Android Studio 上的 Firebase (LoginScreen)

Question

So I'm trying to create a login screen for my app in java on Android Studio using Firebase. Currently, in creating accounts, I am doing it this way:

if (password.getText().toString().equals(confirm.getText().toString())) {
    Map map = new HashMap<String, String>();
    map.put(username.getText().toString(), password.getText().toString());
    myFirebaseRef.push().setValue(map);
    error.setText("Account created!");
}
else {
   error.setText("Passwords do not match");
}

But it saves the data on my Firebase like this

So now on my login screen, once a user types in their username, I wanna search my Firebase for the username, and make sure it exists, then see if the password matches what they entered. How Would I do that? Thanks!

Answer 1

As Amy already said: no matter what else you do, immediately change your code to stop storing passwords in plain text . That is an incredibly bad practice. In general authentication is better left to dedicated tools, such as Firebase Authentication .

Aside from that, you'll want to change the way you store the users a bit. It seems you identify users by their name, store them under their name:

Map map = new HashMap<String, String>();
map.put(username.getText().toString(), password.getText().toString());
myFirebaseRef.updateChildren(map);

Now you can look up a user by their name with:

Firebase userRef = myFirebaseRef.child(username.getText().toString());
userRef.addListenerForSingleValueEvent(...

See the Firebase guide on reading data for more on that.