Advertisement
Guest User

Untitled

a guest
Apr 23rd, 2020
18
0
Never
Not a member of Pastebin yet? Sign Up, it unlocks many cool features!
Java 1.56 KB | None | 0 0
  1. Activity
  2.  
  3. private OnServiceStateChangedListener stateChangedListener;
  4. ...
  5. if (stateChangedListener != null) { <- Тут null
  6.         Log.d(TAG, "State changed");
  7.         stateChangedListener.onStateChanged(serviceState);
  8.     } else {
  9.         Log.w(TAG, "StateChangedListener is null");
  10. }
  11. ...
  12.  
  13. public void setOnStateChangedListener(OnServiceStateChangedListener listener) {
  14.         if (listener == null) Log.w(TAG, "listener is null"); <- Тут не null
  15.         Log.d(TAG, "StateChangedListener is set");
  16.         stateChangedListener = listener;
  17.     }
  18.  
  19.  
  20. public void removeStateChangedListener() { stateChangedListener = null; }
  21.  
  22.  
  23. public interface OnServiceStateChangedListener {
  24.     void onStateChanged(State state);
  25. }
  26. --------------------------------------------------------------------------------------
  27.  
  28. Fragment
  29. private MainActivity.OnServiceStateChangedListener stateChangedListener;
  30.  
  31. ...
  32.  
  33. @Override
  34. public void onResume() {
  35.     super.onResume();
  36.  
  37.     MainActivity activity = (MainActivity)getActivity();
  38.     if (activity != null) {
  39.         Log.d(TAG, "Setting stateChangedListener");
  40.         createStateChangedListener();
  41.         activity.setOnStateChangedListener(stateChangedListener);
  42.     } else {
  43.         Log.w(TAG, "Can't set stateChangedListener. Activity is null");
  44.     }
  45. }
  46.  
  47. private void createStateChangedListener() {
  48.     stateChangedListener = new MainActivity.OnServiceStateChangedListener() {
  49.         ...
  50.     }
  51. }
  52.  
  53.  
  54. Log:
  55. D/HomeFragment: Setting stateChangedListener
  56. D/MainActivity: StateChangedListener is set
  57. W/MainActivity: StateChangedListener is null
Advertisement
Add Comment
Please, Sign In to add comment
Advertisement