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Android Navigation Architecture Component - Get current visible fragment

Before trying the Navigation component I used to manually do fragment transactions and used the fragment tag in order to fetch the current fragment.

val fragment:MyFragment = supportFragmentManager.findFragmentByTag(tag):MyFragment

val fragment:MyFragment = supportFragmentManager.findFragmentByTag(tag):MyFragment

Now in my main activity layout I have something like:

<fragment
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/nav_host"
app:navGraph= "@navigation/nav_item"
android:name="androidx.navigation.fragment.NavHostFragment"
app:defaultNavHost= "true"
/>


How can I retrieve the current displayed fragment by the Navigation component?
Doing

supportFragmentManager.findFragmentById(R.id.nav_host)

supportFragmentManager.findFragmentById(R.id.nav_host)

returns a NavHostFragment and I want to retrieve my shown 'MyFragment`.

NavHostFragment

Thank you.

onActivityResult

4 Answers
4

I managed to discover a way for now and it is as follows:

NavHostFragment navHostFragment = supportFragmentManager.findFragmentById(R.id.nav_host);
navHostFragment.getChildFragmentManager().getFragments().get(0);


In case of course you know it is the first fragment. I am still investigating a way without this. I agree it is not the best way but that should be something for now.

can you please check with getChildFragmentManager() call with

getChildFragmentManager()

NavHostFragment fragment = supportFragmentManager.findFragmentById(R.id.nav_host);
MyFragment frag = (MyFragment) fragment.getChildFragmentManager().findFragmentByTag(tag);


There is no way I can find to retrieve the current fragment instance. However, you can get the ID of lastly added fragment using the code below.

navController.getCurrentDestination().getId()


It returns the ID in navigation file. Hope this helps.

In your activity define a fragment object. And from each fragment call this method by passing fragment object, like
So the static fragment object will be overridden by current showing fragment every time.

//method in MainActivity
private static Fragment fragment;

public void setFragment(Fragment fragment)
this.fragment = fragment;


//And from your fragment class, you can call
((<yourActivity in which fragment present>)getActivity()).setFragment(<your fragment object>);

//if you want to set it directly;
((<yourActivity in which fragment present>)getActivity()).fragment=<your fragment object>;


You can also set callback from fragment to activity, for a better approach and pass your current fragment object.

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