底部导航用片段改变方向

Question

当我将方向纵向更改为横向时，我正在使用底部导航视图。并且当前的物品和碎片变成了一个，但他是两个或另一个。如何保存物品的位置？

Answer 1

你可以做类似的事情

    @Override
    public void onSaveInstanceState(Bundle savedInstanceState) {
        super.onSaveInstanceState(savedInstanceState);
        savedInstanceState.putInt("SelectedItemId", bottomNavigationView.getSelectedItemId());
    }

    @Override
    public void onRestoreInstanceState(Bundle savedInstanceState) {
        super.onRestoreInstanceState(savedInstanceState);
        int selectedItemId = savedInstanceState.getInt("SelectedItemId");
        bottomNavigationView.setSelectedItemId(selectedItemId);
    }