小编Shu*_*han的帖子

{
 users:
  {
    apple:
     {
       username :  apple
       email    :  apple@xy.com
       uid      :  tyutyutyu
     }
    mango:
     {
       username :  mango
       email    :  mango@xy.com
       uid      :  erererer
     }
  }
}

如果checkUsername方法返回0,这就是我正在创建的CREATING USER

 if(checkFirebaseForUsername(username)==0) {

                    mAuth.createUserWithEmailAndPassword(email, password)
                            .addOnCompleteListener(SignUpActivity.this, new OnCompleteListener<AuthResult>() {
                                @Override
                                public void onComplete(@NonNull Task<AuthResult> task) {
                                    if (task.isSuccessful()) {

                                        Toast.makeText(getBaseContext(),"inside",Toast.LENGTH_LONG).show();
                                        User newUser = new User();
                                        newUser.setUserId(mAuth.getCurrentUser().getUid());
                                        newUser.setUsername(username);
                                        newUser.setEmailId(email);

                                        try{
                                            mRef.child("users").child(username).setValue(newUser);
                                        }
                                        catch(Exception e){
                                            Toast.makeText(SignUpActivity.this,"error while inserting",Toast.LENGTH_LONG).show();
                                        }
                                        AlertDialog.Builder builder = new AlertDialog.Builder(SignUpActivity.this);
                                        builder.setTitle(R.string.signup_success)
                                                .setPositiveButton(R.string.login_button_label, new DialogInterface.OnClickListener() {

                                                    @Override
                                                    public void …