如何在ListView自定义适配器中使用RadioGroup？

Question

我想在列表中显示一个选择选项.我正在使用RadioButton我的listView排.我知道这RadioGroup用于单一选择.

但问题是我已经添加了RadioButton我的ListRowView.现在我想将所有列表项添加到一个中RadioButton.我正在使用Custom Adapter和进入getView().我得到RadioButton的getView(),但要添加它时RadioGroup它说

"视图已经有父级,在父级之前调用removeView()"

我知道它是真的,但如果我从视图中删除它.然后它是不可见的.

我还尝试以RadioButton编程方式创建和添加.然后添加它RadioGrop.然后查看列表行.但这次作为父母RadioGroup,所以它再说

"视图已经有父级,在父级之前调用removeView()"

我想要做的是一次只选择列表中的一个项目.我的代码如下.

getView

 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XML行

<?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>

Answer 1

你需要做两件事:

1. 使用 mListView.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
2. 制作自定义行视图工具Checkable.(关于这方面更多的信息在这里).

Answer 2

这个解决方案很有效,而且很干净,但可能会有一些更好的解决方案.

您应该使用适配器来管理单选按钮状态.

您必须保留对最后检查的单选按钮的引用,然后RadioButton.onClick设置最后选中的单选按钮setChecked(false).

还记得将新选择的单选按钮设置为最后选择的单选按钮.

看例子:

private class MyAdapter extends ArrayAdapter<String>{

    private int mResourceId = 0;
    private LayoutInflater mLayoutInflater; 
    private RadioButton mSelectedRB;
    private int mSelectedPosition = -1;

    public MyAdapter(Context context, int resource, int textViewResourceId, List<String> objects) {
        super(context, resource, textViewResourceId, objects);
        mResourceId = resource;
        mLayoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }


    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        View view = convertView;
        ViewHolder holder;

        if(view == null){

            view = mLayoutInflater.inflate(mResourceId, parent, false);
            holder = new ViewHolder();

            holder.name = (TextView)view.findViewById(R.id.text);
            holder.radioBtn = (RadioButton)view.findViewById(R.id.radioButton1);

            view.setTag(holder);
        }else{
            holder = (ViewHolder)view.getTag();
        }


        holder.radioBtn.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {

                if(position != mSelectedPosition && mSelectedRB != null){
                    mSelectedRB.setChecked(false);
                }

                mSelectedPosition = position;
                mSelectedRB = (RadioButton)v;
            }
        });


        if(mSelectedPosition != position){
            holder.radioBtn.setChecked(false);
        }else{
            holder.radioBtn.setChecked(true);
            if(mSelectedRB != null && holder.radioBtn != mSelectedRB){
                mSelectedRB = holder.radioBtn;
            }
        }




        holder.name.setText(getItem(position));


        return view;
    }

    private class ViewHolder{
        TextView        name;
        RadioButton     radioBtn;
    }
}

希望它能为你做到.

Answer 3

这是我的解决方案.它非常简单.

my_radio_adapter_item.xml:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal">

    <TextView 
        android:id="@+id/name"
        android:layout_width="0dp" 
        android:layout_height="wrap_content"
        android:layout_weight="1"
        ... />

    <RadioButton
        android:id="@+id/radio"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:clickable="false"
        android:focusable="false"
        ... />

</LinearLayout>

MyRadioAdapter.java

public class MyRadioAdapter extends BaseAdapter
{
    private Context mContext;
    private ArrayList<Variation> mVariations;
    private int mSelectedVariation;


    public MyRadioAdapter(Context context, ArrayList<Variation> variations, int selectedVariation)
    {
        mContext = context;
        mVariations = variations;
        mSelectedVariation = selectedVariation;
    }


    @Override
    public View getView(final int position, View convertView, ViewGroup parent)
    {
        View view = convertView;
        if(view==null) 
        {
            LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            view = inflater.inflate(R.layout.my_radio_adapter_item, null);          
        }

        final Variation variation = mVariations.get(position);

        TextView name = (TextView) view.findViewById(R.id.name);
        RadioButton radio = (RadioButton) view.findViewById(R.id.radio);

        name.setText(variation.getName());
        if(position==mSelectedVariation) radio.setChecked(true);
        else radio.setChecked(false);

        view.setOnClickListener(new OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                mSelectedVariation = position;
                MyRadioAdapter.this.notifyDataSetChanged();
            }
        });

        return view;
    }

    ...
}