Weird Android behaviour

**ObiWanKenobe** · 28th May 2015, 09:57

Hi everyone,

I have the following code:

Qt Code:

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void DAppNavigation::showEvent(QShowEvent *event)
{
    if (m_currentPage < 0)
    {
        setCurrentPage(0);
    }
}
â€¦
bool DAppNavigation::setCurrentPage(int aPageIndex)
{
        ...
        // Setup animation
        ...
        QTimer::singleShot(50, this, SLOT(startAnimation ())); // Works well on Win and Android
        //seqGroup->start();                                   // Doesnâ€™t work on Android
 
        if (m_previousPage != m_currentPage)
            emit pageChanged(m_previousPage, m_currentPage);
        return true;
}
 
void DAppNavigation:: startAnimation ()
{
    seqGroup->start();
}

void DAppNavigation::showEvent(QShowEvent *event)
{
    if (m_currentPage < 0)
    {
        setCurrentPage(0);
    }
}
â€¦
bool DAppNavigation::setCurrentPage(int aPageIndex)
{
        ...
        // Setup animation
        ...
        QTimer::singleShot(50, this, SLOT(startAnimation ())); // Works well on Win and Android
        //seqGroup->start();                                   // Doesnâ€™t work on Android

        if (m_previousPage != m_currentPage)
            emit pageChanged(m_previousPage, m_currentPage);
        return true;
}

void DAppNavigation:: startAnimation ()
{
    seqGroup->start();
}

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I have several buttons that I animate (QPropertyAnimation in a QSequentialAnimationGroup).
When I call the animation directly (seqGroup->start()), the first button stays hidden for the first time, because it's not animated on Android.
After that it works fine.
When I start the animation with QTimer::singleShot() it worrk fine on Android and Windows.

What's the matter? Can anybody explain this?