getChildView not being called

Question

I am making a menu which includes a custom ExpandableListView adapter. Despite trying to match my code as close to the API examples and any other examples I\'ve seen online

Answer 1

The Problem is, your ExpandableListView is in a ScrollView. This is most of the times the result of bad layouts, and you should try to avoid it.

However sometimes it is the only solution (that's actually not true but other solutions might be out of ones scope). Your solution also works but is a bit complex. Instead write a custom ExpandableListView like this:

public class ExpandExpandableListView extends ExpandableListView{
    boolean expanded = true;

    public ExpandExpandableListView(Context context) {
        super(context);
    }

    public ExpandExpandableListView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public ExpandExpandableListView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    public boolean isExpanded()
    {
        return expanded;
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        if (isExpanded())
        {
            // Calculate entire height by providing a very large height hint.
            // View.MEASURED_SIZE_MASK represents the largest height possible.
            int expandSpec = MeasureSpec.makeMeasureSpec(MEASURED_SIZE_MASK, MeasureSpec.AT_MOST);
            super.onMeasure(widthMeasureSpec, expandSpec);

            ViewGroup.LayoutParams params = getLayoutParams();
            params.height = getMeasuredHeight();
        }else{
            super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        }
    }

    public void setExpanded(boolean expanded)
    {
        this.expanded = expanded;
    }
}

and in your m_backdrop.xml:

That's already it. It should work as expected.