findFragmentById always returns null

R.id.test_fragment is not the ID of your fragment but the id of your LinearLayout

Calling add(int containerViewId, Fragment fragment) will add a fragment without a tag.
So or you use add(int containerViewId, Fragment fragment, String tag) and you get back your fragment using your tag (as an ID)

Related Contents:

  1. Send data from activity to fragment in Android
  2. Best practice for instantiating a new Android Fragment
  3. How to correctly save instance state of Fragments in back stack?
  4. Update ViewPager dynamically?
  5. How to handle button clicks using the XML onClick within Fragments
  6. Communicating between a fragment and an activity – best practices
  7. How to put Google Maps V2 on a Fragment using ViewPager
  8. getActivity() returns null in Fragment function
  9. Do fragments really need an empty constructor?
  10. How to implement OnFragmentInteractionListener
  11. How to pass data between fragments
  12. Getting the current Fragment instance in the viewpager
  13. Fragments within Fragments
  14. Error inflating class fragment
  15. How to resume existing Fragment from BackStack
  16. Getting the error “Java.lang.IllegalStateException Activity has been destroyed” when using tabs with ViewPager
  17. Calling a Fragment method from a parent Activity
  18. Activity, AppCompatActivity, FragmentActivity, and ActionBarActivity: When to Use Which?
  19. MapView in a Fragment (Honeycomb)
  20. How to get existing fragments when using FragmentPagerAdapter
  21. How to implement RecyclerView with CardView rows in a Fragment with TabLayout
  22. Why use Fragment#setRetainInstance(boolean)?
  23. How to clear navigation Stack after navigating to another fragment in Android
  24. getView returning null when fragment has been created from an activity
  25. Get the current fragment object
  26. Fragment is not being replaced but put on top of the previous one
  27. Show DialogFragment with animation growing from a point
  28. How to use setArguments() and getArguments() methods in Fragments?
  29. Best practice for nested fragments in Android 4.0, 4.1 (
  30. How do you create Preference Activity and Preference Fragment on Android?
  31. Android – save/restore fragment state
  32. Adding button action in custom notification
  33. Difference between Activity and FragmentActivity
  34. How to pass Bundle from Fragment to Fragment
  35. Alternatives to PreferenceFragment with android-support-v4
  36. Android ViewPager get the current View
  37. Sending data from nested fragments to parent fragment
  38. How to listen for preference changes within a PreferenceFragment?
  39. Cannot call getSupportFragmentManager() from activity
  40. When a Fragment is replaced and put in the back stack (or removed) does it stay in memory?
  41. Position of DialogFragment in Android
  42. application content goes behind the navigation bar in android L
  43. Why use Fragments? [duplicate]
  44. findFragmentByTag() returns null after perform a FragmentTransaction using replace() method
  45. Error inflating class android.support.design.widget.CoordinatorLayout and ClassNotFoundException: android.support.design.R$styleable
  46. How to replace a Fragment on button click of that fragment?
  47. Android ViewPager padding/margin between page fragments
  48. How to replace the activity’s fragment from the fragment itself?
  49. When to use FragmentManager::putFragment and getFragment
  50. Data Sharing between Fragments and Activity in Android

Leave a Comment