Question

我有一个listview（用布局充气）和一个扩展BaseAdapter的自定义适配器。 listview的每一行都包含radiobutton，textview和imageview。

我的问题是我无法将所有的radiobuttons添加到RadioGroup中。我想控制无线电按钮，以便任何时候都只能选择一个。

有人可以帮忙吗？

我的listview布局：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<ListView
    android:id="@+id/lv_activity_object_setup_final_objects"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" >
</ListView>

我的XML过去常常膨胀：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >

<RadioButton
    android:id="@+id/rbn_activity_object_setup_final_list_layout"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:layout_marginLeft="22dp"
    android:layout_marginTop="22dp"
    android:text="" android:button="@drawable/radio_button"/>

<ImageView
    android:id="@+id/img_activity_object_setup_final_list_layout_div_vertical"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="22dp"
    android:layout_marginTop="5dp"
    android:layout_toRightOf="@id/rbn_activity_object_setup_final_list_layout"
    android:src="@drawable/table_divider_vertical" />

<TextView
    android:id="@+id/txv_activity_object_setup_final_list_layout"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="16dp"
    android:layout_marginTop="22dp"
    android:layout_toRightOf="@id/img_activity_object_setup_final_list_layout_div_vertical"
    android:text="Object"
    android:textAppearance="?android:attr/textAppearanceMedium" />

<ImageView
    android:id="@+id/img_activity_object_setup_final_list_layout"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentRight="true"
    android:layout_marginRight="16dp"
    android:src="@drawable/object_icon_keys" />

我的自定义适配器代码：

    class ObjectAdapter extends BaseAdapter {
    Context context;
    List<ObjectType> objectTypeData;
    LayoutInflater inflater;

    public ObjectAdapter(Context context, List<ObjectType> objectTypeList) {
        this.context = context;
        inflater = LayoutInflater.from(context);
        this.objectTypeData = objectTypeList;
    }

    @Override
    public int getCount() {
        return objectTypeData.size();
    }

    @Override
    public Object getItem(int position) {
        return objectTypeData.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewGroup vg;

        if (convertView != null) {
            vg = (ViewGroup) convertView;
        } else {
            vg = (ViewGroup) inflater.inflate(R.layout.activity_object_setup_final_list_layout, null);
        }

        ObjectType objectType = objectTypeData.get(position);

        RadioButton radioButton = (RadioButton) vg.findViewById(R.id.rbn_activity_object_setup_final_list_layout);
        radioButton.setButtonDrawable(getResources().getDrawable(R.drawable.radio_button));
        if (objectType.getRadioButtonImage() == strDisabled) {
            radioButton.setEnabled(false);
            radioButton.setChecked(true);
        }
        else if (objectType.getRadioButtonImage() == strChecked) {
            radioButton.setEnabled(true);
            radioButton.setChecked(true);
        }
        else {
            radioButton.setEnabled(true);
            radioButton.setChecked(false);
        }

        TextView objectName = (TextView) vg.findViewById(R.id.txv_activity_object_setup_final_list_layout);
        objectName.setText(objectType.getTitle());

        ImageView objectImage = (ImageView) vg.findViewById(R.id.img_activity_object_setup_final_list_layout);
        if (objectType.getObjectTypeImage() == getString(R.string.strKeys)) {
            objectImage.setImageDrawable(getResources().getDrawable(R.drawable.object_icon_keys));
        }
        else if (objectType.getObjectTypeImage() == getString(R.string.strWallet)) {
            objectImage.setImageDrawable(getResources().getDrawable(R.drawable.object_icon_wallet));
        }
        else if (objectType.getObjectTypeImage() == getString(R.string.strBag)) {
            objectImage.setImageDrawable(getResources().getDrawable(R.drawable.object_icon_bag));
        }
        else if (objectType.getObjectTypeImage() == getString(R.string.strLaptop)) {
            objectImage.setImageDrawable(getResources().getDrawable(R.drawable.object_icon_laptop));
        }
        else {
            objectImage.setImageDrawable(getResources().getDrawable(R.drawable.object_icon_default));
        }

        return vg;
    }
}

Answer 1

将radiobuttons添加到OnClickListener。
在OnClick事件中，保存selectedItem索引。
调用适配器的notifyDataSetChanged方法。
在适配器中，检查selectedItem ==位置以决定是否应该检查无线电按钮。

radioButton.setChecked(selectionIndex==position);

将膨胀的listview布局中的RadioButtons添加到RadioGroup中

1 个答案: