My app uses 2 identical ViewPagers that contain 6 images in each of their 6 Fragments.
The leftViewPager's OnPageChangeListener swipe is used to control the rightViewPager.
As I swipe through the 6 leftViewpager fragments the rightViewpager just rotate between the first 2 Fragments back and forth!
I understand this is due to Android loading the current and next Fragment in the viewPager, but when I swipe the rightViewpager manually (Just to check) all 6 Fragments are there!!
So the Question: How can I get all 6 Fragments in Vp2 by swiping Vp1?? As the Hierachy Viewer shows just 2 Fragments. Or Do I need some special trickery to re-use/recycle the two fragments?
Click link to animated gif illustrating issue
// Set View pager on page changed listner first_pager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() { @Override public void onPageSelected(int position) { //second_pager.setCurrentItem(position); //Jerky Toast.makeText(MainActivity.this, "Selected page position: " + position, Toast.LENGTH_SHORT).show(); } @Override public void onPageScrolled(int position , float positionOffset , int positionOffsetPixels) { if(positionOffsetPixels>0) { second_pager.scrollTo(positionOffsetPixels-second_width ,0); // 2/3 vers //second_pager.scrollTo(positionOffsetPixels-second_width + positionOffsetPixels ,0); } } @Override public void onPageScrollStateChanged(int position) { } });
MyAdapter uses
public class SecondPageAdapter extends FragmentPagerAdapter {
public SecondPageAdapter(FragmentManager fm) {
super(fm);
// TODO Auto-generated constructor stub
}
@Override
public int getCount() {
// Return how many Fragment's attached on View Pager
return 6;
}
@Override
public Fragment getItem(int position) {
Log.i("First", "postion="+position);
switch (position) {
case 0: // Fragment # 0 - This will show FirstFragment
return Fragment1.init(position);
case 1: // Fragment # 1 - This will show SecondFragment
return Fragment2.init(position);
case 2: // Fragment # 0 - This will show FirstFragment
return Fragment3.init(position);
case 3: // Fragment # 1 - This will show SecondFragment
return Fragment4.init(position);
case 4: // Fragment # 0 - This will show FirstFragment
return Fragment5.init(position);
case 5: // Fragment # 1 - This will show SecondFragment
return Fragment6.init(position);
default:// Fragment # default - Will show FirstFragment
return null;
}
}
public int getItemPosition(Object object) {
return POSITION_NONE;
}
@Override
public Parcelable saveState() {
// TODO Auto-generated method stub
return super.saveState();
}
@Override
public void notifyDataSetChanged() {
// TODO Auto-generated method stub
super.notifyDataSetChanged();
Log.d("DataSetChanged", "notifyDataSetChanged=");
}
}
