小编Nul*_*e08的帖子

每当我在登录页面上单击注册按钮时，应用程序崩溃，并且不会继续进行下一个活动。我已经停留了一天，似乎无法在任何地方找到解决方案。

这是我为注册按钮方法编写的代码。（emailText并且passwordText是TextInputLayout）

 public void signup(View view){
        if(!validatePassword()|!validateEmail()){
            return;
        }
        else{
            ref = FirebaseDatabase.getInstance().getReference();
            ref.child("users").child(emailText.getEditText().getText().toString()).addListenerForSingleValueEvent(new ValueEventListener() {
                @Override
                public void onDataChange(DataSnapshot dataSnapshot) {
                    if (dataSnapshot.exists()) {

                        emailText.setError("Username or Email already exists, pick another!");
                    } else {

                            mAuth.createUserWithEmailAndPassword(emailText.getEditText().getText().toString(), passwordText.getEditText().getText().toString())
                                    .addOnCompleteListener(MainActivity.this, new OnCompleteListener<AuthResult>() {
                                        @Override
                                        public void onComplete(@NonNull Task<AuthResult> task) {
                                            if (task.isSuccessful()) {

                                                FirebaseUser user = mAuth.getCurrentUser();

                                                startActivity(intent);
                                            } else {


                                                Toast.makeText(MainActivity.this, "Authentication failed.",
                                                        Toast.LENGTH_SHORT).show();

                                            }


                                        }
                                    });
                            }
                    }

                    @Override
                    public void onCancelled(DatabaseError databaseError) {

                    }
                }); …