java - 将输入数据与另一个表进行比较

问题描述

我正在开发的应用程序中有一个注册选项，为了验证谁可以注册，我创建了另一个名为 ORDER 的表。
此表 Order 有两个字段（名称和编号）。
例如：
注册用户名：test 密码：test 名称：用户测试号：12345
订单：名称：用户测试编号：12345
如果名称和号码在表 ORDER 中，它只能在表 USER 中注册注册信息。
你能帮助我吗？
FirebaseDatabase database;
DatabaseReference Users, Order;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);


    database = FirebaseDatabase.getInstance();
    Users = database.getReference("Users");
    Order = database.getReference("Order");

    edtUser =(MaterialEditText) findViewById(R.id.edtUserName);
    edtPassword =(MaterialEditText)findViewById(R.id.edtPassword);

    btnSignIn= (Button)findViewById(R.id.btn_sign_in);
    btnSignUp= (Button)findViewById(R.id.btn_sign_up);

    btnSignUp.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            showSignUpDiaolog();

        }
    });
    btnSignIn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            signIn(edtUser.getText().toString(),edtPassword.getText().toString());
        }
    });
}


private void signIn(final String user, final String pwd) {
    Users.addListenerForSingleValueEvent(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            if(dataSnapshot.child(user).exists())
            {
                if(!user.isEmpty())
                {
                    User login = dataSnapshot.child(user).getValue(User.class);
                    if (login.getPassword().equals(pwd))
                    {
                        Intent homeActivity = new Intent(MainActivity.this,Home.class);
                        Common.currentUser = login;
                        startActivity(homeActivity);
                        finish();
                    }
                    else
                    {
                        Toast.makeText(MainActivity.this, "Password errada!", Toast.LENGTH_SHORT).show();
                    }}
                else
                {
                    Toast.makeText(MainActivity.this, "Introduza o utilizador!", Toast.LENGTH_SHORT).show();
                }
            }
            else
            {
                Toast.makeText(MainActivity.this, "Utilizador não existe!", Toast.LENGTH_SHORT).show();
            }
        }
        @Override
        public void onCancelled(DatabaseError databaseError) {

        }
    });
}

private void showSignUpDiaolog() {
    AlertDialog.Builder alertDialog = new AlertDialog.Builder(MainActivity.this);
    alertDialog.setTitle("Criação da conta:");
    alertDialog.setMessage("Preencher todos os campos!");

    LayoutInflater inflater = this.getLayoutInflater();
    View sign_up_layout = inflater.inflate(R.layout.sign_up_layout,null);

    edtNewUser = (MaterialEditText)sign_up_layout.findViewById(R.id.edtNewUserName);
    edtNewPassword = (MaterialEditText)sign_up_layout.findViewById(R.id.edtNewPassword);
    edtNewOrdem = (MaterialEditText)sign_up_layout.findViewById(R.id.edtNewOrdem);
    edtNewName = (MaterialEditText)sign_up_layout.findViewById(R.id.edtNewName);


    alertDialog.setView(sign_up_layout);
    alertDialog.setIcon(R.drawable.ic_account_circle_black_24dp);
    alertDialog.setNegativeButton("Cancelar", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialogInterface, int i) {
            dialogInterface.dismiss();

        }
    });
    alertDialog.setPositiveButton("Confirmar", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialogInterface, int i) {
            final User user = new User (
                    edtNewUser.getText().toString(),
                    edtNewPassword.getText().toString(),
                    edtNewOrdem.getText().toString(),
                    edtNewName.getText().toString());


                Users.addListenerForSingleValueEvent(new ValueEventListener() {
                @Override
                public void onDataChange(DataSnapshot dataSnapshot)
                {
                    String passwordvalid = edtNewPassword.getText().toString();
                    String usernamevalid = edtNewUser.getText().toString();


                    if (TextUtils.isEmpty(passwordvalid))
                    {
                        Toast.makeText(MainActivity.this, "Password não definida.", Toast.LENGTH_SHORT).show();
                        return;
                    }
                    if (TextUtils.isEmpty(usernamevalid))
                    {
                        Toast.makeText(MainActivity.this, "Utilizador não definido.", Toast.LENGTH_SHORT).show();
                        return;
                    }
                    if (passwordvalid.length() < 8)
                    {
                        Toast.makeText(MainActivity.this, "Password tem que conter no mínimo 8 caracteres.", Toast.LENGTH_SHORT).show();
                        return;
                    }
                    if(dataSnapshot.child(user.getUserName()).exists())
                        Toast.makeText(MainActivity.this, "Utilizador já registado!", Toast.LENGTH_SHORT).show();
                    else
                    {
                        Users.child(user.getUserName())
                                .setValue(user);
                        Toast.makeText(MainActivity.this, "Registo efetuado!", Toast.LENGTH_SHORT).show();
                    }

                }

                @Override
                public void onCancelled(DatabaseError databaseError) {

                }
            });
            dialogInterface.dismiss();

        }
    });
    alertDialog.show();
}
}
标签： javaandroidfirebasefirebase-realtime-database
java - 将输入数据与另一个表进行比较

问题描述

解决方案

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