CODEWITHSUNDEEP
androidandroid-viewpager
Viherbar
Viherbar

Reputation: 249

Page position on a ViewPager when change from portrait to landscape

I have a problem when I change from portrait to landscape orientation when programing a gallery. The page position in the method PageAdapter.instantiateItem(View container, int position) turns 0 when change the screen orientation. I want to store the current page position to keep in this page when the orientation changes.

Upvotes: 1

Views: 1411

Answers (1)

Blacklight
Blacklight

Reputation: 3827

You will need to store the currently displayed page in your saved instance state. For how to save state, please read the documentation.

@Override
public void onSaveInstanceState(Bundle savedInstanceState) {
    // Save the current item
    savedInstanceState.putInt("current_item", pager.getCurrentItem());

    // Always call the superclass so it can save the view hierarchy state
    super.onSaveInstanceState(savedInstanceState);
}

After an orientation change, that state can be restored and used to set your pagers position.

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState); // Always call the superclass first

    // Check whether we're recreating a previously destroyed instance
    if (savedInstanceState != null) {
        // Restore value of members from saved state
        mCurrentItem = savedInstanceState.getInt("current_item");
    }
}

Call pager.setCurrentItem(mCurrentItem); e.g. in your onStart() or onResume() method.

For how to get and set the currently selected item read the ViewPager documentation:

getCurrentItem()

setCurrentItem()

Upvotes: 2

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