public class Pin extends Observable {

private String mPassword;
private String mConfirmPassword;
 /** Calculated message based on state of instance. */
public int getMessage() {

  if (TextUtils.isEmpty(mPassword) || TextUtils.isEmpty(mConfirmPassword))

 return R.string.msgPasswordPatternFail;

if (mPassword.length() < 4 || mPassword.length() > 6)

 return R.string.msgPasswordPatternFail;

if (mConfirmPassword.length() < 4 || mConfirmPassword.length() > 6)

 return R.string.msgPasswordPatternFail;

return mPassword.equals(mConfirmPassword) ?

R.string.msgPasswordOK :

R.string.msgPasswordFail;

}

 public String getConfirmPassword() {

  return mConfirmPassword;

}

 public void setConfirmPassword(final String confirmPassword) {

  mConfirmPassword = confirmPassword;

setChanged();

  notifyObservers("ConfirmPassword");

}

 public String getPassword() {

  return mPassword;

}

 public void setPassword(final String password) {

  mPassword = password;

setChanged();

  notifyObservers("Password");

}
 
}

import com.artfulbits.binding.*;  import static com.artfulbits.binding.toolbox.Binders.*; import static com.artfulbits.binding.toolbox.Listeners.*; import static com.artfulbits.binding.toolbox.Models.*; import static com.artfulbits.binding.toolbox.Molds.*; import static com.artfulbits.binding.toolbox.Views.*; import static org.hamcrest.core.IsAnything.anything;  /** Login fragment with simplest UI. */ public class PinFragment extends BindingFragment {

 private final Pin mPin = new Pin();

 public PlaceholderFragment() {

}

 @Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

  return inflater.inflate(R.layout.fragment_pin, container, false);

}

 @Override
public void onCreateBinding(final BindingManager bm) {

  /** 
  * EXPLANATION: 
  * - we listen to user input in et_password and et_confirm_password 
  * - during update of the model instance by entered text we expect Observable callbacks 
  * - observable callback force Binding update of UI label - tv_feedback 
  * 
  * USE CASE: 
  * - on wrong password display Error message 
  * - on correct password display OK message, 
  * - Correct pattern: pin contains at least 4 digits and not more than 6 
  */

// do binding only from UI side, only PUSH
  Binders.strings(bm) // <CharSequence - to - String>

.view(editText(getView(), R.id.et_password))

.onView(anyOf(onTextChanged(), onFocusLost()))

.model(pojo(mPin, text("Password")))

.format(onlyPush(fromCharsToString()))

.validate(Matchers.anyOf(blankString(), matchesPattern("[0-9]{
4,6
}
")));

Binders.strings(bm) // <CharSequence - to - String>

.view(editText(getView(), R.id.et_confirm_password))

.onView(anyOf(onTextChanged(), onFocusLost()))

.model(pojo(mPin, text("ConfirmPassword")))

.setTag(R.id.tag_test, "test");

// POP message from model to View only, do that on model state change
  Binders.numeric(bm) // <CharSequence - to - Integer>

.view(textView(getView(), R.id.tv_feedback))

.model(pojo(mPin, integer("Message")))

.onModel(onObservable())

.format(onlyPop(new ToView<CharSequence, Integer>() {

  @Override

  public CharSequence toView(final Integer value) {

 return getString(value);

  
}

}
));

}
 
}