Pinned groups in ExpandableListView

Question

Is there a standard way to pin group item to the top of screen while scrolling group\'s items. I saw similar examples with ListView. What interfaces should I implement or wh

Answer 1

in Homo Incognito's answer, child view in pinned head view can't click and receive the click event, but i found a way. I put the code at: https://github.com/chenjishi/PinnedHeadListView

private final Rect mRect = new Rect();
private final int[] mLocation = new int[2];

@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
    if (mHeaderView == null) return super.dispatchTouchEvent(ev);

    if (mHeaderViewVisible) {
        final int x = (int) ev.getX();
        final int y = (int) ev.getY();
        mHeaderView.getLocationOnScreen(mLocation);
        mRect.left = mLocation[0];
        mRect.top = mLocation[1];
        mRect.right = mLocation[0] + mHeaderView.getWidth();
        mRect.bottom = mLocation[1] + mHeaderView.getHeight();

        if (mRect.contains(x, y)) {
            if (ev.getAction() == MotionEvent.ACTION_UP) {
                performViewClick(x, y);
            }
            return true;
        } else {
            return super.dispatchTouchEvent(ev);
        }
    } else {
        return super.dispatchTouchEvent(ev);
    }
}

private void performViewClick(int x, int y) {
    if (null == mHeaderView) return;

    final ViewGroup container = (ViewGroup) mHeaderView;
    for (int i = 0; i < container.getChildCount(); i++) {
        View view = container.getChildAt(i);

        /**
         * transform coordinate to find the child view we clicked
         * getGlobalVisibleRect used for android 2.x, getLocalVisibleRect
         * user for 3.x or above, maybe it's a bug
         */
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB) {
            view.getGlobalVisibleRect(mRect);
        } else {
            view.getLocalVisibleRect(mRect);
            int width = mRect.right - mRect.left;
            mRect.left = Math.abs(mRect.left);
            mRect.right = mRect.left + width;
        }

        if (mRect.contains(x, y)) {
            view.performClick();
            break;
        }
    }
}

this is the way i handle the click event in pinned view, override dispatchTouchEvent.