private void submitPost()

in database/app/src/main/java/com/google/firebase/quickstart/database/java/NewPostFragment.java [56:106]
38 lines of code
4 McCabe index (conditional complexity)

    private void submitPost() {
        final String title = binding.fieldTitle.getText().toString();
        final String body = binding.fieldBody.getText().toString();

        // Title is required
        if (TextUtils.isEmpty(title)) {
            binding.fieldTitle.setError(REQUIRED);
            return;
        }

        // Body is required
        if (TextUtils.isEmpty(body)) {
            binding.fieldBody.setError(REQUIRED);
            return;
        }

        // Disable button so there are no multi-posts
        setEditingEnabled(false);
        Toast.makeText(getContext(), "Posting...", Toast.LENGTH_SHORT).show();

        final String userId = getUid();
        mDatabase.child("users").child(userId).addListenerForSingleValueEvent(
                new ValueEventListener() {
                    @Override
                    public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                        // Get user value
                        User user = dataSnapshot.getValue(User.class);

                        if (user == null) {
                            // User is null, error out
                            Log.e(TAG, "User " + userId + " is unexpectedly null");
                            Toast.makeText(getContext(),
                                    "Error: could not fetch user.",
                                    Toast.LENGTH_SHORT).show();
                        } else {
                            // Write new post
                            writeNewPost(userId, user.username, title, body);
                        }

                        setEditingEnabled(true);
                        NavHostFragment.findNavController(NewPostFragment.this)
                                .navigate(R.id.action_NewPostFragment_to_MainFragment);
                    }

                    @Override
                    public void onCancelled(@NonNull DatabaseError databaseError) {
                        Log.w(TAG, "getUser:onCancelled", databaseError.toException());
                        setEditingEnabled(true);
                    }
                });
    }