FormValidator

The easiest, most clean Android form validation.

A declarative Form Validation for Android, simple, clean, and customizable.

Every time you create a form, you need to declare fields and write code for for validating each field in the form, and this results in many if else and a lot of boilerplate. For these reasons FormValidator is here, just declare your fields in XML and its validation and all things will be done for you!

Table of contents

• Usage
• Installation
• Widgets
  • TextView Widgets
  • Other Widgets
• Validatable interface
• Form Layout
• TextView Validation
• Credit
• License

Usage

<com.sha.formvalidator.Form >
    <com.sha.formvalidator.widget.FormEditText 
    	app:validationType="email"
     />
    
    <com.sha.formvalidator.widget.FormCheckBox 
    	app:checkBoxValidation="checked"
     />
    
    <com.sha.formvalidator.widget.FormToggleButton 
    	app:toggleButtonValidation="on"
     />
    
    <com.sha.formvalidator.widget.FormSwitch 
    	app:switchValidation="on"
     />
</com.sha.formvalidator.Form>

To trigger validation:

val isFormValid = findViewById<Form>(R.id.form).validate()

In case you don't need Form, you can use FormEditText just like any regular field and you can trigger validation using:

val isValid = emailFormEditText.validate()

Note

You can nest the fields inside Form layout layout in any levels you need:

<com.sha.formvalidator.Form>
  
    <LinearLayout>
         <RelativeLayout>
                 <com.sha.formvalidator.widget.FormEditText 
                	app:validationType="email"
                  />
          </RelativeLayout>
    </LinearLayout>
</com.sha.formvalidator.Form>

Installation

Gradle:

allprojects {
    repositories {
        ...
        maven { url "https://jitpack.io" }
    }
}

dependencies {
        // Core
        implementation 'com.github.ShabanKamell.FormValidator:core:x.y.z'
        // RxJava
        implementation 'com.github.ShabanKamell:FormValidator:x.y.z'
}

(Please replace x, y and z with the latest version numbers: )

Widgets

FormValidator has a collection of different widgets that implement Validatable. There're TextView widgets and other widgets.

TextView Widgets

Widget	Required attributes	Default
FormEditText	see TextView Validation	-
FormAutoCompleteTextView	see TextView Validation	-

Other Widgets

Widget	Required attributes	Default
FormCheckBox	checkBoxValidation	checked
FormRatingBar	ratingBarValidation	required
FormSeekBar	seekBarValidation	required
FormSwitch	switchValidation	on
FormToggleButton	toggleButtonValidation	on

Validatable interface

Validatable is a fubctional interface implemented by widgets to support validation.

interface Validatable {
    // return true if valid, false otherwise.
    fun validate(): Boolean
}

Form Layout

Form is a LinearLayout that warps all widgets and provides APIs for triggering validation with options.

Declare Form in XML

<com.sha.formvalidator.Form
        ..
        android:id="@+id/form"
        app:shakeOnError="true"
        app:ignoreHiddenFields="true"
        >
    <com.sha.formvalidator.widget.FormEditText 
    	app:validationType="email"
    ... />
    
    <com.sha.formvalidator.widget.FormCheckBox 
    	app:checkBoxValidation="checked"
    ... />
    
    <com.sha.formvalidator.widget.FormToggleButton 
    	app:toggleButtonValidation="on"
    ... />
    
    <com.sha.formvalidator.widget.FormSwitch 
    	app:switchValidation="on"
    ... />
</com.sha.formvalidator.Form>
   

Set options programmatically

form.options = FormOptions.create {
       validationInterceptor = { .. }
       ignoreFieldsIds = listOf(R.id.etIgnoredId)
       ignoreHiddenFields = true
       shakeOnError = true
}

Trigger Validation

val isValid = form.validate()

// OR
form.validateOnClick(btnValidateForm) { isValid -> ..}

TextView Validation

FormValidator contains rich validators for validating TextView. There're are 2 predefined widgets that inherit from TextView: FormEditText and FormAutoCompleteTextView. see full documentation in 👉 👉 TextView Validation

See 'sample' module for the full code.

Credit

Android Form EditText.

🛡 License

click to reveal License

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

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.