How to get Edittext value with databinding?

When you instantiate an ObservableField, the default value is null. When the EditText modifies the value (even if empty), it will be set to a non-null value. However, until then, it is null.

It is easy to fix this by giving your fields a non-null initial value:

public final ObservableField<String> email =  new ObservableField<>("");
public final ObservableField<String> password = new ObservableField<>("");