ListPopupWindow not obeying WRAP_CONTENT width spec

Question

I\'m trying to use ListPopupWindow to show a list of strings via an ArrayAdapter (eventually this will be a more complex custom adapter). Code is below. As shown in

Answer 1

You could measure the width of the adapter content:

private int measureContentWidth(ListAdapter listAdapter) {
    ViewGroup mMeasureParent = null;
    int maxWidth = 0;
    View itemView = null;
    int itemType = 0;

    final ListAdapter adapter = listAdapter;
    final int widthMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
    final int heightMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
    final int count = adapter.getCount();
    for (int i = 0; i < count; i++) {
        final int positionType = adapter.getItemViewType(i);
        if (positionType != itemType) {
            itemType = positionType;
            itemView = null;
        }

        if (mMeasureParent == null) {
            mMeasureParent = new FrameLayout(mContext);
        }

        itemView = adapter.getView(i, itemView, mMeasureParent);
        itemView.measure(widthMeasureSpec, heightMeasureSpec);

        final int itemWidth = itemView.getMeasuredWidth();

        if (itemWidth > maxWidth) {
            maxWidth = itemWidth;
        }
    }

    return maxWidth;
}

and in your showPopup() function:

 ArrayAdapter arrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, STRINGS);
    popup.setAdapter(arrayAdapter);
    popup.setAnchorView(anchorView);
    popup.setContentWidth(measureContentWidth(arrayAdapter));

Answer 2

The following can help;

listPopupWindow.setWidth(400);
listPopupWindow.setHeight(ListPopupWindow.WRAP_CONTENT);

Answer 3

The problem is with the implementation of ListPopupWindow. I checked the source code, and using setContentWidth(ListPopupWindow.WRAP_CONTENT) or setWidth(ListPopupWindow.WRAP_CONTENT) makes the popup window use the width of its anchor view instead.