Create an Observable from editing text… here is a solution to the problem.
Create an Observable from editing text
I’m using android data binding (bind) and I want to create an observable object from editing text data so that I can perform operations on it using rxjava.
Here is my code.
XML
<EditText
android:id="@+id/edit_text_username"
android:layout_width="match_parent"
android:addTextChangedListener="@{viewModel.getUsername}"
android:background="@drawable/border_edit_top"
android:drawableLeft="@drawable/ic_person_white_24px"
android:drawablePadding="10dp"
android:drawableStart="@drawable/ic_person_white_24px"
android:hint="@string/username"
android:inputType="text"
android:paddingEnd="10dp"
android:paddingLeft="10dp"
android:paddingRight="10dp"
android:paddingStart="10dp"
app:layout_heightPercent="10%" />
ViewModel class
public TextWatcher getUsername() {
return new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
Log.i("username", s.toString());
}
@Override
public void afterTextChanged(Editable s) {
}
};
}
I
have 3 such edit texts on which I want to use rx java’s combinelatest operator for form validation. In this case, how exactly should I implement RX Java?
Solution
You can use RxBinding.
//Validate username field
Observable<Boolean> usernameObservable = RxTextView.textChanges(usernameEditText)
.map(username -> StringUtils.isNotBlank(username) && Validators.validateUsername(username.toString())).skip(1);
Validate password field
Observable<CharSequence> passwordObservable = RxTextView.textChanges(passwordEditText).skip(1);
Validate confirm password field
Observable<CharSequence> confirmPasswordObservable = RxTextView.textChanges(confirmPasswordEditText)
.skip(1);
Validate password matches field
Observable<Boolean> passwordMatcherObservable = Observable.combineLatest(passwordObservable, confirmPasswordObservable,
(password, confirmPassword) -> password.toString().equals(confirmPassword.toString())).skip(1);
Observable.combineLatest(passwordMatcherObservable, usernameObservable,
(passwordMatch, isUsernameValid) -> passwordMatch && isUsernameValid)
.distinctUntilChanged()
.subscribe(valid -> createAccountBtn.setEnabled(valid));