I am playing with fragments in Android.
I know I can change a fragment by using the following code:
FragmentManager fragMgr = getSupportFragmentManag
You can query which fragment is loaded into your Activities content frame, and retrieve the fragment class, or fragment 'simple name' (as a string).
public String getCurrentFragment(){
return activity.getSupportFragmentManager().findFragmentById(R.id.content_frame).getClass().getSimpleName();
}
Usage:
Log.d(TAG, getCurrentFragment());
Outputs:
D/MainActivity: FragOne
Sev's answer works for when you hit the back button or otherwise change the backstack.
I did something slightly different, though. I have a backstack change listener setup on a base Fragment and its derived fragments and this code is in the listener:
Fragment f = getActivity().getSupportFragmentManager().findFragmentById(R.id.container);
if (f.getClass().equals(getClass())) {
// On back button, or popBackStack(),
// the fragment that's becoming visible executes here,
// but not the one being popped, or others on the back stack
// So, for my case, I can change action bar bg color per fragment
}
In case of scrolled fragments, when your use instance of ViewPager class, suppose mVeiwPager, you can call mViewPager.getCurrentItem() for get current fragment int number.
in MainLayout.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
android:orientation="vertical"
tools:context="unidesign.photo360.MainActivity">
<android.support.design.widget.AppBarLayout
android:id="@+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fitsSystemWindows="false"
android:theme="@style/AppTheme.AppBarOverlay"
app:expanded="false">
<android.support.v7.widget.Toolbar
android:id="@+id/main_activity_toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
app:popupTheme="@style/AppTheme.PopupOverlay"
app:title="@string/app_name">
</android.support.v7.widget.Toolbar>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="@+id/view_pager"
android:layout_width="match_parent"
android:layout_height="wrap_content">
</android.support.v4.view.ViewPager>
</android.support.design.widget.CoordinatorLayout>
in MainActivity.kt
class MainActivity : AppCompatActivity() {
lateinit var mViewPager: ViewPager
lateinit var pageAdapter: PageAdapter
// ...
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
pageAdapter = PageAdapter(supportFragmentManager)
mViewPager = findViewById(R.id.view_pager)
// ...
}
override fun onResume() {
super.onResume()
var currentFragment = pageAdapter.getItem(mViewPager.currentItem)
// ...
}
My method is based on try / catch like this :
MyFragment viewer = null;
if(getFragmentManager().findFragmentByTag(MY_TAG_FRAGMENT) instanceOf MyFragment){
viewer = (MyFragment) getFragmentManager().findFragmentByTag(MY_TAG_FRAGMENT);
}
But there may be a better way ...
If you are using the AndroidX Navigation
:
val currentFragment = findNavController(R.id.your_navhost).?currentDestination
For more info on this navigation component: https://developer.android.com/guide/navigation/navigation-getting-started
1)
ft.replace(R.id.content_frame, fragment, **tag**).commit();
2)
FragmentManager fragmentManager = getSupportFragmentManager();
Fragment currentFragment = fragmentManager.findFragmentById(R.id.content_frame);
3)
if (currentFragment.getTag().equals(**"Fragment_Main"**))
{
//Do something
}
else
if (currentFragment.getTag().equals(**"Fragment_DM"**))
{
//Do something
}