findViewById() returns null when I call it in onCreate()

by

Activity findViewById() searches the activity’s view hierarchy set with setContentView() for the given view id. The view you appear to be looking for is in a fragment and not in the activity hierarchy (yet). Fragment transactions are not immediate either so even if you add it to the container in the activity hierarchy, it is not attached there right away but only when the transaction is processed.

In theory it’s possible to synchronously execute pending fragment transactions with executePendingTransactions(). However, it’s better to just move the code that touches a fragment’s views in its onCreateView(). Fragments and their hosting activities are supposed to be relatively independent of each other, so an activity accessing a fragment’s internals should be avoided.

More Related Contents:

  1. This app won’t run unless you update Google Play Services (via Bazaar)
  2. Google Sign In error 12500
  3. Dilemma: when to use Fragments vs Activities:
  4. How to display Toast in Android?
  5. Android Fragment onAttach() deprecated
  6. Deprecated Gradle features were used in this build, making it incompatible with Gradle 5.0
  7. How to make a launcher
  8. pathPattern to match file extension does not work if a period exists elsewhere in the file name?
  9. How to send file using bluetooth on android programatically?
  10. Disable LogCat Output COMPLETELY in release Android app?
  11. ActionBarSherlock – How to set the padding of each actionbar’s icon?
  12. How can a divider line be added in an Android RecyclerView?
  13. Alternatives to PreferenceFragment with android-support-v4
  14. Uncaught exception in Firebase runloop (3.0.0)
  15. How do I get MediaProjectionManager without disturbing the current foreground process, except to ask for permission?
  16. how to play video from url
  17. Want to compile native Android binary I can run in terminal on the phone
  18. setting audio file as Ringtone
  19. Android: custom separator (or even item) in ListView depening on content of item
  20. How to change textcolor in AlertDialog
  21. Firebase onTokenRefresh() is not called
  22. Redirecting audio / creating alternate sound paths in Android
  23. How to change the text of a CheckBox in listview?
  24. App completely restarting when launched by icon press in launcher
  25. How to set Spinner default value to null?
  26. Not seeing Nexus7 in Eclipse’s Android Devices [duplicate]
  27. Creating an android smart app banner
  28. How Do I Create A Certificate For My Android Market APK?
  29. Crop square image to circle – Programmatically
  30. Using custom simpleCursorAdapter

Leave a Comment