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This library makes it easy to work with forms in Android. How many times have you take the text from edittexts or have populated an object to the UI. And how many times have you validated this object and populated the error. With this library you have a comfortable builder interface that allows to easily define and connect your object with the UI. You will be able to retrieve and populate your data saving hundrets of boilerplate code. This library comes too with a annotation-based validation tool. Just annotate your object fields with @NotNull, @MinLength, @Regex(pattern)... and the library will take care of the validation and the error population.


This is an example of how read a big form and save it in a complex object. It is being validated with the AnnotatedValidator. And when the form is fully valid the onFormValid method will be triggered to enable the submission button.

EditText username = (EditText)findViewById(;

EditText password = (EditText)findViewById(;

EditText rpassword = (EditText)findViewById(;

EditText email = (EditText)findViewById(;

 CheckBox terms = (CheckBox)findViewById(;

CheckBox subscribe = (CheckBox)findViewById(;

 CheckBox sport = (CheckBox)findViewById(;

CheckBox cars = (CheckBox)findViewById(;

CheckBox science = (CheckBox)findViewById(;

 final Button submit = (Button)findViewById(;

 final TypedForm<RegisterForm> form =


  .appendField("username", Inputs.newString(username))

  .appendField("password", Inputs.newString(password))

  .appendField("rPassword", Inputs.newString(rpassword))

  .appendField("acceptedTerms", Inputs.newBoolean(terms))

  .appendField("wantSubscribe", Inputs.newBoolean(subscribe))

  .appendField("subscription", GGASection.start()

.appendField("email", Inputs.newString(email))

.appendField("interests", GGASection.start()

  .appendField("likesCars", Inputs.newBoolean(cars))

  .appendField("likesSport", Inputs.newBoolean(sport))

  .appendField("likesScience", Inputs.newBoolean(science))






  .addValidator( AnnotatedValidator.newInstance() )

  .setOnValidListener(new OnValidTypedFormListener<RegisterForm>() {


public void onFormValid(TypedForm<RegisterForm> form, RegisterForm object) {




public void onFormInvalid(TypedForm<RegisterForm> form) {




 submit.setOnClickListener(new View.OnClickListener() {


 public void onClick(View view) {




You can use the library just to populate objects in the UI avoiding boilerplate:

  TextView outUsername = (TextView)findViewById(;

TextView outEmail = (TextView)findViewById(;

 TypedForm<User> outForm = GGAForm.startWithContext(this)

  .appendField("username", Inputs.newString(outUsername))

  .appendField("email", Inputs.newString(outEmail))



You can use the predefined annotations to validate or implement your custom:

public class SimpleLoginForm {

@Regex( key = RegexProvider.EMAIL)
  private String email;

  @MinLength(length = 6)
  private String password;

  private boolean acceptedTermsAndConditions;

  private String associatedProduct;
TypedForm<LoginForm> registerForm = GGAForm.startWithContext(this)

.appendField("email", Inputs.newString(emailEditText))

.appendField("password", Inputs.newString(passwordEditText))

.appendField("acceptedTermsAndConditions", Inputs.newBoolean(termsCheckBox))





  .registerAnnotation(ProductReference.class,new ProductReferenceValidatorProvider())


Like the most comon validation is a Regex validation, you have avaliable the @Regex(key) annotation. With the key you specify wich kind of validator want to use for this field. You have already defined keys in the RegexProvider class, but you can replace this regex or add new custom keys:

Using a defined key:

@Regex( key = RegexProvider.EMAIL ) String email;

Implementing a custom key and using it:

@Regex( key = GITHUB_EMAIL ) String email;


.registerRegex(RegisterForm.GITHUB_EMAIL, "^[a_Z0-9]*$", new ErrorBuilder(){


 public ValidationError build(Object... params) {

  return new ValidationErrorImpl(getString(R.string.validGithubEmail));



Or just replace a existing:


  .replaceRegex(RegexProvider.EMAIL, "^[a_Z0-9]*$");


Add as a dependency to your build.gradle:

dependencies {

  compile 'com.greengrowapps:ggaformsui:0.3' 

Things to develop

This version is still not 1.0, which means api changes could happen. It needs some test and development.

If you want to collaborate, here is a checklist of planned features you can help working on :

  • More validation annotation and validators
  • More tests


Apache License Version 2.0, January 2004
  Copyright 2015 Green Grow Apps SC
  Licensed under the Apache License, Version 2.0 (the "License");

 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at
  Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 See the License for the specific language governing permissions and
 limitations under the License.  


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