rupal3112 :
I have created bottom navigation view with 5 items. On item multiple clicks, fragments are re-created and stored multiple times into the stack. I want to resume fragment if it is available in stack without poping other fragments.
MainActivity.java
private BottomNavigationView.OnNavigationItemSelectedListener mOnNavigationItemSelectedListener
= new BottomNavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
switch (item.getItemId()) {
case R.id.feed:
String feed_tag = getResources().getString(R.string.feed_tag);
if(!getSupportFragmentManager().popBackStackImmediate(feed_tag, 0)){
//fragment is not in backStack, create it
FeedFragment f1=new FeedFragment();
FragmentTransaction ft1 = getSupportFragmentManager().beginTransaction();
ft1.replace(R.id.fragment_container, f1, feed_tag).addToBackStack(feed_tag);
ft1.commit();
}
return true;
case R.id.search:
String search_tag = getResources().getString(R.string.search_tag);
if((!getSupportFragmentManager().popBackStackImmediate(search_tag, 0)) {
SearchFragment f3 = new SearchFragment();
FragmentTransaction ft3 = getSupportFragmentManager().beginTransaction();
ft3.replace(R.id.fragment_container, f3, search_tag).addToBackStack(search_tag);
ft3.commit();
}
return true;
case R.id.post:
String post_tag = getResources().getString(R.string.post_tag);
if(!getSupportFragmentManager().popBackStackImmediate(post_tag, 0);) {
Post postBase = new Post();
FragmentTransaction ft2 = getSupportFragmentManager().beginTransaction();
ft2.replace(R.id.fragment_container, postBase, post_tag).addToBackStack(post_tag);
ft2.commit();
}
return true;
case R.id.noti:
String noti_tag = getResources().getString(R.string.notification_tag);
if(!getSupportFragmentManager().popBackStackImmediate(noti_tag, 0)) {
NotificationFragment f4 = new NotificationFragment();
FragmentTransaction ft4 = getSupportFragmentManager().beginTransaction();
ft4.replace(R.id.fragment_container, f4, noti_tag).addToBackStack(noti_tag);
ft4.commit();
}
return true;
case R.id.profile:
String profile_tag = getResources().getString(R.string.profile_tag);
if(!getSupportFragmentManager().popBackStackImmediate(profile_tag, 0)) {
Fragment f5 = ProfileFragment.getInstance("val1", "val2");
FragmentTransaction ft5 = getSupportFragmentManager().beginTransaction();
ft5.replace(R.id.fragment_container, f5, profile_tag).addToBackStack(profile_tag);
ft5.commit();
}
return true;
}
return false;
}
};
If I use POP_BACK_STACK_INCLUSIVE flag, the fragment which I click get also removed and I got that fragment which is below the clicked fragment in backstack.
How can I get back already added fragment from backstack without recreating?
Kasım Özdemir :
You can do like this. Without recreating :
val firstFragment: Fragment = FirstFragment()
val secondFragment: Fragment = SecondFragment()
val thirdFragment: Fragment = ThirdFragment()
val navView: BottomNavigationView = findViewById(R.id.nav_view)
var active = firstFragment
fm.beginTransaction().add(R.id.nav_host_fragment, thirdFragment, "3").hide(thirdFragment).commit()
fm.beginTransaction().add(R.id.nav_host_fragment, secondFragment, "2").hide(secondFragment).commit()
fm.beginTransaction().add(R.id.nav_host_fragment, firstFragment, "1").commit()
navView.setOnNavigationItemReselectedListener { }
navView.setOnNavigationItemSelectedListener { item ->
when (item.itemId) {
R.id.navigation_first -> {
fm.beginTransaction().hide(active).show(firstFragment).commit()
active = firstFragment
}
R.id.navigation_second -> {
fm.beginTransaction().hide(active).show(secondFragment).commit()
active = secondFragment
}
R.id.navigation_third -> {
fm.beginTransaction().hide(active).show(thirdFragment).commit()
active = thirdFragment
}
}
true
}
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