Set default page for ViewPager in Android

Question

I am using the following code, MAX is 2 pages. By default the position is 0 and adds a new page to the right. I inflate two layout files.

How can I show the page1 wh

Answer 1

This solution gives the ability of setting default page without interference from outside of the Pager adapter class.

@Override
public Object instantiateItem(ViewGroup container, int position) {
    View currentPage = null;
    switch(position){
        case 0:
            currentPage = LayoutInflater.from(context).inflate(R.layout.page0, null)    
            break;
        case 1:
            currentPage = LayoutInflater.from(context).inflate(R.layout.page1, null)    
            ///////////// This page will be default ////////////////////
            ((ViewPager)container).setCurrentItem(position);
            ////////////////////////////////////////////////////////////
            break;
        case 2:
            currentPage = LayoutInflater.from(context).inflate(R.layout.page2, null)    
            break;
    return currentPage;
}

Answer 2

Have you tried using the setCurrentItem method?

Answer 3

The accepted solution is fine, but it's important to call this method after setting up the adapter.

    viewPager.setAdapter(adapterViewPager);
    viewPager.setCurrentItem(1);

Answer 4

You need to set page only during first initialisation of the fragment. Later it will restore a selected by user position from a "saved instance state". So this looks a little better:

override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    super.onViewCreated(view, savedInstanceState)

    pager.adapter = AwesomePagerAdapter()
    if (savedInstanceState == null) {
        pager.currentItem = 1
    }
}

Answer 5

By default, you have to set the current value 1 to show the just one default view. If you do not set setCurrentItem to 1, you can not see anything.

viewPager.setAdapter(adapterViewPager);
viewPager.setCurrentItem(1)