Question

I want to add a custom view to a group view with a BaseExpandableListAdapter

This is The code:

The custom view and layout.xml

public class InfoView extends View{
    private EditText nameEditText;
    private EditText descriptionEditText;
    private Spinner goalTypeSpinner;
    private Spinner categorySpinner;



    Button addGoalCategoryButton;
    public InfoView(Context context) {
        super(context);
        inflate(context, R.layout.info_panel, parent);
        nameEditText = (EditText) findViewById(R.id.nameEditText);

        descriptionEditText = (EditText) findViewById(R.id.descriptionEditText);

        goalTypeSpinner = (Spinner) 
                findViewById(R.id.goalTypeSpinner);

        categorySpinner = (Spinner) 
                findViewById(R.id.categorySpinner);
    }
}

infopanel.xml

<LinearLayout 
    android:layout_width="wrap_content" android:layout_height="wrap_content"
    xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" >
    <Spinner android:id="@+id/goalTypeSpinner" android:prompt="@string/goalType"
            android:entries="@array/goalTypeList" style="@style/commonText.commonSpinner" >
    </Spinner>
    <TableRow style="@style/commonText.commonTableRow">

            <Spinner android:id="@+id/categorySpinner" style="@style/commonText.commonSpinner.right"
                android:prompt="@string/goalType">
            </Spinner>
            <Button android:id="@+id/newCategoryButton" style="@style/commonText.commonButton"
                android:text="add category" />
    </TableRow> 
    <EditText android:id="@+id/nameEditText" android:hint="@string/nameEditTextHint"
        style="@style/commonText.commonEditText" >
    </EditText>
    <EditText android:id="@+id/descriptionEditText" android:hint="@string/descriptionEditTextHint"
        style="@style/commonText.commonTextArea">
    </EditText>

</LinearLayout>

In the BaseExpandableListAdapter :

..............
InfoView infoView;
public View getChildView(int groupPosition, int childPosition,
            boolean isLastChild, View convertView, ViewGroup parent) {

        if (group.equals(INFO) && child.equals(INFO)) {
            Log.i(TAG, "group INFO(" + group + ")");

            if (infoView == null) {

                // i don't want to recreate everytime 
                // the view so i check if is null         

                infoView = new InfoView(context);
            }

            return infoView;
        }
........

The code works (ie doesn’t throw any exception) but the view isn’t displayed.

Do you know Why ?

thanks and regards

Answer 1

The proper way to implement getChildView is to use the provided convertView. Don’t keep reference of any Views created in getChildView.

public View getChildView(int groupPosition, int childPosition,
                        boolean isLastChild, View convertView, ViewGroup parent) {
    if (convertView == null) {
        convertView = new InfoView(context);
    }
    return convertView;
}