ValidatableTextInputLayout

ValidatableTextInputLayout is the view which extended TextInputLayout to validate the input text easily.

Download

Project build.gradle

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

App build.gradle

dependencies {
    ...
    compile 'com.github.Kyash:validatable-textinput-layout:LATEST_VERSION'
}

LATEST_VERSION is which supports AndroidX. If you still use Support Library, please use version 0.3.0.

Basic usage

You can use as same as TextInputLayout in layout xml.

Layout

trigger attribute defines the timing of the text field validation.

<co.kyash.vtl.ValidatableTextInputLayout
  id="@id/first_name"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  app:trigger="text_changed">

  <EditText
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:hint="@string/first_name"
    android:inputType="textPersonName" />

</co.kyash.vtl.ValidatableTextInputLayout>

Kotlin

Register Validator class to ValidatableTextInputLayout For example, RequiredValidator shows error when the field is empty.

private fun initValidator() {
  binding.firstName.register(RequiredValidator(getString(R.string.validation_error_required)))
}

That's it. It works as below.

Triggers

There are 2 types of the validation trigger attributes.

Attribute	Description
text_changed	Validate immediately when the text is changed.
focus_changed	Validate when the focus is changed

Validators

This library provides some common validators

Validator	Description
RequiredValidator
EmailValidator
NumberOnlyValidator	Number only
AsciiOnlyValidator
AlphabetOnlyValidator	Alphabet character only
HiraganaOnlyValidator	Jananese Hieragana character only
KatakanaOnlyValidator	Japanese Katakana character only

Custom validator

You can create the custom validator by using VtlValidator. Since VtlValidator uses RxJava2, it can handle async logic like API as well!

MaterialDesignColorsValidator is example to get data via API and validate the input value.

class MaterialDesignColorsValidator(
        private val api: MaterialDesignColorsApi,
        private val context: Context
) : VtlValidator {

    override fun validateAsCompletable(context: Context, text: String?): Completable {
        return api.all()
                .onErrorResumeNext { Single.error(VtlValidationFailureException(context.getString(R.string.validation_error_server))) }
                .flatMapCompletable { list ->
                    if (text?.trim() != null) {
                        list.filter { it == text.trim().toLowerCase() }
                                .forEach { return@flatMapCompletable Completable.complete() }
                    }
                    return@flatMapCompletable Completable.error(VtlValidationFailureException(getErrorMessage()))
                }
    }

    override fun validate(text: String?): Boolean {
        throw UnsupportedOperationException("Sync method is not arrowed because this validation uses async API response.")
    }

    override fun getErrorMessage(): String {
        return context.getString(R.string.validation_error_colors)
    }
}

Contributing

We are always welcome your contribution! If you find a bug or want to add new feature, please raise issue.

License

Copyright 2018 Kyash

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.