Question

I have a gallery where I have implement a custom adapter extending the BaseAdapter. For some items, I want them to be disabled, and not clickable as well.

Overriding the isEnabled(int) method doesn’t work. I am still able to click on the disabled items, and then, the gallery centers this item inside it.

Any ideas?

Answer 1

This following is the relevant source code of gallery widget

  public boolean onSingleTapUp(MotionEvent e) {

     if (mDownTouchPosition >= 0) {

         // An item tap should make it selected, so scroll to this child.
         scrollToChild(mDownTouchPosition - mFirstPosition);

         // Also pass the click so the client knows, if it wants to.
         if (mShouldCallbackOnUnselectedItemClick || mDownTouchPosition == mSelectedPosition) {
             performItemClick(mDownTouchView, mDownTouchPosition, mAdapter
                     .getItemId(mDownTouchPosition));
         }

         return true;
     }

     return false;
 }

As you can see, the gallery scrolls to the tapped child item before performing the click on it.
So the only way you can truly disable an item is by extending Gallery and overriding onSingleTapUp(MotionEvent e) in it.

@Override
public boolean onSingleTapUp(MotionEvent e) {
    int itemPosition = pointToPosition((int) e.getX(), (int) e.getY());
    if (item at itemPosition is disabled) {
        // Do nothing.
        return true;
    }
    return super.onSingleTapUp(e);
}

Try and let me know.