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I want to created a chat app project with android studio and when I want to run my project my app crashed please help me?

My code is below:

private void readUser()
{
    final FirebaseUser firebaseUser = FirebaseAuth.getInstance().getCurrentUser();
    DatabaseReference reference = FirebaseDatabase.getInstance().getReference("Users");

    reference.addValueEventListener(new ValueEventListener()
    {
        @Override
        public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
            if (search.getText().toString().equals("")) {
                mUsers.clear();

                for (DataSnapshot snapshot : dataSnapshot.getChildren()) {
                    User user = snapshot.getValue(User.class);

                    assert user != null;
                    assert firebaseUser != null;

                    if (!user.getId().equalsIgnoreCase(firebaseUser.getUid())) {
                        mUsers.add(user);
                    }
                }
                userAdapter = new UserAdapter(getContext(), mUsers, false);
                recyclerView.setAdapter(userAdapter);
            }
        }
        @Override
        public void onCancelled(@NonNull DatabaseError databaseError)
        {
        }
    });
}

and this is my error:

java.lang.NullPointerException
    at com.example.mahdi.chatapp.Fragments.UsersFragment$3.onDataChange(UsersFragment.java:132)

and error from this line:

if (!user.getId().equalsIgnoreCase(firebaseUser.getUid())) {
Abbas Jafari
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    `user` or `user.getId()` or `firebaseUser` or `firebaseUser.getUid()` is `null`. – luk2302 Mar 13 '19 at 10:41
  • 1
    Have you tried debugging it to see what's throwing the nullpointer? "user" or "firebaseUser" might just be null – DGK Mar 13 '19 at 10:41
  • 1
    try this, https://stackoverflow.com/questions/37773384/android-firebase-cant-get-userid-using-getuid-error-on-null-object-refere – Android Mar 13 '19 at 10:42

0 Answers0