public void setContentEmpty(boolean isEmpty) {
        ensureContent();
        if (mContentView == null) {
            throw new IllegalStateException("Content view must be initialized before");
        }
        if (isEmpty) {
            mEmptyView.setVisibility(View.VISIBLE);
            mContentView.setVisibility(View.GONE);
        } else {
            mEmptyView.setVisibility(View.GONE);
            mContentView.setVisibility(View.VISIBLE);
        }
        mIsContentEmpty = isEmpty;
    }
If the content is empty, then set true otherwise false. The default content is not empty.
You can't call this method if the content view has not been initialized before
{@link #setContentView(android.view.View)} and content view not null.

@param isEmpty true if content is empty else false
@see #isContentEmpty()
sherlockprogressfragment/src/com/devspark/progressfragment/SherlockProgressFragment.java