text="My Application"
        android:textSize="20sp"
        android:singleLine="true"
        android:ellipsize="marquee"
        android:textColor="@color/white" />
    <TextView
        android:id="@+id/comment"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:singleLine="true"
        android:ellipsize="marquee"
        android:text="Simple application that shows how to use RelativeLayout"
        android:textSize="14sp"
        android:textColor="@color/light_gray" />
</LinearLayout>

推荐答案

你需要做两件事:

1. 使用mListView.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
2. 使您的自定义行视图实现 Checkable.(有关此的更多信息此处).

1. Use mListView.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
2. Make your custom row view implement Checkable. (More info about this here).

这篇关于如何在 ListView 自定义适配器中使用 RadioGroup?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！