Created
August 20, 2019 21:15
-
-
Save enriquebautista/b2d6f153bfe565db22562c4e74dc01f7 to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
/* | |
Extension of FragmentStatePagerAdapter which intelligently caches | |
all active fragments and manages the fragment lifecycles. | |
Usage involves extending from SmartFragmentStatePagerAdapter as you would any other PagerAdapter. | |
*/ | |
public abstract class SmartFragmentStatePagerAdapter extends FragmentStatePagerAdapter { | |
// Sparse array to keep track of registered fragments in memory | |
private SparseArray<Fragment> registeredFragments = new SparseArray<Fragment>(); | |
public SmartFragmentStatePagerAdapter(FragmentManager fragmentManager) { | |
super(fragmentManager); | |
} | |
// Register the fragment when the item is instantiated | |
@Override | |
public Object instantiateItem(ViewGroup container, int position) { | |
Fragment fragment = (Fragment) super.instantiateItem(container, position); | |
registeredFragments.put(position, fragment); | |
return fragment; | |
} | |
// Unregister when the item is inactive | |
@Override | |
public void destroyItem(ViewGroup container, int position, Object object) { | |
registeredFragments.remove(position); | |
super.destroyItem(container, position, object); | |
} | |
// Returns the fragment for the position (if instantiated) | |
public Fragment getRegisteredFragment(int position) { | |
return registeredFragments.get(position); | |
} | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment